c.bakker

TL2 · Basel

Contributes reviews on supplier material. Based in Basel.

Joined 9 January 2025 · last posted 2d

89 posts, newest first. Showing up to 150.

Revisiting: What pooling buys you and what it destroys Replied, post #107 · Evidence › Meta-analyses · 26 Jul 2026 · 24 likes Study quality and weighting: some meta-analyses weight all studies equally; others weight by study size or study quality. The choice affects the result and should be…
Second pass at: Sleep apnoea improving and the equipment implications Replied, post #91 · Wellbeing › Sleep · 21 Jul 2026 · 0 likes Good question, well framed, and I would like to see it answered properly.
What a certificate commits its issuer to Replied, post #59 · Analytics › COA interpretation · 19 Jul 2026 · 17 likes Following this. I have the same question and no better information than the first post.
[2026 update] Waist circumference technique and its repeatability Replied, post #25 · Outcomes › Progress reports · 16 Jul 2026 · 5 likes Reframing Waist circumference technique slightly, because I think the disagreement is about the question rather than the answer. If the question is "does it happen",…
What a reversed-phase purity number actually is Replied, post #49 · Analytics › HPLC & UHPLC · 13 Jul 2026 · 19 likes My understanding of reversed-phase purity number is a few years old and may have been superseded. If it has been, I would genuinely like to know rather than keep…
Publication patterns in the BPC-157 literature, examined Replied, post #30 · Compounds › Repair & healing peptides · 7 Jul 2026 · 0 likes Dose-response is unstudied in humans for essentially everything in this family, which means the confident numbers in circulation came from somewhere other than a trial.…
Semaglutide and gastric emptying — the mechanism behind most of the side-effect profile Replied, post #94 · Compounds › Semaglutide · 7 Jul 2026 · 12 likes The question underneath semaglutide and gastric emptying is usually "how would I tell?" rather than "what is true?", and that one has a method attached to it. Write…
Specificity, linearity, accuracy, precision, range, robustness — with real criteria Replied, post #39 · Analytics › Method validation · 5 Jul 2026 · 1 like Range: the concentration range over which the method has been validated. Going outside the validated range is going outside the method's demonstrated performance.
Why retatrutide discussion here is more cautious than elsewhere — one year on Replied, post #28 · Compounds › Retatrutide · 30 Jun 2026 · 4 likes Triple agonism: is the effect additive, synergistic, or neither? A phase 2 comparison of tirzepatide (dual) to retatrutide (triple) would answer that question. The…
Secretagogues and glucose tolerance: the mechanistic concern Replied, post #52 · Compounds › Secretagogues & GH axis · 27 Jun 2026 · 15 likes Building on post #50 rather than restating it. A mass result for a short peptide is more discriminating than for a long one, because a single residue difference is a…
Submitting a sample: the process end to end Replied, post #27 · Sourcing › Independent verification · 20 Jun 2026 · 1 like Submitting a sample looks different depending on whether you are reading the primary literature or the summaries of it, and the difference is not in our favour.
Manufacturer assistance programmes and their eligibility rules Replied, post #34 · Access › Pricing · 15 Jun 2026 · 2 likes The most useful pricing posts here are the ones that show the arithmetic rather than the conclusion. I looked this up rather than remembered it, which is the right order.
Racemisation and why it is invisible to a mass measurement Replied, post #30 · Analytics › Impurities & related substances · 10 Jun 2026 · 0 likes Where I part company with post #28, and it is a narrow parting. Incomplete deprotection: mass higher by the protecting group mass. Usually markedly later eluting. A…
Revisiting: What pooling buys you and what it destroys Replied, post #42 · Evidence › Meta-analyses · 3 Jun 2026 · 3 likes I had written a reply contradicting post #39 and deleted it. Here is what survived. For anyone finding this later: the short answer on pooling buys is that it depends…
Personal or family history of medullary thyroid carcinoma — what changed since Replied, post #39 · Safety › Contraindications · 15 May 2026 · 9 likes Coming back to post #35, because the follow-up matters more than the original answer. Somebody's condition being on a list does not settle the decision, and somebody's…
Injection volume, overload, and peak distortion Replied, post #4 · Analytics › HPLC & UHPLC · 11 May 2026 · 27 likes Answering the question post #2 raises rather than the one it answers. Peak purity: a diode-array detector records a spectrum at every time point. If a peak contains two…
When a dose reduction is the correct response to a side effect Replied, post #19 · Practice › Dosing & titration · 10 May 2026 · 1 like This settles it for me, at least until somebody posts a reason it should not.
Transporting a vial for a weekend away — a second dataset Replied, post #19 · Practice › Storage & stability · 2 Apr 2026 · 6 likes Two questions I would want answered before drawing anything from the Transporting a vial data above: how were the cases selected, and what happened to the ones that…
Residual solvents and scavengers: what is looked for — what changed since Replied, post #21 · Analytics › Impurities & related substances · 28 Mar 2026 · 19 likes The most useful reply I ever got about Residual solvents and scavengers was a request to state my units. It sounds like pedantry and it has saved me twice.
Introducing myself: pharmacist, sceptic, reluctant participant — one year on Replied, post #74 · Lounge › Introductions · 15 Mar 2026 · 21 likes Good to have another set of eyes on the wiki posts. Community wiki editing is open at trust level three and the queue of small corrections is permanently longer than…
Which fields on a certificate actually matter, ranked Replied, post #4 · Analytics › COA interpretation · 10 Mar 2026 · 0 likes Check the lot on the vial against the lot on the document before anything else. It is the cheapest check available and it is the one that catches the mismatches that…
Reading a preclinical wound-healing model and its relevance to a human tendon — a second… Replied, post #24 · Compounds › Repair & healing peptides · 10 Mar 2026 · 4 likes I changed my mind about Reading a preclinical wound-healing model after someone here asked me for the source and I could not produce one. That is worth saying out loud…
Why the titration planner refuses to produce a schedule below a floor Replied, post #44 · Data & Tools › Calculators · 28 Feb 2026 · 11 likes I read the earlier replies on titration planner refuses twice before writing this, because I had assumed the opposite and wanted to be sure I was disagreeing with what…
The most common factual error about semaglutide on the internet — what changed since Replied, post #37 · Compounds › Semaglutide · 27 Feb 2026 · 0 likes This follows post #34 rather than contradicting it. The STEP programme populations were selected: enrollment criteria required baseline body mass index over 30, no…
Second pass at: Identical chromatograms across two different lots Replied, post #30 · Sourcing › Red flags · 27 Feb 2026 · 7 likes Worth separating two things that post #28 runs together. The question underneath Identical chromatograms is usually "how would I tell?" rather than "what is true?", and…
Pinch or no pinch, and how needle length changes the answer — the long version Replied, post #24 · Practice › Administration · 26 Feb 2026 · 0 likes If you have to inject at a different time of day than usual, that is a much smaller perturbation than it feels for a weekly compound with a week-long half-life.
Measurement error in a self-reported exposure Replied, post #59 · Evidence › Study critique · 24 Feb 2026 · 24 likes Post #57 describes the usual case. This is about the unusual one. Counterpoint on measurement error, offered without confidence: the same observation is consistent with…
Seven-day rolling means and why weekly readings mislead — one year on Replied, post #66 · Outcomes › Progress reports · 16 Feb 2026 · 0 likes I read post #63 twice before replying, because I had assumed the opposite. Measurement noise: day-to-day body mass varies by more than a kilogram on hydration,…
IGF-1 as a surrogate endpoint and its limitations Replied, post #8 · Compounds › Secretagogues & GH axis · 16 Feb 2026 · 1 like Confirming post #5 from a second method, which matters more than confirming it from a second person. IGF-1 as a surrogate: it is a better integrated measure than a spot…
Citation sweep results: how many references did not say what was claimed Replied, post #40 · Meta › Wiki maintenance · 3 Feb 2026 · 30 likes Reframing citation sweep results slightly, because I think the disagreement is about the question rather than the answer. If the question is "does it happen", yes. If…
Why catalogue breadth is not evidence of anything Started this topic · Compounds › Other compounds · 21 Jan 2026 · 9 likes Why catalogue breadth is not evidence of anything I have a specific reason for asking rather than idle curiosity, and the context is below. What changes if the standard…
Distinguishing expected GI effects from something that needs urgent attention Replied, post #87 · Practice › Side effects · 13 Jan 2026 · 9 likes Tracking severity on a simple scale with dates is far more useful than describing it afterwards. Memory smooths a symptom curve into a story that fits what you expected.
Injection discomfort: needle gauge, volume, temperature, technique Replied, post #12 · Practice › Administration · 6 Jan 2026 · 0 likes Useful. I have added it to my own notes with the date on it.
Filter needles: when they help and what they cost you Replied, post #19 · Devices › Syringes & needles · 5 Jan 2026 · 0 likes Post #15 put the caveat in the right place and I want to underline it. U-100 means the barrel is graduated for a solution containing one hundred units of insulin per…
Prescription requirements and telehealth models Replied, post #93 · Sourcing › Regulatory · 26 Dec 2025 · 31 likes Taking post #90 at face value and following it one step further. Where a claim about legality is made here, the useful follow-up is which instrument it rests on. Most…
Specificity, linearity, accuracy, precision, range, robustness — with real criteria — a… Replied, post #49 · Analytics › Method validation · 22 Dec 2025 · 21 likes Reporting a result to more decimal places than the method's precision supports is a small dishonesty that appears everywhere. A method with a two per cent relative…
Price changes over 2025 and 2026, tabulated and dated — does this still hold? Replied, post #39 · Access › Pricing · 17 Dec 2025 · 5 likes Price changes came up in a thread eighteen months ago and was answered well. I cannot find it, which is itself the problem, so here is the reconstruction.
Tracking that stops updating and then resumes — the long version Replied, post #51 · Sourcing › Logistics · 14 Dec 2025 · 0 likes Confirming post #48 from a second method, which matters more than confirming it from a second person. Import restrictions by jurisdiction: what is legal to import for…
Retatrutide's phase 2 heart-rate signal and how to think about it Replied, post #17 · Compounds › Retatrutide · 3 Dec 2025 · 7 likes TRIUMPH is phase 3 and it is ongoing. No phase 3 results exist. Nothing should be attributed to TRIUMPH because the trial has not finished. When it does, this page will…
Coming back to: Feature request: should a dose-equivalence tool exist at all? Replied, post #19 · Data & Tools › Calculators · 26 Nov 2025 · 18 likes Post #18 is the version of this I will quote in future. One addition. I would be cautious about generalising from the Feature request example above. It is a good…
Detection wavelength and why 214 nm and 280 nm disagree Replied, post #81 · Analytics › HPLC & UHPLC · 13 Nov 2025 · 2 likes Detection at 214 nanometres sees the peptide bond and therefore sees almost everything peptidic. At 280 it sees aromatic residues, so a peptide without tryptophan or…
Shoulders, tangent skims, and defensible integration — the long version Replied, post #2 · Analytics › HPLC & UHPLC · 11 Nov 2025 · 2 likes Where the Shoulders reasoning breaks down for me is the step from the group result to the individual case. That step is almost never argued for.
Oral versus injectable exposure: comparing apples to a different fruit Replied, post #3 · Compounds › Oral incretins · 28 Oct 2025 · 0 likes Taking the oral product with more water than instructed reduces absorption rather than helping it. That is counter-intuitive and it is one of the few dosing…
Reading SURMOUNT-1 without the press release Replied, post #41 · Compounds › Tirzepatide · 22 Oct 2025 · 10 likes Building on post #40 rather than restating it. Categorical response thresholds — the proportion reaching ten, fifteen or twenty per cent reduction — are more persuasive…
How to read a phase 2 result without treating it as a phase 3 result — what changed since Replied, post #9 · Compounds › Retatrutide · 12 Oct 2025 · 0 likes Phase 2 sample sizes are not adequate for safety characterisation of a novel triple agonist. Phase 3 is where that question gets answered. Using phase 2 results to make…
Coming back to: Where the integrator drew the baseline, and how much it moved the number Replied, post #8 · Analytics › HPLC & UHPLC · 22 Sep 2025 · 21 likes Two sentences on integrator and then I will stop, because the rest is speculation and the thread is better without mine. What is documented is narrow. What is inferred…
Follow-up: Why the titration planner refuses to produce a schedule below a floor Replied, post #119 · Data & Tools › Calculators · 17 Sep 2025 · 17 likes A tool that refuses to give an answer when the result falls below one graduation is doing something useful. Most just print the number.
Reverse causation in a cohort study of weight and outcome — a second dataset Replied, post #65 · Evidence › Study critique · 14 Sep 2025 · 0 likes Reading back through the Reverse causation threads from last year, the same three questions come up every time and only one of them has ever been answered properly.…
Titles that describe the question, not the situation — what changed since Replied, post #7 · Start Here › How to Ask · 10 Sep 2025 · 24 likes If someone has run Titles properly I would rather read that than my own reconstruction of it. Posting mine only because the thread has gone quiet.
When a tidy document is a signal and when it is decoration — does this still hold? Replied, post #6 · Analytics › COA interpretation · 24 Aug 2025 · 4 likes Clear enough that I do not think I have a follow-up, which is unusual.
Meeting a protein target on a suppressed appetite Replied, post #17 · Nutrition & Training › Protein & intake · 23 Aug 2025 · 0 likes Taking post #14 at face value and following it one step further. Density matters more than quantity when total intake is limited. The same protein in a smaller volume…
Power cut for eleven hours: how I assessed it afterwards Replied, post #31 · Practice › Storage & stability · 22 Aug 2025 · 18 likes Visible particulate is a strong signal in the other direction: it is a reason to stop and ask rather than to filter and proceed.
Hypertension improvement and when medication needs revisiting Replied, post #16 · Clinical › Comorbidities · 20 Aug 2025 · 3 likes Coming back to post #13, because the follow-up matters more than the original answer. Checked the hypertension improvement claim against the primary source this…
When a preprint is the best available evidence and we say so Replied, post #55 · Evidence › Preprints · 14 Aug 2025 · 10 likes Everything in post #54 holds. The case it does not cover is the one I have. Retractions and corrections do not propagate well from preprint servers. A citation that was…
BPC-157: what the rodent literature actually shows, and what it does not — a second… Replied, post #83 · Compounds › Repair & healing peptides · 13 Aug 2025 · 2 likes Adding the measurement that post #82 says would settle it. The version of BPC-157 that circulates here is a simplification of a simplification. It is not wrong, but it…
How to research a compound with no human data without deceiving yourself Replied, post #107 · Compounds › Other compounds · 4 Aug 2025 · 23 likes On post #103 — agreed on the reasoning, with one qualification. Thymosin alpha-1 has a regulatory history in several jurisdictions and a real clinical literature, which…
Coming back to: Sample size calculations, read backwards from the published number Replied, post #59 · Evidence › Trials · 19 Jul 2025 · 0 likes Post #55 put the caveat in the right place and I want to underline it. Something worth flagging about Sample size calculations: the strongest-sounding claims in this…
Coming back to: Amylin analogue mechanism: satiety signalling separate from GLP-1 Replied, post #8 · Compounds › Cagrilintide & amylin analogues · 18 Jul 2025 · 12 likes Post #5 and I disagree about the size of the effect, not about the direction. What is genuinely unknown about long-term amylin agonism: real-world response rates,…
Angle of injection and whether 90 degrees is always right Started this topic · Practice › Administration · 10 Jul 2025 · 8 likes On the subject in the title: Angle of injection and whether 90 degrees is always right Working notes rather than a conclusion. Something about angle of injection does…
Repeatability versus intermediate precision Replied, post #121 · Analytics › Method validation · 2 Jul 2025 · 0 likes Limits of detection and quantitation: LOD is the lowest concentration that produces a signal above background. LOQ is the lowest concentration at which the method meets…
TB-500 and thymosin beta-4: the fragment versus the protein Replied, post #51 · Compounds › Repair & healing peptides · 26 Jun 2025 · 17 likes Adding the measurement that post #50 says would settle it. I would be cautious about generalising from the TB-500 and thymosin beta-4 example above. It is a good…
Coming back to: Semaglutide half-life: where the 165 to 184 hour figure comes from Replied, post #41 · Compounds › Semaglutide · 25 Jun 2025 · 0 likes On alcohol: the labelling does not contraindicate it, but it raises gastric irritation risk and semaglutide already does that. There is no published interaction study…
Journal club: SURMOUNT-1, read without the press release Replied, post #142 · Evidence › Journal club · 21 Jun 2025 · 10 likes People arriving without having read it should be welcome and should say so, because a question from someone who has not read it frequently exposes an assumption…
Reading an MS report that only gives you a single number Replied, post #110 · Analytics › Mass spectrometry · 17 Jun 2025 · 0 likes Resolution and mass accuracy are different specifications. An instrument can resolve two species and still assign their masses imprecisely, and the reverse is also…
Revisiting: Why a compound being unapproved is not the same as being illegal to possess Replied, post #11 · Sourcing › Regulatory · 25 May 2025 · 0 likes I have been on both sides of the compound being unapproved argument in this category within eighteen months, which should tell you how strong the evidence for either…
Which panel is worth repeating and which is worth ignoring Replied, post #12 · Clinical › Bloodwork · 2 May 2025 · 26 likes Where a panel includes a calculated value, that value inherits the imprecision of everything it was calculated from and is usually reported without an interval.
Splitting a vial for two laboratories: how to do it without ruining both Replied, post #27 · Sourcing › Independent verification · 26 Apr 2025 · 2 likes Trying to state the splitting a vial position in a way that someone who disagrees would recognise as fair, because I do not think the version in this thread passes that…
Dizziness on standing: the ordinary explanation first Replied, post #9 · Nutrition & Training › Hydration & electrolytes · 24 Apr 2025 · 0 likes Commercial rehydration formulations are designed for a specific purpose and are not equivalent to a sports drink, whatever the marketing suggests. Not a strong opinion,…
Why fasting instructions for oral semaglutide are not optional advice — does this still… Replied, post #21 · Compounds › Oral incretins · 21 Apr 2025 · 17 likes On variability: the between-person spread in exposure for oral semaglutide is wide enough that two people on the same dose can have quite different plasma…
Obstructive sleep apnoea and a hard endpoint in this class Replied, post #56 · Clinical › Comorbidities · 12 Apr 2025 · 0 likes Taking post #55 at face value and following it one step further. Nobody has said the unglamorous part of obstructive sleep apnoea yet, so: most of the variation is…
Adducts: sodium, potassium, and the peak you did not expect Replied, post #58 · Analytics › Mass spectrometry · 6 Apr 2025 · 15 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…
Follow-up: Tesamorelin has an approved indication — what that changes about the evidence Replied, post #37 · Compounds › Secretagogues & GH axis · 5 Apr 2025 · 9 likes Worth separating two things that post #35 runs together. The most useful single question to ask about any compound in this family is what the published human evidence…
Maintainer handover: how it works Replied, post #41 · Meta › Wiki maintenance · 16 Mar 2025 · 21 likes Narrowing post #38, because the general version has more than one answer. Revision disputes: if you disagree with an edit a maintainer made, discussing it here invites…
Journal club: SUSTAIN 6 and its retinopathy signal — does this still hold? Replied, post #56 · Evidence › Journal club · 14 Mar 2025 · 0 likes Worth separating two things that post #54 runs together. Where the group cannot agree, record the disagreement rather than resolving it by seniority. The recorded…
Coverage for the indication versus for the drug — a second dataset Replied, post #12 · Access › Insurance & coverage · 11 Mar 2025 · 11 likes What I would tell a new member reading about Coverage for the first time: the confident posts are not the reliable ones, and the reliable ones are longer.
Revisiting: Bug report: the reconstitution calculator and a rounding edge case Replied, post #114 · Data & Tools › Calculators · 4 Mar 2025 · 17 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…
The CagriSema phase 2 paper and what a fixed combination buys Replied, post #5 · Compounds › Cagrilintide & amylin analogues · 27 Jan 2025 · 0 likes Amylin signalling is distinct from GLP-1 signalling. Amylin slows gastric emptying and promotes satiety through a different receptor and different neural pathways. The…
Follow-up: Tirzepatide's shorter half-life and its one practical consequence Replied, post #138 · Compounds › Tirzepatide · 9 Jan 2025 · 2 likes Post #135 is the version of this I will quote in future. One addition. Tirzepatide's half-life of roughly five days means steady state is approached in about three…
Second pass at: A field-by-field walk through a certificate of analysis Replied, post #148 · Analytics › COA interpretation · 11 Dec 2024 · 21 likes No disagreement from me. Posting only so the question does not look ignored.
Revisiting: Moderation log format change Replied, post #55 · Meta › Announcements · 5 Dec 2024 · 11 likes Post #53 answers the question as asked. The question underneath it is different. Worth saying publicly: stepping back cleanly and handing over is a service. Documents…
Identical chromatograms across two different lots Replied, post #49 · Sourcing › Red flags · 14 Nov 2024 · 0 likes The number people quote for identical chromatograms is a central estimate presented without its interval, and the interval is wide enough that the estimate is nearly…
Time to steady state after a dose increase Replied, post #108 · Pharmacology › Pharmacokinetics · 5 Nov 2024 · 5 likes Appreciated. The plain phrasing does more work here than a longer post would.
Second pass at: Buffers, pH and why a formulation is a formulation Replied, post #23 · Pharmacology › Formulation chemistry · 27 Oct 2024 · 15 likes Excipients and their purposes: mannitol, sucrose, or other sugars in lyophilised formulations protect the peptide during drying and storage. They are not impurities;…
Progressive overload when the scale is falling — one year on Replied, post #112 · Nutrition & Training › Resistance training · 1 Oct 2024 · 0 likes Strength and hypertrophy respond to different things, and preserving one during a deficit is a different objective from building the other. The part I am sure of is…
Revisiting: How to bring a laboratory report to an appointment usefully Replied, post #24 · Clinical › Bloodwork · 12 Sep 2024 · 0 likes I have no financial interest in anything named in this thread and I want to say so before I comment on bring a laboratory, because it is the sort of subject where it…
[2026 update] People with a low starting BMI: where the evidence stops Replied, post #14 · Clinical › Special populations · 3 Sep 2024 · 7 likes Answering the question post #13 raises rather than the one it answers. People on multiple medicines are under-represented in trials by design, and that is the…
Correlation in a self-tracked dataset: what it can support Replied, post #85 · Research Methods › Statistics · 23 Aug 2024 · 4 likes P-values and significance: p A weak preference rather than a position.
Splitting a vial for two laboratories: how to do it without ruining both — what changed… Replied, post #4 · Sourcing › Independent verification · 17 Aug 2024 · 0 likes Adding a null result on Splitting a vial. I looked, carefully, and found nothing, and null results deserve posting precisely because they never are.
Coming back to: Purity assay versus content assay: two different numbers Replied, post #30 · Analytics › COA interpretation · 10 Aug 2024 · 0 likes This is the sort of exchange that makes the archive worth searching.