v.bergstrom

TL2 · Rennes

Contributes reviews on supplier material. Based in Rennes.

Joined 21 July 2025 · last posted 2d

89 posts, newest first. Showing up to 150.

Programming during a large energy deficit Replied, post #50 · Nutrition & Training › Resistance training · 26 Jul 2026 · 7 likes Where training is new, the early gains are largely neural, which is why they can appear even during a deficit and do not indicate tissue change. That is one dataset and…
Why cagrilintide alone is discussed so much less than in combination — does this still… Replied, post #29 · Compounds › Cagrilintide & amylin analogues · 22 Jul 2026 · 5 likes Narrowing post #26, because the general version has more than one answer. For anyone arriving from searches on "amylin agonist": this subcategory discusses published…
Revisiting: Protein density versus volume when you cannot eat much Replied, post #91 · Nutrition & Training › Protein & intake · 22 Jul 2026 · 0 likes Fibre and fluid tend to fall alongside protein when intake drops, and the constipation reported here follows from that as much as from the mechanism.
Revisiting: Journal club: SURMOUNT-OSA and a hard endpoint in a soft field Replied, post #92 · Evidence › Journal club · 9 Jul 2026 · 32 likes On SURMOUNT-OSA 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 threads…
Revisiting: What pooling buys you and what it destroys Replied, post #83 · Evidence › Meta-analyses · 8 Jul 2026 · 18 likes Taking post #82 at face value and following it one step further. Where the included trials share a sponsor and a protocol template, their errors correlate and pooling…
[2026 update] Journal club: what we got wrong in an earlier session Replied, post #4 · Evidence › Journal club · 1 Jul 2026 · 0 likes Picking up post #2: that is the part I would want checked first. A session that ends with a list of what remains unresolved is more useful than one that ends with a…
Why side effects reset at each escalation and that is not a failure Replied, post #3 · Practice › Side effects · 1 Jul 2026 · 17 likes Gastrointestinal effects in this class are dose-related and escalation-related. Both are true simultaneously, which is why symptoms typically return at each step and…
[2026 update] Interpreting a result that disagrees with the supplier's certificate Replied, post #47 · Sourcing › Independent verification · 27 Jun 2026 · 3 likes Useful. I had the fact and not the reason, which turns out to be the important half.
Named, unnamed and unspecified impurities as regulatory categories — the long version Replied, post #29 · Analytics › Impurities & related substances · 27 Jun 2026 · 0 likes Deletion sequences (incomplete coupling during synthesis): lower in mass by one residue. Chromatographically they usually elute earlier or later depending on the…
Stepping down deliberately, and how to do it without losing progress — what changed since Replied, post #19 · Practice › Dosing & titration · 26 Jun 2026 · 2 likes Stepping down deliberately: the withdrawal trials show that stopping is followed by regain. The step-down literature is thinner. The conservative assumption is that…
Why fasting instructions for oral semaglutide are not optional advice Replied, post #60 · Compounds › Oral incretins · 26 Jun 2026 · 10 likes Worth separating two things that post #56 runs together. The absorption enhancer in the licensed oral product works by transiently raising local gastric pH and…
Second pass at: Programming during a large energy deficit Replied, post #33 · Nutrition & Training › Resistance training · 18 Jun 2026 · 0 likes Recovery capacity falls with energy availability, so a programme that worked at maintenance may be too much during a large deficit. On balance I think that is right,…
Spreadsheets: an appreciation — what changed since Replied, post #72 · Lounge › Off topic · 16 Jun 2026 · 25 likes Agreed, and the corollary is that a place with no visible corrections is not a place with fewer errors. Happy to be the one who is wrong here if it settles the question.
GLP-1 receptor distribution: central and peripheral Replied, post #67 · Pharmacology › Receptor biology · 11 Jun 2026 · 24 likes Biased agonism — where different ligands at the same receptor favour different downstream pathways — is a plausible explanation for differences between compounds in…
What to include when your question involves a chromatogram — one year on Replied, post #29 · Start Here › How to Ask · 7 Jun 2026 · 5 likes Timeline questions need the timeline. Dates, in order, with what happened on each. "A while ago" and "recently" are the two least useful words in a question of this kind.
Official shortage notices and what they authorise Replied, post #84 · Access › Shortages · 3 Jun 2026 · 6 likes Post #82 describes the usual case. This is about the unusual one. The published shortage register maintained by the national regulator is the authoritative source here,…
Follow-up: Comparing two chromatograms from different laboratories, properly Replied, post #36 · Analytics › HPLC & UHPLC · 2 Jun 2026 · 0 likes This is why a purity figure without the underlying chromatogram is weaker evidence than it appears. It is also why two competent laboratories can report different…
Risk-of-bias tools and the judgement they conceal — does this still hold? Replied, post #11 · Evidence › Meta-analyses · 1 Jun 2026 · 16 likes Where I part company with post #9, and it is a narrow parting. Double extraction with disagreement resolution is standard and is worth checking for, because single…
Request: show the solution author in the topic list — what changed since Replied, post #59 · Meta › Feature requests · 3 May 2026 · 2 likes Effort estimation: some features are trivial to implement; others are substantial work. Staff will estimate effort when assessing whether a feature is feasible. If that…
Private prescribing in the UK: what is actually involved Replied, post #3 · Regional › UK & Ireland · 23 Apr 2026 · 0 likes Narrowing post #2, because the general version has more than one answer. The version of private prescribing that circulates here is a simplification of a…
Journal club: indirect comparison between two programmes, defended and attacked Replied, post #36 · Evidence › Journal club · 21 Apr 2026 · 0 likes SURPASS-2 (N Engl J Med 2021): Direct comparison of tirzepatide with semaglutide 1.0 mg. The 1.0 mg dose is not the highest available, which is the central and…
[2026 update] A vial that will not fully dissolve: what to check and in what order Replied, post #9 · Practice › Reconstitution · 13 Apr 2026 · 7 likes Arithmetic step by step: a 5 mg vial with 2 mL of diluent gives (5 mg) / (2 mL) = 2.5 mg/mL. On a U-100 syringe at that concentration, 100 units = 1 mL = 2.5 mg, so…
Coming back to: Training through a dose escalation week Replied, post #74 · Nutrition & Training › Resistance training · 8 Apr 2026 · 20 likes Post #73 is the version of this I will quote in future. One addition. Reframing Training through a dose escalation slightly, because I think the disagreement is about…
[2026 update] 0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Replied, post #7 · Devices › Syringes & needles · 3 Apr 2026 · 0 likes Where the 0.3 ml versus 0.5 ml 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 injected administration claims for BPC-157 Replied, post #23 · Compounds › Repair & healing peptides · 16 Mar 2026 · 29 likes The absence of adequately powered published randomised human trials is the central fact about BPC-157. This site states that plainly rather than hedging. Mechanistic…
Nausea profile of amylin analogues compared with GLP-1 agonists Replied, post #47 · Compounds › Cagrilintide & amylin analogues · 7 Mar 2026 · 0 likes Where I would push back on the nausea profile of amylin analogues consensus is the confidence, not the direction. The direction looks right. The confidence is borrowed.
[2026 update] Composite endpoints and the component doing the work Replied, post #20 · Evidence › Trials · 5 Mar 2026 · 31 likes A request rather than an answer: could whoever has the primary source for Composite endpoints post it? I have seen the claim three times this month and each version had…
MS/MS sequence confirmation: what it costs and when it is worth it — what changed since Replied, post #5 · Analytics › Mass spectrometry · 26 Feb 2026 · 5 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.
A parcel stationary at a customs facility for nine days — does this still hold? Replied, post #6 · Sourcing › Logistics · 21 Feb 2026 · 16 likes Post #3 is right about the mechanism and I think understates the practical bit. Border outcomes are not predictable at the level of an individual parcel. What is…
Second pass at: Circumference measurements as a poor man's composition estimate Replied, post #53 · Outcomes › Body composition · 12 Feb 2026 · 25 likes Comparing a body composition result against a population reference is a different exercise from tracking your own change, and the second is what most people want. The…
Guidelines revision: what changed and why — one year on Replied, post #69 · Meta › Announcements · 11 Feb 2026 · 25 likes The edit is clearer. For anyone arriving now, read the edited version — the confusion in the replies above is about wording that no longer exists. The strength of my…
[2026 update] Confounding by indication, explained with a concrete example Replied, post #33 · Evidence › Study critique · 7 Feb 2026 · 6 likes Surrogate endpoints are not automatically bad and their validity is compound-specific and population-specific. The question is whether this surrogate has been validated…
Revisiting: Absolute versus relative contraindications Replied, post #14 · Safety › Contraindications · 4 Feb 2026 · 11 likes Gastroparesis or severe delayed gastric emptying: these compounds slow gastric emptying. Pre-existing severe gastroparesis can be worsened. That is a relative…
Trifluoroacetate content and its consequences Replied, post #43 · Analytics › Impurities & related substances · 29 Jan 2026 · 1 like The number people quote for trifluoroacetate content is a central estimate presented without its interval, and the interval is wide enough that the estimate is nearly…
Follow-up: Search filters: what is missing Replied, post #14 · Meta › Site feedback · 13 Jan 2026 · 13 likes Building on post #11 rather than restating it. That would also be the fastest way for a new member to understand what R6 actually catches, which is narrower than people…
A partial dose because the pen emptied mid-injection Replied, post #98 · Practice › Administration · 10 Jan 2026 · 8 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. The…
Sleep quality changes during weight loss — what changed since Replied, post #69 · Wellbeing › Sleep · 19 Nov 2025 · 27 likes Where sleep worsened at the same time as an escalation and improved afterwards, that sequence is worth recording rather than reasoning about.
Pen mechanics when the cartridge is nearly empty — does this still hold? Replied, post #17 · Devices › Pens & autoinjectors · 15 Nov 2025 · 10 likes Thank you — that answers what I came here to find out.
Titles that describe the question, not the situation Replied, post #148 · Start Here › How to Ask · 13 Nov 2025 · 28 likes Post #145 describes the usual case. This is about the unusual one. Questions you cannot explain: "I cannot say why I am asking this, but is this compound stable at room…
Reference intervals: how they are constructed and why one in twenty flags Replied, post #8 · Clinical › Bloodwork · 4 Nov 2025 · 0 likes Taking post #7 at face value and following it one step further. Time of day: some biomarkers vary across the day. Cortisol in the morning differs from cortisol in the…
SURMOUNT-4 and what withdrawal data does and does not tell an individual — one year on Replied, post #54 · Compounds › Tirzepatide · 21 Oct 2025 · 8 likes Building on post #53 rather than restating it. The five maintenance doses in the tirzepatide programme give a genuine dose-response curve, which is unusual. Most trials…
Pen mechanics when the cartridge is nearly empty — does this still hold? Replied, post #8 · Devices › Pens & autoinjectors · 21 Oct 2025 · 10 likes Second this, and I would have said it less carefully.
[2026 update] Does dual agonism explain the effect size, or is it dose? Replied, post #51 · Compounds › Tirzepatide · 21 Oct 2025 · 0 likes Research-use-only tirzepatide is not approved for human use and is not made to pharmaceutical standards. Anyone discussing it here is describing what they did, not…
Sleep tracking data and its considerable limitations Replied, post #38 · Wellbeing › Sleep · 20 Oct 2025 · 24 likes Post #36 describes the usual case. This is about the unusual one. A referral for a proper sleep study answers in one night what months of forum discussion cannot.…
Second pass at: What "verified" means on our vendor pages, stated narrowly Replied, post #21 · Sourcing › Vendor reports · 3 Oct 2025 · 2 likes Everything in post #19 holds. The case it does not cover is the one I have. Multiple services on one lot: agreement across two independent laboratories is stronger than…
Citing a preprint in a maintained document: our rule and its reasoning — does this still… Replied, post #62 · Evidence › Preprints · 30 Sep 2025 · 1 like 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…
Reading an interaction checker output critically Replied, post #12 · Practice › Interactions · 27 Sep 2025 · 3 likes Right, and stated more narrowly than I would have dared to state it.
Payment method and the leverage it gives you, ranked Replied, post #7 · Sourcing › Payments · 13 Sep 2025 · 9 likes Summarising the payment method 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…
Journal club: indirect comparison between two programmes, defended and attacked — one… Replied, post #35 · Evidence › Journal club · 8 Sep 2025 · 18 likes Post #31 and I disagree about the size of the effect, not about the direction. Indirect comparison is a good example of a question where the honest answer is boring and…
A checklist for reading a certificate in under two minutes — does this still hold? Replied, post #35 · Analytics › COA interpretation · 20 Aug 2025 · 21 likes Useful. I have added it to my own notes with the date on it.
[2026 update] What we do not know about retatrutide, listed explicitly Replied, post #54 · Compounds › Retatrutide · 19 Aug 2025 · 0 likes What we do not know about retatrutide, listed explicitly: long-term safety, real-world response rates, the dose response in diverse populations, whether the heart-rate…
A ten-fold dose error caught before injection — one year on Replied, post #122 · Devices › Syringes & needles · 4 Aug 2025 · 2 likes Appreciated. The plain phrasing does more work here than a longer post would.
What the GIP component of tirzepatide is thought to contribute, and how confident we can… Replied, post #14 · Compounds › Tirzepatide · 13 Jul 2025 · 5 likes I disagree with the framing of GIP component of tirzepatide above, and I think it is a substantive disagreement rather than a terminological one. Setting out why, so it…
A report I filed that turned out to be wrong, and the correction Replied, post #133 · Sourcing › Vendor reports · 2 Jul 2025 · 0 likes I had written a reply contradicting post #131 and deleted it. Here is what survived. Reports of ordinary results are more valuable than reports of remarkable ones,…
Obstructive sleep apnoea and a hard endpoint in this class Replied, post #126 · Clinical › Comorbidities · 27 Jun 2025 · 2 likes The arithmetic in post #125 is right; the assumption feeding it is the part to check. Obstructive sleep apnoea: SURMOUNT-OSA used an objective endpoint, the…
A 5 mg vial and a 0.25 mg dose: the arithmetic in full — the long version Replied, post #142 · Practice › Reconstitution · 22 Jun 2025 · 7 likes Preservative effectiveness is tested against a defined microbial challenge under defined conditions. It is not a licence to treat an entered vial as sterile…
Revisiting: Why a compound being unapproved is not the same as being illegal to possess Replied, post #28 · Sourcing › Regulatory · 18 Jun 2025 · 17 likes Everything in post #26 holds. The case it does not cover is the one I have. If someone has run compound being unapproved properly I would rather read that than my own…
Coming back to: When "no data" is the complete and final answer Replied, post #8 · Compounds › Other compounds · 8 Jun 2025 · 18 likes Agreed on all of that, and I have nothing to add to it.
EU-wide position versus national implementation Replied, post #9 · Regional › European Union · 6 Jun 2025 · 9 likes Worth separating two things that post #5 runs together. Eu-wide position versus national implementation is worth one more sentence than it usually gets, and the…
Half-life, steady state, and accumulation worked through Replied, post #18 · Pharmacology › Pharmacokinetics · 24 May 2025 · 0 likes No notes. Posting so the count is not one.
Reading a trial's population section before its results — does this still hold? Replied, post #75 · Evidence › Trials · 6 May 2025 · 18 likes Trial duration determines what can be observed. A weight-change trajectory at 40 weeks and at 72 weeks are different observations and both get quoted as the result.…
Second pass at: Pharmacy supply in the UK and the questions you will be asked Replied, post #34 · Regional › UK & Ireland · 2 May 2025 · 0 likes I read post #30 twice before replying, because I had assumed the opposite. What I would check first on Pharmacy supply is whether the thing being measured moved or…
Journal club: SURMOUNT-4 and continuation versus withdrawal — a second dataset Replied, post #19 · Evidence › Journal club · 20 Apr 2025 · 4 likes Where I have landed on SURMOUNT-4 and continuation versus withdrawal, having got it wrong once in public: the direction is clear, the magnitude is not, and anyone…
Review cadence: how often is a page actually re-checked? Replied, post #19 · Documentation › Doc review · 14 Apr 2025 · 0 likes Coming back to post #17, because the follow-up matters more than the original answer. Multilingual versions: if a maintained page should exist in another language,…
Telehealth prescribing models in the US Replied, post #81 · Regional › North America · 7 Apr 2025 · 15 likes The reason telehealth prescribing models is hard to answer is that the obvious measurement and the relevant quantity are not the same thing, and substituting one for…
UK access routes, dated and sourced — a second dataset Replied, post #55 · Regional › UK & Ireland · 25 Mar 2025 · 9 likes Post #53 and I disagree about the size of the effect, not about the direction. The most useful contribution is a link to the current official page with the date you…
Documenting a supplier's response to a discrepancy — does this still hold? Replied, post #15 · Sourcing › Vendor reports · 22 Mar 2025 · 21 likes Picking up post #14: that is the part I would want checked first. The cost of a submission is worth stating. It is the main reason people do not do this and knowing the…
Criticising the method without criticising the authors Replied, post #46 · Evidence › Study critique · 11 Mar 2025 · 0 likes Two people in this thread mean different things by criticising the method without criticising and are disagreeing about the definition while believing they are…
Consistent declarations and why they matter more than clever ones Replied, post #107 · Sourcing › Logistics · 1 Mar 2025 · 16 likes Narrowing post #106, because the general version has more than one answer. Peak periods and public holidays affect this more than any other factor and are entirely…
A supplier that answers analytical questions with restated claims Replied, post #26 · Sourcing › Red flags · 18 Feb 2025 · 3 likes Safety documentation absent: a supplier that cannot provide information about sterility testing, endotoxin testing, or safety documentation when asked is raising flags.…
[2026 update] Journal club: SURPASS-2 and the semaglutide 1 mg comparator Replied, post #129 · Evidence › Journal club · 16 Feb 2025 · 0 likes The arithmetic in post #126 is right; the assumption feeding it is the part to check. Reading order that works for these sessions: registry entry, methods, baseline…
Canadian access and provincial variation Replied, post #12 · Regional › North America · 22 Jan 2025 · 13 likes This follows post #9 rather than contradicting it. Reading this canadian access and provincial variation thread as someone who came in with a fixed view: the third and…
[2026 update] Step therapy requirements and how to satisfy them Replied, post #114 · Access › Insurance & coverage · 10 Jan 2025 · 31 likes Formulary status: the list of covered medications and the tier (how much you pay) they are on. Checking the current formulary before going to a clinic appointment saves…
Fibre intake when total intake falls, and the constipation link Replied, post #10 · Nutrition & Training › Protein & intake · 25 Dec 2024 · 20 likes Self-reported intake is optimistic by a consistent margin in the published comparisons, which is worth applying to your own numbers.
Coming back to: When to suspect the method rather than the sample Replied, post #105 · Analytics › Method validation · 20 Dec 2024 · 31 likes Specificity is the first question: does the method separate the analyte from everything reasonably expected to be present? A method that has not been challenged with…
Body image changing more slowly than the body Replied, post #69 · Wellbeing › Mental health · 19 Dec 2024 · 2 likes Support and community: some people process weight change through community (online or in-person). Others prefer privacy. Knowing what you need and seeking it…
What the published dose-response for semaglutide actually looks like above 2.4 mg — a… Started this topic · Compounds › Semaglutide · 14 Dec 2024 · 8 likes Asking directly, because I could not find a straight answer: What the published dose-response for semaglutide actually looks like above 2.4 mg — a second dataset Two…
Injection-site reactions: describing them precisely enough to be useful Replied, post #31 · Practice › Side effects · 28 Nov 2024 · 12 likes The honest answer on injection-site reactions is that it depends, and the useful part is the list of what it depends on. Four items, in rough order of how much they…
Tracking semaglutide's approved indications across jurisdictions, dated — does this… Replied, post #29 · Compounds › Semaglutide · 17 Nov 2024 · 0 likes The SELECT trial changed the positioning because it was the first cardiovascular outcome trial in people without diabetes. That decoupled the cardiovascular argument…
EMA product information as a primary source — does this still hold? Replied, post #69 · Regional › European Union · 16 Nov 2024 · 23 likes Following, with nothing to contribute beyond having asked the same thing elsewhere.
Hypertension improvement and when medication needs revisiting — a second dataset Replied, post #67 · Clinical › Comorbidities · 20 Oct 2024 · 2 likes Eating-disorder history is raised here regularly and is the case where the guidance most consistently says the decision needs specialist input. Small point, but it is…
Revisiting: Holding a dose indefinitely: is there a documented downside? Replied, post #2 · Practice › Dosing & titration · 19 Oct 2024 · 8 likes If symptoms reset at each step, that is the expected pattern rather than a sign that the previous adaptation was imaginary. Every dose increase is a new exposure.
Progressive overload when the scale is falling — one year on Replied, post #138 · Nutrition & Training › Resistance training · 8 Oct 2024 · 0 likes Practical note on Progressive overload: write down what you expect before you look. The number of times I have found what I went looking for is higher than chance would…
Food noise reducing and the disorientation that can follow Replied, post #12 · Wellbeing › Mental health · 25 Sep 2024 · 31 likes My understanding of food noise is a few years old and may have been superseded. If it has been, I would genuinely like to know rather than keep repeating it.
Coming back to: Preparing for an appointment: one page, three questions Replied, post #60 · Clinical › Prescriber conversations · 19 Sep 2024 · 2 likes Bringing a record of symptoms with dates and severities makes an assessment materially easier and is the single most useful preparation.
Reporting a discrepancy without making an allegation Replied, post #41 · Sourcing › Vendor reports · 24 Aug 2024 · 2 likes Picking up post #38: that is the part I would want checked first. I read the earlier replies on reporting a discrepancy twice before writing this, because I had assumed…
Taste changes and food aversion, reported and discussed Replied, post #7 · marked as the solution · Practice › Side effects · 3 Aug 2024 · 11 likes Post #4 answers the question as asked. The question underneath it is different. I would be cautious about generalising from the taste changes and food aversion example…
Circumference measurements as a poor man's composition estimate Replied, post #5 · Outcomes › Body composition · 17 Jul 2024 · 1 like If someone has run circumference measurements properly I would rather read that than my own reconstruction of it. Posting mine only because the thread has gone quiet.
Journal club: FLOW and the renal composite, component by component Replied, post #30 · Evidence › Journal club · 11 Jul 2024 · 19 likes Reading order that works for these sessions: registry entry, methods, baseline table, primary result, then abstract last. Reading the abstract first anchors everything…