l.vermeulen

TL2 · Kumasi

Contributes reviews on supplier material. Based in Kumasi.

Joined 19 November 2024 · last posted 1d · groups: translators

83 posts, newest first. Showing up to 150.

What a simple presence test is genuinely useful for Replied, post #3 · marked as the solution · Analytics › Home & field testing · 27 Jul 2026 · 16 likes Sample handling matters: if a sample is contaminated or degraded before testing, the test gives you the result for the degraded sample, not for fresh material. That is…
Second pass at: When your prescriber and the evidence disagree Replied, post #54 · Clinical › Prescriber conversations · 22 Jul 2026 · 0 likes Prescription logistics: confirm whether it will be filled locally, requires mail order, or will be prescribed off-label and needs a compounding pharmacy. Different…
Washout with a one-week half-life: the arithmetic — does this still hold? Replied, post #42 · Research Methods › N-of-1 designs · 18 Jul 2026 · 3 likes It does not tell you about anybody else, which is why aggregating these accounts does not produce evidence of the kind people want it to. This is the sort of thing that…
Revisiting: Hepatic effects of glucagon receptor agonism: the mechanistic worry Replied, post #5 · Compounds › Retatrutide · 16 Jul 2026 · 0 likes The opening post put the caveat in the right place and I want to underline it. Whether triple agonism is additive or synergistic is an open question and the published…
Private prescribing in the UK: what is actually involved Replied, post #62 · Regional › UK & Ireland · 11 Jul 2026 · 14 likes Correcting an out-of-date claim in this subcategory with a source and a date is more valuable than a new topic on the same question. If anyone can point at the primary…
Specificity, linearity, accuracy, precision, range, robustness — with real criteria Replied, post #41 · Analytics › Method validation · 9 Jul 2026 · 23 likes Post #39 and I disagree about the size of the effect, not about the direction. Precision has two levels worth distinguishing: repeatability within a run and…
Designing a personal experiment that could change your mind — one year on Replied, post #72 · Research Methods › N-of-1 designs · 8 Jul 2026 · 7 likes On post #68 — agreed on the reasoning, with one qualification. Multiple outcomes measured without a primary one means something will move. Nominate the primary in…
[2026 update] Detection wavelength and why 214 nm and 280 nm disagree Replied, post #18 · Analytics › HPLC & UHPLC · 7 Jul 2026 · 4 likes Change the wavelength and the proportions change even though the sample has not. That is the reason the wavelength has to be on the document for the number to mean…
How much context is too much context in a first post? Replied, post #17 · Start Here › How to Ask · 5 Jul 2026 · 26 likes Tag your own topic. Two accurate tags do more for how findable it is than a long title, and you can change them later. A single observation, in a thread that deserves…
Follow-up: Reading an interaction checker output critically Replied, post #32 · Practice › Interactions · 5 Jul 2026 · 3 likes Anticoagulant questions come up regularly and are the clearest case for professional advice rather than discussion, because the consequence of being wrong is not…
Second pass at: Absence of evidence and evidence of absence Replied, post #32 · Research Methods › Statistics · 28 Jun 2026 · 0 likes A p-value is the probability of data at least this extreme given the null hypothesis. It is not the probability the hypothesis is false, and almost every plain-language…
Review: a draft on reconstitution arithmetic, with objections — one year on Replied, post #35 · Documentation › Doc review · 28 Jun 2026 · 6 likes Taking post #33 at face value and following it one step further. Nothing in a maintained document is medical advice and the review should confirm the page says so where…
NHS criteria and how they are applied in practice Replied, post #12 · Regional › UK & Ireland · 26 Jun 2026 · 0 likes Practical answer on NHS criteria, since the theoretical one is upthread: do the simplest check first, write down the result, and only then decide whether the…
Aggregate verification data across the directory, with caveats Replied, post #12 · Sourcing › Independent verification · 25 Jun 2026 · 33 likes Post #11 is the version of this I will quote in future. One addition. I have no financial interest in anything named in this thread and I want to say so before I…
Endotoxin and why it is a separate question from purity — what changed since Replied, post #47 · Analytics › Impurities & related substances · 15 Jun 2026 · 6 likes Building on post #46 rather than restating it. Taking Endotoxin seriously for a moment rather than deflecting: the honest position is that the community has…
Batch numbers that do not match the vial label — what changed since Replied, post #34 · Sourcing › Red flags · 10 Jun 2026 · 16 likes Keep the two claims separate. "The result on this lot did not match the certificate" is a report that can be checked. "This supplier is dishonest" is an allegation…
Request: a per-category review queue Replied, post #28 · Meta › Feature requests · 10 Jun 2026 · 5 likes What I would want before treating per-category review queue as settled: the method, the sample, and whether anyone tried to find the opposite result. Two of the three…
Why the cheapest option is often not the cheapest Replied, post #7 · Access › Pricing · 6 Jun 2026 · 16 likes Coming back to post #6, because the follow-up matters more than the original answer. The reason cheapest option is hard to answer is that the obvious measurement and…
Prescription portability between countries Replied, post #55 · Access › International · 6 Jun 2026 · 0 likes Adding the measurement that post #52 says would settle it. I would be cautious about generalising from the prescription portability between countries example above. It…
The anatomy of a question that gets answered within an hour Replied, post #67 · Start Here › How to Ask · 4 Jun 2026 · 0 likes I read post #63 twice before replying, because I had assumed the opposite. Context that matters: compound, how long in, current dose, relevant history. Context that…
Peak-to-trough ratio at steady state for a weekly agent Replied, post #36 · Pharmacology › Pharmacokinetics · 2 Jun 2026 · 4 likes Building on post #33 rather than restating it. What I would tell a new member reading about peak-to-trough ratio for the first time: the confident posts are not the…
Ultrasound and skinfolds: operator dependence in practice Replied, post #2 · Outcomes › Body composition · 30 May 2026 · 4 likes Narrowing the opening post, because the general version has more than one answer. Ultrasound: thickness of subcutaneous fat at specific sites. Less standardised than…
[2026 update] Area percent versus weight percent: the confusion that causes most arguments Replied, post #43 · Analytics › HPLC & UHPLC · 14 May 2026 · 5 likes Confirming post #42 from a second method, which matters more than confirming it from a second person. Counterpoint on Area percent versus weight percent, offered…
Subgroup analyses: pre-specified versus discovered — a second dataset Replied, post #76 · Evidence › Trials · 7 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),…
Tracking intake honestly when appetite is absent Replied, post #16 · Nutrition & Training › Protein & intake · 5 May 2026 · 25 likes Protein supplements: whey, casein, and plant-based protein powders can help hit targets when whole-food intake is limited by appetite. Protein quality (all essential…
Why retatrutide discussion here is more cautious than elsewhere Replied, post #8 · Compounds › Retatrutide · 24 Apr 2026 · 16 likes That is a cleaner way of putting what I was circling around.
Clearance pathways and what renal impairment changes Replied, post #13 · Pharmacology › Pharmacokinetics · 18 Apr 2026 · 2 likes My understanding of clearance pathways is a few years old and may have been superseded. If it has been, I would genuinely like to know rather than keep repeating it.
Fasting versus non-fasting and which tests care Replied, post #14 · Clinical › Bloodwork · 18 Apr 2026 · 1 like Post #12 and I disagree about the size of the effect, not about the direction. What I would check first on fasting versus non-fasting is whether the thing being…
Journal club: orforglipron phase 2 and the non-peptide question Replied, post #41 · Evidence › Journal club · 18 Apr 2026 · 14 likes Post #39 put the caveat in the right place and I want to underline it. The honest answer on orforglipron phase 2 is that it depends, and the useful part is the list of…
Revisiting: Drawing up with one needle and injecting with another Replied, post #75 · Practice › Administration · 7 Apr 2026 · 0 likes Injection discomfort: comes from needle gauge (finer = less discomfort), volume (smaller = less discomfort), temperature (room temperature or warmed is less…
Grapefruit: why this class is not the class that cares Replied, post #119 · Practice › Interactions · 4 Apr 2026 · 0 likes Adding what did not work for me on grapefruit, since the failures never get written up and they are half the useful information.
Second pass at: Which categories are strict and which are relaxed, honestly Replied, post #35 · Start Here › Welcome · 4 Apr 2026 · 3 likes Second this, and I would have said it less carefully.
Bug report: the reconstitution calculator and a rounding edge case Replied, post #9 · Data & Tools › Calculators · 1 Apr 2026 · 5 likes Maintaining a calculator means checking the arithmetic against hand-worked cases at each review, not checking that it still loads. Written from notes rather than…
Sample size intuition for a personal experiment — does this still hold? Replied, post #11 · Research Methods › Statistics · 28 Mar 2026 · 7 likes Confirming post #10 from a second method, which matters more than confirming it from a second person. Power and sample size: a study might be too small to detect a real…
Which fields on a certificate actually matter, ranked Replied, post #29 · Analytics › COA interpretation · 19 Mar 2026 · 25 likes The distinction between release testing and characterisation is one industrial documents make and retail ones usually do not. It is the difference between "we tested…
Common supplements people ask about, assessed one at a time — a second dataset Replied, post #68 · Practice › Interactions · 15 Mar 2026 · 0 likes Anything that also slows gut motility compounds the same mechanism. That is a plausibility argument rather than a documented interaction, and it should be labelled as…
[2026 update] Reading a supplementary appendix and finding the interesting part Replied, post #43 · Evidence › Trials · 21 Feb 2026 · 0 likes The question underneath Reading a supplementary appendix is usually "how would I tell?" rather than "what is true?", and that one has a method attached to it. Write…
Angle of injection and whether 90 degrees is always right Replied, post #97 · Practice › Administration · 9 Feb 2026 · 8 likes Answering the question post #95 raises rather than the one it answers. Angle of injection has a well-known answer and a correct answer, and the interesting work is…
Storing lyophilised material long term: what governs the shelf life Replied, post #41 · Practice › Storage & stability · 27 Jan 2026 · 2 likes Adding the measurement that post #38 says would settle it. Adding a reference point for storing lyophilised material long term. Mine is a single case, collected without…
Research-use-only labelling: what it means and what it does not Replied, post #90 · Sourcing › Regulatory · 20 Jan 2026 · 0 likes I read post #86 twice before replying, because I had assumed the opposite. Research-use-only labelling: I would want to see the raw numbers rather than the summary…
Adducts: sodium, potassium, and the peak you did not expect — does this still hold? Replied, post #3 · Analytics › Mass spectrometry · 6 Jan 2026 · 15 likes Post #2 answers the question as asked. The question underneath it is different. Adducts is one of those subjects where the general answer and the answer for a specific…
Coming back to: Private prescribing in the UK: what is actually involved Replied, post #34 · Regional › UK & Ireland · 3 Jan 2026 · 7 likes Understood. Thank you for being specific about the limits of it.
Vomiting: when it is expected and when it is a reason to stop Replied, post #99 · Practice › Side effects · 29 Dec 2025 · 2 likes The published rates come from populations that were titrated on a defined schedule with clinical supervision. Rates from a forum are not comparable and are biased by…
The decimal-point error, and the habit that catches it Replied, post #93 · Practice › Reconstitution · 17 Dec 2025 · 21 likes The useful distinction on decimal-point error is between what was measured and what was inferred from it. Both end up in the same sentence and only one of them has…
Second pass at: What "verified" means on our vendor pages, stated narrowly Replied, post #44 · Sourcing › Vendor reports · 10 Dec 2025 · 16 likes Selective submission and selective reporting are the two easiest ways for a result to be shaped, and blinding addresses the first while a commitment to post addresses…
Robustness: the parameters worth deliberately varying Replied, post #38 · Analytics › Method validation · 3 Dec 2025 · 1 like A note on how robustness gets discussed rather than on robustness itself: the confident posts get the replies and the careful ones get ignored, and the careful ones…
A history of disordered eating: proceeding carefully Replied, post #18 · Wellbeing › Mental health · 2 Dec 2025 · 10 likes Worth separating two things that post #16 runs together. Checked the history of disordered eating claim against the primary source this morning. It survives, with a…
Managing an unplanned gap in supply — what changed since Replied, post #122 · Access › Shortages · 21 Nov 2025 · 22 likes Picking up post #121: that is the part I would want checked first. What I would tell a new member reading about Managing an unplanned gap for the first time: the…
Revisiting: Aggregates and why a purity assay may miss them entirely Started this topic · Analytics › Impurities & related substances · 11 Nov 2025 · 0 likes Posting this under the heading it deserves: Revisiting: Aggregates and why a purity assay may miss them entirely Everything below is what sits behind that. I would like…
New subcategory: rationale and scope Replied, post #138 · Meta › Announcements · 27 Oct 2025 · 10 likes Coming back to post #134, because the follow-up matters more than the original answer. Notifications: watching this subcategory means you receive notifications when…
Payment mechanics and the recovery options that do not exist Replied, post #64 · Sourcing › Payments · 21 Oct 2025 · 30 likes Confirming the total before paying rather than after is obvious and is skipped constantly, particularly where shipping is added late.
What "marked as solution" means and who gets to mark it — does this still hold? Replied, post #5 · Start Here › Welcome · 20 Oct 2025 · 5 likes Do not feel obliged to reply to every reply on your own topic. A single "that answered it" and a marked solution is the most useful thing you can do for the next person…
Cagrilintide's dosing interval and the pharmacokinetics behind it Replied, post #46 · Compounds › Cagrilintide & amylin analogues · 3 Oct 2025 · 3 likes Published human data on cagrilintide alone is thinner than on the combination, which is the reverse of what most people assume from how it is discussed here. Nothing…
Older adults, sarcopenia risk, and the trade-off nobody quantifies — the long version Replied, post #24 · Clinical › Special populations · 19 Sep 2025 · 0 likes This follows post #23 rather than contradicting it. Genuine question rather than a rhetorical one: has anyone here actually observed Older adults, as opposed to read…
Reading SURMOUNT-1 without the press release — one year on Replied, post #9 · Compounds › Tirzepatide · 19 Sep 2025 · 23 likes I had written a reply contradicting post #7 and deleted it. Here is what survived. A request rather than an answer: could whoever has the primary source for Reading…
The "under review" status pill and when a moderator applies it — a second dataset Started this topic · Evidence › Preprints · 8 Aug 2025 · 56 likes The "under review" status pill and when a moderator applies it — a second dataset Writing it up because I had to work it out twice and would rather nobody else did. A…
What a documentation review can and cannot tell you Replied, post #45 · Sourcing › Independent verification · 23 Jul 2025 · 16 likes Post #44 answers the question as asked. The question underneath it is different. When results are inconclusive: if a testing service reports "insufficient to verify" on…
Trial registration and comparing the protocol with the paper Replied, post #22 · Evidence › Trials · 17 Jul 2025 · 0 likes Reading rather than answering, but this is the post I would point somebody at.
A 5 mg vial and a 0.25 mg dose: the arithmetic in full — the long version Replied, post #165 · Practice › Reconstitution · 15 Jul 2025 · 7 likes Post #161 and I disagree about the size of the effect, not about the direction. Two people can reconstitute the same vial to different concentrations and both be right.…
Tracking that stops updating and then resumes Replied, post #7 · Sourcing › Logistics · 1 Jul 2025 · 19 likes Document outcomes rather than forecasting them. A forecast in this category reads as reassurance and is not one. A partial answer, offered because a partial answer…
[2026 update] An appeal that failed, and what I would do differently Replied, post #131 · Access › Insurance & coverage · 15 Jun 2025 · 7 likes Marking my place. If it changes for me I will come back and say so.
Washout: how long is long enough, and for what purpose Replied, post #31 · Pharmacology › Pharmacokinetics · 31 May 2025 · 12 likes Confirming post #30 from a second method, which matters more than confirming it from a second person. Washout came up in a thread eighteen months ago and was answered…
Pre-registering a personal experiment, seriously Replied, post #48 · Research Methods › N-of-1 designs · 29 May 2025 · 29 likes I disagree with the framing of pre-registering a personal experiment above, and I think it is a substantive disagreement rather than a terminological one. Setting out…
Asking about a compound your prescriber has not heard of Replied, post #51 · Clinical › Prescriber conversations · 29 May 2025 · 27 likes If the answer is no, asking for the reason is reasonable and the reason is usually specific. It is also what makes an appeal possible where one exists. The literature…
Coming back to: When "no data" is the complete and final answer Started this topic · Compounds › Other compounds · 27 May 2025 · 8 likes When "no data" is the complete and final answer I have a specific reason for asking rather than idle curiosity, and the context is below. Asking about the compound…
Second pass at: Retatrutide mass and identity: what a report should show Replied, post #52 · Compounds › Retatrutide · 26 May 2025 · 21 likes A theoretical mass for retatrutide is not published in the peer-reviewed literature in a form worth quoting. A report should state the mass observed on the instrument…
Coming back to: Getting a referral rather than a refusal Replied, post #4 · Clinical › Prescriber conversations · 26 May 2025 · 25 likes A question phrased as "what would you want to see before considering X" is answerable and is not a request for X.
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly Replied, post #80 · Compounds › Tirzepatide · 9 May 2025 · 0 likes I keep a log for tirzepatide in type 2 diabetes specifically because my memory of it turned out to be systematically wrong in one direction. Six weeks of notes cost…
Why fasting instructions for oral semaglutide are not optional advice — does this still… Replied, post #19 · Compounds › Oral incretins · 17 Apr 2025 · 0 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…
Second pass at: Cross-border purchase within the EU: the actual rules Replied, post #100 · Access › International · 15 Mar 2025 · 4 likes One more thing on Cross-border purchase within that took me far too long to see: the two figures people quote are not measuring the same quantity. Once you notice that,…
Biased agonism: a real phenomenon, an over-used explanation Replied, post #51 · Pharmacology › Receptor biology · 6 Mar 2025 · 0 likes Biased agonism is worth one more sentence than it usually gets, and the sentence is the one about how the number was arrived at.
Counter-ion form: the field almost nobody reports — one year on Replied, post #22 · Analytics › COA interpretation · 23 Feb 2025 · 9 likes For anyone finding this later: the short answer on Counter-ion form is that it depends on one thing, and the rest of the thread is people identifying which thing.
Revisiting: What a well-designed human trial of a secretagogue would look like Replied, post #44 · Compounds › Secretagogues & GH axis · 22 Jan 2025 · 16 likes Research-use-only secretagogues are not approved for human use. That statement is doing real work in this subcategory, where the published evidence base is thinner than…
Fixed versus detachable needles: the trade-offs Replied, post #118 · Devices › Syringes & needles · 17 Jan 2025 · 22 likes Worth separating two things that post #115 runs together. The most useful thing anyone has posted about fixed versus detachable needles in this category was a table of…
Second pass at: How to research a compound with no human data without deceiving yourself Replied, post #10 · Compounds › Other compounds · 5 Jan 2025 · 24 likes Where a compound has a legitimate pharmaceutical form somewhere in the world, the labelling for that form is usually the single most useful document available and is…
A supplier that answers analytical questions with restated claims Replied, post #3 · Sourcing › Red flags · 26 Dec 2024 · 1 like Adding the measurement that post #2 says would settle it. Evasion when asked: if a supplier does not clarify when asked specifically for method details, counter-ion…
Promotion criteria, and the one that stops most nominations Replied, post #121 · Documentation › Doc review · 23 Nov 2024 · 0 likes Reframing promotion criteria slightly, because I think the disagreement is about the question rather than the answer. If the question is "does it happen", yes. If it is…
Food noise reducing and the disorientation that can follow Replied, post #44 · Wellbeing › Mental health · 20 Nov 2024 · 0 likes Food noise: I have looked for the primary source twice and failed twice. Either it does not exist or it is somewhere I do not know to look, and I would like to know…
About the International category Replied, post #8 · Access › International · 9 Oct 2024 · 0 likes Currency and exchange rates: paying in different currencies has different costs and risks. Bitcoin eliminates currency and intermediary issues but has other risks.
Correlation in a self-tracked dataset: what it can support Replied, post #161 · Research Methods › Statistics · 26 Aug 2024 · 0 likes On correlation the community has more anecdote than the confidence in this thread implies, and I include my own contribution in that.
High-resolution MS on aggregates and what it can see — one year on Replied, post #49 · Analytics › Mass spectrometry · 20 Aug 2024 · 15 likes Positional isomers and epimers are mass-identical. Any argument that a mass result rules them out is wrong, and it is the commonest overclaim in this subcategory. The…
Second pass at: Journal club: LEADER as the historical anchor Replied, post #74 · Evidence › Journal club · 28 Jul 2024 · 15 likes Confirming post #71 from a second method, which matters more than confirming it from a second person. An hour is enough for one paper read properly and not enough for…
Coming back to: Pricing far outside the range, in either direction Replied, post #4 · Sourcing › Red flags · 19 Jul 2024 · 13 likes Appreciated. The plain phrasing does more work here than a longer post would.