g.verhoeven

TL2 Moderator · Breda

Contributes reviews on supplier material. Based in Breda.

Joined 10 November 2024 · last posted 6d

87 posts, newest first. Showing up to 150.

Fasting versus non-fasting and which tests care Replied, post #75 · Clinical › Bloodwork · 22 Jul 2026 · 11 likes This follows post #72 rather than contradicting it. Biological variation: the person-to-person variation in a biomarker for a healthy person is larger than most people…
Named, unnamed and unspecified impurities as regulatory categories — the long version Replied, post #101 · Analytics › Impurities & related substances · 22 Jul 2026 · 0 likes Off-target structures: if the sequence synthesis goes wrong, a completely different amino acid can be incorporated. The resulting off-target peptide is a structural…
Primary endpoint hierarchies and why order matters — one year on Replied, post #55 · Evidence › Trials · 22 Jul 2026 · 7 likes Dropout is information: high dropout rates can indicate tolerability problems or lower efficacy than the summary suggests. Where the analysis handled dropouts matters.…
Request: a per-category review queue Replied, post #91 · Meta › Feature requests · 9 Jul 2026 · 6 likes post #90 is right about the mechanism and I think understates the practical bit. Tracking: staff will update the status of feature requests (under consideration,…
How much context is too much context in a first post? Replied, post #38 · Start Here › How to Ask · 7 Jul 2026 · 28 likes Arithmetic questions: write out the steps. "I have a 10 mg vial, I added 2 mL, I want a 0.25 mg dose, and I get this number for the syringe mark" is answerable. "How…
Coming back to: Why a preprint's supplementary material is often the best part Replied, post #91 · Evidence › Preprints · 28 Jun 2026 · 8 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…
What I would want from a home test that does not exist yet — what changed since Replied, post #70 · Analytics › Home & field testing · 26 Jun 2026 · 0 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…
Reading U-100 graduations, with a conversion table Replied, post #35 · Devices › Syringes & needles · 23 Jun 2026 · 17 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…
A structured critique template this community uses — a second dataset Replied, post #16 · Evidence › Study critique · 21 Jun 2026 · 28 likes post #15 answers the question as asked. The question underneath it is different. Choosing the worst interpretation: "The confidence interval includes a harmful effect"…
Tesamorelin has an approved indication — what that changes about the evidence Replied, post #17 · Compounds › Secretagogues & GH axis · 20 Jun 2026 · 5 likes post #16 answers the question as asked. The question underneath it is different. Reading a rodent study on a secretagogue without over-extrapolating: rodent studies can…
Coming back to: Payment method and the leverage it gives you, ranked Replied, post #7 · Sourcing › Payments · 19 Jun 2026 · 13 likes Bank transfer and finality: once a bank transfer is sent, it is final. The money is gone. There is no recourse with the bank if the supplier disappears. That is why…
Comparing prices across jurisdictions without misleading yourself Replied, post #78 · Access › Pricing · 14 Jun 2026 · 15 likes I read post #76 twice before replying, because I had assumed the opposite. Having read the exchange above, I think I was wrong earlier in this topic and I want to say…
Revisiting: PCOS and metabolic overlap: what is and is not studied Replied, post #39 · Clinical › Comorbidities · 10 Jun 2026 · 1 like Obstructive sleep apnoea: SURMOUNT-OSA used an objective endpoint, the apnoea-hypopnoea index. Reduction was substantial. Whether the benefit is weight loss or a direct…
Dizziness on standing: the ordinary explanation first — one year on Replied, post #9 · Nutrition & Training › Hydration & electrolytes · 10 Jun 2026 · 7 likes Magnesium: deficiency during weight loss is common and symptoms (fatigue, muscle cramps) are nonspecific. Supplementation is inexpensive and low-risk if needed.
A reconstituted vial's beyond-use date and the reasoning behind common figures Replied, post #43 · Practice › Storage & stability · 4 Jun 2026 · 4 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.
A single out-of-range value on an otherwise normal panel Replied, post #53 · Clinical › Bloodwork · 31 May 2026 · 19 likes On post #49 — agreed on the reasoning, with one qualification. A single value outside interval: usually uninformative on a single draw. What makes a result interesting:…
Secretagogues and glucose tolerance: the mechanistic concern Replied, post #10 · Compounds › Secretagogues & GH axis · 22 May 2026 · 14 likes Coming back to post #8, because the follow-up matters more than the original answer. Secretagogues and glucose tolerance: there is a mechanistic concern that sustained…
Mass error in ppm: the arithmetic and the caveat — a second dataset Replied, post #2 · Analytics › Mass spectrometry · 21 May 2026 · 5 likes Resolution: "high resolution" commonly means
Designing a personal experiment that could change your mind — one year on Replied, post #48 · Research Methods › N-of-1 designs · 19 May 2026 · 11 likes Statistical analysis of n-of-1 data: comparing before versus after with a t-test or similar is one approach. Plotting the data visually is another. Both are valid.
How this community labels and discusses unrefereed work — the long version Replied, post #21 · Evidence › Preprints · 14 May 2026 · 5 likes Server repositories: medRxiv for medicine, bioRxiv for biology. Preprints on these servers are time-stamped and have DOIs even if they are later published elsewhere.…
Request: show the solution author in the topic list — what changed since Replied, post #28 · Meta › Feature requests · 1 May 2026 · 10 likes post #27 is right about the mechanism and I think understates the practical bit. Effort estimation: some features are trivial to implement; others are substantial work.…
When your prescriber and the evidence disagree Replied, post #10 · Clinical › Prescriber conversations · 23 Apr 2026 · 27 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…
Blind submission and why it changes minds — the long version Replied, post #12 · Sourcing › Independent verification · 6 Apr 2026 · 2 likes When results are inconclusive: if a testing service reports "insufficient to verify" on a documentation review, that is not a negative finding about the product. It…
Liver enzymes drifting down and what that usually means Replied, post #72 · Clinical › Bloodwork · 30 Mar 2026 · 29 likes Lipid panel interpretation: total, LDL, HDL, triglycerides all on one panel. Reading them together is more informative than reading one value in isolation. An elevated…
What a good consultation looks like from the other side Replied, post #27 · Clinical › Prescriber conversations · 28 Mar 2026 · 0 likes post #26 answers the question as asked. The question underneath it is different. Questions about dose: asking "how will we determine whether this dose is working for…
Packaging that arrived damaged: documenting it properly — a second dataset Replied, post #58 · Sourcing › Logistics · 19 Mar 2026 · 2 likes post #57 answers the question as asked. The question underneath it is different. At what point is a parcel genuinely a problem: if it was despatched weeks ago and there…
Revisiting: Journal club: SURMOUNT-1, read without the press release Replied, post #25 · Evidence › Journal club · 13 Mar 2026 · 14 likes post #24 is right about the mechanism and I think understates the practical bit. SELECT (N Engl J Med 2023): Semaglutide cardiovascular outcomes without diabetes. The…
Search filters: what is missing Replied, post #30 · Meta › Site feedback · 24 Feb 2026 · 1 like Picking up post #27: that is the part I would want checked first. Performance: if pages are slow to load, timeouts occur, or the site is unresponsive, that is worth…
Revisiting: A page that has drifted out of date and needs a maintainer Replied, post #103 · Documentation › Wiki requests · 22 Feb 2026 · 0 likes Format suggestions: if you think a maintained page could be clearer in its presentation (different section structure, different examples, added graphics) suggest the…
Second pass at: Choosing a concentration on purpose rather than by accident Replied, post #8 · Practice › Reconstitution · 8 Feb 2026 · 13 likes A 10 mg vial reconstituted three different ways: 1 mL diluent gives 10 mg/mL, 2 mL gives 5 mg/mL, 4 mL gives roughly 2.5 mg/mL. The arithmetic is the same; the…
Reading U-100 graduations, with a conversion table Replied, post #10 · Devices › Syringes & needles · 5 Feb 2026 · 1 like Insulin syringe graduations: U-100 syringes are marked in units where 100 units = 1 mL. Always confirm your syringe is U-100. Confusion between insulin units and…
Coming back to: Reading a supplier's product description as a marketing document Replied, post #9 · Compounds › Other compounds · 29 Jan 2026 · 25 likes Worth separating two things that post #5 runs together. Two things before anyone answers the substance. First, the context in the first post is clear and specific.…
A parcel stationary at a customs facility for nine days Replied, post #21 · Sourcing › Logistics · 18 Jan 2026 · 0 likes Customs outcomes are not predictable at the level of an individual parcel. What is predictable is that consistent, accurate declarations correlate with fewer…
How to ask about something you suspect is a bad idea Replied, post #45 · Start Here › How to Ask · 17 Jan 2026 · 0 likes Asking a follow-up: new topic or reply in the old one? If the answer depends on the previous post, reply. If it is a question that makes sense without the previous…
Robustness: the parameters worth deliberately varying Replied, post #42 · Analytics › Method validation · 5 Dec 2025 · 18 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…
Research-use-only labelling: what it means and what it does not Replied, post #67 · Sourcing › Regulatory · 2 Dec 2025 · 28 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…
Tracking a preprint to publication: a worked example Replied, post #15 · Evidence › Preprints · 30 Nov 2025 · 18 likes Do not build anything on a preprint that you would mind rebuilding: if the preprint later changes substantially in revision or shows different results when published,…
Follow-up: Glucagon receptor agonism in a weight-loss compound Replied, post #7 · Pharmacology › Receptor biology · 1 Nov 2025 · 0 likes Species differences: rodent studies show the same compounds produce effects in rodents that predict human effects reasonably well for semaglutide and tirzepatide. The…
Documentation that materially improves an appeal's chances Replied, post #44 · Access › Insurance & coverage · 29 Oct 2025 · 0 likes This follows post #41 rather than contradicting it. I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The…
Follow-up: What a seizure notice actually says Replied, post #23 · Sourcing › Logistics · 26 Oct 2025 · 14 likes Reshipment after seizure: if a parcel is seized, some suppliers will reship; others will not. That is a supplier choice and should be understood before ordering in a…
Citing a preprint in a maintained document: our rule and its reasoning — does this still… Replied, post #34 · Evidence › Preprints · 28 Sep 2025 · 0 likes I read post #32 twice before replying, because I had assumed the opposite. Preprints for speed: some important preliminary findings are posted as preprints to…
Trial registration and comparing the protocol with the paper Replied, post #41 · Evidence › Trials · 25 Sep 2025 · 1 like Confounding in observational data: a third variable can explain an apparent association. In a randomised trial, randomisation balances unknown confounders. In…
Anxiety in the first weeks: drug, situation, or both — what changed since Replied, post #30 · Wellbeing › Mental health · 25 Sep 2025 · 8 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…
Second pass at: Journal club: STEP 4 and what a withdrawal design can prove Replied, post #69 · Evidence › Journal club · 23 Sep 2025 · 13 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…
Angle of injection and whether 90 degrees is always right Replied, post #22 · Practice › Administration · 14 Sep 2025 · 2 likes Worth separating two things that post #18 runs together. A site rotation scheme that actually works: abdomen, outer thigh, back of arm, outer hip. Rotate through them…
Second pass at: The mass-error checker and its intended scope Replied, post #13 · Data & Tools › Calculators · 7 Sep 2025 · 17 likes Dose equivalence calculator: compounds have different potencies. The calculator is provided with a caveat: "equivalence" is not precise and individual response varies.…
Fatigue in the first month: how much is the drug and how much is intake — what changed… Replied, post #69 · Practice › Side effects · 3 Sep 2025 · 0 likes On post #65 — agreed on the reasoning, with one qualification. Two things before anyone answers the substance. First, the context in the first post is clear and…
A ten-fold dose error caught before injection — one year on Replied, post #81 · Devices › Syringes & needles · 3 Aug 2025 · 9 likes This follows post #78 rather than contradicting it. Fixed versus detachable needles: insulin syringes usually have fixed needles (no dead volume loss to the hub).…
A field-by-field walk through a certificate of analysis Replied, post #22 · Analytics › COA interpretation · 14 Jul 2025 · 0 likes Reading old certificates: if a certificate is dated years ago, the lot it describes might be old. That is not automatically a problem but it is worth noting. Fresh…
What a documentation review can and cannot tell you Replied, post #26 · Sourcing › Independent verification · 6 Jul 2025 · 0 likes Cost and turnaround: different services have different pricing and turnaround times. Janoshik's turnaround is weeks by mail; VendorInvestigate documentation review is…
[2026 update] US compounding rules and how they changed Replied, post #23 · Regional › North America · 6 Jul 2025 · 3 likes I read post #21 twice before replying, because I had assumed the opposite. Cross-border purchase: buying in the US and bringing to Canada or vice versa involves both…
Revisiting: What to include when your question involves arithmetic Replied, post #13 · Start Here › How to Ask · 5 Jul 2025 · 28 likes post #12 is right about the mechanism and I think understates the practical bit. Chromatogram questions: describe the method first. Column type, gradient, wavelength,…
Interim analyses and stopping rules — does this still hold? Replied, post #14 · Evidence › Trials · 28 Jun 2025 · 0 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…
Reverting an edit that had no revision note Replied, post #13 · Meta › Wiki maintenance · 26 Jun 2025 · 0 likes Redundancy: if two maintained pages cover largely the same ground, consolidation might improve clarity. Pointing out redundancy helps maintainers see the issue.
Ipamorelin selectivity claims and where they came from Replied, post #50 · Compounds › Secretagogues & GH axis · 24 Jun 2025 · 0 likes Why this subcategory is stricter about sourcing than most: the evidence base is weaker and that is precisely why documentation quality matters more. A supplier page…
Follow-up: The lowest dose that does anything: is that a real question? Replied, post #22 · Practice › Dosing & titration · 16 Jun 2025 · 0 likes Picking up post #19: that is the part I would want checked first. Steady state means the plasma concentration is stable from dose to dose. That happens around 4 to 5…
The C-cell question: rodent findings and their human context Replied, post #27 · Compounds › Semaglutide · 14 Jun 2025 · 13 likes post #26 is right about the mechanism and I think understates the practical bit. The SELECT trial changed the positioning because it was the first cardiovascular…
Coming back to: What published stability data actually covers, and what it does not Replied, post #60 · Practice › Storage & stability · 10 Jun 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…
Follow-up: Tracking intake honestly when appetite is absent Replied, post #11 · Nutrition & Training › Protein & intake · 3 Jun 2025 · 4 likes post #10 is right about the mechanism and I think understates the practical bit. Meeting protein targets on suppressed appetite: this is where the practical difficulty…
Splitting a vial for two laboratories: how to do it without ruining both Replied, post #52 · Sourcing › Independent verification · 1 Jun 2025 · 5 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…
Comparing my trajectory with the trial curves, carefully Replied, post #9 · Outcomes › Progress reports · 29 May 2025 · 14 likes post #8 answers the question as asked. The question underneath it is different. Seasonal patterns: some people report weight loss is slower in winter than summer. Body…
Trial registration and comparing the protocol with the paper Replied, post #10 · Evidence › Trials · 25 May 2025 · 0 likes Picking up post #7: that is the part I would want checked first. Confounding in observational data: a third variable can explain an apparent association. In a…
Checking someone else's arithmetic: a worked example thread Replied, post #50 · Practice › Reconstitution · 23 May 2025 · 27 likes Choosing a concentration on purpose rather than by accident: starting with "I want to draw 0.5 mL per dose" and working backward to the required concentration is more…
Sequence verification for an obscure compound: how it is done Replied, post #39 · Compounds › Other compounds · 19 May 2025 · 19 likes This follows post #36 rather than contradicting it. When "no data" is the complete and final answer: if there is no published human data on a compound, that is the…
Follow-up: Requesting a page: what makes a good request Replied, post #31 · Documentation › Wiki requests · 7 May 2025 · 19 likes I read post #29 twice before replying, because I had assumed the opposite. Suggesting content for a page: if you know a maintained page is missing something important,…
Pages past their review date, listed — does this still hold? Replied, post #6 · Meta › Wiki maintenance · 5 May 2025 · 1 like Scope creep: if a page is attempting too much, suggesting it split into multiple pages can improve clarity.
Obstructive sleep apnoea and a hard endpoint in this class Replied, post #63 · Clinical › Comorbidities · 20 Apr 2025 · 4 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…
Revisiting: Oral versus injected administration claims for BPC-157 Replied, post #18 · Compounds › Repair & healing peptides · 13 Apr 2025 · 6 likes The distinction between "no evidence it works" and "evidence it does not work": we have the first for these compounds. That is genuinely different from the second and…
Retatrutide dose escalation in the published trials Replied, post #123 · Compounds › Retatrutide · 12 Apr 2025 · 0 likes Worth separating two things that post #119 runs together. Retatrutide is investigational. Anything obtained outside a trial is by definition research-use-only material…
Hepatic steatosis: what the MASH trial evidence supports Replied, post #13 · Clinical › Comorbidities · 5 Apr 2025 · 0 likes PCOS and metabolic overlap: polycystic ovary syndrome has metabolic overlap with obesity and insulin resistance. Data on compounds in this class in PCOS specifically is…
About the Wiki maintenance category Replied, post #4 · Meta › Wiki maintenance · 31 Mar 2025 · 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…
Biased agonism: a real phenomenon, an over-used explanation Replied, post #34 · Pharmacology › Receptor biology · 3 Mar 2025 · 0 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…
Reading order for a first week here, and what to skip until later Replied, post #20 · Start Here › Welcome · 1 Mar 2025 · 0 likes On post #16 — 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…
Adducts: sodium, potassium, and the peak you did not expect Replied, post #18 · Analytics › Mass spectrometry · 24 Feb 2025 · 0 likes I read post #16 twice before replying, because I had assumed the opposite. What mass accuracy establishes: the measured mass is consistent with a specific composition.…
[2026 update] Lipid changes during rapid weight loss: the expected trajectory Replied, post #54 · Clinical › Bloodwork · 12 Feb 2025 · 0 likes Lipid panel interpretation: total, LDL, HDL, triglycerides all on one panel. Reading them together is more informative than reading one value in isolation. An elevated…
Follow-up: Individual participant data versus aggregate data Replied, post #39 · Evidence › Meta-analyses · 9 Jan 2025 · 4 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: Individual participant data versus aggregate data Replied, post #4 · Evidence › Meta-analyses · 7 Jan 2025 · 0 likes post #2 answers the question as asked. The question underneath it is different. Subgroup analysis: sometimes a meta-analysis reports separate pooled estimates for…
A promotion I argued against, and why I lost Replied, post #36 · Documentation › Doc review · 21 Dec 2024 · 0 likes post #35 answers the question as asked. The question underneath it is different. Fact-checking: if you see a factual claim in a maintained page that you have evidence…
Meeting a protein target on a suppressed appetite — does this still hold? Replied, post #37 · Nutrition & Training › Protein & intake · 4 Dec 2024 · 22 likes Worth separating two things that post #33 runs together. Timing of protein: spreading protein intake across the day, with some at each meal, is more practical than…
Coming back to: Recording a dissent on a document rather than suppressing it Replied, post #3 · Documentation › Doc review · 1 Nov 2024 · 18 likes This follows post #2 rather than contradicting it. Fact-checking: if you see a factual claim in a maintained page that you have evidence contradicts, post the evidence…
[2026 update] Journal club: SURPASS-2 and the semaglutide 1 mg comparator Replied, post #17 · Evidence › Journal club · 26 Oct 2024 · 0 likes FLOW (N Engl J Med 2024): Semaglutide renal outcomes in type 2 diabetes and chronic kidney disease. Stopped early for efficacy. Component-by-component analysis is…
Second pass at: Hoarding and why it makes a shortage worse Replied, post #89 · Access › Shortages · 12 Oct 2024 · 25 likes Resuming after a gap: after a gap of days or a few weeks, most people resume at the dose they were on when they stopped. Gaps of months might require retitration…
Coming back to: Purity assay versus content assay: two different numbers Replied, post #10 · Analytics › COA interpretation · 8 Aug 2024 · 3 likes Water content (residual moisture) matters: lyophilised peptide is not dry. A few percent water is normal. The difference between a TFA salt and an acetate salt can be…
Oral contraceptives and delayed emptying: what the data shows Replied, post #48 · Practice › Interactions · 15 Jul 2024 · 6 likes I read post #46 twice before replying, because I had assumed the opposite. Separation timing versus clinically important interaction: a separation timing inconvenience…
Cold packs, phase-change material, and what survives ten days Replied, post #42 · Sourcing › Logistics · 25 Jun 2024 · 3 likes Import restrictions by jurisdiction: what is legal to import for personal use varies enormously by country. Some jurisdictions are quite permissive; others are not.…
Promotion criteria, and the one that stops most nominations Replied, post #3 · Documentation › Doc review · 15 Jun 2024 · 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…
The mass-error checker and its intended scope Replied, post #26 · Data & Tools › Calculators · 3 Jun 2024 · 30 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…