p.fontaine

TL2 · Lyon

Contributes reviews on supplier material. Based in Lyon.

Joined 19 January 2025 · last posted 4d

86 posts, newest first. Showing up to 150.

Follow-up: Signs of dehydration worth acting on Replied, post #36 · Safety › Adverse events · 24 Jul 2026 · 8 likes The published trial rates come from supervised populations on defined schedules and are not comparable to rates derived from who chooses to post.
Follow-up: How compounding permissions changed when supply normalised Replied, post #59 · Sourcing › Regulatory · 23 Jul 2026 · 2 likes Narrowing post #57, because the general version has more than one answer. The confident answers on compounding permissions and the well-sourced answers are not the same…
[2026 update] Regional warehouse stock versus direct despatch Replied, post #142 · Sourcing › Logistics · 21 Jul 2026 · 24 likes Worth stating the null on Regional warehouse stock versus direct before we explain it: the observation may be nothing. That possibility deserves a sentence and usually…
[2026 update] Detection wavelength and why 214 nm and 280 nm disagree Replied, post #45 · Analytics › HPLC & UHPLC · 17 Jul 2026 · 6 likes Counterpoint on Detection wavelength, offered without confidence: the same observation is consistent with a much duller explanation, and nobody has ruled the dull one…
Insurance and replacement policies, compared Replied, post #92 · Sourcing › Logistics · 16 Jul 2026 · 3 likes One caution on insurance and replacement policies: everything above assumes the underlying documentation is what it claims to be. That assumption is doing real work and…
The anatomy of a question that gets answered within an hour Replied, post #113 · Start Here › How to Ask · 15 Jul 2026 · 1 like Post the arithmetic you already did. Half the questions here are answered by someone spotting which line of your working is wrong, and that is impossible if you only…
What a certificate commits its issuer to Replied, post #25 · Analytics › COA interpretation · 13 Jul 2026 · 20 likes Post #23 put the caveat in the right place and I want to underline it. A chromatogram supplied as a small image is legible for peak shape and not for baseline detail.…
Second pass at: Absence of evidence and evidence of absence Replied, post #41 · Research Methods › Statistics · 9 Jul 2026 · 3 likes Absence of statistical significance is not evidence of absence, particularly in a small study. The width of the interval tells you what was ruled out and the p-value…
What a certificate commits its issuer to Replied, post #7 · Analytics › COA interpretation · 9 Jul 2026 · 10 likes Endotoxin testing is separate: a certificate of purity says nothing about endotoxin. A chemically pure preparation can carry a clinically significant endotoxin load. If…
Revisiting: Protein density versus volume when you cannot eat much Replied, post #40 · Nutrition & Training › Protein & intake · 7 Jul 2026 · 0 likes Where somebody reports losing strength, intake and training stimulus are the first two things to look at rather than the compound.
Prescription portability between countries Replied, post #88 · Access › International · 5 Jul 2026 · 32 likes Post #85 answers the question as asked. The question underneath it is different. On prescription portability between countries: the maintained page in the documentation…
Coming back to: A community side-effect dataset, with its response rate and biases Replied, post #90 · Data & Tools › Datasets · 3 Jul 2026 · 1 like I would put moderate confidence on the mainstream reading of community side-effect dataset and no more. That is not scepticism for its own sake; it is where the…
The anatomy of a question that gets answered within an hour Replied, post #98 · Start Here › How to Ask · 2 Jul 2026 · 8 likes Coming back to post #94, because the follow-up matters more than the original answer. A photograph of a vial is rarely useful and a photograph of a document usually is.…
Travelling with an injectable: documentation and practicalities Replied, post #37 · Access › International · 30 Jun 2026 · 21 likes Nothing here is legal advice, and in this subcategory that caveat is doing real work rather than sitting decoratively at the end.
Revisiting: Journal club: SURMOUNT-OSA and a hard endpoint in a soft field Replied, post #69 · Evidence › Journal club · 30 Jun 2026 · 22 likes I read post #68 twice before replying, because I had assumed the opposite. The baseline characteristics table is the single most useful page for the questions that get…
What a reversed-phase purity number actually is Replied, post #10 · Analytics › HPLC & UHPLC · 29 Jun 2026 · 10 likes Building on post #8 rather than restating it. Detection wavelength: 214 nm detects the peptide bond and is relatively insensitive to composition. 280 nm detects…
Hair shedding at month three: mechanism and time course — the long version Replied, post #35 · Practice › Side effects · 26 Jun 2026 · 17 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…
[2026 update] Does a peptide degrade silently, with no visual change? Replied, post #77 · Practice › Storage & stability · 22 Jun 2026 · 0 likes Post #75 put the caveat in the right place and I want to underline it. Visible particulate is a strong signal in the other direction: it is a reason to stop and ask…
What I would want from a home test that does not exist yet Replied, post #13 · Analytics › Home & field testing · 17 Jun 2026 · 26 likes Adding the measurement that post #12 says would settle it. False positives and false negatives: no test has 100% sensitivity and 100% specificity. A negative result…
Pooling trials with different estimands Replied, post #22 · Evidence › Meta-analyses · 13 Jun 2026 · 9 likes Where the included trials share a sponsor and a protocol template, their errors correlate and pooling does not average them out. The short version is the first…
Reading a home test result without over-claiming Replied, post #77 · Analytics › Home & field testing · 13 Jun 2026 · 30 likes The arithmetic in post #74 is right; the assumption feeding it is the part to check. Precision of home tests: most consumer-accessible devices are not precise to the…
Washout with a one-week half-life: the arithmetic — does this still hold? Replied, post #20 · Research Methods › N-of-1 designs · 25 May 2026 · 0 likes Multiple outcomes measured without a primary one means something will move. Nominate the primary in advance and report the rest as secondary. That is the version I…
Reference intervals: how they are constructed and why one in twenty flags Replied, post #100 · Clinical › Bloodwork · 20 May 2026 · 14 likes The strongest argument against my own position on reference intervals, stated as well as I can state it, since nobody else has yet.
The "under review" status pill and when a moderator applies it Replied, post #120 · Evidence › Preprints · 7 May 2026 · 8 likes If you cite a preprint in a maintained document here, the convention is to label it in the sentence and to note the check date. The document review will catch the update.
Second pass at: Which categories are strict and which are relaxed, honestly Replied, post #46 · Start Here › Welcome · 25 Apr 2026 · 7 likes The Lounge is a real category rather than a dumping ground. The sourcing rule still applies there, which surprises people, but the register is looser and nobody minds a…
[2026 update] Storing lyophilised material long term: what governs the shelf life Replied, post #95 · Practice › Storage & stability · 8 Apr 2026 · 0 likes Adding what did not work for me on Storing lyophilised material long term, since the failures never get written up and they are half the useful information.
Journal club: LEADER as the historical anchor Replied, post #57 · Evidence › Journal club · 8 Apr 2026 · 15 likes Post #54 answers the question as asked. The question underneath it is different. If you are new and reading this thread for the answer to LEADER: the answer is…
Revisiting: Drawing up with one needle and injecting with another Replied, post #28 · Practice › Administration · 3 Apr 2026 · 29 likes Useful. I had the fact and not the reason, which turns out to be the important half.
Revisiting: Drawing up with one needle and injecting with another Replied, post #3 · Practice › Administration · 31 Mar 2026 · 1 like Bleeding at the site is common and unremarkable at these needle gauges. Persistent bruising in the same area repeatedly is worth a change of technique or of site rather…
Second pass at: When your prescriber and the evidence disagree Replied, post #4 · Clinical › Prescriber conversations · 25 Mar 2026 · 21 likes The failure mode on prescriber is boring rather than dramatic. It is almost always the step everyone assumes was done correctly because it is too simple to get wrong.
Second pass at: What "verified" means on our vendor pages, stated narrowly Replied, post #85 · Sourcing › Vendor reports · 24 Mar 2026 · 0 likes Photograph the vial and the label before opening. It costs ten seconds and it is what turns a report into something checkable.
Journal club: the CagriSema phase 2 combination paper Started this topic · Evidence › Journal club · 15 Mar 2026 · 0 likes On the subject in the title: Journal club: the CagriSema phase 2 combination paper Working notes rather than a conclusion. CagriSema phase 2 combination paper — I have…
Half-life, steady state, and accumulation worked through — a second dataset Replied, post #101 · Pharmacology › Pharmacokinetics · 8 Mar 2026 · 12 likes Speaking only to Half-life as I have actually seen it, rather than as it is usually described: the effect is real, it is smaller than the thread suggests, and the…
Revisiting: Maintainer handover: how it works Replied, post #27 · Meta › Wiki maintenance · 3 Mar 2026 · 1 like Coming back to post #25, because the follow-up matters more than the original answer. Where I have landed on Maintainer handover, having got it wrong once in public:…
Pharmacy supply in the UK and the questions you will be asked Replied, post #60 · Regional › UK & Ireland · 2 Mar 2026 · 4 likes Pharmacy supply is a question about a distribution, not about a value, and treating it as a value is what produces the confident wrong answers.
[2026 update] Storing lyophilised material long term: what governs the shelf life Replied, post #74 · Practice › Storage & stability · 1 Mar 2026 · 0 likes Storing lyophilised material long term sits at the boundary between what this community can usefully discuss and what it cannot, and I think it falls on the discussable…
Measurement error in a self-reported exposure Replied, post #6 · marked as the solution · Evidence › Study critique · 21 Feb 2026 · 25 likes Distinguishing three things in the measurement error discussion that keep getting used interchangeably: the observation, the proposed mechanism, and the recommendation…
AOD-9604 and the fragment hypothesis, revisited — does this still hold? Replied, post #4 · Compounds › Other compounds · 11 Feb 2026 · 0 likes Whatever the answer on AOD-9604 turns out to be, the method for getting there is the same: state the assumption, do the arithmetic in public, invite the correction.
Warfarin and altered intake: the monitoring argument — the long version Replied, post #100 · Practice › Interactions · 29 Jan 2026 · 31 likes A supplement is a drug for interaction purposes, and the fact that it is sold without a prescription tells you nothing about whether it interacts. The paperwork is…
Common supplements people ask about, assessed one at a time — a second dataset Replied, post #35 · Practice › Interactions · 14 Jan 2026 · 3 likes My experience of Common supplements contradicts the reply above. I am posting it as a data point rather than as a refutation, because one person's experience is exactly…
Where impurities in solid-phase peptide synthesis come from Replied, post #31 · Analytics › Impurities & related substances · 1 Jan 2026 · 0 likes An honest declaration on impurities in solid-phase peptide synthesis: I have a prior here and it is strong enough that you should weight what I say downward. Stating it…
Vomiting: when it is expected and when it is a reason to stop Replied, post #70 · Practice › Side effects · 28 Dec 2025 · 23 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 headache that turns out to be dehydration Replied, post #94 · Nutrition & Training › Hydration & electrolytes · 14 Dec 2025 · 8 likes A definition problem is doing most of the work in this headache discussion. Once the term is pinned down I suspect the disagreement mostly goes away and what is left is…
Angle of injection and whether 90 degrees is always right Replied, post #54 · Practice › Administration · 22 Nov 2025 · 4 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. I keep…
What a purity-only report leaves out Replied, post #79 · Sourcing › Independent verification · 9 Nov 2025 · 14 likes If you are new and reading this thread for the answer to purity-only: the answer is conditional, the conditions are in the third reply, and the rest of the thread is…
Where to report an adverse event officially, by region — a second dataset Replied, post #98 · Safety › Adverse events · 6 Nov 2025 · 9 likes Narrowing post #95, because the general version has more than one answer. The most useful contribution to this subcategory is a completed account: what happened, what…
EMA product information as a primary source Replied, post #36 · Regional › European Union · 6 Nov 2025 · 0 likes EMA is the regulator with national implementation. Licensed incretin analogues are prescription-only across the EU, with some variation in specific approvals by member…
Documentation that materially improves an appeal's chances Replied, post #52 · Access › Insurance & coverage · 5 Nov 2025 · 0 likes Summarising the documentation thread so far, since it is long and the answer is buried: the first reply has the method, the fourth has the correction to it, and the…
How to read a forest plot, properly, from scratch Replied, post #50 · Evidence › Trials · 4 Nov 2025 · 0 likes Post #49 answers the question as asked. The question underneath it is different. Risk of bias: structured appraisal of internal validity. Key things to assess:…
A 40-week log with the measurement method stated Replied, post #81 · Outcomes › Progress reports · 27 Oct 2025 · 0 likes State the method before the numbers. Same scale, same time of day, same conditions — without that a series is a collection of readings rather than a measurement. I…
A checklist for reading a certificate in under two minutes — does this still hold? Replied, post #51 · Analytics › COA interpretation · 1 Oct 2025 · 0 likes Where two documents for the same lot disagree, the useful question is which was measured and which was transcribed. Most such disagreements are the second. Adding the…
Trust level 3 requirements: a clarification Replied, post #10 · Meta › Announcements · 30 Sep 2025 · 28 likes I would put moderate confidence on the mainstream reading of trust level 3 requirements and no more. That is not scepticism for its own sake; it is where the sourcing…
Freeze-thaw and why one cycle is not the same as five Replied, post #4 · Practice › Storage & stability · 22 Sep 2025 · 0 likes Understood. Thank you for being specific about the limits of it.
A 10 mg vial reconstituted three different ways, compared — the long version Replied, post #98 · Practice › Reconstitution · 2 Aug 2025 · 0 likes Concentration is total mass divided by total volume, and everything else follows from that. Ten milligrams into two millilitres is five milligrams per millilitre, and…
Random versus fixed effects: choosing rather than defaulting Replied, post #14 · Evidence › Meta-analyses · 30 Jun 2025 · 2 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…
The CagriSema phase 2 paper and what a fixed combination buys — the long version Replied, post #151 · Compounds › Cagrilintide & amylin analogues · 20 Jun 2025 · 3 likes Agreed, and I will stop repeating the version of this I had been repeating.
Follow-up: Tracking intake honestly when appetite is absent Replied, post #61 · Nutrition & Training › Protein & intake · 11 Jun 2025 · 9 likes Having read the whole Tracking intake thread before replying: the question in the first post has not actually been answered yet, and three of us have answered a nearby…
Second pass at: Triple agonism: additive, synergistic, or neither? Replied, post #54 · Compounds › Retatrutide · 22 May 2025 · 3 likes Same experience here, different supplier, so it is at least not unique to one of them.
DXA precision and the least significant change for lean mass — the long version Replied, post #38 · Outcomes › Body composition · 13 May 2025 · 0 likes Post #36 is right about the mechanism and I think understates the practical bit. Where a scan disagrees with the mirror over a short period, the scan's precision limits…
Coming back to: Cross-border purchase rules within the EU Replied, post #4 · Regional › European Union · 2 May 2025 · 0 likes Netherlands: CBG-MEB implements framework. GPs are first point of contact. Insurance coverage for weight management is conditional on structured lifestyle programme…
Titles that describe the question, not the situation Started this topic · Start Here › How to Ask · 20 Apr 2025 · 43 likes Titles that describe the question, not the situation — setting out what I have, and where I think it stops being reliable. A narrow question about titles, deliberately…
Retatrutide dose escalation in the published trials Replied, post #137 · Compounds › Retatrutide · 15 Apr 2025 · 6 likes Why this subcategory is more cautious than elsewhere: retatrutide is investigational, phase 3 is ongoing, and the heart-rate signal in phase 2 is not negligible.…
What a 2 ppm match establishes, and what it does not Replied, post #9 · Analytics › Mass spectrometry · 3 Apr 2025 · 5 likes Post #8 is the version of this I will quote in future. One addition. The reason 2 ppm match keeps being re-asked is that the answer is conditional and people quote it…
An orphaned page with no inbound links Replied, post #24 · Meta › Wiki maintenance · 2 Apr 2025 · 13 likes Scope creep: if a page is attempting too much, suggesting it split into multiple pages can improve clarity. Speaking for myself and not for anyone else who has posted…
Certificates issued by the seller versus by a laboratory Replied, post #21 · Analytics › COA interpretation · 28 Mar 2025 · 0 likes This follows post #18 rather than contradicting it. An itemised related-substances table with retention times says considerably more about the synthesis than a single…
Splitting a vial for two laboratories: how to do it without ruining both Replied, post #7 · Sourcing › Independent verification · 22 Mar 2025 · 2 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…
Charge states for a 4 kDa peptide, worked through Replied, post #24 · Analytics › Mass spectrometry · 5 Mar 2025 · 1 like Quantitation by MS: most quantitation is done by LC-UV detection at 214 nm, not by MS, because extinction coefficients are better known. MS can quantify if an internal…
Fibre intake when total intake falls, and the constipation link Replied, post #35 · Nutrition & Training › Protein & intake · 3 Mar 2025 · 2 likes Renal considerations around higher protein intake apply to people with existing renal impairment and are frequently generalised beyond that population. This has been…
Biased agonism: a real phenomenon, an over-used explanation Replied, post #22 · Pharmacology › Receptor biology · 28 Feb 2025 · 0 likes I read post #20 twice before replying, because I had assumed the opposite. Receptor occupancy required for a clinical effect is not the same as full occupancy, and…
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly Replied, post #27 · Compounds › Tirzepatide · 24 Feb 2025 · 23 likes On post #23 — agreed on the reasoning, with one qualification. Gastrointestinal effects were comparable in character to the GLP-1 monoagonists across the programme.…
[2026 update] Sulphur-smelling eructation: mechanism and what helps Started this topic · Practice › Side effects · 12 Feb 2025 · 10 likes Posting this under the heading it deserves: Sulphur-smelling eructation: mechanism and what helps Everything below is what sits behind that. I was wrong about…
Distinguishing a deletion sequence by mass alone Replied, post #69 · Analytics › Mass spectrometry · 10 Feb 2025 · 0 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.
What the published dose-response for semaglutide actually looks like above 2.4 mg — a… Replied, post #46 · Compounds › Semaglutide · 31 Jan 2025 · 18 likes Agreed on published dose-response for semaglutide, with one qualification that I think matters. The reasoning holds for the case as described. Change the starting…
Second pass at: Historical amylin analogues and what happened to them Replied, post #3 · Compounds › Cagrilintide & amylin analogues · 3 Jan 2025 · 0 likes I read the opening post twice before replying, because I had assumed the opposite. Historical amylin analogues: pramlintide was the only long-acting amylin analogue…
What changed in 2026, by region Replied, post #44 · Access › International · 28 Dec 2024 · 14 likes Where a jurisdiction has published guidance for clinicians, that document usually answers the practical questions better than any consumer-facing page. I would put a…
Follow-up: Dead volume across syringe and needle combinations Replied, post #81 · Devices › Syringes & needles · 13 Dec 2024 · 0 likes Check what the graduations actually say rather than what you expect. A syringe marked in units and one marked in millilitres look similar at a glance and are not the…
Follow-up: Dead volume across syringe and needle combinations Replied, post #62 · Devices › Syringes & needles · 8 Nov 2024 · 18 likes The most useful thing anyone has posted about Dead volume across syringe in this category was a table of what had been measured and by whom. That is what I would want…
Hypertension improvement and when medication needs revisiting — a second dataset Replied, post #84 · Clinical › Comorbidities · 23 Oct 2024 · 0 likes A condition that affects nutrition or absorption changes the calculus around a treatment that reduces intake, and that interaction is mostly unstudied.
Second pass at: Hoarding and why it makes a shortage worse Replied, post #99 · Access › Shortages · 12 Oct 2024 · 9 likes The published shortage register maintained by the national regulator is the authoritative source here, and it is updated far more often than any thread. That is the…
Journal club: SURPASS-2 and the semaglutide 1 mg comparator Replied, post #66 · Evidence › Journal club · 7 Oct 2024 · 0 likes Everything in post #62 holds. The case it does not cover is the one I have. Practical note on SURPASS-2: write down what you expect before you look. The number of times…
Revisiting: Melanocortin agonists: mechanism and the documented adverse profile Replied, post #20 · Compounds › Other compounds · 27 Sep 2024 · 5 likes Adding the measurement that post #17 says would settle it. The honest summary for most of this subcategory: a plausible mechanism, animal data, and first-hand accounts.…
A rising related-substance total over six months: degradation or method drift? Replied, post #39 · Analytics › Impurities & related substances · 6 Sep 2024 · 11 likes I would rather this thread reach "we do not know" about rising related-substance than reach a confident answer that nobody can support when asked.
High-resolution MS on aggregates and what it can see — one year on Replied, post #40 · Analytics › Mass spectrometry · 18 Aug 2024 · 0 likes Post #38 describes the usual case. This is about the unusual one. The version of High-resolution that circulates here is a simplification of a simplification. It is not…
Journal club: FLOW and the renal composite, component by component Replied, post #91 · Evidence › Journal club · 18 Jul 2024 · 0 likes The most common failure mode is spending fifty minutes on the effect size and ten on the population. Reversing that ratio would improve most sessions.
Oral contraceptives and delayed emptying: what the data shows Replied, post #32 · Practice › Interactions · 12 Jul 2024 · 2 likes Confirming post #30 from a second method, which matters more than confirming it from a second person. The reason oral contraceptives and delayed emptying keeps being…
Identical chromatograms across two different lots Replied, post #3 · Sourcing › Red flags · 3 Jul 2024 · 1 like Before the thread moves on from identical chromatograms — what is the sample size behind the claim? I am not being difficult; I have seen the same figure quoted from an…