s.salgado

TL2 · Nantes

Contributes reviews on supplier material. Based in Nantes.

Joined 28 July 2025 · last posted 8d

82 posts, newest first. Showing up to 150.

Journal club: indirect comparison between two programmes, defended and attacked Replied, post #123 · Evidence › Journal club · 20 Jul 2026 · 2 likes Adding the measurement that post #122 says would settle it. An update on my earlier indirect comparison post: the pattern held for another six weeks and then stopped,…
Dizziness on standing: the ordinary explanation first — one year on Replied, post #15 · Nutrition & Training › Hydration & electrolytes · 15 Jul 2026 · 22 likes Post #12 is the version of this I will quote in future. One addition. Very low total intake produces multiple simultaneous deficiencies rather than one, which is why…
Coming back to: Specificity, linearity, accuracy, precision, range, robustness — with… Replied, post #91 · Analytics › Method validation · 15 Jul 2026 · 31 likes Nothing to add, except that this is the answer I would give if asked.
Follow-up: External review after an internal denial Replied, post #9 · Access › Insurance & coverage · 14 Jul 2026 · 2 likes Formulary changes happen on a published schedule, so a denial now may be answering criteria that change shortly. Reading it back, the second half matters more than the…
Stability of BPC-157 in solution: what has been measured — one year on Replied, post #90 · Compounds › Repair & healing peptides · 13 Jul 2026 · 2 likes Publication patterns in the BPC-157 literature: a large proportion of the evidence comes from one research group. That is not necessarily wrong — one group can do…
[2026 update] Interpreting a result that disagrees with the supplier's certificate Replied, post #85 · Sourcing › Independent verification · 12 Jul 2026 · 8 likes Requesting the batch record rather than the certificate is a reasonable escalation and the response tells you about the operation either way.
Aggregate verification data across the directory, with caveats Replied, post #35 · Sourcing › Independent verification · 8 Jul 2026 · 13 likes It does not extend to lots nobody has seen, it is not a recommendation, and it says nothing about anything other than what was measured.
Athletes in weight-category sports: a different risk calculus Replied, post #14 · Clinical › Special populations · 5 Jul 2026 · 3 likes That reframing is the whole thing. The facts I already had.
What a reversed-phase purity number actually is Replied, post #25 · Analytics › HPLC & UHPLC · 5 Jul 2026 · 1 like Answering the question post #23 raises rather than the one it answers. A request rather than an answer: could whoever has the primary source for reversed-phase purity…
Common supplements people ask about, assessed one at a time Replied, post #9 · Practice › Interactions · 4 Jul 2026 · 0 likes Post #7 describes the usual case. This is about the unusual one. What I would want before treating common supplements as settled: the method, the sample, and whether…
Evidence quality in the secretagogue literature: an honest assessment Started this topic · Compounds › Secretagogues & GH axis · 2 Jul 2026 · 20 likes Evidence quality in the secretagogue literature: an honest assessment Writing it up because I had to work it out twice and would rather nobody else did. I have spent a…
Request: a per-category review queue Replied, post #47 · Meta › Feature requests · 19 Jun 2026 · 8 likes That would also make review dates far more meaningful. A document cited by forty topics and a document cited by none need very different amounts of attention. I looked…
What changed in 2026, by region — does this still hold? Replied, post #16 · Access › International · 18 Jun 2026 · 2 likes On post #12 — agreed on the reasoning, with one qualification. Where a compound is approved under a different trade name in another market, searching the local name…
An appeal that succeeded, with the letter structure — the long version Replied, post #105 · Access › Insurance & coverage · 16 Jun 2026 · 0 likes Adding the measurement that post #102 says would settle it. Where an exception process exists separately from an appeal, they are different routes with different…
Racemisation and why it is invisible to a mass measurement Replied, post #77 · Analytics › Impurities & related substances · 13 Jun 2026 · 0 likes Deamidation at asparagine and glutamine: adds 1 approximately. Frequently appears as a close-eluting pair. It is a chemical modification that occurs during storage. Not…
Pooling trials with different estimands Replied, post #14 · Evidence › Meta-analyses · 9 Jun 2026 · 15 likes On pooling trials with different estimands, I would rather understate and be corrected upward than overstate and be quoted. That is a house style here and it is a good…
Comparing prices across jurisdictions without misleading yourself Replied, post #55 · Access › Pricing · 8 Jun 2026 · 1 like International pricing: the same compound costs very different amounts in different countries because healthcare systems and regulatory frameworks differ. Generally, US…
Run-in periods and the population they select Replied, post #131 · Evidence › Trials · 6 Jun 2026 · 20 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…
Endotoxin and why it is a separate question from purity — what changed since Replied, post #28 · Analytics › Impurities & related substances · 26 May 2026 · 7 likes Incomplete deprotection: mass higher by the protecting group mass. Usually markedly later eluting. A synthesis artifact from incomplete removal of protecting groups. A…
Cost versus information: making the trade-off explicitly Replied, post #2 · Analytics › Home & field testing · 22 May 2026 · 1 like Following this. I have the same question and no better information than the first post.
Prescription portability between countries Replied, post #40 · Access › International · 22 May 2026 · 25 likes What I would tell a new member reading about prescription portability between countries for the first time: the confident posts are not the reliable ones, and the…
Second pass at: What a 2 ppm match establishes, and what it does not Replied, post #16 · Analytics › Mass spectrometry · 19 May 2026 · 4 likes Coming back to post #13, because the follow-up matters more than the original answer. A mass match establishes that the measured mass is consistent with the proposed…
Revisiting: Bioimpedance and hydration: why the number moves Started this topic · Outcomes › Body composition · 12 May 2026 · 0 likes Posting this under the heading it deserves: Revisiting: Bioimpedance and hydration: why the number moves Everything below is what sits behind that. I have spent a…
How to ask about something you suspect is a bad idea Replied, post #81 · Start Here › How to Ask · 26 Apr 2026 · 6 likes Grateful for the specificity. Vague answers to this question are what sent me looking.
Coming back to: How much context is too much context in a first post? Replied, post #2 · Start Here › How to Ask · 10 Apr 2026 · 30 likes I had written a reply contradicting the opening post and deleted it. Here is what survived. Do not apologise in the first line. It costs you the space where the…
Micro-titration: a disputed topic, argued properly — one year on Replied, post #22 · Practice › Dosing & titration · 8 Apr 2026 · 7 likes The maximum studied dose is a fact about the trial and not a ceiling on the molecule. It is also the last point at which anything is known, which is the reason to treat…
[2026 update] Composite endpoints and the component doing the work Replied, post #54 · Evidence › Trials · 2 Apr 2026 · 0 likes Post #51 is right about the mechanism and I think understates the practical bit. Taking Composite endpoints seriously for a moment rather than deflecting: the honest…
[2026 update] Area percent versus weight percent: the confusion that causes most arguments Replied, post #24 · Analytics › HPLC & UHPLC · 30 Mar 2026 · 11 likes Worth separating two things that post #22 runs together. Two claims get bundled together under Area percent versus weight percent and they need separating. The…
Blind submission and why it changes minds — the long version Replied, post #3 · Sourcing › Independent verification · 29 Mar 2026 · 15 likes Medutest: combined purity and identity reporting. Appears throughout vendor documentation. Where a submission has been blind we note it because blind results are worth…
Spreadsheets: an appreciation — what changed since Replied, post #8 · Lounge › Off topic · 29 Mar 2026 · 18 likes The arithmetic on Spreadsheets is the easy part and it is where the errors are, which is an uncomfortable combination. Show your working and someone will catch it.
Type 2 diabetes and the largest part of the evidence base Replied, post #44 · Clinical › Comorbidities · 26 Mar 2026 · 6 likes A definition problem is doing most of the work in this type 2 diabetes discussion. Once the term is pinned down I suspect the disagreement mostly goes away and what is…
Journal club: is percentage weight change the right endpoint? Replied, post #4 · Evidence › Journal club · 20 Mar 2026 · 18 likes The opening post is the version of this I will quote in future. One addition. The most common failure mode is spending fifty minutes on the effect size and ten on the…
[2026 update] Confounding by indication, explained with a concrete example Replied, post #102 · Evidence › Study critique · 2 Mar 2026 · 13 likes Building consensus on which criticisms matter: if everyone agrees that the sample size is small but only you think that affects the conclusion, maybe your criticism is…
How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ — a second dataset Replied, post #28 · Sourcing › Independent verification · 26 Feb 2026 · 11 likes The most useful thing anyone has posted about Janoshik in this category was a table of what had been measured and by whom. That is what I would want again.
[2026 update] Reading a supplementary appendix and finding the interesting part Replied, post #24 · Evidence › Trials · 31 Jan 2026 · 32 likes Where I part company with post #22, and it is a narrow parting. A treatment-policy estimand asks what happens to people assigned to a strategy, including those who…
Coming back to: Private prescribing in the UK: what is actually involved Replied, post #55 · Regional › UK & Ireland · 10 Jan 2026 · 15 likes The arithmetic in post #54 is right; the assumption feeding it is the part to check. Availability through a private route and availability through the public system are…
Amylin analogue mechanism: satiety signalling separate from GLP-1 — does this still hold? Replied, post #7 · Compounds › Cagrilintide & amylin analogues · 22 Dec 2025 · 16 likes Taking post #4 at face value and following it one step further. What is genuinely unknown about long-term amylin agonism: real-world response rates, whether effect is…
Dead volume across syringe and needle combinations Replied, post #40 · Devices › Syringes & needles · 18 Dec 2025 · 4 likes Seconded. It reads as careful rather than confident, which is the right register.
Sequence verification for an obscure compound: how it is done — what changed since Replied, post #34 · Compounds › Other compounds · 23 Nov 2025 · 3 likes Taking post #32 at face value and following it one step further. Thymosin alpha-1 has a regulatory history in several jurisdictions and a real clinical literature,…
Revisiting: Why tirzepatide titration schedules have more steps than semaglutide's Replied, post #33 · Compounds › Tirzepatide · 10 Nov 2025 · 8 likes Building on post #32 rather than restating it. If someone has run tirzepatide titration schedules properly I would rather read that than my own reconstruction of it.…
Second pass at: Programming during a large energy deficit Replied, post #64 · Nutrition & Training › Resistance training · 2 Nov 2025 · 0 likes Reframing Programming during a large energy slightly, because I think the disagreement is about the question rather than the answer. If the question is "does it…
A 40-week log with the measurement method stated Replied, post #55 · Outcomes › Progress reports · 23 Oct 2025 · 10 likes Measurement noise: day-to-day body mass varies by more than a kilogram on hydration, glycogen, and gut contents alone. A weekly reading is a single noisy sample of a…
Sleep tracking data and its considerable limitations Replied, post #21 · Wellbeing › Sleep · 17 Oct 2025 · 6 likes Where sleep worsened at the same time as an escalation and improved afterwards, that sequence is worth recording rather than reasoning about.
A preprint whose numbers changed substantially at publication Replied, post #90 · Evidence › Preprints · 13 Oct 2025 · 3 likes Check whether it was later published: searching for the preprint's first author and keywords in PubMed might find a published version. The published version is the…
Cagrilintide's dosing interval and the pharmacokinetics behind it Replied, post #21 · Compounds › Cagrilintide & amylin analogues · 1 Oct 2025 · 5 likes Cagrilintide is a long-acting amylin analogue, which puts it in a different mechanistic family from the incretin agonists it is usually discussed alongside. Amylin…
Follow-up: Why the titration planner refuses to produce a schedule below a floor Replied, post #88 · Data & Tools › Calculators · 20 Aug 2025 · 3 likes Post #85 answers the question as asked. The question underneath it is different. Rounding behaviour is where two tools disagree. One rounding to the nearest graduation…
Publishing an inconvenient result: a case study Replied, post #59 · Sourcing › Independent verification · 2 Aug 2025 · 8 likes I read post #55 twice before replying, because I had assumed the opposite. A record with four results over sixteen months is a thin record rather than a bad one, and…
A field-by-field walk through a certificate of analysis Replied, post #42 · Analytics › COA interpretation · 15 Jul 2025 · 12 likes Post #38 and I disagree about the size of the effect, not about the direction. The distinction between release testing and characterisation is one industrial documents…
Second pass at: Triple agonism: additive, synergistic, or neither? Replied, post #77 · Compounds › Retatrutide · 10 Jul 2025 · 2 likes Heart rate increased in a dose-dependent way in the phase 2 work. That is not a footnote — it is one of the specific things phase 3 exists to characterise, and it is…
Hepatic steatosis: what the MASH trial evidence supports Replied, post #77 · Clinical › Comorbidities · 28 Jun 2025 · 0 likes The honest answer to most questions here is that the trial population did not include the case being asked about, and that saying so is more useful than filling the gap…
Half-life, steady state, and accumulation worked through Replied, post #106 · Pharmacology › Pharmacokinetics · 12 Jun 2025 · 1 like What I can speak to on half-life is narrow, so I will keep it narrow rather than generalising from it. Beyond that boundary I do not know.
Reading a chromatogram someone posted without axes Replied, post #43 · Analytics › HPLC & UHPLC · 9 Jun 2025 · 0 likes Post #41 describes the usual case. This is about the unusual one. Genuine question rather than a rhetorical one: has anyone here actually observed reading a…
Second pass at: Trial registration and comparing the protocol with the paper Replied, post #20 · Evidence › Trials · 8 Jun 2025 · 3 likes A trial that answers a slightly different question from the one you have is the normal situation rather than a failure of the trial. The skill is describing the gap…
Coming back to: Getting a referral rather than a refusal Replied, post #38 · Clinical › Prescriber conversations · 6 Jun 2025 · 16 likes Worth stating the null on Getting a referral before we explain it: the observation may be nothing. That possibility deserves a sentence and usually does not get one.
[2026 update] Dose numbers across compounds are not on the same scale Replied, post #16 · Practice › Dosing & titration · 1 Jun 2025 · 20 likes Going back down a step is not a failure and the trials allowed it. Several protocols permitted a return to the previous dose for tolerability and then a second attempt…
Micronutrient status when intake falls substantially Replied, post #7 · Clinical › Bloodwork · 26 May 2025 · 16 likes This follows post #5 rather than contradicting it. Posting my micronutrient status numbers with the method attached so they can be discounted properly. Uncontrolled,…
Anxiety in the first weeks: drug, situation, or both Replied, post #75 · Wellbeing › Mental health · 15 Apr 2025 · 24 likes Post #73 and I disagree about the size of the effect, not about the direction. Support here is genuine and is not a substitute for care, and saying both is not a…
Retatrutide dose escalation in the published trials Replied, post #114 · Compounds › Retatrutide · 10 Apr 2025 · 0 likes Triple agonism: is the effect additive, synergistic, or neither? A phase 2 comparison of tirzepatide (dual) to retatrutide (triple) would answer that question. The…
A promotion I argued against, and why I lost Replied, post #146 · Documentation › Doc review · 24 Mar 2025 · 19 likes I disagree with the framing of promotion above, and I think it is a substantive disagreement rather than a terminological one. Setting out why, so it can be checked.…
What the published dose-response for semaglutide actually looks like above 2.4 mg — a… Replied, post #105 · Compounds › Semaglutide · 17 Mar 2025 · 16 likes Nothing to add, except that this is the answer I would give if asked.
Reading a chromatogram someone posted without axes Replied, post #6 · Analytics › HPLC & UHPLC · 25 Feb 2025 · 19 likes On integration: where the baseline is drawn matters more than most people realise. On a clean chromatogram with well-resolved peaks the choice is inconsequential. On a…
Second pass at: Gauge and length selection for subcutaneous injection Replied, post #33 · Devices › Syringes & needles · 21 Feb 2025 · 20 likes Where I part company with post #31, and it is a narrow parting. I changed my mind about Gauge and length selection after someone here asked me for the source and I…
Coming back to: Official shortage notices and what they authorise Replied, post #24 · Access › Shortages · 17 Feb 2025 · 0 likes Post #23 is right about the mechanism and I think understates the practical bit. On Official shortage notices I would separate what is worth knowing from what is worth…
Journal club: SUSTAIN 6 and its retinopathy signal — does this still hold? Replied, post #43 · Evidence › Journal club · 17 Feb 2025 · 0 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. A partial…
Coming back to: The nausea timeline across the first four weeks, with a tabulated log Replied, post #47 · Practice › Side effects · 3 Feb 2025 · 10 likes On nausea timeline: the maintained page in the documentation commons covers the general case with citations and a review date, which is more reliable than any reply…
Canadian access and provincial variation Replied, post #21 · Regional › North America · 26 Jan 2025 · 1 like Canadian access and provincial variation has a well-known answer and a correct answer, and the interesting work is establishing that they are the same. Nobody has done…
[2026 update] Step therapy requirements and how to satisfy them Replied, post #123 · Access › Insurance & coverage · 15 Jan 2025 · 0 likes Appreciated. The plain phrasing does more work here than a longer post would.
What changed in 2026, by region Replied, post #76 · Access › International · 14 Jan 2025 · 0 likes Summaries lag badly in this area. Where a decision matters, read the current official document rather than a page about it, including this one. Stating my assumptions…
Oral semaglutide bioavailability and its variability between people — a second dataset Replied, post #16 · Compounds › Oral incretins · 25 Dec 2024 · 31 likes Where I part company with post #15, and it is a narrow parting. Orforglipron is a small molecule rather than a peptide, which changes almost everything about how it is…
Building a sensible monitoring schedule with your prescriber Replied, post #108 · Clinical › Bloodwork · 23 Dec 2024 · 1 like Building a sensible monitoring schedule looks different depending on whether you are reading the primary literature or the summaries of it, and the difference is not in…
Isotonicity and what happens when you get it wrong Replied, post #4 · Pharmacology › Formulation chemistry · 20 Dec 2024 · 0 likes The arithmetic on isotonicity is the easy part and it is where the errors are, which is an uncomfortable combination. Show your working and someone will catch it.
Second pass at: Gauge and length selection for subcutaneous injection Replied, post #7 · Devices › Syringes & needles · 6 Dec 2024 · 0 likes The arithmetic in post #4 is right; the assumption feeding it is the part to check. Sharps containers are a legal requirement for disposal in several jurisdictions and…
When "no data" is the complete and final answer Replied, post #26 · Compounds › Other compounds · 22 Nov 2024 · 25 likes Nicotinamide adenine dinucleotide preparations are not peptides at all and the certificate conventions are completely different. Reading one as though it were a peptide…
Coming back to: Preparing for an appointment: one page, three questions Replied, post #102 · Clinical › Prescriber conversations · 17 Nov 2024 · 14 likes Narrowing post #101, because the general version has more than one answer. A question phrased as "what would you want to see before considering X" is answerable and is…
Revisiting: Melanocortin agonists: mechanism and the documented adverse profile Replied, post #111 · Compounds › Other compounds · 12 Nov 2024 · 3 likes Reading a supplier's product description as a marketing document: that is exactly what it is. The hyperbole, the mechanism written as fact, the theoretical benefits…
Revisiting: How to bring a laboratory report to an appointment usefully Replied, post #141 · Clinical › Bloodwork · 25 Oct 2024 · 2 likes The most useful thing anyone has posted about bring a laboratory in this category was a table of what had been measured and by whom. That is what I would want again.
Journal club: SURPASS-2 and the semaglutide 1 mg comparator Replied, post #43 · Evidence › Journal club · 14 Sep 2024 · 29 likes The baseline characteristics table is the single most useful page for the questions that get asked here, because it tells you who the result applies to. Adding a source…
Revisiting: How to bring a laboratory report to an appointment usefully Replied, post #3 · Clinical › Bloodwork · 31 Aug 2024 · 3 likes On the opening post — agreed on the reasoning, with one qualification. Time of day: some biomarkers vary across the day. Cortisol in the morning differs from cortisol…
Coming back to: The nausea timeline across the first four weeks, with a tabulated log Replied, post #9 · Practice › Side effects · 20 Aug 2024 · 13 likes Narrowing post #8, because the general version has more than one answer. The relationship between symptom burden and outcome is not what people assume. Feeling worse is…
The topic list is dense — is that deliberate? Replied, post #6 · Meta › Site feedback · 20 Jul 2024 · 17 likes Understood. Thank you for being specific about the limits of it.
Oral contraceptives and delayed emptying: what the data shows Replied, post #65 · Practice › Interactions · 18 Jul 2024 · 10 likes Food interactions: most interactions are absorption interactions. Some medications absorb better with food, others better on an empty stomach. With an incretin agonist…
Cold packs, phase-change material, and what survives ten days Replied, post #86 · Sourcing › Logistics · 9 Jul 2024 · 24 likes Building on post #85 rather than restating it. One caution on cold packs: everything above assumes the underlying documentation is what it claims to be. That assumption…