b.wikstrom

TL2 Moderator · Porto

Contributes reviews on supplier material. Based in Porto.

Joined 29 July 2025 · last posted 8d

82 posts, newest first. Showing up to 150.

Here for the analytics and not much else Replied, post #60 · Lounge › Introductions · 20 Jul 2026 · 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.
Coming back to: Specificity, linearity, accuracy, precision, range, robustness — with… Replied, post #95 · Analytics › Method validation · 18 Jul 2026 · 0 likes Forced degradation studies: deliberately stress the material with acid, base, oxidant, heat, light to generate degradation products and demonstrate that the method can…
[2026 update] Interpreting a result that disagrees with the supplier's certificate Replied, post #81 · Sourcing › Independent verification · 11 Jul 2026 · 13 likes Picking up post #78: that is the part I would want checked first. VendorInvestigate: documentation and supplier-practice review. Reviews paperwork rather than vials.…
Alcohol: what is documented and what is folklore Replied, post #79 · Practice › Interactions · 27 Jun 2026 · 1 like 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…
About the Welcome category Replied, post #4 · Start Here › Welcome · 25 Jun 2026 · 1 like 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…
Batch numbers that do not match the vial label Replied, post #33 · Sourcing › Red flags · 23 Jun 2026 · 1 like Evasion when asked: if a supplier does not clarify when asked specifically for method details, counter-ion form, or batch origin, that itself is a red flag worth…
Run-in periods and the population they select Replied, post #135 · Evidence › Trials · 12 Jun 2026 · 14 likes Multiplicity and multiple comparisons: if a trial tests many hypotheses, the chance of a false positive on at least one by random chance increases. This is why…
What I would want from a home test that does not exist yet — what changed since Replied, post #47 · Analytics › Home & field testing · 8 Jun 2026 · 0 likes Immunoassay limitations: tests that use antibodies have cross-reactivity limitations. An antibody raised to semaglutide will cross-react to some degree with tirzepatide…
Comparing prices across jurisdictions without misleading yourself Replied, post #51 · Access › Pricing · 7 Jun 2026 · 0 likes This follows post #48 rather than contradicting it. Price variation between pharmacies: identical prescriptions can cost different amounts at different pharmacies…
Spreadsheets: an appreciation — what changed since Replied, post #63 · Lounge › Off topic · 6 Jun 2026 · 4 likes Worth separating two things that post #59 runs together. Newer drugs and mechanisms: when a new drug launches or a new mechanism is discovered, the Lounge is a place to…
Second pass at: A pooled estimate that changed when one trial was added Replied, post #9 · Evidence › Meta-analyses · 20 May 2026 · 10 likes Publication bias: what did not get published? Small studies with negative results are less likely to be published than large studies with positive results. A forest…
Second pass at: Metformin co-administration and additive GI effects Replied, post #107 · Practice › Interactions · 18 May 2026 · 5 likes On post #103 — agreed on the reasoning, with one qualification. Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down what…
Second pass at: What a 2 ppm match establishes, and what it does not Replied, post #12 · Analytics › Mass spectrometry · 10 May 2026 · 2 likes I read post #10 twice before replying, because I had assumed the opposite. Two things before anyone answers the substance. First, the context in the first post is clear…
Measurement error in home scales, with a worked standard deviation — the long version Replied, post #97 · Research Methods › Statistics · 6 May 2026 · 2 likes Effect sizes: the magnitude of a difference, not just whether it is statistically significant. A difference that is significant (p
Why the titration planner refuses to produce a schedule below a floor Replied, post #64 · Data & Tools › Calculators · 21 Apr 2026 · 17 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…
An 18-month record including the parts that went badly Replied, post #2 · Outcomes › Progress reports · 20 Apr 2026 · 5 likes Protein intake and resistance training: both self-reported and therefore optimistic in most reports. Recording them anyway creates a record you can look back on.
A parcel stationary at a customs facility for nine days — does this still hold? Replied, post #14 · Sourcing › Logistics · 10 Apr 2026 · 0 likes Customs holds: if a parcel is held at customs and you can contact customs directly, declaring your personal use and providing documentation (order, labelling) can help.…
Type 2 diabetes and the largest part of the evidence base Replied, post #48 · Clinical › Comorbidities · 30 Mar 2026 · 10 likes Chronic kidney disease: compounds in this class have renal benefit in people with kidney disease. The benefit appears to be additive to other renal-protective agents,…
Journal club: is percentage weight change the right endpoint? Replied, post #8 · marked as the solution · Evidence › Journal club · 22 Mar 2026 · 25 likes SURMOUNT-1 (N Engl J Med 2022): Tirzepatide obesity trial. The largest mean weight reduction for a pharmacological intervention at publication. Read the categorical…
Spreadsheets: an appreciation — what changed since Replied, post #4 · Lounge › Off topic · 21 Mar 2026 · 25 likes post #3 answers the question as asked. The question underneath it is different. Industry and supply chain: post about manufacturing, pharmaceutical economics, or market…
Why chargeback is not the safety net people assume Replied, post #5 · Sourcing › Payments · 18 Mar 2026 · 16 likes This follows post #2 rather than contradicting it. I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The…
Request: export my own posts — one year on Replied, post #59 · Meta › Feature requests · 15 Mar 2026 · 0 likes Use case: explain why you think the feature would help. "I would use this to..." makes the request concrete.
[2026 update] What a purity-only report leaves out Replied, post #48 · Sourcing › Independent verification · 9 Mar 2026 · 8 likes Picking up post #45: that is the part I would want checked first. Medutest: combined purity and identity reporting. Appears throughout vendor documentation. Where a…
Angle of injection and whether 90 degrees is always right Replied, post #110 · Practice › Administration · 3 Mar 2026 · 32 likes A site rotation scheme that actually works: abdomen, outer thigh, back of arm, outer hip. Rotate through them in order, move a minimum 2 cm between consecutive sites,…
Revisiting: Liver enzymes drifting down and what that usually means Replied, post #6 · Clinical › Bloodwork · 21 Feb 2026 · 32 likes Coming back to post #4, because the follow-up matters more than the original answer. Practical note that does not fit anywhere else. Whatever you conclude from this…
Why "dose equivalence" between different incretin analogues is a weak concept Replied, post #88 · Practice › Dosing & titration · 19 Feb 2026 · 20 likes Titrating on tolerability rather than on the calendar: some people escalate when they tolerate a dose well, others escalate on the prescribed schedule regardless. The…
Liver enzymes drifting down and what that usually means Replied, post #57 · Clinical › Bloodwork · 16 Feb 2026 · 12 likes post #56 answers the question as asked. The question underneath it is different. I disagree with the reply above, and I think the disagreement is substantive rather…
What I would record differently if I started again — the long version Replied, post #27 · Outcomes › Progress reports · 13 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…
Reconstitution volumes that produce round numbers, tabulated Replied, post #44 · Practice › Reconstitution · 12 Feb 2026 · 8 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…
Interpreting a result that disagrees with the supplier's certificate Replied, post #112 · Sourcing › Independent verification · 7 Feb 2026 · 0 likes Picking up post #109: that is the part I would want checked first. Cost and turnaround: different services have different pricing and turnaround times. Janoshik's…
[2026 update] Confounding by indication, explained with a concrete example Replied, post #26 · Evidence › Study critique · 4 Feb 2026 · 0 likes 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…
Comparing my trajectory with the trial curves, carefully — a second dataset Replied, post #5 · Outcomes › Progress reports · 1 Feb 2026 · 18 likes I read post #3 twice before replying, because I had assumed the opposite. Non-scale victories: muscle gain or maintenance, clothing fit, energy level, and capability…
A partial dose because the pen emptied mid-injection Replied, post #85 · Practice › Administration · 10 Jan 2026 · 24 likes Injecting into an area that has become firm: lipohypertrophy — thickened fatty tissue from repeated injection in one area — changes local tissue absorption. Avoid…
A widely repeated interaction claim that turns out to be unsupported Replied, post #14 · Practice › Interactions · 25 Dec 2025 · 0 likes Alcohol: no absolute contraindication but it raises gastrointestinal irritation risk and this drug class already does that. The conservative position during titration…
Common supplements people ask about, assessed one at a time — a second dataset Replied, post #22 · Practice › Interactions · 18 Dec 2025 · 7 likes I read post #20 twice before replying, because I had assumed the opposite. Vitamins: most vitamins have no significant interaction. Fat-soluble vitamins (A, D, E, K)…
Interpreting a result that disagrees with the supplier's certificate Replied, post #47 · Sourcing › Independent verification · 18 Dec 2025 · 24 likes Worth separating two things that post #43 runs together. Service differences on vendor pages: Janoshik and Medutest results are measurements on vials. PeptideMeter…
The decimal-point error, and the habit that catches it Replied, post #67 · Practice › Reconstitution · 16 Dec 2025 · 0 likes How much of the diluent volume the powder itself displaces: for a small peptide vial, the powder volume is negligible. For a larger vial or a kit with multiple…
Dead volume across syringe and needle combinations Replied, post #36 · Devices › Syringes & needles · 10 Dec 2025 · 16 likes Picking up post #33: that is the part I would want checked first. Sharps disposal: needles and syringes should be disposed in a sharps container (a rigid,…
Stepping down deliberately, and how to do it without losing progress Replied, post #18 · Practice › Dosing & titration · 23 Nov 2025 · 5 likes On post #14 — agreed on the reasoning, with one qualification. Two things before anyone answers the substance. First, the context in the first post is clear and…
Promotion criteria, and the one that stops most nominations — the long version Replied, post #90 · Documentation › Doc review · 9 Nov 2025 · 0 likes Revision disputes: if you disagree with an edit a maintainer made to a page, discuss it here. The goal is accuracy and clarity, not authorship.
[2026 update] What steady state means for the decision to escalate Replied, post #30 · Practice › Dosing & titration · 7 Nov 2025 · 3 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…
Temperature loggers worth the money — the long version Replied, post #64 · Devices › Cold chain · 28 Oct 2025 · 8 likes Domestic refrigeration: most lyophilised peptides are stored at 2–8 °C (35–46 °F). That is standard refrigerator temperature. Check your refrigerator's actual…
Payment mechanics and the recovery options that do not exist Replied, post #36 · Sourcing › Payments · 20 Oct 2025 · 8 likes Payment mechanics: most suppliers accept bank transfer, crypto, and some accept credit cards. Each has different risk and different fees. Understand before you commit…
Payment mechanics and the recovery options that do not exist Replied, post #9 · Sourcing › Payments · 18 Oct 2025 · 0 likes Refund policy before ordering: ask what the policy is if you receive damaged material or if the order is incorrect. Get it in writing or screenshot it.
Retatrutide's phase 2 heart-rate signal and how to think about it Replied, post #7 · Compounds › Retatrutide · 12 Oct 2025 · 25 likes Why this subcategory is more cautious than elsewhere: retatrutide is investigational, phase 3 is ongoing, and the heart-rate signal in phase 2 is not negligible.…
Compounds this community declines to help with, and why Replied, post #62 · Compounds › Other compounds · 4 Oct 2025 · 1 like AOD-9604 is a fragment of human growth hormone and has been discussed as a potential weight-loss agent based on theoretical mechanism. The fragment hypothesis — that…
Second pass at: The mass-error checker and its intended scope Replied, post #21 · Data & Tools › Calculators · 20 Sep 2025 · 0 likes This follows post #18 rather than contradicting it. Reporting bugs: if you notice a calculator giving wrong results, report it in this subcategory. Bugs are fixed when…
The most useful thing you learned here that was not the answer you came for — a second… Replied, post #37 · Lounge › Off topic · 15 Sep 2025 · 0 likes Coming back to post #35, because the follow-up matters more than the original answer. Not a rules-free zone: the guidelines still apply. No phones, no Telegram, no…
Detection wavelength and why 214 nm and 280 nm disagree Replied, post #46 · Analytics › HPLC & UHPLC · 10 Sep 2025 · 5 likes Column chemistry and particle size: smaller particles (1.7 μm) give better resolution and higher efficiency than larger particles (3.5 μm or 5 μm), at the cost of…
[2026 update] Hello from a laboratory that does not do peptides Started this topic · Lounge › Introductions · 26 Aug 2025 · 1 like Hello from a laboratory that does not do peptides Writing it up because I had to work it out twice and would rather nobody else did. Lower-stakes topic, but the…
Pinch or no pinch, and how needle length changes the answer Replied, post #26 · Practice › Administration · 20 Aug 2025 · 19 likes Cold solution and stinging: warming the vial in your hands for a minute before injection reduces the stinging sensation substantially. This is the simplest thing to try…
Coming back to: Sample size calculations, read backwards from the published number Replied, post #75 · Evidence › Trials · 17 Aug 2025 · 32 likes I read post #73 twice before replying, because I had assumed the opposite. Surrogate endpoints: an endpoint that is not the outcome that matters but is measured as a…
What the GIP component of tirzepatide is thought to contribute, and how confident we can… Replied, post #27 · Compounds › Tirzepatide · 16 Aug 2025 · 13 likes This follows post #24 rather than contradicting it. SURMOUNT-4 used a randomised withdrawal design: everyone titrated, then those on maintenance were randomised to…
A field-by-field walk through a certificate of analysis Replied, post #46 · Analytics › COA interpretation · 15 Jul 2025 · 17 likes Worth separating two things that post #42 runs together. Reading old certificates: if a certificate is dated years ago, the lot it describes might be old. That is not…
Reading a regulatory notice rather than an article about it — what changed since Replied, post #19 · Sourcing › Regulatory · 13 Jun 2025 · 0 likes This follows post #16 rather than contradicting it. Labelling and intended use: a compound sold as "research-use-only" does not change its pharmacology if ingested. It…
Coming back to: Semaglutide half-life: where the 165 to 184 hour figure comes from Replied, post #25 · Compounds › Semaglutide · 12 Jun 2025 · 32 likes On post #21 — agreed on the reasoning, with one qualification. The 165 to 184 hour range: that is roughly 7 to 7.6 days, which is why the weekly schedule works. Below 4…
The CagriSema phase 2 paper and what a fixed combination buys — the long version Replied, post #24 · Compounds › Cagrilintide & amylin analogues · 6 Jun 2025 · 14 likes Reading the phase 2 paper: it establishes tolerability and efficacy in a selected population on a defined dose escalation. It does not establish the lowest effective…
[2026 update] Citation sweep results: how many references did not say what was claimed Replied, post #34 · Meta › Wiki maintenance · 5 Jun 2025 · 0 likes Maintainer handovers: if a page's maintainer is inactive and needs a new one, discussing that here can facilitate the transition.
Journal club: STEP 4 and what a withdrawal design can prove Replied, post #50 · Evidence › Journal club · 3 Jun 2025 · 25 likes I read post #48 twice before replying, because I had assumed the opposite. PIONEER 6 (N Engl J Med 2019): Cardiovascular safety trial for oral semaglutide, not…
Detection wavelength and why 214 nm and 280 nm disagree Started this topic · Analytics › HPLC & UHPLC · 22 May 2025 · 23 likes On the subject in the title: Detection wavelength and why 214 nm and 280 nm disagree Working notes rather than a conclusion. Posting the method first, because I know…
Why quantitation is the hard part, not detection Replied, post #9 · Analytics › Home & field testing · 12 Apr 2025 · 15 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…
Review: a draft on reconstitution arithmetic, with objections Replied, post #80 · Documentation › Doc review · 29 Mar 2025 · 9 likes New maintainer recruitment: if a page's maintainer is inactive and updates are needed, suggesting a new maintainer here can help transition responsibility.
Adjudicated events and why the definition matters — the long version Replied, post #67 · Evidence › Trials · 27 Mar 2025 · 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…
Why cagrilintide alone is discussed so much less than in combination Replied, post #27 · Compounds › Cagrilintide & amylin analogues · 25 Mar 2025 · 10 likes Coming back to post #25, because the follow-up matters more than the original answer. The CagriSema phase 2 paper: a fixed combination of the two components in one…
Journal club: SURMOUNT-OSA and a hard endpoint in a soft field Replied, post #26 · Evidence › Journal club · 6 Mar 2025 · 0 likes I read post #24 twice before replying, because I had assumed the opposite. STEP 1 (N Engl J Med 2021): The pivotal obesity trial for semaglutide and the reference point…
Charge states for a 4 kDa peptide, worked through Replied, post #4 · Analytics › Mass spectrometry · 1 Mar 2025 · 0 likes Electrospray ionisation produces multiply charged ions. For a 4 kDa peptide you expect mostly 2+, 3+, and 4+ charge states. Reading an electrospray spectrum means…
Pharmaceutical compounding rules, summarised from primary sources Replied, post #8 · Sourcing › Regulatory · 27 Feb 2025 · 28 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.
Research-use-only labelling: what it means and what it does not — the long version Replied, post #88 · Sourcing › Regulatory · 19 Feb 2025 · 1 like Import restrictions vary by compound and by jurisdiction: what is a controlled substance in one place is legal to purchase in another. What you can import for personal…
Coming back to: Recording a dissent on a document rather than suppressing it Replied, post #20 · Documentation › Doc review · 31 Dec 2024 · 0 likes Review date disputes: if a maintained page's review date is approaching and it has not been updated, post a note so the maintainers notice.
Fixed versus detachable needles: the trade-offs Replied, post #66 · Devices › Syringes & needles · 23 Dec 2024 · 20 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…
Follow-up: Tirzepatide's shorter half-life and its one practical consequence Replied, post #60 · Compounds › Tirzepatide · 29 Nov 2024 · 19 likes Mass and charge states: tirzepatide is about 4813.5 Da and on an electrospray instrument you would expect to see charge states mostly in the 2+ to 4+ range, the same as…
Meeting a protein target on a suppressed appetite — does this still hold? Replied, post #16 · Nutrition & Training › Protein & intake · 22 Nov 2024 · 13 likes post #15 is right about the mechanism and I think understates the practical bit. Eating anything at all: on substantial appetite suppression, eating enough total…
Choosing which test to pay for, given a fixed budget — does this still hold? Replied, post #39 · Sourcing › Independent verification · 20 Nov 2024 · 15 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…
Follow-up: Where the four-week escalation interval comes from, and what it is not Replied, post #85 · Practice › Dosing & titration · 17 Oct 2024 · 6 likes Splitting a weekly dose in two: the pharmacokinetic argument against is that you want the benefit of long half-life, which gives a slowly changing plasma level from a…
Coming back to: The nausea timeline across the first four weeks, with a tabulated log Replied, post #14 · Practice › Side effects · 15 Sep 2024 · 10 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.
Why pulsatile secretion matters for interpreting secretagogue claims — a second dataset Replied, post #8 · Compounds › Secretagogues & GH axis · 2 Sep 2024 · 16 likes GHRH analogues versus ghrelin mimetics are often conflated but they are different mechanisms. GHRH analogues (like CJC-1295) cause the pituitary to release growth…
SURPASS-2 and the comparator dose question that will not go away Replied, post #9 · Compounds › Tirzepatide · 2 Sep 2024 · 0 likes Coming back to post #7, because the follow-up matters more than the original answer. The GIP component: GIP receptor agonism is thought to amplify the GLP-1 effect on…
Follow-up: Dead volume across syringe and needle combinations Replied, post #26 · Devices › Syringes & needles · 26 Aug 2024 · 1 like Picking up post #23: 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…
Second pass at: Retatrutide dose escalation in the published trials Replied, post #95 · Compounds › Retatrutide · 22 Jul 2024 · 8 likes This follows post #92 rather than contradicting it. Hepatic effects: glucagon receptor agonism promotes hepatic fat oxidation, which is mechanistically plausible for…
Oral contraceptives and delayed emptying: what the data shows Replied, post #61 · Practice › Interactions · 17 Jul 2024 · 6 likes This follows post #58 rather than contradicting it. I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The…
Cold packs, phase-change material, and what survives ten days Replied, post #82 · Sourcing › Logistics · 8 Jul 2024 · 32 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…
Assessing a warm arrival: the decision process — one year on Replied, post #46 · Sourcing › Logistics · 30 May 2024 · 8 likes Documentation after arrival: photograph the parcel and its contents on arrival. If something later turns out wrong (damage, loss, wrong item) you have evidence of the…