s.duarte

TL2 · Faro

Contributes reviews on supplier material. Based in Faro.

Joined 30 March 2025 · last posted 1d

85 posts, newest first. Showing up to 150.

About the Shortages category Replied, post #8 · Access › Shortages · 26 Jul 2026 · 0 likes Shortages end and the notices are updated. Checking the current notice takes a minute and is more reliable than a thread from March.
Immortal time bias in a claims-database study — one year on Replied, post #44 · Evidence › Study critique · 25 Jul 2026 · 19 likes Coming back to post #42, because the follow-up matters more than the original answer. On Immortal time bias, the part that usually goes wrong is that the question is…
Why retatrutide discussion here is more cautious than elsewhere — one year on Replied, post #90 · Compounds › Retatrutide · 24 Jul 2026 · 0 likes Nausea and vomiting were dose-related in the phase 2 work, as they are throughout this class. What is not established is whether the tolerability profile differs from…
[2026 update] Travelling with an injectable: documentation and practicalities Replied, post #100 · Access › International · 22 Jul 2026 · 2 likes Country-by-country legality: compound approval and legal status differ substantially by jurisdiction. Semaglutide approved in the United States and European Union;…
What to include when your question involves a chromatogram — one year on Replied, post #76 · Start Here › How to Ask · 14 Jul 2026 · 8 likes A photograph of a vial is rarely useful and a photograph of a document usually is. Redact the identifiers before you post either.
Osteoarthritis and mechanical versus metabolic improvement — one year on Replied, post #11 · Clinical › Comorbidities · 9 Jul 2026 · 30 likes Nothing here is medical advice and clinicians posting in this subcategory say so on their own account rather than because a rule requires it.
Sleep apnoea improving and the equipment implications Replied, post #5 · Wellbeing › Sleep · 12 Jun 2026 · 0 likes Sleep hygiene: basics (cool dark room, consistent sleep time, no screens before bed) matter more during energy deficit because stress and sleep need are higher. The…
Preservatives: function, testing, and limits — one year on Replied, post #22 · Pharmacology › Formulation chemistry · 7 Jun 2026 · 0 likes Same experience here, different supplier, so it is at least not unique to one of them.
Tracking a shortage from primary sources rather than rumour Replied, post #39 · Access › Shortages · 6 Jun 2026 · 9 likes Regional differences during a shortage are large, and a supply position in one country says nothing about another.
Comparing prices across jurisdictions without misleading yourself Replied, post #20 · Access › Pricing · 30 May 2026 · 0 likes Helpful, and short, which on this subject is harder than long.
Why fasting instructions for oral semaglutide are not optional advice Replied, post #8 · Compounds › Oral incretins · 19 May 2026 · 3 likes Adding the measurement that post #5 says would settle it. Oral versus injectable exposure: comparing a 14 mg oral dose with a 0.5 mg injectable dose is comparing apples…
Semaglutide and gastric emptying — the mechanism behind most of the side-effect profile Replied, post #32 · Compounds › Semaglutide · 19 May 2026 · 0 likes This follows post #31 rather than contradicting it. Semaglutide versus liraglutide in STEP 8: semaglutide produced greater weight reduction and the discontinuation…
[2026 update] Storing lyophilised material long term: what governs the shelf life Replied, post #115 · Practice › Storage & stability · 13 May 2026 · 0 likes Container choice matters: the material of the vial, the rubber closure, the fill volume all affect how quickly the contents degrade. Smaller fill volumes lose less to…
[2026 update] 0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Replied, post #111 · Devices › Syringes & needles · 12 May 2026 · 24 likes U-100 means the barrel is graduated for a solution containing one hundred units of insulin per millilitre. For anything that is not insulin, the units are simply…
Whether an aggregate is worth publishing at all: a disputed topic — does this still hold? Replied, post #17 · Data & Tools › Datasets · 8 May 2026 · 0 likes Agreed on Whether an aggregate, with one qualification that I think matters. The reasoning holds for the case as described. Change the starting assumption and it does…
Coming back to: A structured critique template this community uses Replied, post #6 · Evidence › Study critique · 4 May 2026 · 0 likes Attrition is the failure mode most likely to invalidate a result and the least likely to be discussed. Differential attrition between arms is the specific thing to look…
Journal club: LEADER as the historical anchor Replied, post #69 · Evidence › Journal club · 4 May 2026 · 3 likes Where the LEADER reasoning breaks down for me is the step from the group result to the individual case. That step is almost never argued for.
Fasting versus non-fasting and which tests care Replied, post #22 · Clinical › Bloodwork · 3 May 2026 · 0 likes Picking up post #21: that is the part I would want checked first. I disagree with the framing of fasting versus non-fasting above, and I think it is a substantive…
Revisiting: What pooling buys you and what it destroys Replied, post #11 · Evidence › Meta-analyses · 2 May 2026 · 15 likes Adding a null result on pooling buys. I looked, carefully, and found nothing, and null results deserve posting precisely because they never are.
Reflectance and photometric devices: precision in practice — a second dataset Replied, post #10 · Analytics › Home & field testing · 13 Apr 2026 · 33 likes Ultraviolet absorbance at 280 nanometres estimates concentration for peptides containing aromatic residues and gives nothing for peptides that do not. Knowing which…
Type 2 diabetes and the largest part of the evidence base — does this still hold? Replied, post #4 · Clinical › Comorbidities · 12 Apr 2026 · 12 likes A condition that affects nutrition or absorption changes the calculus around a treatment that reduces intake, and that interaction is mostly unstudied. I checked the…
Bug report: the reconstitution calculator and a rounding edge case Replied, post #46 · Data & Tools › Calculators · 7 Apr 2026 · 7 likes Do the arithmetic by hand the first few times, whatever tool you use afterwards. A calculator with a wrong input gives a confident wrong answer and there is nothing in…
Follow-up: State-level differences that actually matter Replied, post #38 · Regional › North America · 6 Apr 2026 · 3 likes The denial letter is the specification for the appeal. It states a criterion and the job is to demonstrate that criterion in the letter's own language. Happy to expand…
Coming back to: Semaglutide in people without diabetes: what the evidence base looks like Replied, post #45 · Compounds › Semaglutide · 30 Mar 2026 · 1 like On identity confirmation: a mass close to 4113.6 Da on the intact molecule is consistent with semaglutide and is also consistent with several closely related species.…
Grapefruit: why this class is not the class that cares Replied, post #39 · Practice › Interactions · 14 Mar 2026 · 8 likes Adding the measurement that post #36 says would settle it. Grapefruit is one of those subjects where the general answer and the answer for a specific case diverge, and…
Reading U-100 graduations, with a conversion table Replied, post #13 · Devices › Syringes & needles · 24 Feb 2026 · 9 likes I disagree with the framing of reading U-100 graduations above, and I think it is a substantive disagreement rather than a terminological one. Setting out why, so it…
Coming back to: Reading a supplier's product description as a marketing document Replied, post #35 · Compounds › Other compounds · 24 Feb 2026 · 10 likes A compound with no established assay is a compound where a certificate can say almost anything. That is not an accusation about anyone; it is a statement about what a…
Publication bias detection and its low power — does this still hold? Replied, post #12 · Evidence › Meta-analyses · 15 Feb 2026 · 0 likes The version of Publication bias detection that circulates here is a simplification of a simplification. It is not wrong, but it has lost the conditions under which it…
Shoulders, tangent skims, and defensible integration — the long version Replied, post #12 · Analytics › HPLC & UHPLC · 11 Feb 2026 · 5 likes I had written a reply contradicting post #8 and deleted it. Here is what survived. A shoulder on the trailing edge is most often a closely related species rather than…
Stepping down deliberately, and how to do it without losing progress Replied, post #55 · Practice › Dosing & titration · 8 Feb 2026 · 11 likes The starting dose in most of these programmes is a tolerance step and produces little effect by design. Judging the compound at the starting dose is judging the wrong…
Storing lyophilised material long term: what governs the shelf life Replied, post #35 · Practice › Storage & stability · 22 Jan 2026 · 15 likes Post #33 put the caveat in the right place and I want to underline it. Temperature excursions: if a vial sat at room temperature for a time, the question is whether the…
Why a compound being unapproved is not the same as being illegal to possess Replied, post #50 · Sourcing › Regulatory · 16 Jan 2026 · 5 likes Generic or biosimilar entry depends on patent and exclusivity positions that are jurisdiction-specific and are frequently misreported. Somebody will have a better…
Why an oral GLP-1 agonist is a formulation achievement more than a chemistry one Replied, post #126 · Compounds › Oral incretins · 3 Jan 2026 · 0 likes Post #125 put the caveat in the right place and I want to underline it. The absorption enhancer in the licensed oral product works by transiently raising local gastric…
Coming back to: The SOUL trial and oral semaglutide cardiovascular outcomes Replied, post #80 · Compounds › Oral incretins · 30 Dec 2025 · 4 likes Why an oral formulation is a formulation achievement: the molecule is the same but the tablet is novel. Getting a peptide across the gastric epithelium at usable…
What "marked as solution" means and who gets to mark it — does this still hold? Replied, post #24 · Start Here › Welcome · 25 Dec 2025 · 32 likes Reading rather than answering, but this is the post I would point somebody at.
About the Other compounds category Replied, post #4 · Compounds › Other compounds · 18 Dec 2025 · 7 likes Suggestion for the wiki post above: it would be worth linking the two or three most-referenced topics in this category directly, since new members reliably ask for…
The decimal-point error, and the habit that catches it Replied, post #104 · Practice › Reconstitution · 18 Dec 2025 · 26 likes I had written a reply contradicting post #103 and deleted it. Here is what survived. Do not shake. Swirl, or leave it. Vigorous agitation introduces air and shear, and…
Tracking a preprint to publication: a worked example Replied, post #125 · Evidence › Preprints · 12 Dec 2025 · 19 likes Having read the whole tracking a preprint thread before replying: the question in the first post has not actually been answered yet, and three of us have answered a…
Tracking that stops updating and then resumes — the long version Replied, post #33 · Sourcing › Logistics · 2 Nov 2025 · 15 likes The arithmetic in post #30 is right; the assumption feeding it is the part to check. Carrier handover between an international and a domestic service is where tracking…
Detection wavelength and why 214 nm and 280 nm disagree Replied, post #71 · Analytics › HPLC & UHPLC · 26 Oct 2025 · 0 likes I have been on both sides of the detection wavelength argument in this category within eighteen months, which should tell you how strong the evidence for either side is.
What happens after your first post: likes, trust levels, and why none of it matters much… Replied, post #53 · Start Here › Welcome · 17 Oct 2025 · 23 likes Introducing yourself is fine and requires no question. Post in this subcategory, describe the context that matters for why you are here, and lurk for a bit before…
Liver enzymes drifting down and what that usually means Replied, post #18 · Clinical › Bloodwork · 12 Oct 2025 · 7 likes A note on how liver enzymes drifting gets discussed rather than on liver enzymes drifting itself: the confident posts get the replies and the careful ones get ignored,…
The most useful thing you learned here that was not the answer you came for — a second… Replied, post #80 · Lounge › Off topic · 7 Oct 2025 · 3 likes Adjacent thought. The thing that first surprised me here was that the strongest posts are usually the ones setting out what cannot be concluded. Everywhere else that…
MHRA statements, read directly Replied, post #9 · Regional › UK & Ireland · 29 Sep 2025 · 0 likes Cross-border movement between the two jurisdictions is not the same as domestic movement within either, and the rules are published rather than inferred. Noting that…
Compounds this community declines to help with, and why Replied, post #29 · Compounds › Other compounds · 29 Sep 2025 · 0 likes Colour in a lyophilised cake is worth noting for the less common compounds specifically, because some of them are genuinely not white and a member expecting white will…
A payment that went through twice: how it was resolved Replied, post #4 · Sourcing › Payments · 21 Sep 2025 · 5 likes Recurring billing: if a supplier sets up recurring billing by default, understanding the terms for cancellation is important before the first charge.
Payment method and the leverage it gives you, ranked Replied, post #26 · Sourcing › Payments · 17 Sep 2025 · 0 likes Agreed, and I will stop repeating the version of this I had been repeating.
Publishing an inconvenient result: a case study Replied, post #69 · Sourcing › Independent verification · 20 Aug 2025 · 0 likes Post #68 is the version of this I will quote in future. One addition. On publishing an inconvenient result: the maintained page in the documentation commons covers the…
Immortal time bias in a claims-database study Replied, post #16 · Evidence › Study critique · 8 Aug 2025 · 0 likes Post #15 put the caveat in the right place and I want to underline it. Two questions I would want answered before drawing anything from the immortal time bias data…
A ten-fold dose error caught before injection — one year on Replied, post #75 · Devices › Syringes & needles · 3 Aug 2025 · 0 likes Syringe barrel size: common sizes are 0.3 mL, 0.5 mL, and 1.0 mL. Smaller barrels are more legible for small doses. Larger barrels hold larger volumes. Choose based on…
[2026 update] What we do not know about retatrutide, listed explicitly Replied, post #33 · Compounds › Retatrutide · 3 Aug 2025 · 0 likes Why this subcategory is more cautious than elsewhere: retatrutide is investigational, phase 3 is ongoing, and the heart-rate signal in phase 2 is not negligible.…
Which panel is worth repeating and which is worth ignoring Replied, post #74 · Clinical › Bloodwork · 1 Aug 2025 · 3 likes On post #72 — agreed on the reasoning, with one qualification. The most useful thing anyone has posted about panel in this category was a table of what had been…
Tracking that stops updating and then resumes Replied, post #14 · Sourcing › Logistics · 31 Jul 2025 · 1 like Post #12 is the version of this I will quote in future. One addition. Document outcomes rather than forecasting them. A forecast in this category reads as reassurance…
Revisiting: Reading a denial letter as a specification for your appeal Replied, post #56 · Access › Insurance & coverage · 25 Jul 2025 · 0 likes Post #53 answers the question as asked. The question underneath it is different. Summarising the Reading a denial letter thread so far, since it is long and the answer…
BPC-157: what the rodent literature actually shows, and what it does not — a second… Replied, post #73 · Compounds › Repair & healing peptides · 21 Jul 2025 · 4 likes Summarising the BPC-157 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 rest is…
[2026 update] Constipation management, with a dietitian's contribution Replied, post #8 · Practice › Side effects · 2 Jul 2025 · 0 likes The published rates come from populations that were titrated on a defined schedule with clinical supervision. Rates from a forum are not comparable and are biased by…
Regression to the mean in progress reports Replied, post #27 · Research Methods › Statistics · 1 Jul 2025 · 0 likes Percentages of small denominators should be reported with the denominator. Two out of three is not sixty-seven per cent in any useful sense.
Journal club: the CagriSema phase 2 combination paper — a second dataset Replied, post #60 · Evidence › Journal club · 30 Jun 2025 · 0 likes Worth separating two things that post #58 runs together. The reason CagriSema phase 2 combination paper keeps being re-asked is that the answer is conditional and…
Domestic fridge temperature mapping: a cheap experiment — what changed since Replied, post #132 · Devices › Cold chain · 29 Jun 2025 · 5 likes What I would want before treating Domestic fridge temperature mapping as settled: the method, the sample, and whether anyone tried to find the opposite result. Two of…
Promotion criteria, and the one that stops most nominations — the long version Replied, post #15 · Documentation › Doc review · 20 Jun 2025 · 1 like No notes. Posting so the count is not one.
A report I filed that turned out to be wrong, and the correction Replied, post #106 · Sourcing › Vendor reports · 16 Jun 2025 · 31 likes Reading rather than contributing, but this is the most useful thread I have found on it.
An emergency department visit, described afterwards Replied, post #23 · Safety › Adverse events · 22 May 2025 · 5 likes I had written a reply contradicting post #21 and deleted it. Here is what survived. Source for the emergency department visit figure, since it was asked for. It is in…
Albumin binding and how it produces a long half-life Replied, post #32 · Pharmacology › Pharmacokinetics · 4 May 2025 · 7 likes Accumulation at steady state: with a week-long half-life, steady-state concentration is reached around 4 to 5 half-lives (about 4 to 5 weeks). Before that,…
Revisiting: Oral versus injected administration claims for BPC-157 Replied, post #21 · Compounds › Repair & healing peptides · 20 Apr 2025 · 1 like This is the sort of exchange that makes the archive worth searching.
Second pass at: Retatrutide mass and identity: what a report should show Replied, post #24 · Compounds › Retatrutide · 18 Apr 2025 · 28 likes Why this subcategory is more cautious than elsewhere: retatrutide is investigational, phase 3 is ongoing, and the heart-rate signal in phase 2 is not negligible.…
Second pass at: Triple agonism: additive, synergistic, or neither? Replied, post #39 · Compounds › Retatrutide · 18 Apr 2025 · 0 likes The hepatic-steatosis rationale follows directly from glucagon receptor agonism promoting fat oxidation in the liver. Mechanistic plausibility in this field has a poor…
Second pass at: Pen dose counters: what a click does and does not guarantee Replied, post #16 · Devices › Pens & autoinjectors · 11 Apr 2025 · 13 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…
When a preprint is the best available evidence and we say so — a second dataset Replied, post #16 · Evidence › Preprints · 14 Mar 2025 · 0 likes Worth separating two things that post #12 runs together. Sample size and pre-registration are checkable in a preprint exactly as in a paper, and they carry the same…
Counter-ion form: the field almost nobody reports — one year on Replied, post #18 · Analytics › COA interpretation · 22 Feb 2025 · 21 likes Picking up post #15: that is the part I would want checked first. A chromatogram supplied as a small image is legible for peak shape and not for baseline detail. That…
Second pass at: Regression to the mean in progress reports Replied, post #35 · Research Methods › Statistics · 25 Jan 2025 · 4 likes The version of Regression that I was taught turned out to be a teaching simplification. Useful, and not true in the way I had assumed it was.
Albumin binding and how it produces a long half-life Started this topic · Pharmacology › Pharmacokinetics · 20 Jan 2025 · 0 likes Albumin binding and how it produces a long half-life — setting out what I have, and where I think it stops being reliable. A narrow question about albumin binding,…
Transit times by route, from a logged dataset — the long version Replied, post #50 · Sourcing › Logistics · 17 Jan 2025 · 0 likes The strongest argument against my own position on Transit times, stated as well as I can state it, since nobody else has yet.
Triple agonism: additive, synergistic, or neither? Replied, post #7 · Compounds › Retatrutide · 30 Dec 2024 · 1 like Triple agonism is well covered in the tag pages, and the older discussions are better than the recent ones because they were argued out properly. Worth twenty minutes…
Transporting a vial for a weekend away Replied, post #22 · Practice › Storage & stability · 1 Nov 2024 · 4 likes Clarity is a weak test. A solution can lose a significant fraction of its active content to degradation or adsorption while remaining perfectly clear.
Irish differences from the UK position Replied, post #62 · Regional › UK & Ireland · 28 Oct 2024 · 0 likes Worth separating two things that post #60 runs together. Worth stating the null on irish differences before we explain it: the observation may be nothing. That…
Second pass at: Buffers, pH and why a formulation is a formulation Replied, post #12 · Pharmacology › Formulation chemistry · 23 Oct 2024 · 4 likes Everything in post #8 holds. The case it does not cover is the one I have. Adding a reference point for Buffers. Mine is a single case, collected without controls, and…
Semaglutide half-life: where the 165 to 184 hour figure comes from — what changed since Replied, post #21 · Compounds › Semaglutide · 6 Oct 2024 · 18 likes Is there a ceiling dose beyond which the effect plateaus? The trials did not study that because they stopped at 2.4 mg. Some people report trying higher doses, but…
Revisiting: How to bring a laboratory report to an appointment usefully Replied, post #82 · Clinical › Bloodwork · 5 Oct 2024 · 18 likes Adding the measurement that post #81 says would settle it. An observation about bring a laboratory that I cannot explain and am posting anyway, on the principle that…
Second pass at: Sodium, potassium and magnesium when intake drops Replied, post #121 · Nutrition & Training › Hydration & electrolytes · 28 Sep 2024 · 6 likes Post #118 answers the question as asked. The question underneath it is different. Sodium has been discussed here with more heat than it deserves, mostly because two…
Converting between mg/mL and units per dose, both directions Replied, post #32 · Practice › Reconstitution · 27 Sep 2024 · 6 likes Post #31 is the version of this I will quote in future. One addition. Two people can reconstitute the same vial to different concentrations and both be right. The dose…
Revisiting: A staff appointment, and what the role involves Replied, post #2 · Meta › Announcements · 14 Sep 2024 · 0 likes Staff announcements, policy changes, and scheduled maintenance. Read-only except for questions clarifying what was announced.
Guidelines revision: what changed and why Replied, post #124 · Meta › Announcements · 28 Jul 2024 · 13 likes Worth separating two things that post #121 runs together. I would put moderate confidence on the mainstream reading of guidelines revision and no more. That is not…
The mass-error checker and its intended scope Replied, post #159 · Data & Tools › Calculators · 27 Jul 2024 · 15 likes Precision and significant figures: the calculators do not round to match your input precision. If you input values to one decimal place, the output might have more. Use…
Oral contraceptives and delayed emptying: what the data shows Replied, post #30 · Practice › Interactions · 11 Jul 2024 · 15 likes Where a published interaction study exists it usually reports an area-under-curve ratio, and that number is far more informative than a yes-or-no answer. I would be…
Spreadsheets: an appreciation Replied, post #21 · Lounge › Off topic · 8 Jun 2024 · 4 likes Two sentences on spreadsheets and then I will stop, because the rest is speculation and the thread is better without mine. What is documented is narrow. What is…