j.teixeira

TL2 · Faro

Contributes reviews on supplier material. Based in Faro.

Joined 2 July 2025 · last posted 14d

70 posts, newest first. Showing up to 150.

Review: a draft on reconstitution arithmetic, with objections — what changed since Replied, post #42 · Documentation › Doc review · 14 Jul 2026 · 0 likes Post #38 and I disagree about the size of the effect, not about the direction. Review the scope as well as the content. A page attempting too much is the commonest…
Seven-day rolling means and why weekly readings mislead Replied, post #16 · Outcomes › Progress reports · 12 Jul 2026 · 0 likes Seven-day rolling sits at the boundary between what this community can usefully discuss and what it cannot, and I think it falls on the discussable side, narrowly.
Washout with a one-week half-life: the arithmetic — does this still hold? Replied, post #39 · Research Methods › N-of-1 designs · 11 Jul 2026 · 11 likes Helpful, and easy to find again, which is half of what a good reply is.
What to include when your question involves a chromatogram — one year on Replied, post #68 · Start Here › How to Ask · 8 Jul 2026 · 9 likes Noted, and thank you for writing it out rather than summarising it.
Journal club: semaglutide in MASH, and surrogate endpoints Replied, post #26 · Evidence › Journal club · 7 Jul 2026 · 0 likes Everything in post #24 holds. The case it does not cover is the one I have. Where the group cannot agree, record the disagreement rather than resolving it by seniority.…
Stability of BPC-157 in solution: what has been measured — one year on Replied, post #69 · Compounds › Repair & healing peptides · 9 Jun 2026 · 32 likes Picking up post #68: that is the part I would want checked first. What I would tell a new member reading about Stability of BPC-157 for the first time: the confident…
Reading a home test result without over-claiming Replied, post #55 · Analytics › Home & field testing · 26 May 2026 · 18 likes This is the sort of exchange that makes the archive worth searching.
A supplier who responds to a discrepancy with silence — what changed since Replied, post #50 · Sourcing › Red flags · 22 May 2026 · 24 likes Adding the measurement that post #48 says would settle it. The strongest single signal available cheaply is what happens when you ask a technical question. A…
Official shortage notices and what they authorise Replied, post #56 · Access › Shortages · 18 May 2026 · 31 likes Taking post #54 at face value and following it one step further. I have no financial interest in anything named in this thread and I want to say so before I comment on…
Does a peptide degrade silently, with no visual change? Replied, post #28 · Practice › Storage & stability · 16 May 2026 · 4 likes Reading rather than answering, but this is the post I would point somebody at.
[2026 update] Regional warehouse stock versus direct despatch Replied, post #66 · Sourcing › Logistics · 10 May 2026 · 4 likes Taking post #65 at face value and following it one step further. Regional warehouse stock versus direct sits at the boundary between what this community can usefully…
Revisiting: Primary endpoint hierarchies and why order matters Replied, post #3 · Evidence › Trials · 4 May 2026 · 3 likes Dropout is information: high dropout rates can indicate tolerability problems or lower efficacy than the summary suggests. Where the analysis handled dropouts matters.…
Managing an unplanned gap in supply Replied, post #100 · Access › Shortages · 17 Apr 2026 · 18 likes Worth separating two things that post #98 runs together. Anyone reporting availability should say the region and the date, because both determine whether the report is…
Personal or family history of medullary thyroid carcinoma — what changed since Replied, post #11 · Safety › Contraindications · 15 Apr 2026 · 7 likes Understood. Thank you for being specific about the limits of it.
The 2.5 mg starting dose is not a therapeutic dose — why that matters Replied, post #77 · Compounds › Tirzepatide · 10 Apr 2026 · 0 likes This follows post #76 rather than contradicting it. Dual agonism versus dose: how much of tirzepatide's effect is the GIP component and how much is simply achieving…
Prediction intervals and why they are more honest than confidence intervals Replied, post #19 · Evidence › Meta-analyses · 8 Apr 2026 · 1 like I read post #17 twice before replying, because I had assumed the opposite. Study quality and weighting: some meta-analyses weight all studies equally; others weight by…
Why this subcategory is stricter about sourcing than most Replied, post #15 · Compounds › Secretagogues & GH axis · 5 Apr 2026 · 0 likes Storage: these are lyophilised short peptides and are generally reasonably stable dry and considerably less so in solution. Reconstituting only what will be used within…
GLP-1 receptor distribution: central and peripheral Replied, post #25 · Pharmacology › Receptor biology · 2 Apr 2026 · 20 likes Post #23 answers the question as asked. The question underneath it is different. Species differences in receptor pharmacology are substantial in this family, which is…
Coming back to: Why I now write the concentration on the vial in marker Replied, post #2 · Practice › Reconstitution · 7 Mar 2026 · 25 likes This follows the opening post rather than contradicting it. Why "add 2 mL" is not an instruction: the powder in the vial takes up space. "Add 2 mL to a 10 mL vial" and…
Introducing myself: pharmacist, sceptic, reluctant participant — one year on Replied, post #3 · Lounge › Introductions · 6 Mar 2026 · 14 likes Hello and welcome. One practical suggestion: watch two subcategories rather than the whole site. The firehose is real and it puts people off in the first fortnight. If…
Revisiting: A page that has drifted out of date and needs a maintainer Replied, post #119 · Documentation › Wiki requests · 3 Mar 2026 · 2 likes Documents that are mostly a worked example age better than documents that are mostly a summary, because the arithmetic does not change. That has held every time I have…
Measurement error in a self-reported exposure Replied, post #122 · Evidence › Study critique · 27 Feb 2026 · 0 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…
Which panel is worth repeating and which is worth ignoring — a second dataset Replied, post #82 · Clinical › Bloodwork · 21 Feb 2026 · 4 likes Where a panel includes a calculated value, that value inherits the imprecision of everything it was calculated from and is usually reported without an interval. The…
Mass error in ppm: the arithmetic and the caveat Replied, post #26 · Analytics › Mass spectrometry · 12 Feb 2026 · 27 likes This follows post #25 rather than contradicting it. Where I have landed on mass error in ppm, having got it wrong once in public: the direction is clear, the magnitude…
Coming back to: Solubility limits and what a cloudy solution is telling you Replied, post #2 · Pharmacology › Formulation chemistry · 7 Feb 2026 · 4 likes Where I part company with the opening post, and it is a narrow parting. Overfill in a vial is deliberate and accounts for the volume unrecoverable at the end. It is not…
Managing an unplanned gap in supply Replied, post #10 · Access › Shortages · 20 Jan 2026 · 9 likes What I want from this managing an unplanned gap thread is the list of things that would need to be true for the claim to hold. If we can write that list, we can check it.
[2026 update] Does a peptide degrade silently, with no visual change? Replied, post #15 · Practice › Storage & stability · 20 Jan 2026 · 4 likes I had written a reply contradicting post #14 and deleted it. Here is what survived. Clarity is a weak test. A solution can lose a significant fraction of its active…
A partial dose because the pen emptied mid-injection Replied, post #42 · Practice › Administration · 8 Jan 2026 · 3 likes Adding the measurement that post #39 says would settle it. What I would tell a new member reading about partial dose because the pen for the first time: the confident…
Follow-up: Bug report: the reconstitution calculator and a rounding edge case Replied, post #14 · Data & Tools › Calculators · 2 Jan 2026 · 0 likes Significant figures in the output should not exceed what the inputs support. A concentration calculated from a nominal vial mass is not known to four decimal places.…
Stepping down deliberately, and how to do it without losing progress Replied, post #36 · Practice › Dosing & titration · 2 Jan 2026 · 21 likes This is the first time the answer has come with its own limits attached. Appreciated.
Aggregates and why a purity assay may miss them entirely Replied, post #24 · Analytics › Impurities & related substances · 23 Dec 2025 · 26 likes What I would check first on aggregates is whether the thing being measured moved or whether the way of measuring it moved. Those look identical in a graph.
MHRA statements, read directly Replied, post #53 · Regional › UK & Ireland · 21 Dec 2025 · 0 likes Picking up post #50: that is the part I would want checked first. Where a member reports a decision, the useful detail is the stated reason rather than the outcome,…
Tirzepatide's shorter half-life and its one practical consequence Replied, post #20 · Compounds › Tirzepatide · 3 Dec 2025 · 6 likes SURPASS-2 compared tirzepatide with semaglutide 1.0 mg, the licensed diabetes dose at that time. It did not compare with semaglutide 2.4 mg, the highest approved dose.…
Prescription requirements and telehealth models Replied, post #32 · Sourcing › Regulatory · 26 Nov 2025 · 11 likes Scheduling and prescription status are separate questions and the answer to one does not imply the other.
Realistic expectations for strength while losing weight quickly Replied, post #37 · Nutrition & Training › Resistance training · 18 Nov 2025 · 0 likes Offering a way to settle realistic expectations for strength rather than another opinion about it. Two measurements, taken the same way, a fortnight apart. If the…
[2026 update] What steady state means for the decision to escalate Replied, post #116 · Practice › Dosing & titration · 17 Nov 2025 · 25 likes The useful distinction on steady state is between what was measured and what was inferred from it. Both end up in the same sentence and only one of them has error bars.
Lurking for two months before posting: was that the right call? Replied, post #5 · Start Here › Welcome · 16 Nov 2025 · 7 likes You do not need to introduce yourself before asking a question, and nobody will think worse of you for arriving with one. The introductions subcategory exists for…
EMA product information as a primary source Replied, post #58 · Regional › European Union · 12 Nov 2025 · 16 likes Bookmarking this. I will come back when I have something worth adding.
Publishing an inconvenient result: a case study — the long version Replied, post #20 · Sourcing › Independent verification · 27 Oct 2025 · 12 likes What I would check first on Publishing an inconvenient result is whether the thing being measured moved or whether the way of measuring it moved. Those look identical…
Angle of injection and whether 90 degrees is always right Replied, post #40 · Practice › Administration · 24 Oct 2025 · 10 likes Taking post #37 at face value and following it one step further. Cold solution and stinging: warming the vial in your hands for a minute before injection reduces the…
Comparing tirzepatide and semaglutide is harder than the tables suggest Replied, post #3 · Compounds › Tirzepatide · 7 Oct 2025 · 0 likes SURPASS-2 compared tirzepatide with semaglutide 1.0 mg, the licensed diabetes dose at that time. It did not compare with semaglutide 2.4 mg, the highest approved dose.…
The nausea timeline across the first four weeks, with a tabulated log Replied, post #104 · Practice › Side effects · 29 Sep 2025 · 3 likes I read post #101 twice before replying, because I had assumed the opposite. Gallbladder complications: rapid weight loss increases the risk of gallstone formation. The…
Titles that describe the question, not the situation Replied, post #106 · Start Here › How to Ask · 26 Sep 2025 · 2 likes Answering the question post #104 raises rather than the one it answers. Practical note on titles: write down what you expect before you look. The number of times I have…
Semaglutide versus liraglutide head to head: reading STEP 8 carefully Replied, post #62 · Compounds › Semaglutide · 21 Sep 2025 · 12 likes STEP 1 and STEP 4 are two different questions. The first asks what happens when treatment is added; the second asks what happens when it is withdrawn after a run-in.…
"Should I double up?" — answered once, at length, calmly Replied, post #18 · Practice › Administration · 15 Sep 2025 · 0 likes If you have to inject at a different time of day than usual, that is a much smaller perturbation than it feels for a weekly compound with a week-long half-life.
Revisiting: Filter needles: when they help and what they cost you Replied, post #53 · Devices › Syringes & needles · 7 Sep 2025 · 9 likes Building on post #51 rather than restating it. Reframing Filter needles slightly, because I think the disagreement is about the question rather than the answer. If the…
Why semaglutide solutions can look faintly opalescent and when that matters Replied, post #12 · Compounds › Semaglutide · 1 Sep 2025 · 0 likes Counter-ion form matters for the arithmetic and is almost never stated. A vial labelled 5 mg of peptide as an acetate salt and one labelled 5 mg as trifluoroacetate do…
Power cut for eleven hours: how I assessed it afterwards Replied, post #19 · Practice › Storage & stability · 10 Aug 2025 · 1 like Post #18 and I disagree about the size of the effect, not about the direction. Second-hand on power cut for eleven hours, so weight it accordingly — someone whose…
Washout: how long is long enough, and for what purpose Replied, post #50 · Pharmacology › Pharmacokinetics · 29 Jul 2025 · 7 likes Adding the measurement that post #49 says would settle it. Small methodological point on washout: repeating a measurement is cheap and resolves most of what is being…
[2026 update] A single out-of-range value on an otherwise normal panel Replied, post #3 · Clinical › Bloodwork · 29 Jul 2025 · 30 likes General information rather than advice about anyone's care. A single value outside a reference interval, on a single draw, in an otherwise unremarkable panel, is…
Revisiting: Review: an evidence digest and the citation check that delayed it Replied, post #2 · Documentation › Doc review · 21 Jul 2025 · 14 likes Nothing to add on the substance. Thank you for taking the question at face value.
What a documentation review can and cannot tell you Replied, post #36 · Sourcing › Independent verification · 15 Jul 2025 · 1 like Counterpoint on documentation review, offered without confidence: the same observation is consistent with a much duller explanation, and nobody has ruled the dull one…
Domestic fridge temperature mapping: a cheap experiment — what changed since Replied, post #124 · Devices › Cold chain · 16 Jun 2025 · 23 likes Domestic fridge temperature mapping has a well-known answer and a correct answer, and the interesting work is establishing that they are the same. Nobody has done that…
A 5 mg vial and a 0.25 mg dose: the arithmetic in full — what changed since Replied, post #87 · Practice › Reconstitution · 8 Jun 2025 · 0 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…
[2026 update] An appeal that failed, and what I would do differently Replied, post #21 · Access › Insurance & coverage · 7 Jun 2025 · 27 likes Picking up post #18: that is the part I would want checked first. The bit of appeal that nobody enjoys is that the answer changes depending on what you are trying to…
Lean mass preservation: what the evidence supports Replied, post #3 · Outcomes › Body composition · 4 May 2025 · 3 likes Neither method is capable of detecting the month-to-month changes that people report detecting month to month. Not a strong opinion, just a consistent one.
A claim built entirely on a subgroup analysis Replied, post #14 · Evidence › Study critique · 2 May 2025 · 4 likes On claim built, the part that usually goes wrong is that the question is asked as though it has one answer. It has a range, and the width of the range is the…
Second pass at: Pen dose counters: what a click does and does not guarantee Replied, post #28 · Devices › Pens & autoinjectors · 28 Apr 2025 · 0 likes The arithmetic in post #26 is right; the assumption feeding it is the part to check. Travel with a pen raises a cold-chain question and a documentation question. The…
Cost per milligram, computed honestly across formats — the long version Replied, post #70 · Access › Pricing · 19 Apr 2025 · 18 likes Cost per milligram is the only comparison that survives format differences, and even then it needs care. Nothing above should be read as advice about what anyone else…
Follow-up: How much fluid is actually needed, and how you would know Replied, post #2 · Nutrition & Training › Hydration & electrolytes · 23 Mar 2025 · 2 likes The opening post describes the usual case. This is about the unusual one. Constipation and hydration: dehydration makes constipation worse. Increasing fluid intake is…
Albumin binding and how it produces a long half-life Replied, post #17 · Pharmacology › Pharmacokinetics · 23 Mar 2025 · 10 likes Terminal half-life estimated from a short sampling window underestimates the true value. That is a common source of discrepant figures between sources. The variance…
Counter-ion content and its effect on measured mass Started this topic · Analytics › Mass spectrometry · 13 Mar 2025 · 10 likes On the subject in the title: Counter-ion content and its effect on measured mass Working notes rather than a conclusion. Something about counter-ion content does not…
Validating a method you did not develop — does this still hold? Replied, post #11 · Analytics › Method validation · 15 Feb 2025 · 21 likes Accuracy: the method measures what you intend to measure. For purity methods, this is tested by spike-and-recover experiments: add a known amount of impurity to a…
Second pass at: What a reversed-phase purity number actually is Started this topic · Analytics › HPLC & UHPLC · 25 Jan 2025 · 53 likes On the subject in the title: Second pass at: What a reversed-phase purity number actually is Working notes rather than a conclusion. I would like to understand what…
Coming back to: Reading a meta-analysis you disagree with, fairly Replied, post #14 · Evidence › Meta-analyses · 4 Jan 2025 · 15 likes Worth separating two things that post #12 runs together. The number of included studies should be visible in any citation of a pooled figure. "A meta-analysis showed"…
Injection-site reactions: describing them precisely enough to be useful Replied, post #74 · Practice › Side effects · 15 Dec 2024 · 7 likes Coming back to post #70, because the follow-up matters more than the original answer. The published rates come from populations that were titrated on a defined schedule…
Athletes in weight-category sports: a different risk calculus — a second dataset Replied, post #15 · Clinical › Special populations · 12 Nov 2024 · 5 likes Genuine question rather than a rhetorical one: has anyone here actually observed Athletes in weight-category sports, as opposed to read about it? The thread is long and…
Anxiety in the first weeks: drug, situation, or both Replied, post #6 · Wellbeing › Mental health · 6 Oct 2024 · 0 likes Noted, and I have changed what I was going to do on the strength of it.
Splitting a vial for two laboratories: how to do it without ruining both — what changed… Replied, post #99 · Sourcing › Independent verification · 1 Oct 2024 · 0 likes How to submit a sample: contact the service directly. They will provide instructions on vial type, quantity, labelling, shipping. Following their instructions exactly…
A rising related-substance total over six months: degradation or method drift? Replied, post #17 · Analytics › Impurities & related substances · 29 Aug 2024 · 21 likes The honest reading of a purity figure: it is an upper bound on how much of what the method could see was the intended species, under one integration convention, on one…