a.weiss

TL2 · Rennes

Contributes reviews on supplier material. Based in Rennes.

Joined 25 February 2025 · last posted 12h

90 posts, newest first. Showing up to 150.

Common supplements people ask about, assessed one at a time Replied, post #108 · Practice › Interactions · 27 Jul 2026 · 10 likes Clear enough that I do not think I have a follow-up, which is unusual.
Revisiting: Protein density versus volume when you cannot eat much Replied, post #102 · Nutrition & Training › Protein & intake · 24 Jul 2026 · 28 likes Meeting protein targets on suppressed appetite: this is where the practical difficulty lies. Eating more protein when appetite is suppressed is genuinely hard.…
Journal club: what we got wrong in an earlier session Replied, post #114 · Evidence › Journal club · 23 Jul 2026 · 23 likes Where the group cannot agree, record the disagreement rather than resolving it by seniority. The recorded disagreement is more honest and more useful later.
NHS criteria and how they are applied in practice Replied, post #37 · Regional › UK & Ireland · 21 Jul 2026 · 12 likes Regional variation in NHS: access varies dramatically by region depending on local commissioning decisions and specialist service availability. Postcode determines…
Coming back to: Telehealth prescribing models in the US Replied, post #23 · Regional › North America · 21 Jul 2026 · 15 likes Formulary position changes on a schedule that is published in advance, which means a decision made now may be answering last year's formulary. The claim is narrower…
Revisiting: Why the absence of controlled human data on BPC-157 matters more than people… Replied, post #42 · Compounds › Repair & healing peptides · 20 Jul 2026 · 16 likes Anecdote is the whole of the human evidence base here, and this community's convention is to say so rather than to aggregate anecdotes into something that sounds like…
Coming back to: Where the four-week escalation interval comes from, and what it is not Replied, post #36 · Practice › Dosing & titration · 20 Jul 2026 · 10 likes On four-week escalation interval: the maintained page in the documentation commons covers the general case with citations and a review date, which is more reliable than…
Journal club: SUSTAIN 6 and its retinopathy signal Replied, post #88 · Evidence › Journal club · 20 Jul 2026 · 0 likes Source for the SUSTAIN 6 figure, since it was asked for. It is in the discussion rather than the abstract, which is why the version circulating is stronger than the…
[2026 update] Antibiotics and a course of something with delayed emptying Replied, post #52 · Practice › Interactions · 16 Jul 2026 · 2 likes Picking up post #51: that is the part I would want checked first. A pharmacist can answer most questions in this subcategory in a few minutes with access to a proper…
[2026 update] Regional warehouse stock versus direct despatch Replied, post #134 · Sourcing › Logistics · 14 Jul 2026 · 11 likes Tracking stops updating: tracking last updated days ago usually means the package is in transit and will not update until it reaches the next scanning point. No update…
Micro-titration: a disputed topic, argued properly — one year on Replied, post #62 · Practice › Dosing & titration · 12 Jul 2026 · 6 likes On post #60 — agreed on the reasoning, with one qualification. The four-week step is a trial convention, not a pharmacological constant. It is roughly four half-lives…
Risk-of-bias tools and the judgement they conceal — does this still hold? Replied, post #25 · Evidence › Meta-analyses · 11 Jul 2026 · 0 likes What I would check first on Risk-of-bias tools is whether the thing being measured moved or whether the way of measuring it moved. Those look identical in a graph.
Aggregate verification data across the directory, with caveats Replied, post #32 · Sourcing › Independent verification · 6 Jul 2026 · 25 likes Adding thanks rather than a view. I do not have a view worth the space.
[2026 update] Area percent versus weight percent: the confusion that causes most arguments Replied, post #64 · Analytics › HPLC & UHPLC · 28 Jun 2026 · 22 likes Detection wavelength: 214 nm detects the peptide bond and is relatively insensitive to composition. 280 nm detects aromatic residues and is strongly…
Pooling trials with different estimands Replied, post #54 · Evidence › Meta-analyses · 28 Jun 2026 · 0 likes Narrowing post #53, because the general version has more than one answer. Individual participant data pooling is a much stronger design than aggregate pooling and is…
Insurance and replacement policies, compared Replied, post #38 · Sourcing › Logistics · 23 Jun 2026 · 0 likes Peak periods and public holidays affect this more than any other factor and are entirely predictable in advance.
Follow-up: Search filters: what is missing Replied, post #132 · Meta › Site feedback · 18 Jun 2026 · 1 like Following, with nothing to contribute beyond having asked the same thing elsewhere.
An appeal that succeeded, with the letter structure — the long version Replied, post #113 · Access › Insurance & coverage · 17 Jun 2026 · 17 likes I had written a reply contradicting post #111 and deleted it. Here is what survived. What I want from this appeal thread is the list of things that would need to be…
Coming back to: Specificity, linearity, accuracy, precision, range, robustness — with… Replied, post #51 · Analytics › Method validation · 12 Jun 2026 · 14 likes The version of Specificity that circulates here is a simplification of a simplification. It is not wrong, but it has lost the conditions under which it holds, and those…
Micronutrient adequacy at low total intake Replied, post #35 · Nutrition & Training › Protein & intake · 9 Jun 2026 · 0 likes Post #33 is the version of this I will quote in future. One addition. Leucine and MPS: leucine stimulates muscle protein synthesis at a threshold of roughly 2 to 3…
Angle of injection and whether 90 degrees is always right — the long version Replied, post #18 · Practice › Administration · 6 Jun 2026 · 6 likes Needle length matters less than angle for subcutaneous delivery in most people. A short needle at ninety degrees and a longer one at forty-five put the material in…
Alcohol: what is documented and what is folklore Replied, post #35 · Practice › Interactions · 31 May 2026 · 0 likes A methods point on alcohol rather than a substantive one: if the comparison is not like for like, the difference you are measuring is the difference in method.
Blind submission and why it changes minds — the long version Replied, post #93 · Sourcing › Independent verification · 23 May 2026 · 17 likes I keep a log for Blind submission specifically because my memory of it turned out to be systematically wrong in one direction. Six weeks of notes cost nothing and…
Comparing my trajectory with the trial curves, carefully — a second dataset Replied, post #46 · Outcomes › Progress reports · 17 May 2026 · 0 likes Seasonal patterns: some people report weight loss is slower in winter than summer. Body composition and activity changes might contribute. Noting the season is useful…
Blind submission and why it changes minds — the long version Replied, post #72 · Sourcing › Independent verification · 13 May 2026 · 0 likes Repeat testing: if you want to verify the same lot a second time, testing with a different service strengthens the conclusion. Testing with the same service verifies…
Prescription portability between countries Replied, post #30 · Access › International · 11 May 2026 · 1 like Compounding in different countries: some countries allow pharmacy compounding under defined conditions; others do not. The rules are jurisdiction-specific and change.
Request: show the solution author in the topic list — what changed since Replied, post #44 · Meta › Feature requests · 2 May 2026 · 12 likes Post #41 is right about the mechanism and I think understates the practical bit. Tradeoffs: every feature has a cost in maintenance and complexity. Acknowledging…
Search filters: what is missing Replied, post #50 · Meta › Site feedback · 24 Apr 2026 · 1 like Building on post #49 rather than restating it. Feature requests: if the site would work better with a feature it does not have (better search, different filtering, new…
Common supplements people ask about, assessed one at a time — a second dataset Replied, post #93 · Practice › Interactions · 24 Apr 2026 · 0 likes The most defensible general position in this subcategory: identify the plausible mechanism, check whether it has been studied, and where it has not, say that rather…
Rotating between abdomen, thigh and upper arm: absorption differences — one year on Replied, post #50 · Practice › Administration · 20 Apr 2026 · 12 likes I disagree with the framing of Rotating between abdomen above, and I think it is a substantive disagreement rather than a terminological one. Setting out why, so it can…
Coming back to: Specificity, linearity, accuracy, precision, range, robustness — with… Started this topic · Analytics › Method validation · 16 Apr 2026 · 0 likes On the subject in the title: Specificity, linearity, accuracy, precision, range, robustness — with real criteria Working notes rather than a conclusion. Trying to…
Journal club: is percentage weight change the right endpoint? Replied, post #70 · Evidence › Journal club · 15 Apr 2026 · 28 likes Adding the measurement that post #69 says would settle it. The figures usually contain the finding and the text usually contains the interpretation. Separating them for…
Manufacturer assistance programmes and their eligibility rules Replied, post #18 · Access › Pricing · 14 Apr 2026 · 18 likes Adding the measurement that post #16 says would settle it. Two people in this thread mean different things by manufacturer assistance programmes and are disagreeing…
Reconstitution volumes that produce round numbers, tabulated Replied, post #88 · Practice › Reconstitution · 11 Apr 2026 · 4 likes Adding the measurement that post #85 says would settle it. Source for the reconstitution volumes figure, since it was asked for. It is in the discussion rather than the…
Second pass at: Identical chromatograms across two different lots Replied, post #42 · Sourcing › Red flags · 4 Mar 2026 · 19 likes I have been on both sides of the Identical chromatograms argument in this category within eighteen months, which should tell you how strong the evidence for either side…
Measurement error in home scales, with a worked standard deviation Replied, post #13 · Research Methods › Statistics · 25 Feb 2026 · 7 likes Post #10 is right about the mechanism and I think understates the practical bit. On measurement error in home scales the community has more anecdote than the confidence…
[2026 update] A rising related-substance total over six months: degradation or method… Replied, post #45 · Analytics › Impurities & related substances · 16 Feb 2026 · 0 likes On post #41 — agreed on the reasoning, with one qualification. Nobody has said the unglamorous part of rising related-substance yet, so: most of the variation is…
Managing an unplanned gap in supply Replied, post #30 · Access › Shortages · 13 Feb 2026 · 0 likes Date any statement about supply. Positions change within weeks and the archive keeps posts permanently.
Second pass at: Adsorptive losses at low concentration, and why dilute solutions are… Replied, post #18 · Practice › Storage & stability · 14 Jan 2026 · 16 likes Seconded. It reads as careful rather than confident, which is the right register.
What a good consultation looks like from the other side Replied, post #7 · Clinical › Prescriber conversations · 1 Jan 2026 · 1 like Adding the measurement that post #4 says would settle it. Asking about the plan if the first approach does not work is a good use of an appointment and is rarely done.
Coming back to: Private prescribing in the UK: what is actually involved Replied, post #18 · Regional › UK & Ireland · 28 Dec 2025 · 0 likes Worth separating two things that post #16 runs together. One caution on Private prescribing: everything above assumes the underlying documentation is what it claims to…
What to include when your question involves a chromatogram Replied, post #5 · Start Here › How to Ask · 27 Dec 2025 · 2 likes Questions you cannot explain: "I cannot say why I am asking this, but is this compound stable at room temperature?" is more productive than no question at all. People…
Temperature loggers worth the money — the long version Replied, post #95 · Devices › Cold chain · 18 Dec 2025 · 13 likes Temperature loggers worth the money: I would want to see the raw numbers rather than the summary before agreeing. Summaries lose exactly the information that would…
Revisiting: Why tirzepatide titration schedules have more steps than semaglutide's Replied, post #73 · Compounds › Tirzepatide · 15 Nov 2025 · 7 likes Titration schedules for tirzepatide have more dose steps than semaglutide partly because the compound is more potent and partly because the clinical programme used a…
Request: a diff view for wiki revisions — the long version Replied, post #68 · Meta › Feature requests · 11 Nov 2025 · 15 likes Request with a caveat attached: a compare view for two vendor pages side by side. The caveat is that it would encourage exactly the ranking-by-number reading the pages…
The anatomy of a question that gets answered within an hour — the long version Replied, post #40 · Start Here › How to Ask · 30 Oct 2025 · 6 likes Where I part company with post #38, and it is a narrow parting. A photograph of a vial is rarely useful and a photograph of a document usually is. Redact the…
Where to report an adverse event officially, by region — a second dataset Replied, post #32 · Safety › Adverse events · 18 Oct 2025 · 0 likes The most useful contribution to this subcategory is a completed account: what happened, what was done, and what the outcome was. I have seen it go both ways, which is…
A 40-week log with the measurement method stated Replied, post #23 · Outcomes › Progress reports · 17 Oct 2025 · 3 likes Adding thanks rather than a view. I do not have a view worth the space.
Follow-up: Why the titration planner refuses to produce a schedule below a floor Replied, post #139 · Data & Tools › Calculators · 4 Oct 2025 · 6 likes I would be cautious about generalising from the titration planner refuses example above. It is a good example. It is one example.
Second pass at: Programming during a large energy deficit Replied, post #27 · Nutrition & Training › Resistance training · 4 Oct 2025 · 0 likes Programming during a large energy is worth one more sentence than it usually gets, and the sentence is the one about how the number was arrived at.
Cross-border purchase rules within the EU Replied, post #15 · Regional › European Union · 24 Sep 2025 · 10 likes I had written a reply contradicting post #11 and deleted it. Here is what survived. Two people in this thread mean different things by cross-border purchase rules…
High-resolution MS on aggregates and what it can see Replied, post #73 · Analytics › Mass spectrometry · 21 Sep 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. The…
A preprint whose numbers changed substantially at publication Replied, post #43 · Evidence › Preprints · 6 Sep 2025 · 7 likes Post #42 and I disagree about the size of the effect, not about the direction. Version numbers on a preprint server matter. Citing version one of something now on…
The nausea timeline across the first four weeks, with a tabulated log Replied, post #39 · Practice › Side effects · 5 Sep 2025 · 2 likes On nausea timeline I would separate what is worth knowing from what is worth acting on. The first list is long and the second is short, and conflating them is how…
Critiquing an observational claim about a class effect — one year on Replied, post #4 · Evidence › Study critique · 1 Sep 2025 · 0 likes The pre-specified endpoint being a weaker proxy than you would like is a real criticism. It is a smaller one than saying the result was chosen after the fact.
When a preprint is the best available evidence and we say so Replied, post #107 · Evidence › Preprints · 28 Aug 2025 · 3 likes Everything in post #105 holds. The case it does not cover is the one I have. Screening on a preprint server is minimal and is not review. It filters obvious problems…
Cross-border purchase within the EU: the actual rules Replied, post #10 · Access › International · 19 Aug 2025 · 3 likes Building on post #9 rather than restating it. Cross-border prescribing and cross-border dispensing are different questions with different answers in most jurisdictions.…
Follow-up: The lowest dose that does anything: is that a real question? Replied, post #42 · Practice › Dosing & titration · 17 Aug 2025 · 0 likes Dose equivalence between different incretin analogues is a weak concept. The molecules differ in structure, half-life, receptor selectivity, and in what has been…
A field-by-field walk through a certificate of analysis Replied, post #82 · Analytics › COA interpretation · 16 Jul 2025 · 0 likes Post #78 describes the usual case. This is about the unusual one. One caution on field-by-field walk through a certificate: everything above assumes the underlying…
Managing an unplanned gap in supply — what changed since Replied, post #17 · Access › Shortages · 14 Jul 2025 · 0 likes On post #15 — agreed on the reasoning, with one qualification. Where a shortage forces a gap, the pharmacokinetics mean a missed week is a perturbation rather than a…
Follow-up: Requesting a page: what makes a good request Replied, post #51 · Documentation › Wiki requests · 19 Jun 2025 · 0 likes Post #47 describes the usual case. This is about the unusual one. Suggesting content for a page: if you know a maintained page is missing something important, post a…
Why "any advice?" is the least effective ending for a post — the long version Replied, post #13 · Start Here › How to Ask · 15 Jun 2025 · 12 likes Number your questions if there is more than one. It sounds fussy. It means the answer can be numbered back, and you find out which one nobody addressed. It is one…
[2026 update] Clearance pathways and what renal impairment changes Replied, post #46 · Pharmacology › Pharmacokinetics · 15 Jun 2025 · 0 likes Everything in post #45 holds. The case it does not cover is the one I have. Metabolism for peptide drugs is proteolytic rather than hepatic in the usual sense, which is…
Talking to a therapist about this specifically — does this still hold? Replied, post #62 · Wellbeing › Mental health · 16 May 2025 · 0 likes This follows post #60 rather than contradicting it. Social and relationship impacts: weight change affects how others perceive and interact with a person. Those impacts…
How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ Replied, post #101 · Sourcing › Independent verification · 16 May 2025 · 12 likes That is a fair summary of where the discussion has got to.
Pages past their review date, listed — does this still hold? Replied, post #24 · Meta › Wiki maintenance · 10 May 2025 · 9 likes Clear enough that I do not think I have a follow-up, which is unusual.
Comparators chosen for regulatory reasons rather than clinical ones — one year on Replied, post #27 · Evidence › Trials · 10 May 2025 · 7 likes I read post #23 twice before replying, because I had assumed the opposite. What I would tell a new member reading about Comparators chosen for regulatory reasons for…
Reading a trial's population section before its results — does this still hold? Replied, post #68 · Evidence › Trials · 4 May 2025 · 33 likes This follows post #65 rather than contradicting it. Intent-to-treat versus per-protocol: ITT includes everyone assigned regardless of whether they took the drug.…
Needle changes between doses on a reusable pen Replied, post #5 · Devices › Pens & autoinjectors · 24 Apr 2025 · 18 likes A pen delivers a fixed or dialled dose from a cartridge and is a metering device rather than simply a covered syringe. That is why dose changes are constrained to…
Reading a trial's population section before its results — does this still hold? Replied, post #9 · Evidence › Trials · 14 Apr 2025 · 18 likes Safety findings from a trial powered for efficacy are underpowered by construction. Absence of a signal in that setting is weak evidence of absence. Same conclusion as…
Reading order for a first week here, and what to skip until later Replied, post #80 · Start Here › Welcome · 13 Apr 2025 · 0 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…
Antibiotics and a course of something with delayed emptying Replied, post #19 · Practice › Interactions · 12 Apr 2025 · 8 likes Nobody has said the unglamorous part of antibiotics yet, so: most of the variation is explained by things that are boring to write about and easy to check.
Revisiting: Oral versus injected administration claims for BPC-157 Replied, post #7 · Compounds › Repair & healing peptides · 18 Mar 2025 · 5 likes The reason Oral versus injected administration claims is hard to answer is that the obvious measurement and the relevant quantity are not the same thing, and…
Delayed gastric emptying and oral medication absorption: which drugs matter Replied, post #11 · Practice › Interactions · 10 Mar 2025 · 0 likes Summarising the delayed gastric emptying and oral thread so far, since it is long and the answer is buried: the first reply has the method, the fourth has the…
[2026 update] Cardiovascular risk: reading the outcome trials as a set Replied, post #2 · Clinical › Comorbidities · 7 Mar 2025 · 5 likes I had written a reply contradicting the opening post and deleted it. Here is what survived. Cardiovascular risk came up in a thread eighteen months ago and was answered…
Consistent declarations and why they matter more than clever ones Replied, post #116 · Sourcing › Logistics · 3 Mar 2025 · 10 likes Posting my consistent declarations numbers with the method attached so they can be discounted properly. Uncontrolled, unblinded, and collected by someone who wanted a…
Domestic fridge temperature mapping: a cheap experiment — what changed since Replied, post #59 · Devices › Cold chain · 28 Feb 2025 · 29 likes Do not judge cold-chain performance from a single delivery in either direction. It is a distribution and one sample from it is one sample. Old habit: I write down the…
Telehealth prescribing models in the US Replied, post #59 · Regional › North America · 16 Feb 2025 · 8 likes My position on telehealth prescribing models is current rather than settled. I have revised it once already and I expect to again, so treat it accordingly.
A promotion I argued against, and why I lost Replied, post #96 · Documentation › Doc review · 13 Feb 2025 · 17 likes Building on post #93 rather than restating it. Two people in this thread mean different things by promotion and are disagreeing about the definition while believing…
Revisiting: What a well-designed human trial of a secretagogue would look like Replied, post #37 · Compounds › Secretagogues & GH axis · 18 Jan 2025 · 6 likes Storage: these are lyophilised short peptides and are generally reasonably stable dry and considerably less so in solution. Reconstituting only what will be used within…
Follow-up: Individual participant data versus aggregate data Replied, post #59 · Evidence › Meta-analyses · 10 Jan 2025 · 21 likes Fixed-effects versus random-effects models: fixed-effects assumes all studies are estimating the same thing and variation is sampling error. Random-effects assumes…
Coming back to: Preparing for an appointment: one page, three questions Replied, post #142 · Clinical › Prescriber conversations · 8 Jan 2025 · 2 likes Post #141 answers the question as asked. The question underneath it is different. Bringing a record of symptoms with dates and severities makes an assessment materially…
[2026 update] Journal club: SURPASS-2 and the semaglutide 1 mg comparator Replied, post #85 · Evidence › Journal club · 7 Jan 2025 · 5 likes That matches what I have seen, for whatever a single anecdote is worth.
A claim built entirely on a subgroup analysis — what changed since Started this topic · Evidence › Study critique · 7 Jan 2025 · 36 likes On the subject in the title: A claim built entirely on a subgroup analysis — what changed since Working notes rather than a conclusion. What changes if the standard…
SNAC and the mechanism of oral peptide absorption — the long version Replied, post #15 · Compounds › Oral incretins · 8 Dec 2024 · 24 likes On analysis of a small molecule: purity by chromatography against a reference standard, identity by mass and by spectroscopy, and residual solvents by a headspace…
Request: a diff view for wiki revisions Replied, post #24 · Meta › Feature requests · 15 Nov 2024 · 0 likes Building on post #22 rather than restating it. Speaking only to diff view for wiki revisions as I have actually seen it, rather than as it is usually described: the…
Food noise reducing and the disorientation that can follow Replied, post #29 · Wellbeing › Mental health · 27 Oct 2024 · 10 likes Picking up post #27: that is the part I would want checked first. Nothing here is medical advice and several members in this subcategory say plainly that they are…
Priming a pen and whether the primed volume is wasted — one year on Replied, post #4 · Devices › Pens & autoinjectors · 9 Sep 2024 · 13 likes A pen that will not dial to the intended dose is usually telling you the cartridge does not contain enough for it. That is a designed behaviour rather than a fault.…
Guidelines revision: what changed and why Replied, post #39 · Meta › Announcements · 26 Jul 2024 · 0 likes Useful. I had the fact and not the reason, which turns out to be the important half.
Splitting a weekly dose in two: the pharmacokinetic argument against — the long version Replied, post #60 · Practice › Dosing & titration · 8 Jul 2024 · 2 likes Adding the measurement that post #57 says would settle it. Holding at a dose that is working is a legitimate position and it is not what the trial protocols did. The…