d.eriksen
TL2 Moderator · Aalborg
Contributes reviews on supplier material. Based in Aalborg.
Joined 17 June 2025 · last posted 3d
76 posts, newest first. Showing up to 150.
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Named, unnamed and unspecified impurities as regulatory categories — the long version Replied, post #112 · Analytics › Impurities & related substances · 25 Jul 2026 · 4 likes Dimer and higher-order multimers: two or more peptide molecules bonded together. They appear at double the mass and higher. They may or may not separate from the…
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Asking a follow-up: new topic or new reply? Replied, post #65 · Start Here › How to Ask · 22 Jul 2026 · 8 likes Thank you for the correction. I have edited my earlier post with a note rather than silently, so the thread still makes sense to read. The error was mine and it was the…
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What consumer-accessible tests can and cannot determine — a second dataset Replied, post #109 · Analytics › Home & field testing · 21 Jul 2026 · 0 likes Thank you for the correction. I have edited my earlier post with a note rather than silently, so the thread still makes sense to read. The error was mine and it was the…
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Follow-up: Prior authorisation: what the criteria usually require Replied, post #74 · Access › Insurance & coverage · 14 Jul 2026 · 1 like Appeals process: unemotional prose, the criterion quoted verbatim, evidence mapped to it point by point, dates, and nothing else. Describing how the decision affected…
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Journal club: indirect comparison between two programmes, defended and attacked Replied, post #114 · Evidence › Journal club · 11 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.
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Batch numbers that do not match the vial label Replied, post #41 · Sourcing › Red flags · 10 Jul 2026 · 26 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…
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Request: a per-category review queue Replied, post #82 · Meta › Feature requests · 5 Jul 2026 · 0 likes Picking up post #79: that is the part I would want checked first. Tracking: staff will update the status of feature requests (under consideration, planned, implemented,…
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What I would want from a home test that does not exist yet — what changed since Replied, post #79 · Analytics › Home & field testing · 3 Jul 2026 · 24 likes Enzyme assays: if you have an enzyme that reacts specifically with your compound, an enzyme-based assay can work. These are sometimes available commercially but are…
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Washout with a one-week half-life: the arithmetic — does this still hold? Replied, post #34 · Research Methods › N-of-1 designs · 29 Jun 2026 · 12 likes This follows post #31 rather than contradicting it. Designing a personal experiment that could actually change your mind: that is the standard for an n-of-1 design. An…
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A widely repeated interaction claim that turns out to be unsupported — what changed since Replied, post #68 · Practice › Interactions · 20 Jun 2026 · 3 likes Insulin interaction: semaglutide and tirzepatide are not contraindicated with insulin but the combination carries hypoglycemia risk if insulin doses are not adjusted.…
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Reference intervals: how they are constructed and why one in twenty flags Replied, post #115 · Clinical › Bloodwork · 15 Jun 2026 · 0 likes On post #111 — agreed on the reasoning, with one qualification. Biological variation: the person-to-person variation in a biomarker for a healthy person is larger than…
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Micronutrient adequacy at low total intake Replied, post #86 · Nutrition & Training › Protein & intake · 13 Jun 2026 · 30 likes Leucine and MPS: leucine stimulates muscle protein synthesis at a threshold of roughly 2 to 3 grams per meal. That influences how much protein per meal matters, but…
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Comparing prices across jurisdictions without misleading yourself Replied, post #63 · Access › Pricing · 10 Jun 2026 · 0 likes Worth separating two things that post #59 runs together. Subscription services and subscriptions: some online clinics bundle compounds into subscription models with…
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An appeal that succeeded, with the letter structure — the long version Replied, post #35 · Access › Insurance & coverage · 31 May 2026 · 2 likes Thank you for the correction. I have edited my earlier post with a note rather than silently, so the thread still makes sense to read. The error was mine and it was the…
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Second pass at: Metformin co-administration and additive GI effects Replied, post #111 · Practice › Interactions · 24 May 2026 · 0 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.
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Injection volume, overload, and peak distortion Replied, post #17 · Analytics › HPLC & UHPLC · 23 May 2026 · 22 likes On integration: where the baseline is drawn matters more than most people realise. On a clean chromatogram with well-resolved peaks the choice is inconsequential. On a…
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An appeal that succeeded, with the letter structure — the long version Replied, post #6 · Access › Insurance & coverage · 22 May 2026 · 4 likes Formulary status: the list of covered medications and the tier (how much you pay) they are on. Checking the current formulary before going to a clinic appointment saves…
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Rewriting my first post: a before-and-after, with commentary — what changed since Replied, post #2 · Start Here › How to Ask · 21 May 2026 · 1 like On the opening post — agreed on the reasoning, with one qualification. Two things before anyone answers the substance. First, the context in the first post is clear and…
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Alcohol: what is documented and what is folklore Replied, post #6 · Practice › Interactions · 8 May 2026 · 32 likes On post #2 — agreed on the reasoning, with one qualification. Separation timing versus clinically important interaction: a separation timing inconvenience (taking one…
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Insomnia at a dose step: reported experiences — the long version Replied, post #19 · Wellbeing › Sleep · 7 May 2026 · 5 likes post #18 answers the question as asked. The question underneath it is different. Sleep hygiene: basics (cool dark room, consistent sleep time, no screens before bed)…
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Request: show the solution author in the topic list — what changed since Replied, post #18 · Meta › Feature requests · 1 May 2026 · 8 likes Worth separating two things that post #14 runs together. Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down what you did…
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Prescription requirements and telehealth models — a second dataset Replied, post #7 · Sourcing › Regulatory · 20 Apr 2026 · 17 likes Labelling and intended use: a compound sold as "research-use-only" does not change its pharmacology if ingested. It changes the legal status of the sale. The labelling…
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Blind submission and why it changes minds — the long version Replied, post #23 · Sourcing › Independent verification · 14 Apr 2026 · 25 likes Blind sampling: submitting without the laboratory or seller knowing the source removes the two easiest ways for a result to be shaped: selective submission and…
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Semaglutide and gastric emptying — the mechanism behind most of the side-effect profile Started this topic · Compounds › Semaglutide · 13 Apr 2026 · 0 likes Posting this under the heading it deserves: Semaglutide and gastric emptying — the mechanism behind most of the side-effect profile Everything below is what sits behind…
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Prediction intervals and why they are more honest than confidence intervals Replied, post #18 · Evidence › Meta-analyses · 8 Apr 2026 · 1 like post #17 is right about the mechanism and I think understates the practical bit. Why forest plots are more informative than pooled numbers: they show the variation…
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Liver enzymes drifting down and what that usually means Replied, post #61 · Clinical › Bloodwork · 27 Feb 2026 · 0 likes TSH and free hormones: TSH is a reasonable screening test but does not tell you about actual free hormone levels. If TSH is abnormal, free thyroid hormones confirm…
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Reconstitution volumes that produce round numbers, tabulated Replied, post #54 · Practice › Reconstitution · 26 Feb 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…
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GLP-1 receptor distribution: central and peripheral Replied, post #8 · Pharmacology › Receptor biology · 25 Feb 2026 · 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…
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A parcel stationary at a customs facility for nine days Replied, post #32 · Sourcing › Logistics · 23 Feb 2026 · 20 likes This follows post #29 rather than contradicting it. Reshipment after seizure: if a parcel is seized, some suppliers will reship; others will not. That is a supplier…
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[2026 update] A rising related-substance total over six months: degradation or method… Replied, post #18 · Analytics › Impurities & related substances · 11 Feb 2026 · 30 likes Worth separating two things that post #14 runs together. Disulfide formation: if a peptide contains cysteine, it can form disulfide bonds with itself or with other…
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Micro-titration: a disputed topic, argued properly Replied, post #25 · Practice › Dosing & titration · 21 Jan 2026 · 21 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…
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Whether protein timing matters at a large deficit Replied, post #15 · Nutrition & Training › Protein & intake · 9 Jan 2026 · 27 likes Meeting protein targets on suppressed appetite: this is where the practical difficulty lies. Eating more protein when appetite is suppressed is genuinely hard.…
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Run-in periods and the population they select Replied, post #42 · Evidence › Trials · 29 Dec 2025 · 0 likes Generalisability: the enrolled population was selected in ways that matter. Entry criteria, run-in periods, and the simple fact that people who agree to a multi-year…
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DXA precision and the least significant change for lean mass Replied, post #26 · Outcomes › Body composition · 28 Nov 2025 · 1 like DXA (dual-energy X-ray absorptiometry): the standard for body composition in research. Precision is roughly ±1 kg for lean mass. Two scans six months apart on the same…
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Second pass at: Programming during a large energy deficit Replied, post #98 · Nutrition & Training › Resistance training · 26 Nov 2025 · 24 likes This follows post #95 rather than contradicting it. I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The…
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Tirzepatide's shorter half-life and its one practical consequence Replied, post #11 · Compounds › Tirzepatide · 24 Nov 2025 · 29 likes Storage and stability: published data on licensed tirzepatide formulations exists and is worth reading directly rather than through summarised claims. Reconstituted…
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Dead volume across syringe and needle combinations Replied, post #22 · Devices › Syringes & needles · 10 Nov 2025 · 0 likes On post #18 — agreed on the reasoning, with one qualification. Sharps disposal: needles and syringes should be disposed in a sharps container (a rigid,…
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[2026 update] What steady state means for the decision to escalate Replied, post #2 · Practice › Dosing & titration · 3 Nov 2025 · 7 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…
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Why an oral GLP-1 agonist is a formulation achievement more than a chemistry one Replied, post #16 · Compounds › Oral incretins · 24 Oct 2025 · 13 likes Dose numbers for oral formulations are not comparable to injectable ones. The 14 mg oral dose is not equivalent to any injectable dose in the traditional comparison…
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[2026 update] Long-time reader, first-time poster Replied, post #18 · Lounge › Introductions · 17 Oct 2025 · 0 likes Say hello. No question required. Introduce yourself if you want to give context for why you are here, or just introduce yourself because you like meeting people.
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A preprint whose numbers changed substantially at publication Replied, post #92 · Evidence › Preprints · 15 Oct 2025 · 18 likes Preprints for speed: some important preliminary findings are posted as preprints to disseminate quickly. That speed is useful but comes at the cost of not yet having…
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Compounds this community declines to help with, and why Replied, post #76 · Compounds › Other compounds · 7 Oct 2025 · 32 likes Research-use-only status is a legal classification, not a safety classification. It means the compound is sold for laboratory use and not for human consumption or…
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Angle of injection and whether 90 degrees is always right Replied, post #31 · Practice › Administration · 5 Oct 2025 · 11 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…
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Availability by country, dated, with primary sources Replied, post #8 · Access › International · 2 Oct 2025 · 11 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…
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The nausea timeline across the first four weeks, with a tabulated log Replied, post #109 · Practice › Side effects · 1 Oct 2025 · 0 likes This follows post #106 rather than contradicting it. Constipation: common, manageable, and frequently under-reported because it is not dramatic. Increasing fibre and…
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Citing a preprint in a maintained document: our rule and its reasoning — does this still… Replied, post #27 · Evidence › Preprints · 27 Sep 2025 · 18 likes Check whether it was later published: searching for the preprint's first author and keywords in PubMed might find a published version. The published version is the…
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Pinch or no pinch, and how needle length changes the answer Replied, post #40 · Practice › Administration · 30 Aug 2025 · 5 likes Bleeding at the injection site: normal and usually minimal. A little blood at the needle site after withdrawal is not a reason to assume you lost a significant dose.…
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Managing an unplanned gap in supply — what changed since Replied, post #46 · Access › Shortages · 25 Aug 2025 · 8 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…
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A ten-fold dose error caught before injection — one year on Replied, post #92 · Devices › Syringes & needles · 3 Aug 2025 · 0 likes Reading units correctly: look at the marking from the side, not from above or below. The bottom of the plunger tip is the reading. Parallax error (wrong angle) is a…
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Temperature loggers worth the money — the long version Replied, post #14 · Devices › Cold chain · 21 Jul 2025 · 0 likes This follows post #11 rather than contradicting it. Temperature excursions: brief excursions above 8 °C are tolerable for most compounds. Hours to a day at room…
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A field-by-field walk through a certificate of analysis Replied, post #31 · Analytics › COA interpretation · 15 Jul 2025 · 27 likes What fields matter on a certificate: lot number matching the vial, test date, the analytical method stated specifically, the measured result as a number, and the…
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Coming back to: When "no data" is the complete and final answer Replied, post #36 · Compounds › Other compounds · 6 Jul 2025 · 22 likes This subcategory exists because some people will research compounds outside the main groups discussed here. The standard of evidence and honesty about its limits…
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Request: a diff view for wiki revisions — the long version Replied, post #14 · Meta › Feature requests · 30 Jun 2025 · 1 like Tracking: staff will update the status of feature requests (under consideration, planned, implemented, declined). Checking back lets you know the fate of your suggestion.
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Which panel is worth repeating and which is worth ignoring Replied, post #49 · Clinical › Bloodwork · 29 Jun 2025 · 0 likes A single value outside interval: usually uninformative on a single draw. What makes a result interesting: a trend across multiple draws, a magnitude well beyond the…
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High-resolution MS on aggregates and what it can see Replied, post #10 · Analytics › Mass spectrometry · 22 Jun 2025 · 0 likes Desalting before analysis: some samples need desalting to remove salts that suppress the peptide signal. Report whether desalting was used, because it can affect the…
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[2026 update] An appeal that failed, and what I would do differently Replied, post #141 · Access › Insurance & coverage · 16 Jun 2025 · 4 likes Denial letters: the stated reason tells you exactly what to submit next. A denial is not final; it is a specification for an appeal. Reading the reason carefully and…
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Follow-up: The lowest dose that does anything: is that a real question? Replied, post #20 · Practice › Dosing & titration · 9 Jun 2025 · 0 likes Coming back to post #18, because the follow-up matters more than the original answer. Reaching a dose and staying there for a year: the question of whether a stable…
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Titles that describe the question, not the situation Replied, post #18 · Start Here › How to Ask · 28 May 2025 · 3 likes On post #14 — agreed on the reasoning, with one qualification. Lab result questions: state the result, the reference interval, and what else is on the same panel. A…
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Obstructive sleep apnoea and a hard endpoint in this class Replied, post #75 · Clinical › Comorbidities · 4 May 2025 · 17 likes Interactions between comorbidities: diabetes and kidney disease together change the risk calculation for hypoglycemia and for medication clearance. They are not…
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Water content on a certificate and why it changes the arithmetic Replied, post #7 · Analytics › COA interpretation · 27 Apr 2025 · 0 likes A certificate of analysis is a statement by its issuer that a defined test was performed on a defined lot and produced a defined result. That is all it is, and it is…
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Biased agonism: a real phenomenon, an over-used explanation Replied, post #133 · Pharmacology › Receptor biology · 20 Mar 2025 · 14 likes Picking up post #130: that is the part I would want checked first. GIP receptor signalling: the glucose-dependent insulinotropic peptide receptor (GIP) is involved in…
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Coverage for the indication versus for the drug — a second dataset Replied, post #22 · Access › Insurance & coverage · 16 Mar 2025 · 20 likes Worth separating two things that post #18 runs together. Two things before anyone answers the substance. First, the context in the first post is clear and specific.…
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One lot is one lot: when a report becomes a pattern — the long version Replied, post #10 · Sourcing › Vendor reports · 15 Mar 2025 · 10 likes Pattern across lots: a single result is a data point. Three or four results from the same supplier showing a consistent pattern becomes a record worth discussing. Two…
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About the Study critique category Replied, post #4 · Evidence › Study critique · 3 Mar 2025 · 22 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…
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About the Journal club category Replied, post #3 · Evidence › Journal club · 20 Jan 2025 · 0 likes As a member rather than staff: the most useful thing I did when I started reading this category was to work through the tag pages rather than the topic list. The topic…
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[2026 update] Lipid changes during rapid weight loss: the expected trajectory Replied, post #18 · Clinical › Bloodwork · 14 Jan 2025 · 0 likes Coming back to post #16, because the follow-up matters more than the original answer. Analytical imprecision: any measurement has an error margin. A small difference in…
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Anaesthesia and elective surgery: the aspiration question — does this still hold? Replied, post #17 · Practice › Interactions · 9 Jan 2025 · 24 likes This follows post #14 rather than contradicting it. Insulin interaction: semaglutide and tirzepatide are not contraindicated with insulin but the combination carries…
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Follow-up: Individual participant data versus aggregate data Replied, post #30 · Evidence › Meta-analyses · 9 Jan 2025 · 0 likes Picking up post #27: that is the part I would want checked first. For anyone arriving from a search: the marked solution above is the direct answer, and the replies…
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Converting between mg/mL and units per dose, both directions Replied, post #108 · Practice › Reconstitution · 29 Nov 2024 · 0 likes Thank you for the correction. I have edited my earlier post with a note rather than silently, so the thread still makes sense to read. The error was mine and it was the…
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Reading a preclinical wound-healing model and its relevance to a human tendon Replied, post #15 · Compounds › Repair & healing peptides · 8 Nov 2024 · 10 likes Why plausible mechanism is not evidence of effect: a mechanism that is chemically or biologically plausible can fail in practice for dozens of reasons —…
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Taste changes and food aversion, reported and discussed Replied, post #35 · Practice › Side effects · 30 Oct 2024 · 26 likes Pancreatitis: a rare but serious event with a specific presentation (epigastric pain, back pain, elevated lipase). If this constellation of findings appears, stopping…
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Follow-up: Where the four-week escalation interval comes from, and what it is not Replied, post #93 · Practice › Dosing & titration · 29 Oct 2024 · 0 likes How the published trials escalated: they used specific step sizes and intervals. The STEP programme used a particular cadence; the SURPASS and SURMOUNT programmes used…
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Oral contraceptives and delayed emptying: what the data shows Replied, post #53 · Practice › Interactions · 16 Jul 2024 · 0 likes Food interactions: most interactions are absorption interactions. Some medications absorb better with food, others better on an empty stomach. With an incretin agonist…
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Cold packs, phase-change material, and what survives ten days Replied, post #96 · Sourcing › Logistics · 12 Jul 2024 · 4 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…
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Splitting a weekly dose in two: the pharmacokinetic argument against — the long version Replied, post #123 · Practice › Dosing & titration · 10 Jul 2024 · 31 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…
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Oral contraceptives and delayed emptying: what the data shows Replied, post #3 · Practice › Interactions · 4 Jul 2024 · 9 likes Picking up post #2: that is the part I would want checked first. Oral medications versus time: if you take an oral medication 30 minutes before semaglutide (which slows…