r.restrepo

TL2 · Tours

Contributes reviews on supplier material. Based in Tours.

Joined 5 March 2025 · last posted 22h

79 posts, newest first. Showing up to 150.

Journal club: indirect comparison between two programmes, defended and attacked Replied, post #131 · Evidence › Journal club · 27 Jul 2026 · 12 likes Coming back to post #128, because the follow-up matters more than the original answer. An hour is enough for one paper read properly and not enough for two read partly.…
Here for the analytics and not much else Replied, post #101 · Lounge › Introductions · 27 Jul 2026 · 7 likes No judgment: people come to this community from all backgrounds and with all motivations. Introductions are for getting to know each other, not for evaluation.
[2026 update] Interpreting a result that disagrees with the supplier's certificate Replied, post #126 · Sourcing › Independent verification · 26 Jul 2026 · 0 likes Taking post #125 at face value and following it one step further. The record shows what was measured. Everything beyond that is inference and this site tries to keep…
What consumer-accessible tests can and cannot determine — a second dataset Replied, post #121 · Analytics › Home & field testing · 24 Jul 2026 · 10 likes Appreciated. The plain phrasing does more work here than a longer post would.
Pooling trials with different estimands Replied, post #119 · Evidence › Meta-analyses · 22 Jul 2026 · 0 likes Building on post #118 rather than restating it. Subgroup analysis: sometimes a meta-analysis reports separate pooled estimates for different subgroups (e.g., by…
Receptor desensitisation as a tolerance hypothesis, and its weak evidence Replied, post #50 · Pharmacology › Receptor biology · 20 Jul 2026 · 10 likes Glucagon receptor agonism: glucagon receptor agonism increases energy expenditure and promotes hepatic fat oxidation. The mechanism is distinct from GLP-1 and GIP…
Completing a dose with a second syringe, and the dead-volume arithmetic Replied, post #70 · Practice › Administration · 14 Jul 2026 · 1 like Post #68 and I disagree about the size of the effect, not about the direction. The practical version of completing a dose is three sentences long. The rigorous version…
[2026 update] Antibiotics and a course of something with delayed emptying Replied, post #30 · Practice › Interactions · 10 Jul 2026 · 26 likes I read post #26 twice before replying, because I had assumed the opposite. A supplement is a drug for interaction purposes, and the fact that it is sold without a…
Journal club: SUSTAIN 6 and its retinopathy signal Replied, post #43 · Evidence › Journal club · 9 Jul 2026 · 29 likes Narrowing post #42, because the general version has more than one answer. Two people in this thread mean different things by SUSTAIN 6 and are disagreeing about the…
Coming back to: Specificity, linearity, accuracy, precision, range, robustness — with… Replied, post #63 · Analytics › Method validation · 22 Jun 2026 · 0 likes Post #61 answers the question as asked. The question underneath it is different. Reporting a result to more decimal places than the method's precision supports is a…
Does dual agonism explain the effect size, or is it dose? Replied, post #50 · Compounds › Tirzepatide · 21 Jun 2026 · 0 likes Building on post #47 rather than restating it. The published pharmacokinetics show dose proportionality across the studied range, which means dose arithmetic behaves…
How shortages have affected compounding permissions — does this still hold? Replied, post #13 · Access › Shortages · 14 Jun 2026 · 9 likes Coming back to post #9, because the follow-up matters more than the original answer. Shortages end and the notices are updated. Checking the current notice takes a…
Follow-up: Search filters: what is missing Replied, post #126 · Meta › Site feedback · 11 Jun 2026 · 22 likes Confirming post #125 from a second method, which matters more than confirming it from a second person. Accessibility: screen readers, keyboard navigation, contrast,…
Insomnia at a dose step: reported experiences — the long version Replied, post #31 · Wellbeing › Sleep · 7 Jun 2026 · 4 likes Post #28 answers the question as asked. The question underneath it is different. Summarising the Insomnia thread so far, since it is long and the answer is buried: the…
Manufacturer assistance programmes and their eligibility rules Replied, post #28 · Access › Pricing · 24 May 2026 · 1 like Everything in post #26 holds. The case it does not cover is the one I have. Manufacturer assistance programmes is one of those subjects where the general answer and the…
Run-in periods and the population they select Replied, post #123 · Evidence › Trials · 24 May 2026 · 0 likes Entry criteria, run-in periods and the self-selection of people willing to enter a multi-year trial all narrow the population. That is how internal validity is bought…
Reconstituting a multi-strength kit without mixing yourself up — what changed since Replied, post #17 · Practice › Reconstitution · 21 May 2026 · 0 likes Worth separating two things that post #15 runs together. Reconstituting a multi-strength kit: if a kit contains 5 mg, 10 mg, 15 mg vials and you are reconstituting all…
Journal club: indirect comparison between two programmes, defended and attacked Replied, post #51 · Evidence › Journal club · 8 May 2026 · 11 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.
System suitability injections: if they failed, the run did not happen — the long version Replied, post #3 · Analytics › HPLC & UHPLC · 6 May 2026 · 8 likes Typical suitability criteria are a replicate area relative standard deviation below about two per cent, a tailing factor inside a defined window, a resolution minimum…
Blind submission and why it changes minds — the long version Replied, post #33 · Sourcing › Independent verification · 21 Apr 2026 · 11 likes I have no financial interest in anything named in this thread and I want to say so before I comment on Blind submission, because it is the sort of subject where it…
Revisiting: The report format the maintainers ask for, and why each field is there Replied, post #46 · Sourcing › Vendor reports · 5 Apr 2026 · 0 likes Dosing and purity: a vial that is 99% pure might contain 80% of its label claim if the other mass is water, counter-ion, and excipient. Purity and content are…
Pregnancy and pregnancy planning: contraindication and washout Replied, post #86 · Clinical › Special populations · 26 Mar 2026 · 0 likes Post #83 and I disagree about the size of the effect, not about the direction. Extrapolating a point estimate to somebody well outside the enrolled range should be…
Coming back to: Time to steady state after a dose increase Replied, post #18 · Pharmacology › Pharmacokinetics · 22 Mar 2026 · 0 likes Saving this. It is the version I will quote when the question comes round again.
[2026 update] Distinguishing expected GI effects from something that needs urgent… Replied, post #12 · Practice › Side effects · 20 Mar 2026 · 1 like Effects that improve with time and effects that improve with dose reduction are different findings. Working out which you have requires holding the dose steady long…
Reading a preclinical wound-healing model and its relevance to a human tendon — a second… Replied, post #38 · Compounds › Repair & healing peptides · 11 Mar 2026 · 2 likes Answering the question post #36 raises rather than the one it answers. BPC-157's published evidence is overwhelmingly preclinical and mostly rodent. That is not a…
Second pass at: What pooling buys you and what it destroys Replied, post #25 · Evidence › Meta-analyses · 8 Mar 2026 · 0 likes Double extraction with disagreement resolution is standard and is worth checking for, because single extraction errors are common and non-random.
Coming back to: Training through a dose escalation week Replied, post #42 · Nutrition & Training › Resistance training · 3 Mar 2026 · 4 likes Answering the question post #40 raises rather than the one it answers. Post-weight-loss training: once weight loss is complete and energy deficit ends, training can…
The lowest dose that does anything: is that a real question? Replied, post #17 · Practice › Dosing & titration · 2 Mar 2026 · 2 likes Grateful for the specificity. Vague answers to this question are what sent me looking.
Second pass at: Identical chromatograms across two different lots Replied, post #16 · Sourcing › Red flags · 19 Feb 2026 · 4 likes The practical version of Identical chromatograms is three sentences long. The rigorous version is three pages and reaches the same conclusion with the conditions…
Interpreting a result that disagrees with the supplier's certificate Replied, post #121 · Sourcing › Independent verification · 13 Feb 2026 · 15 likes Asking the supplier before publishing a discrepancy is the convention here. Most discrepancies are explained by handling or method and asking costs a day.
The 2.5 mg starting dose is not a therapeutic dose — why that matters Replied, post #8 · marked as the solution · Compounds › Tirzepatide · 5 Feb 2026 · 7 likes Building on post #5 rather than restating it. 2.5 mg starting dose is well covered in the tag pages, and the older discussions are better than the recent ones because…
Second pass at: Pregnancy and pregnancy planning: contraindication and washout Replied, post #56 · Clinical › Special populations · 24 Jan 2026 · 33 likes Post #53 and I disagree about the size of the effect, not about the direction. On Pregnancy and pregnancy planning I would separate what is worth knowing from what is…
Adsorption to container surfaces and to plastics Replied, post #6 · Pharmacology › Formulation chemistry · 13 Jan 2026 · 0 likes What I would want before treating adsorption as settled: the method, the sample, and whether anyone tried to find the opposite result. Two of the three are usually…
The nausea timeline across the first four weeks, with a tabulated log — what changed since Replied, post #25 · Practice › Side effects · 5 Jan 2026 · 0 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…
Follow-up: Reconciling a label claim with a content assay Started this topic · Analytics › COA interpretation · 27 Dec 2025 · 0 likes Reconciling a label claim with a content assay Writing it up because I had to work it out twice and would rather nobody else did. A follow-up question about Reconciling…
Measurement error in home scales, with a worked standard deviation — the long version Replied, post #2 · Research Methods › Statistics · 23 Dec 2025 · 18 likes The opening post and I disagree about the size of the effect, not about the direction. A note on how Measurement error in home scales gets discussed rather than on…
Revisiting: Why tirzepatide titration schedules have more steps than semaglutide's Replied, post #10 · Compounds › Tirzepatide · 6 Nov 2025 · 20 likes Nausea profile: some people report tirzepatide as less nausea-prone than semaglutide, others report it as more. The trial reported gastrointestinal effects broadly…
Batch date after test date, and other internal inconsistencies Replied, post #9 · Analytics › COA interpretation · 16 Oct 2025 · 3 likes Post #7 and I disagree about the size of the effect, not about the direction. A chromatogram supplied as a small image is legible for peak shape and not for baseline…
Temperature loggers worth the money Replied, post #41 · Devices › Cold chain · 13 Oct 2025 · 0 likes If you are not going to be there, arranging a secure delivery point is worth more than any packing decision the supplier can make.
Compounds this community declines to help with, and why Replied, post #51 · Compounds › Other compounds · 3 Oct 2025 · 3 likes Dose conversions between related compounds in this subcategory are made far too casually. Structural similarity does not imply potency similarity and frequently does…
A preprint whose numbers changed substantially at publication Replied, post #75 · Evidence › Preprints · 2 Oct 2025 · 10 likes That is a cleaner way of putting what I was circling around.
Pooling trials with different estimands — what changed since Replied, post #31 · Evidence › Meta-analyses · 30 Sep 2025 · 16 likes Where the Pooling trials with different estimands discussion usually stalls is that nobody wants to say "I do not know" and everyone is willing to say "it varies".…
Column chemistry choices for a 40-residue peptide Replied, post #37 · Analytics › HPLC & UHPLC · 15 Sep 2025 · 2 likes Post #34 is the version of this I will quote in future. One addition. Carryover from a previous injection shows up as a small peak at the same retention time in a…
Request: a diff view for wiki revisions — the long version Replied, post #38 · Meta › Feature requests · 3 Sep 2025 · 3 likes Request with the use case rather than the feature. I frequently want every topic that cites a particular maintained document. At the moment I can find the document from…
Canadian access and provincial variation — one year on Replied, post #16 · Regional › North America · 22 Jul 2025 · 22 likes Everything in post #12 holds. The case it does not cover is the one I have. Canadian access and provincial variation has been discussed here with more heat than it…
Second pass at: Triple agonism: additive, synergistic, or neither? Replied, post #81 · Compounds › Retatrutide · 18 Jul 2025 · 0 likes Retatrutide is investigational. Anything obtained outside a trial is by definition research-use-only material with no human-use authorisation. This site will state that…
Why "any advice?" is the least effective ending for a post — the long version Replied, post #25 · Start Here › How to Ask · 15 Jul 2025 · 0 likes Chromatogram questions: describe the method first. Column type, gradient, wavelength, detection method. Everything else follows from method. A chromatogram without…
Pooling trials with different estimands — what changed since Replied, post #2 · Evidence › Meta-analyses · 7 Jul 2025 · 0 likes Before the thread moves on from Pooling trials with different estimands — what is the sample size behind the claim? I am not being difficult; I have seen the same…
Interim analyses and stopping rules — does this still hold? Replied, post #31 · Evidence › Trials · 4 Jul 2025 · 18 likes A treatment-policy estimand asks what happens to people assigned to a strategy, including those who abandon it. A hypothetical estimand asks what would have happened…
Coming back to: Sample size calculations, read backwards from the published number Replied, post #47 · Evidence › Trials · 27 Jun 2025 · 3 likes Adding the measurement that post #45 says would settle it. I think the Sample size calculations question is answerable and has not been answered, which is a more…
Insulin combinations and hypoglycaemia risk Replied, post #18 · Practice › Interactions · 23 Jun 2025 · 30 likes The arithmetic in post #16 is right; the assumption feeding it is the part to check. SGLT2 inhibitors: frequently co-administered and relevant to renal and…
Hepatic steatosis: what the MASH trial evidence supports Replied, post #61 · Clinical › Comorbidities · 10 Jun 2025 · 4 likes Post #59 and I disagree about the size of the effect, not about the direction. Hepatic steatosis and MASH: a phase 2 trial in semaglutide for steatohepatitis showed…
Follow-up: Tracking intake honestly when appetite is absent Replied, post #38 · Nutrition & Training › Protein & intake · 7 Jun 2025 · 5 likes I changed my mind about Tracking intake after someone here asked me for the source and I could not produce one. That is worth saying out loud because it is the ordinary…
Follow-up: What other technical communities get right that we do not Replied, post #123 · Lounge › Off topic · 7 Jun 2025 · 0 likes Industry and supply chain: post about manufacturing, pharmaceutical economics, or market dynamics if you have something substantive to contribute. The general case is…
DXA precision and the least significant change for lean mass — the long version Replied, post #101 · Outcomes › Body composition · 26 May 2025 · 15 likes Coming back to post #99, because the follow-up matters more than the original answer. Maintenance phase: tracking body composition during maintenance (weight stable) is…
Talking to a therapist about this specifically — does this still hold? Replied, post #60 · Wellbeing › Mental health · 12 May 2025 · 6 likes Motivation and expectation: starting with clear motivation and realistic expectations about what will happen and when helps with psychological adjustment. I would treat…
Individual participant data versus aggregate data Replied, post #26 · Evidence › Meta-analyses · 10 Apr 2025 · 3 likes I had written a reply contradicting post #24 and deleted it. Here is what survived. Pooled estimates and heterogeneity: when trials differ in population, duration, or…
Retatrutide dose escalation in the published trials Replied, post #104 · Compounds › Retatrutide · 8 Apr 2025 · 19 likes Post #102 is the version of this I will quote in future. One addition. Retatrutide dose escalation looks different depending on whether you are reading the primary…
Obstructive sleep apnoea and a hard endpoint in this class Replied, post #46 · Clinical › Comorbidities · 31 Mar 2025 · 2 likes No disagreement from me. Posting only so the question does not look ignored.
Requesting a page: what makes a good request Replied, post #8 · Documentation › Wiki requests · 25 Feb 2025 · 0 likes Picking up post #5: that is the part I would want checked first. A document with no maintainer becomes wrong quietly, which is worse than not existing, because it…
Albumin binding and how it produces a long half-life Replied, post #9 · Pharmacology › Pharmacokinetics · 25 Feb 2025 · 1 like Coming back to post #7, because the follow-up matters more than the original answer. Albumin binding: semaglutide binds albumin through a fatty side chain, which…
Coming back to: Official shortage notices and what they authorise Replied, post #14 · Access › Shortages · 12 Feb 2025 · 18 likes Switching presentation or strength during a shortage is a prescribing decision rather than a substitution anybody should improvise. Second-hand, so weight it accordingly.
Why mass spectrometry cannot tell you about an epimer Replied, post #50 · Analytics › Mass spectrometry · 7 Feb 2025 · 18 likes Bookmarking this. I will come back when I have something worth adding.
Anxiety in the first weeks: drug, situation, or both Replied, post #43 · Wellbeing › Mental health · 27 Jan 2025 · 16 likes That is clearer than the version I had in my head. Thank you.
Semaglutide half-life: where the 165 to 184 hour figure comes from — what changed since Replied, post #79 · Compounds › Semaglutide · 7 Jan 2025 · 6 likes Discontinuation rates in the trials are worth reading alongside efficacy and almost never are. A large mean effect in a population where a meaningful fraction stopped…
When "no data" is the complete and final answer Replied, post #32 · Compounds › Other compounds · 1 Dec 2024 · 16 likes Thymosin alpha-1 has a regulatory history in several jurisdictions and a real clinical literature, which puts it in a different evidential category from most of its…
Fixed versus detachable needles: the trade-offs Replied, post #21 · Devices › Syringes & needles · 27 Nov 2024 · 21 likes What I would tell a new member reading about fixed versus detachable needles for the first time: the confident posts are not the reliable ones, and the reliable ones…
Follow-up: Recovery when intake is low: what to cut first Replied, post #2 · Nutrition & Training › Resistance training · 31 Oct 2024 · 9 likes Where I part company with the opening post, and it is a narrow parting. Where I have landed on Recovery, having got it wrong once in public: the direction is clear, the…
Requesting a page: what makes a good request — what changed since Replied, post #52 · Documentation › Wiki requests · 11 Oct 2024 · 20 likes Accessibility feedback: if you have trouble accessing or reading a maintained page (screen reader issues, contrast problems, small text) report it. Accessibility…
Progressive overload when the scale is falling — one year on Replied, post #110 · Nutrition & Training › Resistance training · 1 Oct 2024 · 32 likes Before the thread moves on from Progressive overload — what is the sample size behind the claim? I am not being difficult; I have seen the same figure quoted from an n…
Revisiting: Melanocortin agonists: mechanism and the documented adverse profile Replied, post #14 · Compounds › Other compounds · 23 Sep 2024 · 20 likes Fine by me. I had wanted a stronger conclusion and there is not one available.
Journal club: SURPASS-2 and the semaglutide 1 mg comparator Replied, post #51 · Evidence › Journal club · 22 Sep 2024 · 0 likes Reading back through, this was answered upthread and I missed it. My fault.
Revisiting: How to bring a laboratory report to an appointment usefully Replied, post #38 · Clinical › Bloodwork · 18 Sep 2024 · 6 likes Coming back to post #36, because the follow-up matters more than the original answer. Bring a laboratory was covered in the wiki last year and the page has a review…
Orforglipron as a non-peptide: what changes when the molecule is small Replied, post #20 · Compounds › Oral incretins · 29 Aug 2024 · 16 likes Timing consistency matters more for oral dosing than for weekly injection, because absorption depends on the state of the stomach and the state of the stomach varies…
Correlation in a self-tracked dataset: what it can support Replied, post #76 · Research Methods › Statistics · 23 Aug 2024 · 0 likes The thing about correlation that took me longest to accept is that a plausible mechanism is not evidence of an effect. It is a reason to look, not a result.
Coming back to: Purity assay versus content assay: two different numbers Replied, post #37 · Analytics › COA interpretation · 10 Aug 2024 · 14 likes Picking up post #34: that is the part I would want checked first. Where two documents for the same lot disagree, the useful question is which was measured and which was…
PIONEER 6 cardiovascular safety, read as a safety trial rather than an efficacy one —… Replied, post #4 · Compounds › Oral incretins · 14 Jul 2024 · 0 likes Trial adherence in an oral trial with strict administration requirements is genuinely worse than trial-published data often suggests. That is why the exposure…
Assessing a warm arrival: the decision process — one year on Replied, post #91 · Sourcing › Logistics · 1 Jun 2024 · 0 likes Assessing a warm arrival: I would want to see the raw numbers rather than the summary before agreeing. Summaries lose exactly the information that would settle this.
Assessing a warm arrival: the decision process — one year on Replied, post #72 · Sourcing › Logistics · 31 May 2024 · 11 likes Post #70 put the caveat in the right place and I want to underline it. The most useful logistics record is boring: order date, dispatch date, arrival date, condition on…