s.teixeira

TL2 Moderator · 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 Community norms: if you want to discuss how the community should work (not moderation decisions, which go in Meta) the Lounge is a place for that casual discussion.
Common supplements people ask about, assessed one at a time Replied, post #80 · Practice › Interactions · 22 Jul 2026 · 3 likes Worth separating two things that post #76 runs together. Insulin interaction: semaglutide and tirzepatide are not contraindicated with insulin but the combination…
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. Hepatic metabolism: the degree to which each compound is hepatically metabolised versus renally…
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 Secretagogues and glucose tolerance: there is a mechanistic concern that sustained growth hormone elevation might impair glucose tolerance. The clinical relevance of…
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. Structured report…
Reused chromatograms across lots: how to spot it Replied, post #54 · Analytics › COA interpretation · 2 Jul 2026 · 6 likes A certificate of analysis is a statement by its issuer that a defined test was performed on a defined lot and produced a defined result. That is all it is, and it is…
Coming back to: Swirling versus inverting versus leaving it alone Replied, post #25 · Practice › Reconstitution · 2 Jul 2026 · 6 likes A 10 mg vial reconstituted three different ways: 1 mL diluent gives 10 mg/mL, 2 mL gives 5 mg/mL, 4 mL gives roughly 2.5 mg/mL. The arithmetic is the same; the…
Private prescribing in the UK: what is actually involved Replied, post #45 · Regional › UK & Ireland · 22 Jun 2026 · 32 likes Supply and shortage resilience: both UK and Ireland sourced primarily from European suppliers until recent disruptions. Domestic availability and pricing changed.
[2026 update] Travelling with an injectable: documentation and practicalities Replied, post #26 · Access › International · 20 Jun 2026 · 27 likes post #25 answers the question as asked. The question underneath it is different. Insurance and coverage: coverage decisions are national. A compound approved in one…
Second pass at: Leak-back after withdrawal and whether you lost a meaningful dose Replied, post #20 · Practice › Administration · 17 Jun 2026 · 0 likes Coming back to post #18, because the follow-up matters more than the original answer. Leak-back after withdrawal: a small amount of liquid on the skin after withdrawal…
Primary endpoint hierarchies and why order matters — one year on Replied, post #10 · Evidence › Trials · 8 Jun 2026 · 18 likes I read post #8 twice before replying, because I had assumed the opposite. Practical note that does not fit anywhere else. Whatever you conclude from this topic, write…
Tracking intake honestly when appetite is absent Replied, post #46 · Nutrition & Training › Protein & intake · 3 Jun 2026 · 5 likes Timing of protein: spreading protein intake across the day, with some at each meal, is more practical than trying to hit the whole target at one sitting on suppressed…
Journal club: orforglipron phase 2 and the non-peptide question Replied, post #79 · Evidence › Journal club · 1 Jun 2026 · 4 likes SELECT (N Engl J Med 2023): Semaglutide cardiovascular outcomes without diabetes. The first outcome trial in people without diabetes, which decoupled the cardiovascular…
Peak-to-trough ratio at steady state for a weekly agent Replied, post #17 · Pharmacology › Pharmacokinetics · 31 May 2026 · 9 likes SNAC (the oral bioavailability enhancer): sodium N-(8-[2-hydroxybenzoyl]amino) caprylate transiently raises gastric pH and promotes absorption. Without it, oral…
Molecular mass of semaglutide and why the figure differs between sources Replied, post #67 · Compounds › Semaglutide · 30 May 2026 · 0 likes Worth separating two things that post #63 runs together. On alcohol: the labelling does not contraindicate it, but it raises gastric irritation risk and semaglutide…
[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 Picking up post #75: that is the part I would want checked first. Foaming during reconstitution: bubbles in the solution are usually just air incorporated during…
Review: a draft on reconstitution arithmetic, with objections — one year on Replied, post #18 · Documentation › Doc review · 27 May 2026 · 7 likes New maintainer recruitment: if a page's maintainer is inactive and updates are needed, suggesting a new maintainer here can help transition responsibility.
Second pass at: Absence of evidence and evidence of absence Replied, post #7 · Research Methods › Statistics · 22 May 2026 · 0 likes Thank you for the correction. I have edited my earlier post with a note rather than silently, so the thread still makes sense to read. The error was mine and it was the…
How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ — does this still hold? Replied, post #16 · Sourcing › Independent verification · 20 May 2026 · 12 likes post #15 answers the question as asked. The question underneath it is different. VendorInvestigate: documentation and supplier-practice review. Reviews paperwork rather…
A checklist for reading a certificate in under two minutes Replied, post #17 · Analytics › COA interpretation · 8 May 2026 · 31 likes post #16 is right about the mechanism and I think understates the practical bit. Amino acid analysis gives content: it hydrolyses the peptide and quantifies the…
Coming back to: Specificity, linearity, accuracy, precision, range, robustness — with… Replied, post #13 · Analytics › Method validation · 5 May 2026 · 6 likes Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing. The correction was fair and I had…
[2026 update] Charge states for a 4 kDa peptide, worked through Replied, post #46 · Analytics › Mass spectrometry · 1 Apr 2026 · 18 likes Coming back to post #44, because the follow-up matters more than the original answer. Practical note that does not fit anywhere else. Whatever you conclude from this…
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 Picking up post #73: that is the part I would want checked first. Importing for personal use: importing a prescription-only medicine without a prescription is not…
Constipation management, with a dietitian's contribution Replied, post #36 · Practice › Side effects · 3 Mar 2026 · 0 likes post #35 answers the question as asked. The question underneath it is different. Gallbladder complications: rapid weight loss increases the risk of gallstone formation.…
Dizziness on standing and the electrolyte explanation — does this still hold? Replied, post #52 · Practice › Side effects · 3 Mar 2026 · 10 likes I read post #50 twice before replying, because I had assumed the opposite. Having read the exchange above, I think I was wrong earlier in this topic and I want to say…
Second pass at: Adsorptive losses at low concentration, and why dilute solutions are… Replied, post #49 · Practice › Storage & stability · 25 Feb 2026 · 0 likes Dating prepared solutions: write the date reconstitution on the vial in permanent marker. If you later need to know whether it has been sitting for weeks or days, the…
Measurement error in a self-reported exposure Replied, post #33 · Evidence › Study critique · 23 Feb 2026 · 28 likes Publication bias: a single published positive trial is weaker evidence than multiple published trials with consistent results. Asking whether there are unpublished…
Reading an interaction checker output critically Replied, post #120 · Practice › Interactions · 15 Feb 2026 · 1 like Anticoagulants: no direct interaction with the compounds in this class. Weight loss and body composition changes might affect the clearance or effect of warfarin if you…
"Greater than or equal to 99%" as a specification rather than a result Replied, post #132 · Analytics › COA interpretation · 14 Feb 2026 · 3 likes Endotoxin testing is separate: a certificate of purity says nothing about endotoxin. A chemically pure preparation can carry a clinically significant endotoxin load. If…
Specification in the result column: why that is a meaningful error Replied, post #122 · Analytics › COA interpretation · 14 Feb 2026 · 22 likes A certificate of analysis is a statement by its issuer that a defined test was performed on a defined lot and produced a defined result. That is all it is, and it is…
[2026 update] What a purity-only report leaves out Replied, post #24 · Sourcing › Independent verification · 13 Feb 2026 · 1 like Interpreting a result: a purity figure is one measurement on one vial on one day. Agreement across two services is much stronger. A single high number does not…
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 Worth separating two things that post #23 runs together. Confounding in observational data: a third variable can explain an apparent association. In a randomised trial,…
[2026 update] Confounding by indication, explained with a concrete example Replied, post #41 · Evidence › Study critique · 10 Feb 2026 · 0 likes I read post #39 twice before replying, because I had assumed the opposite. Bias towards the null and bias away from the null: different criticisms have different…
Foaming during reconstitution and whether it matters — the long version Replied, post #9 · Practice › Reconstitution · 15 Jan 2026 · 20 likes Reconstituting a multi-strength kit: if a kit contains 5 mg, 10 mg, 15 mg vials and you are reconstituting all of them, writing the concentration on each vial in…
Measurement error in home scales, with a worked standard deviation — the long version Replied, post #12 · Research Methods › Statistics · 13 Jan 2026 · 2 likes post #11 answers the question as asked. The question underneath it is different. Number needed to treat: how many people need to be treated to prevent one bad outcome…
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. Travel with medication: carrying a vial across borders requires planning if temperatures will exceed…
Vomiting: when it is expected and when it is a reason to stop Replied, post #101 · Practice › Side effects · 29 Dec 2025 · 18 likes Worth separating two things that post #97 runs together. Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down what you did…
[2026 update] Availability by country, dated, with primary sources Replied, post #2 · Access › International · 15 Dec 2025 · 25 likes I read the opening post twice before replying, because I had assumed the opposite. Customs and import outcomes: different routes have different seizure rates. Some…
Constipation management, with a dietitian's contribution Replied, post #8 · Practice › Side effects · 8 Dec 2025 · 0 likes Coming back to post #6, because the follow-up matters more than the original answer. Having read the exchange above, I think I was wrong earlier in this topic and I…
[2026 update] How much of the diluent volume the powder itself displaces Replied, post #51 · Practice › Reconstitution · 25 Nov 2025 · 8 likes Picking up post #48: that is the part I would want checked first. How much of the diluent volume the powder itself displaces: for a small peptide vial, the powder…
Pen dose counters: what a click does and does not guarantee Replied, post #101 · Devices › Pens & autoinjectors · 19 Nov 2025 · 0 likes Pen mechanics: most pens are dial-and-inject devices where you dial the dose on the pen and push the button to inject. Understanding your specific pen's mechanism…
Older adults, sarcopenia risk, and the trade-off nobody quantifies — the long version Replied, post #49 · Clinical › Special populations · 10 Nov 2025 · 33 likes On post #45 — agreed on the reasoning, with one qualification. Hepatic impairment: less is known about dosing in significant liver disease than in kidney disease.…
Coming back to: Over-dilution: when your dose falls below one readable graduation Replied, post #77 · Practice › Reconstitution · 4 Nov 2025 · 17 likes A 10 mg vial reconstituted three different ways: 1 mL diluent gives 10 mg/mL, 2 mL gives 5 mg/mL, 4 mL gives roughly 2.5 mg/mL. The arithmetic is the same; 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 I read post #43 twice before replying, because I had assumed the opposite. The specific question in the title is more useful than you might think. A title like "a…
Comparing my trajectory with the trial curves, carefully Replied, post #69 · Outcomes › Progress reports · 31 Oct 2025 · 29 likes Plateaus and resets: if weight loss stalls and then resumes, that is ordinary. It is not evidence that the medication stopped working. It is not evidence that it is…
Sleep tracking data and its considerable limitations Replied, post #114 · Wellbeing › Sleep · 28 Oct 2025 · 0 likes Thank you for the correction. I have edited my earlier post with a note rather than silently, so the thread still makes sense to read. The error was mine and it was the…
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 This follows post #53 rather than contradicting it. For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add…
Pinch or no pinch, and how needle length changes the answer Replied, post #41 · Practice › Administration · 31 Aug 2025 · 25 likes A genuinely late dose: the labelling generally says that if the next dose is more than a couple of days away, take it as soon as you notice. If the next dose is close,…
A ten-fold dose error caught before injection Replied, post #87 · Devices › Syringes & needles · 23 Aug 2025 · 4 likes Dead volume: residual liquid in the hub and needle after withdrawal. Typical residual is 0.01 to 0.02 mL for an insulin syringe with a fixed needle. Accounting for it…
A ten-fold dose error caught before injection — one year on Replied, post #19 · Devices › Syringes & needles · 1 Aug 2025 · 1 like Needle length: typical lengths for subcutaneous injection are 4-6 mm (short), 8 mm (standard), or 10-12 mm (longer). Longer needles are needed for deeper tissue or if…
How to research a compound with no human data without deceiving yourself Replied, post #4 · Compounds › Other compounds · 29 Jul 2025 · 10 likes On post #3 — agreed on the reasoning, with one qualification. Two things before anyone answers the substance. First, the context in the first post is clear and…
The CagriSema phase 2 paper and what a fixed combination buys Replied, post #66 · Compounds › Cagrilintide & amylin analogues · 8 Jul 2025 · 6 likes Is synergy the right word for the combination data? A phase 2 trial cannot establish whether effects are synergistic or additive. Synergy is a mechanistic claim that…
Repeatability versus intermediate precision Replied, post #68 · Analytics › Method validation · 26 Jun 2025 · 13 likes Why two laboratories may disagree: after validating the same method, they may still report different purity on the same sample due to integration differences, column…
What this community means by "a source", in practical terms Replied, post #8 · Start Here › Welcome · 17 Jun 2025 · 25 likes Trust levels accumulate over time and they give you access to small things like the ability to edit your own posts without a timestamp. They are not a status symbol and…
Revisiting: German, French and Dutch differences, compared Replied, post #32 · Regional › European Union · 12 Jun 2025 · 1 like Thank you for the correction. I have edited my earlier post with a note rather than silently, so the thread still makes sense to read. The error was mine and it was the…
Pregnancy as an absolute contraindication Replied, post #59 · Safety › Contraindications · 19 May 2025 · 0 likes This follows post #56 rather than contradicting it. Diabetic retinopathy complications: a signal for this was noted in SUSTAIN 6. Current evidence is mixed. The risk is…
Second pass at: A history of disordered eating: proceeding carefully Replied, post #40 · Wellbeing › Mental health · 26 Apr 2025 · 8 likes Body image and weight loss: large weight loss changes a person's relationship with their body in ways that can be psychologically complex. Some of that is positive;…
Coming back to: Bariatric surgery history: altered anatomy, altered expectations Replied, post #3 · Clinical › Special populations · 20 Apr 2025 · 1 like Coming back to the opening post, because the follow-up matters more than the original answer. Older adults: sarcopenia risk is higher, polypharmacy is common, and the…
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 Naming conventions for research peptides cause confusion because suppliers do not follow a standard. The same compound gets different names from different suppliers. If…
Consistent declarations and why they matter more than clever ones Replied, post #28 · Sourcing › Logistics · 13 Feb 2025 · 27 likes For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.
Revisiting: Semaglutide formulation: what is in the licensed product besides the peptide Replied, post #78 · Compounds › Semaglutide · 3 Jan 2025 · 0 likes The opalescent appearance in semaglutide solutions is occasionally noted and the mechanism is unclear. It does not appear to correlate with product failure in practice.…
Oral semaglutide bioavailability and its variability between people — a second dataset Replied, post #68 · Compounds › Oral incretins · 27 Dec 2024 · 0 likes Why administration conditions matter for oral semaglutide and not for injectables: the oral formulation depends on a transient pH effect in the stomach. Anything that…
Domestic fridge temperature mapping: a cheap experiment — what changed since Replied, post #26 · Devices › Cold chain · 24 Dec 2024 · 0 likes Thank you for the correction. I have edited my earlier post with a note rather than silently, so the thread still makes sense to read. The error was mine and it was the…
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. Precision and repeatability: within-run and between-run variability of the method. Acceptance…
Oxidation and deamidation mass shifts, tabulated Replied, post #17 · Analytics › Mass spectrometry · 9 Dec 2024 · 6 likes Resolution: "high resolution" commonly means
[2026 update] How to read a forest plot, properly, from scratch Replied, post #22 · Evidence › Trials · 8 Dec 2024 · 4 likes Population narrowness: most trials in this class enrolled fairly specific groups. Baseline body mass index ranges, exclusion of renal disease, exclusion of certain…
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. Orthostatic symptoms: dizziness on standing after lying down can indicate…
The C-cell question: rodent findings and their human context — what changed since Replied, post #24 · Compounds › Semaglutide · 27 Aug 2024 · 0 likes For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.
Circumference measurements as a poor man's composition estimate Replied, post #70 · Outcomes › Body composition · 15 Aug 2024 · 0 likes Comparison to published data: the trials reported mean fat and lean mass changes. Individual results vary around that mean. Being above or below average is not a sign…