dexa_twice_yearly

TL3 Regular · Calgary, CA

Body composition measurement and its considerable error bars. Two scans a year, same machine, same technician.

Joined 2 October 2024 · last posted 5d · groups: wiki-editors

144 posts, newest first. Showing up to 150.

Seven-day rolling means and why weekly readings mislead Replied, post #88 · Outcomes › Progress reports · 23 Jul 2026 · 26 likes For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.
PIONEER 6 cardiovascular safety, read as a safety trial rather than an efficacy one Replied, post #12 · Compounds › Oral incretins · 20 Jul 2026 · 0 likes Two things before anyone answers the substance. First, the context in the first post is clear and specific. Second, the question is framed so that an answer can…
Prior authorisation: what the criteria usually require — a second dataset Replied, post #43 · Access › Insurance & coverage · 19 Jul 2026 · 0 likes Picking up post #40: that is the part I would want checked first. Formulary status: the list of covered medications and the tier (how much you pay) they are on.…
Packaging that arrived damaged: documenting it properly Replied, post #43 · Sourcing › Logistics · 16 Jul 2026 · 22 likes On post #39 — agreed on the reasoning, with one qualification. Two things before anyone answers the substance. First, the context in the first post is clear and…
Follow-up: Comparing two chromatograms from different laboratories, properly Replied, post #60 · Analytics › HPLC & UHPLC · 14 Jul 2026 · 0 likes Detection wavelength: 214 nm detects the peptide bond and is relatively insensitive to composition. 280 nm detects aromatic residues and is strongly…
How to ask a question when you cannot say why you are asking it Replied, post #38 · Start Here › How to Ask · 12 Jul 2026 · 9 likes Questions you cannot explain: "I cannot say why I am asking this, but is this compound stable at room temperature?" is more productive than no question at all. People…
Revisiting: PCOS and metabolic overlap: what is and is not studied Replied, post #52 · Clinical › Comorbidities · 9 Jul 2026 · 32 likes Interactions between comorbidities: diabetes and kidney disease together change the risk calculation for hypoglycemia and for medication clearance. They are not…
Rewriting my first post: a before-and-after, with commentary — what changed since Replied, post #14 · Start Here › How to Ask · 8 Jul 2026 · 0 likes Questions you cannot explain: "I cannot say why I am asking this, but is this compound stable at room temperature?" is more productive than no question at all. People…
Journal club: STEP 1 and the treatment-policy estimand — does this still hold? Replied, post #53 · Evidence › Journal club · 29 Jun 2026 · 6 likes SURPASS-2 (N Engl J Med 2021): Direct comparison of tirzepatide with semaglutide 1.0 mg. The 1.0 mg dose is not the highest available, which is the central and…
Revisiting: The best-written scientific paper you have read Replied, post #58 · Lounge › Off topic · 28 Jun 2026 · 1 like post #57 answers the question as asked. The question underneath it is different. Politics and public policy: healthcare policy that affects access to these compounds is…
Packaging that arrived damaged: documenting it properly Replied, post #32 · Sourcing › Logistics · 27 Jun 2026 · 6 likes I read post #30 twice before replying, because I had assumed the opposite. Documentation after arrival: photograph the parcel and its contents on arrival. If something…
What published stability data actually covers, and what it does not Replied, post #8 · Practice › Storage & stability · 27 Jun 2026 · 19 likes Freeze-thaw: some peptide solutions tolerate freezing poorly because ice crystals damage protein structure. Whether your specific solution tolerates it depends on the…
Sleep apnoea improving and the equipment implications Replied, post #9 · Wellbeing › Sleep · 26 Jun 2026 · 0 likes Worth separating two things that post #5 runs together. Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down what you did…
Constipation management, with a dietitian's contribution Replied, post #82 · Practice › Side effects · 22 Jun 2026 · 13 likes On post #78 — agreed on the reasoning, with one qualification. Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly…
[2026 update] A vial that will not fully dissolve: what to check and in what order Replied, post #102 · Practice › Reconstitution · 11 Jun 2026 · 13 likes I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The distinction being drawn does not survive when you look at…
Revisiting: The best-written scientific paper you have read Replied, post #25 · Lounge › Off topic · 10 Jun 2026 · 21 likes This follows post #22 rather than contradicting it. Newer drugs and mechanisms: when a new drug launches or a new mechanism is discovered, the Lounge is a place to…
[2026 update] Regional warehouse stock versus direct despatch Replied, post #83 · Sourcing › Logistics · 28 May 2026 · 0 likes Tracking stops updating: tracking last updated days ago usually means the package is in transit and will not update until it reaches the next scanning point. No update…
Transporting a vial for a weekend away — a second dataset Replied, post #62 · Practice › Storage & stability · 24 May 2026 · 33 likes Freeze-thaw: some peptide solutions tolerate freezing poorly because ice crystals damage protein structure. Whether your specific solution tolerates it depends on the…
Revisiting: Can a home kit substitute for a laboratory report? A careful no Replied, post #24 · Analytics › Home & field testing · 23 May 2026 · 9 likes What physical quantity does the device measure? A colorimetric or lateral-flow method typically responds to a class of chemistry rather than to a specific molecule. It…
Peak-to-trough ratio at steady state for a weekly agent — the long version Replied, post #7 · Pharmacology › Pharmacokinetics · 19 May 2026 · 7 likes I read post #5 twice before replying, because I had assumed the opposite. Volume of distribution: the theoretical volume the drug distributes into. For albumin-binding…
The 2.5 mg starting dose is not a therapeutic dose — why that matters Replied, post #130 · Compounds › Tirzepatide · 19 May 2026 · 0 likes Coming back to post #128, because the follow-up matters more than the original answer. Mass and charge states: tirzepatide is about 4813.5 Da and on an electrospray…
Reading a trial's population section before its results Replied, post #30 · Evidence › Trials · 18 May 2026 · 0 likes Risk of bias: structured appraisal of internal validity. Key things to assess: randomisation method (was it truly random or could someone predict the next assignment),…
Transporting a vial for a weekend away — a second dataset Replied, post #53 · Practice › Storage & stability · 14 May 2026 · 21 likes This follows post #50 rather than contradicting it. I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The…
Why retatrutide discussion here is more cautious than elsewhere Replied, post #9 · Compounds › Retatrutide · 29 Apr 2026 · 3 likes Worth separating two things that post #5 runs together. Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather…
Converting between mg/mL and units per dose, both directions — the long version Replied, post #22 · Practice › Reconstitution · 18 Apr 2026 · 25 likes Osmolarity and reconstitution: the osmolarity of the reconstituted solution affects comfort on injection. Isotonic solutions (close to blood osmolarity) are less…
Converting between mg/mL and units per dose, both directions — the long version Replied, post #13 · Practice › Reconstitution · 18 Apr 2026 · 15 likes I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The distinction being drawn does not survive when you look at…
Follow-up: The retatrutide phase 2 obesity paper, read closely Replied, post #9 · Compounds › Retatrutide · 11 Apr 2026 · 0 likes Glucagon receptor agonism seems paradoxical in a weight-loss compound because glucagon raises blood glucose. The paradox resolves because glucagon agonism also…
Spike-and-recover accuracy for a peptide assay Replied, post #37 · Analytics › Method validation · 8 Apr 2026 · 0 likes Limits of detection and quantitation: LOD is the lowest concentration that produces a signal above background. LOQ is the lowest concentration at which the method meets…
Foaming during reconstitution and whether it matters — the long version Replied, post #77 · Practice › Reconstitution · 27 Mar 2026 · 9 likes This follows post #74 rather than contradicting it. I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The…
Grapefruit: why this class is not the class that cares Replied, post #74 · Practice › Interactions · 24 Mar 2026 · 5 likes Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing. The correction was fair and I had…
Introducing myself: pharmacist, sceptic, reluctant participant — one year on Replied, post #36 · Lounge › Introductions · 11 Mar 2026 · 26 likes post #35 answers the question as asked. The question underneath it is different. Ongoing: you can post multiple introductions over time. If you return after a long…
Restarting after a long gap: what the labelling implies — the long version Replied, post #6 · Practice › Dosing & titration · 5 Mar 2026 · 2 likes post #5 answers the question as asked. The question underneath it is different. Steady state means the plasma concentration is stable from dose to dose. That happens…
Reading SURMOUNT-1 without the press release — one year on Replied, post #51 · Compounds › Tirzepatide · 27 Feb 2026 · 26 likes This follows post #48 rather than contradicting it. I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The…
Coming back to: Why a preprint's supplementary material is often the best part Replied, post #3 · Evidence › Preprints · 26 Feb 2026 · 6 likes This follows post #2 rather than contradicting it. Do not build anything on a preprint that you would mind rebuilding: if the preprint later changes substantially in…
Why the timeline is on the right and not the left — what changed since Started this topic · Meta › Site feedback · 24 Feb 2026 · 0 likes Why the timeline is on the right and not the left — what changed since I have a specific reason for asking rather than idle curiosity, and the context is below.…
Seven-day rolling means and why weekly readings mislead — one year on Replied, post #28 · Outcomes › Progress reports · 10 Feb 2026 · 1 like Longitudinal report with the method stated: same scale, same time of day, same conditions. A scale is a tool; use the same one each time. Consistency matters more than…
Price changes over 2025 and 2026, tabulated and dated — does this still hold? Replied, post #82 · Access › Pricing · 6 Feb 2026 · 2 likes This follows post #79 rather than contradicting it. Subscription services and subscriptions: some online clinics bundle compounds into subscription models with…
Packaging that arrived damaged: documenting it properly — a second dataset Replied, post #33 · Sourcing › Logistics · 4 Feb 2026 · 2 likes Coming back to post #31, because the follow-up matters more than the original answer. At what point is a parcel genuinely a problem: if it was despatched weeks ago and…
Coming back to: A community side-effect dataset, with its response rate and biases Replied, post #20 · Data & Tools › Datasets · 29 Jan 2026 · 8 likes This follows post #17 rather than contradicting it. For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add…
Second pass at: Pregnancy and pregnancy planning: contraindication and washout Replied, post #108 · Clinical › Special populations · 26 Jan 2026 · 0 likes Gastroparesis: pre-existing severe delayed gastric emptying can worsen with compounds that slow it further. Discussion with a clinician is prudent if this history exists.
Pre-registering a personal experiment, seriously — a second dataset Replied, post #24 · Research Methods › N-of-1 designs · 24 Jan 2026 · 16 likes When to run an n-of-1: this design works when you want to know whether a treatment works for you, not whether it works in general. For that purpose, it is efficient.
When to stop reading forums, including this one Replied, post #79 · Wellbeing › Mental health · 22 Jan 2026 · 0 likes Support and community: some people process weight change through community (online or in-person). Others prefer privacy. Knowing what you need and seeking it…
Why an oral GLP-1 agonist is a formulation achievement more than a chemistry one — one… Replied, post #10 · Compounds › Oral incretins · 9 Jan 2026 · 0 likes Coming back to post #8, because the follow-up matters more than the original answer. Two things before anyone answers the substance. First, the context in the first…
A 40-week log with the measurement method stated — does this still hold? Replied, post #2 · marked as the solution · Outcomes › Progress reports · 7 Jan 2026 · 7 likes the opening post is right about the mechanism and I think understates the practical bit. Rate of change: reporting progress as "lost 5 kg in 12 weeks" is more useful…
Waist circumference technique and its repeatability Replied, post #35 · Outcomes › Progress reports · 5 Jan 2026 · 20 likes post #34 is right about the mechanism and I think understates the practical bit. Protein intake and resistance training: both self-reported and therefore optimistic in…
Analytical identity of BPC-157: a 15-mer with a simple mass — does this still hold? Replied, post #3 · Compounds › Repair & healing peptides · 4 Jan 2026 · 29 likes For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.
What "verified" means on our vendor pages, stated narrowly Replied, post #29 · Sourcing › Vendor reports · 2 Jan 2026 · 0 likes This follows post #26 rather than contradicting it. Date the report: when the analysis was done matters. Material can degrade in storage. A report from two years ago is…
Warfarin and altered intake: the monitoring argument — the long version Replied, post #81 · Practice › Interactions · 2 Jan 2026 · 0 likes post #80 is right about the mechanism and I think understates the practical bit. Food interactions: most interactions are absorption interactions. Some medications…
Guidelines revision: what changed and why — one year on Replied, post #52 · Meta › Announcements · 30 Dec 2025 · 0 likes RSS: if you prefer to receive announcements by feed rather than visiting the site, RSS is available for this subcategory.
Injection volume, overload, and peak distortion — one year on Started this topic · Analytics › HPLC & UHPLC · 2 Dec 2025 · 57 likes Injection volume, overload, and peak distortion — one year on Writing it up because I had to work it out twice and would rather nobody else did. A documentation…
Second pass at: Robustness: the parameters worth deliberately varying Replied, post #29 · Analytics › Method validation · 28 Nov 2025 · 0 likes post #28 is right about the mechanism and I think understates the practical bit. Forced degradation studies: deliberately stress the material with acid, base, oxidant,…
Reconstitution volumes that produce round numbers, tabulated Replied, post #2 · Practice › Reconstitution · 28 Nov 2025 · 1 like Foaming during reconstitution: bubbles in the solution are usually just air incorporated during mixing. They usually resolve with gentle warming and time. Persistent…
Tracking a preprint to publication: a worked example Replied, post #4 · Evidence › Preprints · 28 Nov 2025 · 13 likes Picking up the opening post: that is the part I would want checked first. Thank you for the correction. I have edited my earlier post with a note rather than silently,…
Pharmaceutical compounding rules, summarised from primary sources — a second dataset Replied, post #52 · Sourcing › Regulatory · 27 Nov 2025 · 1 like Why this category is maintained as documentation, not as recommendations: the goal is factual accuracy and sourcing, not endorsement of any specific regulatory position.
Sequence verification for an obscure compound: how it is done — what changed since Replied, post #90 · Compounds › Other compounds · 26 Nov 2025 · 29 likes Sequence verification: for an obscure compound, a report of the amino acid sequence or a mass-spectrometry result confirming the mass is the only verification that…
Absence of evidence and evidence of absence Replied, post #6 · Research Methods › Statistics · 20 Nov 2025 · 6 likes I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The distinction being drawn does not survive when you look at…
Pen dose counters: what a click does and does not guarantee Replied, post #33 · Devices › Pens & autoinjectors · 14 Nov 2025 · 0 likes Worth separating two things that post #29 runs together. Priming: most pens require priming before the first use (injecting a small amount to fill the needle and line).…
Can a home kit substitute for a laboratory report? A careful no Replied, post #53 · Analytics › Home & field testing · 13 Nov 2025 · 2 likes Two things before anyone answers the substance. First, the context in the first post is clear and specific. Second, the question is framed so that an answer can…
Thyroid function tests during substantial weight change Replied, post #118 · Clinical › Bloodwork · 2 Nov 2025 · 6 likes Analytical imprecision: any measurement has an error margin. A small difference in consecutive tests is usually measurement noise, not a real change. Knowing the…
What pooling buys you and what it destroys Replied, post #50 · Evidence › Meta-analyses · 25 Oct 2025 · 0 likes Subgroup analysis: sometimes a meta-analysis reports separate pooled estimates for different subgroups (e.g., by baseline body mass index or by trial duration). Be…
What happens after your first post: likes, trust levels, and why none of it matters much… Replied, post #101 · Start Here › Welcome · 22 Oct 2025 · 10 likes On the reading order question specifically: start with the how-to-ask materials in this category, then read the one to three subcategories where your main questions…
A 40-week log with the measurement method stated Replied, post #6 · Outcomes › Progress reports · 13 Oct 2025 · 14 likes Exercise volume changes: increasing exercise intensity or duration can mask weight loss (muscle gain) on the scale. Noting exercise changes when reporting weight helps…
Specification in the result column: why that is a meaningful error Replied, post #55 · Analytics › COA interpretation · 8 Oct 2025 · 5 likes Counter-ion form is crucial: peptides are isolated as salts, most often trifluoroacetate from reversed-phase purification or acetate after salt exchange. The…
"Greater than or equal to 99%" as a specification rather than a result Replied, post #45 · Analytics › COA interpretation · 2 Oct 2025 · 17 likes When method identifiers are missing: "reversed-phase HPLC" is less specific than "reversed-phase HPLC at 214 nm on a C18 column with a 10 to 40% acetonitrile gradient…
Second pass at: How to ask a question when you cannot say why you are asking it Replied, post #18 · Start Here › How to Ask · 27 Sep 2025 · 1 like Lab result questions: state the result, the reference interval, and what else is on the same panel. A single flag on a single draw is usually uninformative without…
[2026 update] A single out-of-range value on an otherwise normal panel Replied, post #12 · Clinical › Bloodwork · 25 Sep 2025 · 10 likes post #11 answers the question as asked. The question underneath it is different. Analytical imprecision: any measurement has an error margin. A small difference in…
Tracking that stops updating and then resumes Replied, post #29 · Sourcing › Logistics · 23 Sep 2025 · 18 likes post #28 is right about the mechanism and I think understates the practical bit. For anyone arriving from a search: the marked solution above is the direct answer, and…
A parcel that arrived warm: a decision process, not a verdict Replied, post #48 · Practice › Storage & stability · 21 Sep 2025 · 3 likes post #47 answers the question as asked. The question underneath it is different. Freeze-thaw: some peptide solutions tolerate freezing poorly because ice crystals…
"Greater than or equal to 99%" as a specification rather than a result Replied, post #34 · Analytics › COA interpretation · 12 Sep 2025 · 17 likes Worth separating two things that post #30 runs together. Amino acid analysis gives content: it hydrolyses the peptide and quantifies the residues. It measures the…
Aggregated purity results across four services, with caveats — a second dataset Replied, post #44 · Data & Tools › Datasets · 8 Sep 2025 · 0 likes Using data in discussions: datasets are useful as reference points when someone claims something unusual. "I have not seen that reported in the data" is different from…
Aggregated purity results across four services, with caveats — a second dataset Replied, post #13 · Data & Tools › Datasets · 6 Sep 2025 · 8 likes Bias toward positive outcomes: datasets collected by members are biased toward people who found the compounds useful. People who did not respond do not return. People…
Which panel is worth repeating and which is worth ignoring Replied, post #101 · Clinical › Bloodwork · 3 Sep 2025 · 7 likes This follows post #98 rather than contradicting it. Thank you for the correction. I have edited my earlier post with a note rather than silently, so the thread still…
Follow-up: Journal club: orforglipron phase 2 and the non-peptide question Replied, post #50 · Evidence › Journal club · 26 Aug 2025 · 1 like On post #46 — agreed on the reasoning, with one qualification. Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down what…
Why "add 2 mL" is not an instruction — a second dataset Replied, post #3 · Practice › Reconstitution · 23 Aug 2025 · 16 likes This follows post #2 rather than contradicting it. Thank you for the correction. I have edited my earlier post with a note rather than silently, so the thread still…
Revisiting: GLP-1 receptor distribution: central and peripheral Replied, post #27 · Pharmacology › Receptor biology · 14 Aug 2025 · 2 likes On post #23 — agreed on the reasoning, with one qualification. Central versus peripheral action: GLP-1 agonism works through both central nervous system effects…
Asking about a compound your prescriber has not heard of Replied, post #121 · Clinical › Prescriber conversations · 10 Aug 2025 · 32 likes Asking about monitoring: understand what lab work will be done, how often, and what you will be monitored for. A plan is better than ad-hoc monitoring.
How to research a compound with no human data without deceiving yourself Replied, post #30 · Compounds › Other compounds · 31 Jul 2025 · 10 likes Melanocortin agonists: mechanism involves the melanocortin-4 receptor pathway that regulates appetite. The documented adverse profile includes blood pressure elevation…
Second pass at: Why this subcategory is stricter about sourcing than most Replied, post #18 · Compounds › Secretagogues & GH axis · 28 Jul 2025 · 0 likes IGF-1 as a surrogate: it is a better integrated measure than a spot growth hormone level and it is still a surrogate, with all the caveats that come with surrogates.…
Why semaglutide solutions can look faintly opalescent and when that matters Replied, post #4 · Compounds › Semaglutide · 28 Jul 2025 · 0 likes the opening post answers the question as asked. The question underneath it is different. Albumin binding is not a unique structural feature and nothing in the class…
Coming back to: The SOUL trial and oral semaglutide cardiovascular outcomes Replied, post #21 · Compounds › Oral incretins · 26 Jul 2025 · 12 likes PIONEER programme is phase 3 for oral semaglutide. The trials cover multiple indications and durations. Reading them requires attention to which trial is which because…
Escalating every six weeks instead of four: what I observed over eight months — one year… Replied, post #44 · Practice › Dosing & titration · 25 Jul 2025 · 4 likes The arithmetic of an intermediate dose: if the label says 1.0 mg and 2.0 mg, a dose strictly between them is off-label by definition. Some people compute it anyway. The…
A calculator that gives a right answer to the wrong question — does this still hold? Replied, post #2 · Data & Tools › Calculators · 23 Jul 2025 · 30 likes The calculators maintained on this site are open-source and verifiable. They are intended to check arithmetic, not to replace medical judgement. Using them is optional…
Are there stupid questions here? A staff answer, at length Replied, post #7 · Start Here › Welcome · 23 Jul 2025 · 0 likes Coming back to post #5, because the follow-up matters more than the original answer. Welcome. The orientation materials are pinned at the top of this category and they…
Older adults, sarcopenia risk, and the trade-off nobody quantifies — the long version Replied, post #2 · Clinical › Special populations · 20 Jul 2025 · 0 likes Disordered eating history: a history of anorexia nervosa, bulimia, or other eating disorders changes the risk-benefit calculation because appetite suppression might…
Reconstituting a multi-strength kit without mixing yourself up Replied, post #100 · Practice › Reconstitution · 14 Jul 2025 · 3 likes Foaming during reconstitution: bubbles in the solution are usually just air incorporated during mixing. They usually resolve with gentle warming and time. Persistent…
Coming back to: Why semaglutide solutions can look faintly opalescent and when that… Replied, post #15 · Compounds › Semaglutide · 3 Jul 2025 · 0 likes On post #11 — agreed on the reasoning, with one qualification. Gastric emptying delay is the mechanism behind most of the gastrointestinal side effects. Slowing the…
A comparison of home results against a laboratory result on the same vial Replied, post #10 · Analytics › Home & field testing · 1 Jul 2025 · 11 likes Lateral-flow devices: like a rapid COVID test. They have a reagent strip and produce a colour result. They are quick but not precise and not intended for quantitative…
Coming back to: What published stability data actually covers, and what it does not Replied, post #73 · Practice › Storage & stability · 27 Jun 2025 · 4 likes This follows post #70 rather than contradicting it. Beyond-use dating: the date after which a prepared solution should not be used. It is an estimate based on how fast…
Follow-up: The decimal-point error, and the habit that catches it Replied, post #12 · Practice › Reconstitution · 15 Jun 2025 · 3 likes For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.
Follow-up: Tracking intake honestly when appetite is absent Replied, post #80 · Nutrition & Training › Protein & intake · 13 Jun 2025 · 0 likes I read post #78 twice before replying, because I had assumed the opposite. Protein targets during weight loss: the standard recommendation is 1.6 to 2.2 grams per…
[2026 update] An appeal that failed, and what I would do differently Replied, post #94 · Access › Insurance & coverage · 13 Jun 2025 · 14 likes post #93 answers the question as asked. The question underneath it is different. Thank you for the correction. I have edited my earlier post with a note rather than…
[2026 update] An appeal that failed, and what I would do differently Replied, post #83 · Access › Insurance & coverage · 12 Jun 2025 · 1 like Documentation your clinician can provide: letters from clinicians describing why standard treatments have failed or are contraindicated are often exactly what an…
Coming back to: Getting a referral rather than a refusal Replied, post #50 · Clinical › Prescriber conversations · 9 Jun 2025 · 1 like Worth separating two things that post #46 runs together. Prescription logistics: confirm whether it will be filled locally, requires mail order, or will be prescribed…
IGF-1 as a surrogate endpoint and its limitations — the long version Replied, post #7 · marked as the solution · Compounds › Secretagogues & GH axis · 8 Jun 2025 · 6 likes post #6 is right about the mechanism and I think understates the practical bit. Pulsatile secretion matters because growth hormone is secreted in pulses, not…
Revisiting: GLP-1 receptor distribution: central and peripheral Replied, post #3 · Pharmacology › Receptor biology · 30 May 2025 · 0 likes Bias and desensitisation: receptors can be biased (preferentially activating some downstream pathways over others) and can desensitise over time (responding less to the…
Pre-registering a personal experiment, seriously Replied, post #49 · Research Methods › N-of-1 designs · 30 May 2025 · 6 likes Washout periods: after stopping a medication, how long does it take for the effect to wash out? For compounds with a week-long half-life, roughly a month is needed to…
Publishing an inconvenient result: a case study Replied, post #25 · Sourcing › Independent verification · 26 May 2025 · 10 likes post #24 is right about the mechanism and I think understates the practical bit. Blind sampling: submitting without the laboratory or seller knowing the source removes…
DXA precision and the least significant change for lean mass — the long version Replied, post #67 · Outcomes › Body composition · 20 May 2025 · 1 like This follows post #64 rather than contradicting it. I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The…
Follow-up: Tesamorelin has an approved indication — what that changes about the evidence Replied, post #62 · Compounds › Secretagogues & GH axis · 14 May 2025 · 2 likes Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing. The correction was fair and I had…
Hepatic steatosis: what the MASH trial evidence supports Replied, post #38 · Clinical › Comorbidities · 12 May 2025 · 31 likes Coming back to post #36, because the follow-up matters more than the original answer. Type 2 diabetes: the population with the largest evidence base for these…
Follow-up: What other technical communities get right that we do not Replied, post #93 · Lounge › Off topic · 10 May 2025 · 3 likes Adjacent and interesting: you might post something about nutrition, bioavailability from a food perspective, or the sociology of weight. Adjacent to this community's…
A newcomer's list of things that confused me, and the fixes Replied, post #10 · Start Here › Welcome · 8 May 2025 · 0 likes Picking up post #7: that is the part I would want checked first. The FAQ link in the sidebar is maintained and worth ten hours of forum browsing. It is not…
Follow-up: History of disordered eating and why it changes the conversation Replied, post #6 · Clinical › Special populations · 8 May 2025 · 7 likes Two things before anyone answers the substance. First, the context in the first post is clear and specific. Second, the question is framed so that an answer can…
Follow-up: Documentation that appears only after payment Replied, post #33 · Sourcing › Red flags · 30 Apr 2025 · 22 likes I read post #31 twice before replying, because I had assumed the opposite. Pricing patterns: unusually low prices for what are otherwise consistent with market rates…
Validating a calculator against hand arithmetic — what changed since Replied, post #33 · Data & Tools › Calculators · 25 Apr 2025 · 0 likes Precision and significant figures: the calculators do not round to match your input precision. If you input values to one decimal place, the output might have more. Use…
A 5 mg vial and a 0.25 mg dose: the arithmetic in full — what changed since Replied, post #53 · Practice › Reconstitution · 19 Apr 2025 · 1 like Worth separating two things that post #49 runs together. Why "add 2 mL" is not an instruction: the powder in the vial takes up space. "Add 2 mL to a 10 mL vial" and…
Carryover and the ghost peak from last week's standard Replied, post #75 · Analytics › HPLC & UHPLC · 10 Apr 2025 · 0 likes Method validation is the demonstration that a method can separate the compound from its degradation products and impurities reliably. A method that cannot resolve an…
Coming back to: Sample size calculations, read backwards from the published number Replied, post #10 · Evidence › Trials · 8 Apr 2025 · 0 likes I read post #8 twice before replying, because I had assumed the opposite. Confounding in observational data: a third variable can explain an apparent association. In a…
Retatrutide dose escalation in the published trials Replied, post #83 · Compounds › Retatrutide · 3 Apr 2025 · 13 likes Picking up post #80: that is the part I would want checked first. Phase 2 sample sizes are not adequate for safety characterisation of a novel triple agonist. Phase 3…
Scheduled maintenance and what will be unavailable Replied, post #95 · Meta › Announcements · 2 Apr 2025 · 1 like Implementation timeline: announcements include when a change takes effect. Marking the date helps you know whether the change is already in effect.
Counter-ion form: the field almost nobody reports — one year on Replied, post #135 · Analytics › COA interpretation · 28 Mar 2025 · 20 likes This follows post #132 rather than contradicting it. I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The…
Publishing an inconvenient result: a case study Replied, post #2 · Sourcing › Independent verification · 25 Mar 2025 · 20 likes I read the opening post twice before replying, because I had assumed the opposite. VendorInvestigate: documentation and supplier-practice review. Reviews paperwork…
Journal club: STEP 4 and what a withdrawal design can prove — one year on Replied, post #49 · Evidence › Journal club · 24 Mar 2025 · 0 likes Critical appraisal template: (1) What did the trial set out to estimate? (2) Could the design answer that question? (3) Was the population sufficiently similar to your…
Second pass at: Cross-border purchase within the EU: the actual rules Replied, post #97 · Access › International · 13 Mar 2025 · 0 likes Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down what you did and when. The single most useful thing in your own…
When to suspect the method rather than the sample Replied, post #96 · Analytics › Method validation · 12 Mar 2025 · 0 likes This follows post #93 rather than contradicting it. Accuracy: the method measures what you intend to measure. For purity methods, this is tested by spike-and-recover…
A 5 mg vial and a 0.25 mg dose: the arithmetic in full — what changed since Replied, post #17 · Practice › Reconstitution · 15 Feb 2025 · 2 likes Why "add 2 mL" is not an instruction: the powder in the vial takes up space. "Add 2 mL to a 10 mL vial" and "add 2 mL of diluent so the final volume is approximately 2…
Second pass at: A history of disordered eating: proceeding carefully Replied, post #3 · Wellbeing › Mental health · 4 Feb 2025 · 13 likes Disordered eating history: a history of anorexia, bulimia, or other eating disorders changes the risk-benefit calculation. Appetite suppression might trigger relapse.…
About the Pricing category Replied, post #4 · Access › Pricing · 4 Feb 2025 · 0 likes Suggestion for the wiki post above: it would be worth linking the two or three most-referenced topics in this category directly, since new members reliably ask for…
Protein density versus volume when you cannot eat much Replied, post #33 · Nutrition & Training › Protein & intake · 29 Jan 2025 · 20 likes Two things before anyone answers the substance. First, the context in the first post is clear and specific. Second, the question is framed so that an answer can…
Escalating every six weeks instead of four: what I observed over eight months Replied, post #20 · Practice › Dosing & titration · 15 Jan 2025 · 3 likes Dose equivalence between different incretin analogues is a weak concept. The molecules differ in structure, half-life, receptor selectivity, and in what has been…
Second pass at: Historical amylin analogues and what happened to them Replied, post #12 · Compounds › Cagrilintide & amylin analogues · 15 Jan 2025 · 6 likes Gastric emptying: both amylin and GLP-1 slow it, through partly overlapping but distinct mechanisms. Whether the slowing at a higher magnitude produces disproportionate…
Isotonicity and what happens when you get it wrong Replied, post #18 · Pharmacology › Formulation chemistry · 5 Jan 2025 · 31 likes This follows post #15 rather than contradicting it. Fill volume and headspace: the amount of solution in a vial and the air above it affect how much the solution is…
Dose numbers for oral formulations are not comparable to injectable ones — a second… Replied, post #15 · Compounds › Oral incretins · 2 Jan 2025 · 0 likes SNAC is the sodium N-(8-[2-hydroxybenzoyl]amino) caprylate, an absorption enhancer that transiently raises local pH in the stomach and promotes gastric mucosal…
What we do not know about retatrutide, listed explicitly Replied, post #32 · Compounds › Retatrutide · 25 Dec 2024 · 0 likes Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down what you did and when. The single most useful thing in your own…
Body image changing more slowly than the body Replied, post #124 · Wellbeing › Mental health · 24 Dec 2024 · 9 likes Coming back to post #122, because the follow-up matters more than the original answer. Social and relationship impacts: weight change affects how others perceive and…
[2026 update] Step therapy requirements and how to satisfy them Replied, post #85 · Access › Insurance & coverage · 24 Dec 2024 · 2 likes Coming back to post #83, because the follow-up matters more than the original answer. Having read the exchange above, I think I was wrong earlier in this topic and I…
Criticising the method without criticising the authors Replied, post #25 · Evidence › Study critique · 19 Dec 2024 · 1 like Defending a paper against criticism: if the authors respond, they might clarify something the paper explained poorly. Their response might also miss your point. Either…
Meeting a protein target on a suppressed appetite — does this still hold? Replied, post #59 · Nutrition & Training › Protein & intake · 15 Dec 2024 · 0 likes Worth separating two things that post #55 runs together. Liquid versus solid: protein in liquid form (shakes) is easier to consume in volume but might not be as…
Revisiting: Moderation log format change Replied, post #62 · Meta › Announcements · 10 Dec 2024 · 1 like Questions welcomed: if an announcement is unclear, asking for clarification is welcome. Staff will explain their reasoning.
Why "any advice?" is the least effective ending for a post Replied, post #97 · Start Here › How to Ask · 2 Dec 2024 · 10 likes Units. Everything needs units. This is why we ask every single time. I have seen the same arithmetic done three different ways depending on whether the person was…
Second pass at: A field-by-field walk through a certificate of analysis Replied, post #137 · Analytics › COA interpretation · 2 Dec 2024 · 14 likes Coming back to post #135, because the follow-up matters more than the original answer. Practical note that does not fit anywhere else. Whatever you conclude from this…
How to ask for a dose change without antagonising anyone — what changed since Replied, post #41 · Clinical › Prescriber conversations · 8 Nov 2024 · 18 likes Asking about monitoring: understand what lab work will be done, how often, and what you will be monitored for. A plan is better than ad-hoc monitoring.
Time to steady state after a dose increase Replied, post #146 · Pharmacology › Pharmacokinetics · 6 Nov 2024 · 19 likes Hepatic metabolism: the degree to which each compound is hepatically metabolised versus renally cleared is known but varies. Severe liver disease changes clearance.
Second pass at: A field-by-field walk through a certificate of analysis Replied, post #102 · Analytics › COA interpretation · 31 Oct 2024 · 4 likes On post #98 — agreed on the reasoning, with one qualification. When a document puts the specification in the result column, it has told you the release criterion, not…
Hypertension improvement and when medication needs revisiting — a second dataset Replied, post #5 · Clinical › Comorbidities · 8 Oct 2024 · 10 likes post #4 answers the question as asked. The question underneath it is different. Thank you for the correction. I have edited my earlier post with a note rather than…
Criticising the method without criticising the authors Replied, post #9 · Evidence › Study critique · 6 Oct 2024 · 6 likes On post #5 — agreed on the reasoning, with one qualification. Two things before anyone answers the substance. First, the context in the first post is clear and…
Coming back to: Grapefruit: why this class is not the class that cares Replied, post #12 · Practice › Interactions · 29 Sep 2024 · 23 likes This follows post #9 rather than contradicting it. For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add…
What a stability-indicating method is and how you demonstrate one — one year on Replied, post #29 · Analytics › Method validation · 8 Sep 2024 · 0 likes Worth separating two things that post #25 runs together. Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather…
Circumference measurements as a poor man's composition estimate Replied, post #113 · Outcomes › Body composition · 31 Aug 2024 · 11 likes post #112 answers the question as asked. The question underneath it is different. For anyone arriving from a search: the marked solution above is the direct answer, and…
Splitting a vial for two laboratories: how to do it without ruining both — what changed… Replied, post #25 · Sourcing › Independent verification · 30 Aug 2024 · 8 likes Picking up post #22: that is the part I would want checked first. Interpreting a result: a purity figure is one measurement on one vial on one day. Agreement across two…
Promotion criteria, and the one that stops most nominations Replied, post #45 · Documentation › Doc review · 24 Aug 2024 · 0 likes Citation checking: if a maintained page cites a paper, the citation should match what the paper actually says. If you notice a mismatch, post it here.
Circumference measurements as a poor man's composition estimate Replied, post #50 · Outcomes › Body composition · 8 Aug 2024 · 0 likes Ultrasound: thickness of subcutaneous fat at specific sites. Less standardised than DXA and operator-dependent. Useful as a supplementary measure but not as a primary…
Cold packs, phase-change material, and what survives ten days Replied, post #111 · Sourcing › Logistics · 16 Jul 2024 · 14 likes Packaging integrity on arrival: if a parcel arrives with compromised packaging, that is evidence of a handling problem in transit. The contents may or may not be…
Assessing a warm arrival: the decision process — one year on Replied, post #102 · Sourcing › Logistics · 1 Jun 2024 · 0 likes Worth separating two things that post #98 runs together. Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather…