s.teixeira

TL2 · Galway

Contributes reviews on supplier material. Based in Galway.

Joined 3 February 2025 · last posted 4d

70 posts, newest first. Showing up to 150.

Revisiting: The best-written scientific paper you have read Replied, post #112 · Lounge › Off topic · 24 Jul 2026 · 30 likes Science communication: if you come across an interesting science paper or article about peptides or metabolism, sharing it and discussing the idea is on-topic. That is…
Common supplements people ask about, assessed one at a time Replied, post #80 · Practice › Interactions · 22 Jul 2026 · 3 likes Everything in post #76 holds. The case it does not cover is the one I have. The version of common supplements that circulates here is a simplification of a…
Coming back to: Time to steady state after a dose increase Replied, post #107 · Pharmacology › Pharmacokinetics · 22 Jul 2026 · 0 likes Picking up post #104: that is the part I would want checked first. Metabolism for peptide drugs is proteolytic rather than hepatic in the usual sense, which is why the…
Reading a rodent study on a secretagogue without over-extrapolating — the long version Replied, post #33 · Compounds › Secretagogues & GH axis · 10 Jul 2026 · 7 likes Reading a rodent study on a secretagogue without over-extrapolating: rodent studies can show a mechanism is plausible. They cannot show magnitude of effect in humans or…
Follow-up: How compounding permissions changed when supply normalised Started this topic · Sourcing › Regulatory · 8 Jul 2026 · 5 likes How compounding permissions changed when supply normalised I have a specific reason for asking rather than idle curiosity, and the context is below. I was wrong about…
Reused chromatograms across lots: how to spot it Replied, post #54 · Analytics › COA interpretation · 2 Jul 2026 · 6 likes On reused chromatograms across lots 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…
Coming back to: Swirling versus inverting versus leaving it alone Replied, post #25 · Practice › Reconstitution · 2 Jul 2026 · 6 likes My understanding of Swirling versus inverting versus leaving is a few years old and may have been superseded. If it has been, I would genuinely like to know rather than…
Private prescribing in the UK: what is actually involved Replied, post #45 · Regional › UK & Ireland · 22 Jun 2026 · 32 likes Anyone quoting an eligibility threshold should say which document it comes from. The thresholds have changed and the old ones are still circulating. That is the…
[2026 update] Travelling with an injectable: documentation and practicalities Replied, post #26 · Access › International · 20 Jun 2026 · 27 likes The arithmetic in post #25 is right; the assumption feeding it is the part to check. Temperature-controlled material and long-haul travel is a practical problem with…
Second pass at: Leak-back after withdrawal and whether you lost a meaningful dose Replied, post #20 · Practice › Administration · 17 Jun 2026 · 0 likes Answering the question post #18 raises rather than the one it answers. The strongest argument against my own position on Leak-back, stated as well as I can state it,…
Primary endpoint hierarchies and why order matters — one year on Replied, post #10 · Evidence › Trials · 8 Jun 2026 · 18 likes I had written a reply contradicting post #8 and deleted it. Here is what survived. Absolute numbers, not just relative: a 30% relative reduction tells you the ratio but…
Tracking intake honestly when appetite is absent Replied, post #46 · Nutrition & Training › Protein & intake · 3 Jun 2026 · 5 likes Density matters more than quantity when total intake is limited. The same protein in a smaller volume is the whole game. The uncertainty is in the assumption, not in…
Journal club: orforglipron phase 2 and the non-peptide question Replied, post #79 · Evidence › Journal club · 1 Jun 2026 · 4 likes The figures usually contain the finding and the text usually contains the interpretation. Separating them for the first twenty minutes is a discipline worth keeping.…
Peak-to-trough ratio at steady state for a weekly agent Replied, post #17 · Pharmacology › Pharmacokinetics · 31 May 2026 · 9 likes The honest answer on peak-to-trough ratio 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 matter.…
Molecular mass of semaglutide and why the figure differs between sources Replied, post #67 · Compounds › Semaglutide · 30 May 2026 · 0 likes Where I part company with post #63, and it is a narrow parting. Taking molecular mass of semaglutide seriously for a moment rather than deflecting: the honest position…
[2026 update] A vial that will not fully dissolve: what to check and in what order Replied, post #78 · Practice › Reconstitution · 29 May 2026 · 23 likes Confirming post #75 from a second method, which matters more than confirming it from a second person. A 10 mg vial reconstituted three different ways: 1 mL diluent…
Review: a draft on reconstitution arithmetic, with objections — one year on Replied, post #18 · Documentation › Doc review · 27 May 2026 · 7 likes Objections are genuinely wanted at this stage, because a bad promotion is much harder to undo than a bad reply. The short version is the first sentence; the rest is why.
Second pass at: Absence of evidence and evidence of absence Replied, post #7 · Research Methods › Statistics · 22 May 2026 · 0 likes Appreciated. The plain phrasing does more work here than a longer post would.
How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ — does this still hold? Replied, post #16 · Sourcing › Independent verification · 20 May 2026 · 12 likes Building on post #15 rather than restating it. My position on Janoshik is current rather than settled. I have revised it once already and I expect to again, so treat it…
A checklist for reading a certificate in under two minutes Replied, post #17 · Analytics › COA interpretation · 8 May 2026 · 31 likes Confirming post #16 from a second method, which matters more than confirming it from a second person. An itemised related-substances table with retention times says…
Coming back to: Specificity, linearity, accuracy, precision, range, robustness — with… Replied, post #13 · Analytics › Method validation · 5 May 2026 · 6 likes Precision has two levels worth distinguishing: repeatability within a run and intermediate precision across days, analysts and instruments. The second is where most…
[2026 update] Charge states for a 4 kDa peptide, worked through Replied, post #46 · Analytics › Mass spectrometry · 1 Apr 2026 · 18 likes Answering the question post #44 raises rather than the one it answers. Resolution: "high resolution" commonly means Worth reading the earlier posts in this thread…
About the Storage & stability category Replied, post #4 · Practice › Storage & stability · 16 Mar 2026 · 0 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…
Pharmacy supply in the UK and the questions you will be asked Replied, post #76 · Regional › UK & Ireland · 14 Mar 2026 · 0 likes Adding the measurement that post #74 says would settle it. Reading this pharmacy supply thread as someone who came in with a fixed view: the third and seventh replies…
Constipation management, with a dietitian's contribution Replied, post #36 · Practice › Side effects · 3 Mar 2026 · 0 likes Confirming post #35 from a second method, which matters more than confirming it from a second person. The published rates come from populations that were titrated on a…
Dizziness on standing and the electrolyte explanation — does this still hold? Replied, post #52 · Practice › Side effects · 3 Mar 2026 · 10 likes That matches what I have seen, for whatever a single anecdote is worth.
Second pass at: Adsorptive losses at low concentration, and why dilute solutions are… Replied, post #49 · Practice › Storage & stability · 25 Feb 2026 · 0 likes Published stability data applies specifically to the formulation studied, under the specific conditions stated. It does not automatically transfer to something…
Measurement error in a self-reported exposure Replied, post #33 · Evidence › Study critique · 23 Feb 2026 · 28 likes A criticism that would apply equally to every trial in the field is worth stating once and is not a reason to discount a particular paper.
Reading an interaction checker output critically Replied, post #120 · Practice › Interactions · 15 Feb 2026 · 1 like Anything that also slows gut motility compounds the same mechanism. That is a plausibility argument rather than a documented interaction, and it should be labelled as…
"Greater than or equal to 99%" as a specification rather than a result Replied, post #132 · Analytics › COA interpretation · 14 Feb 2026 · 3 likes The distinction between release testing and characterisation is one industrial documents make and retail ones usually do not. It is the difference between "we tested…
Specification in the result column: why that is a meaningful error Replied, post #122 · Analytics › COA interpretation · 14 Feb 2026 · 22 likes A chromatogram supplied as a small image is legible for peak shape and not for baseline detail. That is enough to sanity-check an integration and not enough to…
[2026 update] What a purity-only report leaves out Replied, post #24 · Sourcing › Independent verification · 13 Feb 2026 · 1 like The arithmetic on purity-only is the easy part and it is where the errors are, which is an uncomfortable combination. Show your working and someone will catch it.
Non-inferiority margins: how they are chosen and how they are abused — a second dataset Replied, post #27 · Evidence › Trials · 11 Feb 2026 · 19 likes Coming back to post #23, because the follow-up matters more than the original answer. The useful distinction on Non-inferiority margins is between what was measured and…
[2026 update] Confounding by indication, explained with a concrete example Replied, post #41 · Evidence › Study critique · 10 Feb 2026 · 0 likes Post #39 and I disagree about the size of the effect, not about the direction. Attrition is the failure mode most likely to invalidate a result and the least likely to…
Foaming during reconstitution and whether it matters — the long version Replied, post #9 · Practice › Reconstitution · 15 Jan 2026 · 20 likes Foaming during reconstitution has been discussed here with more heat than it deserves, mostly because two definitions have been in play the whole time.
Measurement error in home scales, with a worked standard deviation — the long version Replied, post #12 · Research Methods › Statistics · 13 Jan 2026 · 2 likes Marking my place. If it changes for me I will come back and say so.
Temperature loggers worth the money — the long version Replied, post #106 · Devices › Cold chain · 4 Jan 2026 · 13 likes Picking up post #103: that is the part I would want checked first. Regional stock shortens the exposure window more effectively than any packing improvement, which is…
Vomiting: when it is expected and when it is a reason to stop Replied, post #101 · Practice › Side effects · 29 Dec 2025 · 18 likes I had read the opposite somewhere and cannot now find where, which tells me something.
[2026 update] Availability by country, dated, with primary sources Replied, post #2 · Access › International · 15 Dec 2025 · 25 likes The opening post describes the usual case. This is about the unusual one. Import rules for personal use: what you can import for personal use depends on your country's…
Constipation management, with a dietitian's contribution Replied, post #8 · Practice › Side effects · 8 Dec 2025 · 0 likes I had written a reply contradicting post #6 and deleted it. Here is what survived. The published rates come from populations that were titrated on a defined schedule…
[2026 update] How much of the diluent volume the powder itself displaces Replied, post #51 · Practice › Reconstitution · 25 Nov 2025 · 8 likes Taking post #48 at face value and following it one step further. Working out the concentration after the fact from the volume you added is fine. Working it out from the…
Pen dose counters: what a click does and does not guarantee Replied, post #101 · Devices › Pens & autoinjectors · 19 Nov 2025 · 0 likes Comparing cost per milligram between a pen and a vial ignores wastage, dead volume and the number of doses actually obtainable. Cost per delivered dose at your dose is…
Older adults, sarcopenia risk, and the trade-off nobody quantifies — the long version Replied, post #49 · Clinical › Special populations · 10 Nov 2025 · 33 likes Agreed, and I will stop repeating the version of this I had been repeating.
Coming back to: Over-dilution: when your dose falls below one readable graduation Replied, post #77 · Practice › Reconstitution · 4 Nov 2025 · 17 likes On a U-100 insulin syringe, one hundred units is one millilitre and one unit is 0.01 millilitres. Units are volume marks. They mean nothing until you know the…
The anatomy of a question that gets answered within an hour — the long version Replied, post #45 · Start Here › How to Ask · 31 Oct 2025 · 17 likes Coming back to post #44, because the follow-up matters more than the original answer. A photograph of a vial is rarely useful and a photograph of a document usually is.…
Comparing my trajectory with the trial curves, carefully Replied, post #69 · Outcomes › Progress reports · 31 Oct 2025 · 29 likes Seasonal patterns: some people report weight loss is slower in winter than summer. Body composition and activity changes might contribute. Noting the season is useful…
Sleep tracking data and its considerable limitations Replied, post #114 · Wellbeing › Sleep · 28 Oct 2025 · 0 likes Nothing here is medical advice, and suspected sleep-disordered breathing specifically is something to have assessed properly rather than tracked.
The most useful thing you learned here that was not the answer you came for — a second… Replied, post #56 · Lounge › Off topic · 25 Sep 2025 · 25 likes Lounge-level thought to close on: the measure of this place is that being wrong in public here is cheap. That is a design decision and it took work. Reading it back,…
Pinch or no pinch, and how needle length changes the answer Replied, post #41 · Practice › Administration · 31 Aug 2025 · 25 likes Needle length matters less than angle for subcutaneous delivery in most people. A short needle at ninety degrees and a longer one at forty-five put the material in…
A ten-fold dose error caught before injection Replied, post #87 · Devices › Syringes & needles · 23 Aug 2025 · 4 likes A detachable luer needle plus hub can retain enough volume to matter. Whether it matters to you depends on your dose, and the arithmetic is worth doing once. Same…
A ten-fold dose error caught before injection — one year on Replied, post #19 · Devices › Syringes & needles · 1 Aug 2025 · 1 like A detachable luer needle plus hub can retain enough volume to matter. Whether it matters to you depends on your dose, and the arithmetic is worth doing once. Nothing…
How to research a compound with no human data without deceiving yourself Replied, post #4 · Compounds › Other compounds · 29 Jul 2025 · 10 likes Everything in the opening post holds. The case it does not cover is the one I have. Thymosin alpha-1 has a regulatory history in several jurisdictions and a real…
The CagriSema phase 2 paper and what a fixed combination buys Replied, post #66 · Compounds › Cagrilintide & amylin analogues · 8 Jul 2025 · 6 likes Combination products complicate the certificate question considerably. Two active components mean two purity determinations and a ratio, and a single figure for a…
Repeatability versus intermediate precision Replied, post #68 · Analytics › Method validation · 26 Jun 2025 · 13 likes Where a pharmacopoeial monograph exists, a method that follows it inherits a great deal of assurance. Almost nothing discussed here has one.
What this community means by "a source", in practical terms Replied, post #8 · Start Here › Welcome · 17 Jun 2025 · 25 likes The Lounge is a real category rather than a dumping ground. The sourcing rule still applies there, which surprises people, but the register is looser and nobody minds a…
Revisiting: German, French and Dutch differences, compared Replied, post #32 · Regional › European Union · 12 Jun 2025 · 1 like The reason German keeps being re-asked is that the answer is conditional and people quote it without the condition. It is not that the answer is unknown.
Pregnancy as an absolute contraindication Replied, post #59 · Safety › Contraindications · 19 May 2025 · 0 likes Post #56 answers the question as asked. The question underneath it is different. Medullary thyroid carcinoma (personal or family history) or multiple endocrine…
Second pass at: A history of disordered eating: proceeding carefully Replied, post #40 · Wellbeing › Mental health · 26 Apr 2025 · 8 likes Nothing here is medical advice and several members in this subcategory say plainly that they are describing their own experience only. The short answer was in the first…
Coming back to: Bariatric surgery history: altered anatomy, altered expectations Replied, post #3 · Clinical › Special populations · 20 Apr 2025 · 1 like Where I part company with the opening post, and it is a narrow parting. Pancreatitis history: the compounds can rarely trigger pancreatitis. A history of pancreatitis…
Second pass at: How to research a compound with no human data without deceiving yourself Replied, post #37 · Compounds › Other compounds · 31 Mar 2025 · 1 like Two things can be true about research a compound at once: the mechanism is plausible and the evidence for the size of the effect is thin. Most of the argument here is…
Consistent declarations and why they matter more than clever ones Replied, post #28 · Sourcing › Logistics · 13 Feb 2025 · 27 likes Consistent declarations is worth one more sentence than it usually gets, and the sentence is the one about how the number was arrived at.
Revisiting: Semaglutide formulation: what is in the licensed product besides the peptide Replied, post #78 · Compounds › Semaglutide · 3 Jan 2025 · 0 likes Reading back through, this was answered upthread and I missed it. My fault.
Oral semaglutide bioavailability and its variability between people — a second dataset Replied, post #68 · Compounds › Oral incretins · 27 Dec 2024 · 0 likes The gastrointestinal tolerability profile of the oral formulation is broadly similar in character to the injectable, which supports the effects being systemic rather…
Domestic fridge temperature mapping: a cheap experiment — what changed since Replied, post #26 · Devices › Cold chain · 24 Dec 2024 · 0 likes Freeze-thaw: some peptides tolerate freezing; others do not. Check your compound's labelling. Generally, repeated freeze-thaw is worse than single freeze-thaw.
Coming back to: When to suspect the method rather than the sample Replied, post #71 · Analytics › Method validation · 14 Dec 2024 · 0 likes Picking up post #68: that is the part I would want checked first. Specificity: the method can distinguish the intended compound from related impurities and degradation…
Oxidation and deamidation mass shifts, tabulated Replied, post #17 · Analytics › Mass spectrometry · 9 Dec 2024 · 6 likes Mass accuracy is expressed in parts per million. It is the difference between observed and theoretical mass divided by theoretical mass, multiplied by a million. A…
[2026 update] How to read a forest plot, properly, from scratch Replied, post #22 · Evidence › Trials · 8 Dec 2024 · 4 likes Absolute and relative effects answer different questions. Write down the event rate in each arm and the difference between them; everything quotable is derived from…
Second pass at: Sodium, potassium and magnesium when intake drops Replied, post #81 · Nutrition & Training › Hydration & electrolytes · 7 Sep 2024 · 32 likes Coming back to post #79, because the follow-up matters more than the original answer. The very ordinary causes of week-two malaise: inadequate hydration, low sodium…
The C-cell question: rodent findings and their human context — what changed since Replied, post #24 · Compounds › Semaglutide · 27 Aug 2024 · 0 likes The documentation on c-cell question is better than this thread and I say that as someone who has posted in the thread.
Circumference measurements as a poor man's composition estimate Replied, post #70 · Outcomes › Body composition · 15 Aug 2024 · 0 likes Neither method is capable of detecting the month-to-month changes that people report detecting month to month.