e.coelho

TL2 · Rennes

Contributes reviews on supplier material. Based in Rennes.

Joined 11 January 2025 · last posted 21h

85 posts, newest first. Showing up to 150.

Revisiting: Spike-and-recover accuracy for a peptide assay Replied, post #3 · Analytics › Method validation · 27 Jul 2026 · 33 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…
Transit times by route, from a logged dataset Replied, post #21 · Sourcing › Logistics · 20 Jul 2026 · 2 likes Everything in post #17 holds. The case it does not cover is the one I have. Peak periods and public holidays affect this more than any other factor and are entirely…
Review: a draft on reconstitution arithmetic, with objections — what changed since Replied, post #46 · Documentation › Doc review · 20 Jul 2026 · 1 like Post #42 put the caveat in the right place and I want to underline it. Where content is lifted from a topic, attribution should be in the document rather than only in…
Submitting a sample: the process end to end Replied, post #94 · Sourcing › Independent verification · 19 Jul 2026 · 26 likes Picking up post #91: that is the part I would want checked first. Repeat determination on the same product line months apart is the measurement that speaks to…
What to bring: records that a clinician can actually use — a second dataset Replied, post #38 · Clinical › Prescriber conversations · 15 Jul 2026 · 2 likes Preparing for an appointment: bring recent bloodwork, a list of current medications with doses and timing, and any questions written out. Written questions get better…
Prescription portability between countries Replied, post #97 · Access › International · 13 Jul 2026 · 0 likes One more thing on prescription portability between countries that took me far too long to see: the two figures people quote are not measuring the same quantity. Once…
Ultrasound and skinfolds: operator dependence in practice Replied, post #55 · Outcomes › Body composition · 12 Jul 2026 · 0 likes Bone mineral density changes with substantial weight loss are measurable and slow, and are one of the better reasons to have a baseline scan. It is the sort of thing…
The anatomy of a question that gets answered within an hour — does this still hold? Replied, post #11 · Start Here › How to Ask · 10 Jul 2026 · 9 likes A photograph of a vial is rarely useful and a photograph of a document usually is. Redact the identifiers before you post either.
A supplier who responds to a discrepancy with silence — what changed since Replied, post #77 · Sourcing › Red flags · 8 Jul 2026 · 3 likes The most useful reply I ever got about supplier was a request to state my units. It sounds like pedantry and it has saved me twice.
Common supplements people ask about, assessed one at a time Replied, post #15 · Practice › Interactions · 6 Jul 2026 · 6 likes The arithmetic in post #12 is right; the assumption feeding it is the part to check. Where a published interaction study exists it usually reports an area-under-curve…
CJC-1295 with and without DAC: what the modification does Replied, post #92 · Compounds › Secretagogues & GH axis · 23 Jun 2026 · 1 like Confirming post #91 from a second method, which matters more than confirming it from a second person. Effects reported at the level of appetite are the most…
Completing a dose with a second syringe, and the dead-volume arithmetic Replied, post #56 · Practice › Administration · 16 Jun 2026 · 1 like Narrowing post #53, because the general version has more than one answer. I would keep completing a dose and the decision it usually gets used for separate in this…
Stability of BPC-157 in solution: what has been measured — one year on Replied, post #72 · Compounds › Repair & healing peptides · 14 Jun 2026 · 21 likes Post #69 is the version of this I will quote in future. One addition. The absence of adequately powered published randomised human trials is the central fact about…
[2026 update] Does a peptide degrade silently, with no visual change? Replied, post #68 · Practice › Storage & stability · 2 Jun 2026 · 0 likes Since peptide keeps coming up, it should probably be a maintained page rather than a recurring thread. I am happy to draft it if someone with more direct experience…
[2026 update] Reading a chromatogram someone posted without axes Replied, post #2 · Analytics › HPLC & UHPLC · 30 May 2026 · 27 likes The opening post put the caveat in the right place and I want to underline it. This is why a purity figure without the underlying chromatogram is weaker evidence than…
A fridge failure and how I assessed the contents afterwards Replied, post #12 · Devices › Cold chain · 30 May 2026 · 9 likes I had read the opposite somewhere and cannot now find where, which tells me something.
Reading a home test result without over-claiming Replied, post #59 · Analytics › Home & field testing · 29 May 2026 · 0 likes Anything that changes colour is measuring a reaction, and reactions have interferents. A positive result in the presence of an excipient you did not expect is not…
Follow-up: Tirzepatide and nausea: is the profile genuinely different or just… Replied, post #100 · Compounds › Tirzepatide · 28 May 2026 · 26 likes This settles it for me, at least until somebody posts a reason it should not.
Travelling with an injectable: documentation and practicalities Replied, post #28 · Access › International · 19 May 2026 · 0 likes Where a compound is approved under a different trade name in another market, searching the local name finds documents the English name does not.
Reading a trial's population section before its results Replied, post #18 · Evidence › Trials · 13 May 2026 · 0 likes The estimand: what the trial set out to estimate. Two trials can be identical in structure but estimate different things by using different handling rules for people…
Official shortage notices and what they authorise Replied, post #27 · Access › Shortages · 30 Apr 2026 · 10 likes Managing an unplanned gap: if a shortage causes a gap in treatment, the questions are how long the gap will be and how that affects your condition. Discussing with your…
Personal or family history of medullary thyroid carcinoma — what changed since Replied, post #15 · Safety › Contraindications · 20 Apr 2026 · 11 likes Answering the question post #14 raises rather than the one it answers. Allergy to the specific compound: true allergy is rare but possible. Any prior allergic reaction…
List price versus negotiated price versus what you pay Replied, post #36 · Access › Pricing · 11 Apr 2026 · 28 likes Nothing here is financial advice and none of it is a route to a transaction. It took me longer than it should have to see that.
Five questions in one post gets you one answer — how to split them Replied, post #40 · Start Here › How to Ask · 26 Mar 2026 · 11 likes Picking up post #37: that is the part I would want checked first. Five questions is one of those subjects where the general answer and the answer for a specific case…
[2026 update] Distinguishing expected GI effects from something that needs urgent… Replied, post #9 · Practice › Side effects · 18 Mar 2026 · 4 likes The relationship between symptom burden and outcome is not what people assume. Feeling worse is not evidence of a larger effect and feeling nothing is not evidence of…
Contributing data without breaching anyone's privacy Replied, post #68 · Data & Tools › Datasets · 6 Mar 2026 · 6 likes Independent test results are the most valuable data this community collects, and they are only comparable when the method is captured alongside the number.
Measurement error in a self-reported exposure Replied, post #126 · Evidence › Study critique · 28 Feb 2026 · 28 likes That is a fair summary of where the discussion has got to.
What a certificate commits its issuer to — one year on Replied, post #23 · Analytics › COA interpretation · 26 Feb 2026 · 0 likes Confirming post #22 from a second method, which matters more than confirming it from a second person. A chromatogram supplied as a small image is legible for peak shape…
Foaming during reconstitution and whether it matters — the long version Replied, post #43 · Practice › Reconstitution · 23 Feb 2026 · 0 likes Everything in post #41 holds. The case it does not cover is the one I have. Foaming during reconstitution sits at the boundary between what this community can usefully…
The 2.5 mg starting dose is not a therapeutic dose — why that matters Replied, post #24 · Compounds › Tirzepatide · 23 Feb 2026 · 2 likes Post #21 answers the question as asked. The question underneath it is different. Research-use-only tirzepatide is not approved for human use and is not made to…
Mass error in ppm: the arithmetic and the caveat Replied, post #22 · Analytics › Mass spectrometry · 12 Feb 2026 · 0 likes Adding a data point of agreement rather than a data point.
Second pass at: The topic list is dense — is that deliberate? Replied, post #68 · Meta › Site feedback · 10 Feb 2026 · 6 likes That is clearer than the version I had in my head. Thank you.
Second pass at: Pregnancy and pregnancy planning: contraindication and washout Replied, post #30 · Clinical › Special populations · 22 Jan 2026 · 17 likes Pregnancy and pregnancy planning: 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…
Muscle cramps: the ordinary causes before the exotic ones Replied, post #91 · Practice › Side effects · 21 Jan 2026 · 0 likes Nothing in this subcategory is medical advice, and the specific cases where that matters most are the ones where somebody is deciding whether a symptom is worth a…
Designing a personal experiment that could change your mind Replied, post #2 · Research Methods › N-of-1 designs · 13 Jan 2026 · 0 likes Measure the same thing the same way at the same time of day. Most of the noise in personal data is measurement protocol rather than biology.
Aggregates and why a purity assay may miss them entirely Replied, post #64 · Analytics › Impurities & related substances · 10 Jan 2026 · 0 likes This follows post #62 rather than contradicting it. Speaking only to aggregates as I have actually seen it, rather than as it is usually described: the effect is real,…
[2026 update] Reading a supplementary appendix and finding the interesting part Replied, post #7 · Evidence › Trials · 9 Jan 2026 · 0 likes Adding thanks rather than a view. I do not have a view worth the space.
Distinguishing expected GI effects from something that needs urgent attention Replied, post #56 · Practice › Side effects · 8 Jan 2026 · 0 likes On post #52 — agreed on the reasoning, with one qualification. The published rates come from populations that were titrated on a defined schedule with clinical…
Realistic expectations for strength while losing weight quickly Replied, post #46 · Nutrition & Training › Resistance training · 20 Dec 2025 · 30 likes This is the answer, and the reason it is the answer is the more useful part.
Personal import allowances, compared — a second dataset Replied, post #33 · Access › International · 8 Dec 2025 · 26 likes A note on scope: what I am saying about Personal import allowances applies to the case in the first post and I would not extend it further without checking.
A parcel that arrived warm: a decision process, not a verdict Replied, post #138 · Practice › Storage & stability · 14 Nov 2025 · 4 likes Building on post #136 rather than restating it. Visible particulate is a strong signal in the other direction: it is a reason to stop and ask rather than to filter and…
EMA product information as a primary source Replied, post #29 · Regional › European Union · 3 Nov 2025 · 0 likes Reimbursement is decided nationally and varies substantially between member states for the same authorised product.
Coverage in the US: a map of the usual obstacles Replied, post #6 · Regional › North America · 31 Oct 2025 · 5 likes Cost comparisons should state whether they include the device and the dispensing fee, because those differ between routes and between states.
SURMOUNT-4 and what withdrawal data does and does not tell an individual — one year on Replied, post #99 · Compounds › Tirzepatide · 23 Oct 2025 · 2 likes On post #97 — agreed on the reasoning, with one qualification. SURMOUNT-4 used a randomised withdrawal design: everyone titrated, then those on maintenance were…
MHRA statements, read directly Replied, post #13 · Regional › UK & Ireland · 9 Oct 2025 · 0 likes The arithmetic in post #11 is right; the assumption feeding it is the part to check. The most useful thing anyone has posted about MHRA statements in this category was…
Why catalogue breadth is not evidence of anything — what changed since Replied, post #64 · Compounds › Other compounds · 5 Oct 2025 · 32 likes This subcategory exists because some people will research compounds outside the main groups discussed here. The standard of evidence and honesty about its limits…
Promotion criteria, and the one that stops most nominations — the long version Replied, post #56 · Documentation › Doc review · 12 Sep 2025 · 12 likes Right, and stated more narrowly than I would have dared to state it.
[2026 update] A single out-of-range value on an otherwise normal panel Replied, post #7 · Clinical › Bloodwork · 26 Aug 2025 · 23 likes Narrowing post #6, because the general version has more than one answer. Nothing in this subcategory is medical advice, and a panel with an unexpected result is…
Subcutaneous absorption kinetics and site differences Replied, post #20 · Pharmacology › Pharmacokinetics · 4 Aug 2025 · 6 likes Confirming post #17 from a second method, which matters more than confirming it from a second person. Metabolism for peptide drugs is proteolytic rather than hepatic in…
Reaching a dose and staying there for a year: a longitudinal note — does this still hold? Replied, post #19 · Practice › Dosing & titration · 31 Jul 2025 · 24 likes The four-week escalation interval is a convention from the pivotal trials, not a pharmacological constant. The pharmacological argument is that with a week-long…
Travel coolers and how long they really hold Replied, post #11 · Devices › Cold chain · 31 Jul 2025 · 0 likes The most useful thing anyone has posted about travel coolers in this category was a table of what had been measured and by whom. That is what I would want again.
How to research a compound with no human data without deceiving yourself Replied, post #18 · Compounds › Other compounds · 30 Jul 2025 · 1 like Anyone submitting an unusual compound for testing should tell the laboratory what it is rather than what it is sold as. Method selection depends on the structure and…
Semaglutide versus liraglutide head to head: reading STEP 8 carefully Replied, post #31 · Compounds › Semaglutide · 23 Jul 2025 · 0 likes Taking semaglutide versus liraglutide seriously for a moment rather than deflecting: the honest position is that the community has observations and no controlled…
Coming back to: When "no data" is the complete and final answer Replied, post #39 · Compounds › Other compounds · 9 Jul 2025 · 15 likes Confirming post #36 from a second method, which matters more than confirming it from a second person. When "no data" is the complete and final answer: if there is no…
Forced degradation studies: designing one that is informative — does this still hold? Replied, post #20 · Analytics › Method validation · 21 Jun 2025 · 0 likes Forced degradation studies was covered in the wiki last year and the page has a review date on it, which is a better starting point than my memory of a thread.
High-resolution MS on aggregates and what it can see Replied, post #5 · Analytics › Mass spectrometry · 12 Jun 2025 · 1 like 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.
What the GIP component of tirzepatide is thought to contribute, and how confident we can… Replied, post #4 · Compounds › Tirzepatide · 11 Jun 2025 · 0 likes Storage and stability: published data on licensed tirzepatide formulations exists and is worth reading directly rather than through summarised claims. Reconstituted…
Validating a calculator against hand arithmetic — what changed since Replied, post #122 · Data & Tools › Calculators · 9 Jun 2025 · 0 likes Marking my place. If it changes for me I will come back and say so.
Albumin binding and how it produces a long half-life Replied, post #44 · Pharmacology › Pharmacokinetics · 3 Jun 2025 · 4 likes Post #41 is right about the mechanism and I think understates the practical bit. Reading this albumin binding thread as someone who came in with a fixed view: the third…
Coming back to: What published stability data actually covers, and what it does not Replied, post #47 · Practice › Storage & stability · 23 May 2025 · 10 likes Nothing to add on the substance. Thank you for taking the question at face value.
A 5 mg vial and a 0.25 mg dose: the arithmetic in full — the long version Replied, post #92 · Practice › Reconstitution · 29 Apr 2025 · 0 likes Picking up post #91: that is the part I would want checked first. Reconstituting a multi-strength kit: if a kit contains 5 mg, 10 mg, 15 mg vials and you are…
Second pass at: Pen dose counters: what a click does and does not guarantee Replied, post #24 · Devices › Pens & autoinjectors · 23 Apr 2025 · 28 likes A pen that has been dropped may not be visibly damaged and may not deliver accurately afterwards. Manufacturers say to replace rather than to test, and there is no test…
Revisiting: Why I ask for the gradient before I discuss the number Replied, post #4 · Analytics › HPLC & UHPLC · 21 Apr 2025 · 0 likes Clear enough that I do not think I have a follow-up, which is unusual.
Why we hide unevidenced fraud accusations and log the hiding Replied, post #83 · Sourcing › Red flags · 20 Apr 2025 · 10 likes Where somebody posts a concern, ask what would resolve it before arguing about it. Half of these threads end with a document nobody had asked for. Two sources, same…
Cost per milligram, computed honestly across formats — the long version Replied, post #66 · Access › Pricing · 15 Apr 2025 · 25 likes The most useful pricing posts here are the ones that show the arithmetic rather than the conclusion.
Coverage for the indication versus for the drug Replied, post #22 · Access › Insurance & coverage · 7 Apr 2025 · 26 likes What I want from this coverage thread is the list of things that would need to be true for the claim to hold. If we can write that list, we can check it.
A certificate with no method stated: what can you conclude? Replied, post #27 · Analytics › COA interpretation · 4 Apr 2025 · 9 likes Everything in post #25 holds. The case it does not cover is the one I have. An itemised related-substances table with retention times says considerably more about the…
Requesting a page: what makes a good request Replied, post #37 · Documentation › Wiki requests · 28 Mar 2025 · 13 likes Flag a page that has drifted: if you notice a maintained page has information that is outdated (dates that have passed, regulatory changes, new evidence) post a flag so…
One lot is one lot: when a report becomes a pattern — the long version Replied, post #7 · Sourcing › Vendor reports · 14 Mar 2025 · 1 like The format we ask for is compound, lot, testing service, method as reported, result, and the certificate figure for the same lot. A report missing any of those goes to…
Reading order for a first week here, and what to skip until later Replied, post #8 · Start Here › Welcome · 18 Feb 2025 · 21 likes That is a cleaner way of putting what I was circling around.
Distinguishing a deletion sequence by mass alone Replied, post #79 · Analytics › Mass spectrometry · 12 Feb 2025 · 0 likes I think the distinguishing a deletion sequence question is answerable and has not been answered, which is a more optimistic position than most of this thread.
Anaesthesia and elective surgery: the aspiration question — does this still hold? Replied, post #20 · Practice › Interactions · 27 Jan 2025 · 3 likes Noted, and thank you for writing it out rather than summarising it.
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly Replied, post #8 · Compounds › Tirzepatide · 21 Jan 2025 · 3 likes Comparisons between the tirzepatide and semaglutide programmes across trials rather than within one are weak. Different populations, different durations, different…
Biased agonism: a real phenomenon, an over-used explanation — what changed since Replied, post #12 · Pharmacology › Receptor biology · 26 Dec 2024 · 3 likes Everything in post #10 holds. The case it does not cover is the one I have. Counterpoint on Biased agonism, offered without confidence: the same observation is…
Molecular mass of semaglutide and why the figure differs between sources — does this… Replied, post #41 · Compounds › Semaglutide · 21 Dec 2024 · 25 likes Post #40 is right about the mechanism and I think understates the practical bit. Reframing Molecular mass of semaglutide slightly, because I think the disagreement is…
TB-500 and thymosin beta-4: the fragment versus the protein — does this still hold? Replied, post #18 · Compounds › Repair & healing peptides · 15 Dec 2024 · 4 likes Adding the boring version of TB-500 and thymosin beta-4, because the interesting version keeps getting posted and the boring one is usually right. Check the ordinary…
Washout with a one-week half-life: the arithmetic Replied, post #74 · Research Methods › N-of-1 designs · 6 Dec 2024 · 0 likes Post #72 put the caveat in the right place and I want to underline it. Reading back through the washout threads from last year, the same three questions come up every…
Reading a supplementary appendix and finding the interesting part Replied, post #36 · Evidence › Trials · 3 Dec 2024 · 0 likes What I would check first on reading a supplementary appendix is whether the thing being measured moved or whether the way of measuring it moved. Those look identical in…
What we do not know about retatrutide, listed explicitly Replied, post #8 · Compounds › Retatrutide · 30 Nov 2024 · 13 likes The arithmetic in post #7 is right; the assumption feeding it is the part to check. Nausea and vomiting were dose-related in the phase 2 work, as they are throughout…
Reading a preclinical wound-healing model and its relevance to a human tendon Replied, post #139 · Compounds › Repair & healing peptides · 24 Nov 2024 · 10 likes The preclinical work is genuinely interesting and it is preclinical. A rodent tendon model is a model of a rodent tendon, and the translation record from that kind of…
Athletes in weight-category sports: a different risk calculus — a second dataset Replied, post #19 · Clinical › Special populations · 17 Nov 2024 · 9 likes Reading back through the Athletes in weight-category sports threads from last year, the same three questions come up every time and only one of them has ever been…
Taste changes and food aversion, reported and discussed Replied, post #40 · Practice › Side effects · 13 Nov 2024 · 18 likes Adding the measurement that post #39 says would settle it. Agreed on taste changes and food aversion, with one qualification that I think matters. The reasoning holds…
The C-cell question: rodent findings and their human context — what changed since Replied, post #49 · Compounds › Semaglutide · 12 Sep 2024 · 13 likes Worth separating c-cell question as a question about the compound from c-cell question as a question about the documentation. They get answered by different people and…
Second pass at: Sodium, potassium and magnesium when intake drops Replied, post #4 · Nutrition & Training › Hydration & electrolytes · 17 Jul 2024 · 0 likes Very low total intake produces multiple simultaneous deficiencies rather than one, which is why single-nutrient reasoning goes wrong here.
The mass-error checker and its intended scope Replied, post #112 · Data & Tools › Calculators · 10 Jul 2024 · 0 likes Mass error checking: enter your observed mass and theoretical mass and check whether the difference in ppm is within reasonable bounds for your instrument. Useful…