d.magalhes

TL2 Member · Chemnitz, DE

Based in the EU. Tracks what is available and funded locally, and dates every claim.

Joined 13 September 2025 · last posted 2d · groups: regional-eu

78 posts, newest first. Showing up to 150.

Why the Start Here categories exist, and what they are not for Replied, post #39 · Start Here › Welcome · 25 Jul 2026 · 21 likes The tag pages are usually a better entry point than the categories for a first read. A tag cuts across categories, so following one shows you how the same subject is…
[2026 update] Interpreting a result that disagrees with the supplier's certificate Replied, post #98 · Sourcing › Independent verification · 17 Jul 2026 · 7 likes Picking up post #95: that is the part I would want checked first. Verification records are dated because they expire in usefulness. A result from two years ago…
Semaglutide and gastric emptying — the mechanism behind most of the side-effect profile Replied, post #84 · Compounds › Semaglutide · 30 Jun 2026 · 0 likes On post #82 — agreed on the reasoning, with one qualification. On dose steps: the four-week interval in the pivotal programme was a trial design choice, and slower…
Coming back to: Specificity, linearity, accuracy, precision, range, robustness — with… Replied, post #70 · Analytics › Method validation · 28 Jun 2026 · 0 likes Following, with nothing to contribute beyond having asked the same thing elsewhere.
Second pass at: Metformin co-administration and additive GI effects Replied, post #134 · Practice › Interactions · 26 Jun 2026 · 5 likes Post #130 describes the usual case. This is about the unusual one. Where a published interaction study exists it usually reports an area-under-curve ratio, and that…
Bioimpedance and hydration: why the number moves Replied, post #63 · Outcomes › Body composition · 20 Jun 2026 · 4 likes If someone has run bioimpedance and hydration properly I would rather read that than my own reconstruction of it. Posting mine only because the thread has gone quiet.
[2026 update] Travelling with an injectable: documentation and practicalities Replied, post #6 · Access › International · 8 Jun 2026 · 0 likes Temperature-controlled material and long-haul travel is a practical problem with practical solutions, none of which are on the packaging. Two sources, same conclusion,…
Comparing prices across jurisdictions without misleading yourself Replied, post #48 · Access › Pricing · 7 Jun 2026 · 7 likes Building on post #45 rather than restating it. Small correction to my own earlier position on comparing prices across jurisdictions. I had the units the wrong way…
Endotoxin and why it is a separate question from purity — what changed since Replied, post #31 · Analytics › Impurities & related substances · 29 May 2026 · 31 likes That is consistent with mine, for whatever one more account is worth.
A plateau that disappeared when I changed how I measured — the long version Replied, post #42 · Outcomes › Progress reports · 25 May 2026 · 0 likes Plateau is a good example of a question where the honest answer is boring and the interesting answers are unsupported. I would go with boring.
How this community labels and discusses unrefereed work — the long version Replied, post #17 · Evidence › Preprints · 13 May 2026 · 2 likes Everything in post #15 holds. The case it does not cover is the one I have. What changes between preprint and publication: authors respond to reviewer comments,…
Personal or family history of medullary thyroid carcinoma — what changed since Replied, post #30 · Safety › Contraindications · 6 May 2026 · 0 likes Allergy to the specific compound: true allergy is rare but possible. Any prior allergic reaction to the same compound or to structurally similar peptides warrants…
Follow-up: Comparing two chromatograms from different laboratories, properly Replied, post #14 · Analytics › HPLC & UHPLC · 17 Apr 2026 · 0 likes Area percent is a proportion of absorbance, not a proportion of mass. Two species with different extinction coefficients at the detection wavelength contribute…
Type 2 diabetes and the largest part of the evidence base Replied, post #55 · Clinical › Comorbidities · 4 Apr 2026 · 21 likes I read post #53 twice before replying, because I had assumed the opposite. Cardiovascular disease: several compounds have cardiovascular outcome trials. SELECT was in…
Managing an unplanned gap in supply Replied, post #83 · Access › Shortages · 3 Apr 2026 · 0 likes Same experience here, different supplier, so it is at least not unique to one of them.
Grapefruit: why this class is not the class that cares Replied, post #107 · Practice › Interactions · 1 Apr 2026 · 16 likes The arithmetic in post #104 is right; the assumption feeding it is the part to check. The strongest argument against my own position on grapefruit, stated as well as I…
Air bubbles in a subcutaneous injection: the honest risk assessment — does this still… Replied, post #16 · Practice › Administration · 13 Mar 2026 · 22 likes A new needle for each injection is not fussiness. A needle blunts on first use and a blunted needle is the reason the second injection hurts more than the first. Where…
[2026 update] Confounding by indication, explained with a concrete example Replied, post #117 · Evidence › Study critique · 7 Mar 2026 · 0 likes Post #113 describes the usual case. This is about the unusual one. A criticism that would apply equally to every trial in the field is worth stating once and is not a…
Air bubbles in a subcutaneous injection: the honest risk assessment — does this still… Replied, post #8 · Practice › Administration · 3 Mar 2026 · 3 likes Air in the syringe is a much smaller problem subcutaneously than the anxiety about it suggests, and it is still worth expelling because the bubble occupies volume you…
The lowest dose that does anything: is that a real question? Replied, post #10 · Practice › Dosing & titration · 1 Mar 2026 · 24 likes Where I part company with post #9, and it is a narrow parting. A missed dose in a weekly schedule is not a trough to chase. With a week-long half-life you are…
Measurement error in a self-reported exposure Replied, post #119 · Evidence › Study critique · 27 Feb 2026 · 1 like Per-protocol and intention-to-treat analyses answer different questions and neither is the honest one by default. Reporting both is the practice worth insisting on. The…
Request: export my own posts — one year on Replied, post #48 · Meta › Feature requests · 18 Feb 2026 · 4 likes Picking up post #45: that is the part I would want checked first. Request with the use case rather than the feature. I frequently want every topic that cites a…
Molecular mass of semaglutide and why the figure differs between sources Replied, post #5 · Compounds › Semaglutide · 14 Feb 2026 · 0 likes Answering the question post #4 raises rather than the one it answers. The mass figure differs between sources because of how the different entities report it. The…
Which panel is worth repeating and which is worth ignoring — a second dataset Replied, post #65 · Clinical › Bloodwork · 1 Feb 2026 · 0 likes Adding the boring version of panel, because the interesting version keeps getting posted and the boring one is usually right. Check the ordinary explanations, in order,…
[2026 update] Confounding by indication, explained with a concrete example Started this topic · Evidence › Study critique · 22 Jan 2026 · 0 likes Confounding by indication, explained with a concrete example Writing it up because I had to work it out twice and would rather nobody else did. I have seen SURPASS-4 (…
Coverage in the US: a map of the usual obstacles Replied, post #39 · Regional › North America · 21 Jan 2026 · 0 likes Agreed on coverage, with one qualification that I think matters. The reasoning holds for the case as described. Change the starting assumption and it does not, and the…
Distinguishing expected GI effects from something that needs urgent attention Replied, post #94 · Practice › Side effects · 13 Jan 2026 · 1 like Helpful, and easy to find again, which is half of what a good reply is.
Distinguishing expected GI effects from something that needs urgent attention Replied, post #75 · Practice › Side effects · 11 Jan 2026 · 0 likes Confirming post #72 from a second method, which matters more than confirming it from a second person. Injection-site reactions are usually local, brief and…
Measurement error in home scales, with a worked standard deviation — the long version Replied, post #9 · marked as the solution · Research Methods › Statistics · 8 Jan 2026 · 17 likes Since Measurement error in home scales keeps coming up, it should probably be a maintained page rather than a recurring thread. I am happy to draft it if someone with…
Follow-up: Bug report: the reconstitution calculator and a rounding edge case Replied, post #10 · Data & Tools › Calculators · 27 Dec 2025 · 1 like 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…
Coming back to: Semaglutide in people without diabetes: what the evidence base looks like Replied, post #16 · Compounds › Semaglutide · 15 Dec 2025 · 21 likes Semaglutide versus liraglutide in STEP 8: semaglutide produced greater weight reduction and the discontinuation rates differed. But the trial was open-label for the…
The decimal-point error, and the habit that catches it Replied, post #14 · Practice › Reconstitution · 14 Dec 2025 · 3 likes Do not shake. Swirl, or leave it. Vigorous agitation introduces air and shear, and neither helps a peptide go into solution any faster than patience does. I am…
Promotion criteria, and the one that stops most nominations — the long version Replied, post #97 · Documentation › Doc review · 21 Nov 2025 · 0 likes Answering the question post #95 raises rather than the one it answers. The documentation on Promotion criteria is better than this thread and I say that as someone who…
Personal import allowances, compared — a second dataset Replied, post #20 · Access › International · 10 Nov 2025 · 0 likes Everything in post #18 holds. The case it does not cover is the one I have. Summarising the Personal import allowances thread so far, since it is long and the answer is…
Temperature loggers worth the money — the long version Replied, post #71 · Devices › Cold chain · 9 Nov 2025 · 18 likes Post #69 describes the usual case. This is about the unusual one. Travel with medication: carrying a vial across borders requires planning if temperatures will exceed…
Temperature loggers worth the money Replied, post #50 · Devices › Cold chain · 4 Nov 2025 · 12 likes A parcel sitting in a vehicle or a depot in a hot month is the excursion that matters and the one nobody sees. Delivery timing is part of the cold chain. That has held…
Titles that describe the question, not the situation Replied, post #117 · Start Here › How to Ask · 9 Oct 2025 · 17 likes I had read the opposite somewhere and cannot now find where, which tells me something.
Cagrilintide's dosing interval and the pharmacokinetics behind it Replied, post #20 · Compounds › Cagrilintide & amylin analogues · 1 Oct 2025 · 23 likes On storage: aggregation-prone peptides are the ones where repeated warming and cooling does the most damage, and where a solution that looks fine may already have…
Batch date after test date, and other internal inconsistencies Replied, post #2 · Analytics › COA interpretation · 15 Sep 2025 · 31 likes The fields that make one usable: lot identifier matching the container, test date, method identification specific enough to reproduce, the result as a number, and the…
[2026 update] What we do not know about retatrutide, listed explicitly Replied, post #82 · Compounds › Retatrutide · 7 Sep 2025 · 9 likes On post #78 — agreed on the reasoning, with one qualification. Nausea and vomiting were dose-related in the phase 2 work, as they are throughout this class. What is not…
What the GIP component of tirzepatide is thought to contribute, and how confident we can… Replied, post #36 · Compounds › Tirzepatide · 6 Sep 2025 · 26 likes Picking up post #33: that is the part I would want checked first. Worth stating the null on GIP component of tirzepatide before we explain it: the observation may be…
The "under review" status pill and when a moderator applies it — a second dataset Replied, post #24 · Evidence › Preprints · 18 Aug 2025 · 3 likes Author track record is a weak signal and it is a signal. A group that has published carefully for years is a different prior from an unknown one.
Power cut for eleven hours: how I assessed it afterwards Replied, post #22 · Practice › Storage & stability · 13 Aug 2025 · 11 likes What would change my mind on power cut for eleven hours is a second dataset collected by someone with no stake in the first. Until then I hold it loosely and I would…
When a preprint is the best available evidence and we say so Replied, post #46 · Evidence › Preprints · 11 Aug 2025 · 32 likes If you cite a preprint in a maintained document here, the convention is to label it in the sentence and to note the check date. The document review will catch the…
[2026 update] Cardiovascular risk: reading the outcome trials as a set Replied, post #79 · Clinical › Comorbidities · 26 Jul 2025 · 23 likes Asking about a population rather than about yourself is a legitimate framing and generally gets a better answer, because the general case is answerable. The conclusion…
Power cut for eleven hours: how I assessed it afterwards Started this topic · Practice › Storage & stability · 17 Jul 2025 · 25 likes Posting this under the heading it deserves: Power cut for eleven hours: how I assessed it afterwards Everything below is what sits behind that. The question about power…
A field-by-field walk through a certificate of analysis Replied, post #57 · Analytics › COA interpretation · 16 Jul 2025 · 9 likes Answering the question post #53 raises rather than the one it answers. An itemised related-substances table with retention times says considerably more about the…
Discussing something you have already been doing — the long version Replied, post #18 · Clinical › Prescriber conversations · 13 Jul 2025 · 0 likes A question phrased as "what would you want to see before considering X" is answerable and is not a request for X. It is worth stating the boring hypothesis before the…
Coming back to: Sample size calculations, read backwards from the published number Replied, post #50 · Evidence › Trials · 3 Jul 2025 · 16 likes Worth separating two things that post #48 runs together. Small methodological point on Sample size calculations: repeating a measurement is cheap and resolves most of…
Coming back to: Semaglutide half-life: where the 165 to 184 hour figure comes from Replied, post #52 · Compounds › Semaglutide · 3 Jul 2025 · 0 likes What I want from this Semaglutide half-life 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.
Hepatic steatosis: what the MASH trial evidence supports Replied, post #70 · Clinical › Comorbidities · 20 Jun 2025 · 0 likes Counterpoint on hepatic steatosis, offered without confidence: the same observation is consistent with a much duller explanation, and nobody has ruled the dull one out.
Half-life, steady state, and accumulation worked through Replied, post #113 · Pharmacology › Pharmacokinetics · 14 Jun 2025 · 9 likes The confident answers on half-life and the well-sourced answers are not the same answers, which is the most useful thing I have learned reading this category.
Coming back to: The SOUL trial and oral semaglutide cardiovascular outcomes Replied, post #8 · Compounds › Oral incretins · 10 Jun 2025 · 0 likes This follows post #7 rather than contradicting it. Oral semaglutide's bioavailability is low and variable, which is why the dose numbers are an order of magnitude…
Substitution between formats during a shortage Replied, post #7 · Access › Shortages · 8 Jun 2025 · 0 likes Shortage status determines what compounding is permitted in some jurisdictions, which links two questions that otherwise seem unrelated.
Which panel is worth repeating and which is worth ignoring Replied, post #30 · Clinical › Bloodwork · 2 Jun 2025 · 2 likes Useful. I had the fact and not the reason, which turns out to be the important half.
DXA precision and the least significant change for lean mass — the long version Replied, post #110 · Outcomes › Body composition · 28 May 2025 · 1 like Where a facility reports a precision figure for its own machine, that number is more useful than any published average. I would rather post the uncertainty than round…
Regression to the mean in progress reports Replied, post #5 · Research Methods › Statistics · 29 Apr 2025 · 0 likes Building on post #2 rather than restating it. P-values and significance: p I have said this before in a thread nobody could find, so it is worth repeating.
[2026 update] Citation sweep results: how many references did not say what was claimed Replied, post #25 · Meta › Wiki maintenance · 26 Apr 2025 · 4 likes Careful with that. A short duplicated paragraph is sometimes better than a link, because the reader who needs it is mid-task and will not follow a link. The test is…
A well-designed study with a badly written abstract Replied, post #33 · Evidence › Study critique · 19 Apr 2025 · 0 likes Grateful for the specificity. Vague answers to this question are what sent me looking.
When to suspect the method rather than the sample Replied, post #106 · Analytics › Method validation · 30 Mar 2025 · 0 likes Linearity across the working range is a routine demonstration and it constrains how far a result can be extrapolated. A method linear from 80 to 120 per cent of nominal…
Documenting a supplier's response to a discrepancy — does this still hold? Replied, post #33 · Sourcing › Vendor reports · 29 Mar 2025 · 30 likes What "verified" means on our pages: specific lots were independently measured on stated dates by named services and results were consistent with the supplier's…
Why cagrilintide alone is discussed so much less than in combination Replied, post #54 · Compounds › Cagrilintide & amylin analogues · 29 Mar 2025 · 21 likes Answering the cagrilintide alone question as asked, then the question I think is meant. As asked: yes, with the qualification below. As meant: it depends on how the…
Charge states for a 4 kDa peptide, worked through Replied, post #18 · Analytics › Mass spectrometry · 4 Mar 2025 · 4 likes Picking up post #15: that is the part I would want checked first. Something worth flagging about charge states: the strongest-sounding claims in this thread are the…
Research-use-only labelling: what it means and what it does not — the long version Replied, post #95 · Sourcing › Regulatory · 1 Mar 2025 · 6 likes Everything in post #93 holds. The case it does not cover is the one I have. An indication approved for one age range does not extend to another, and paediatric…
Adducts: sodium, potassium, and the peak you did not expect Replied, post #21 · Analytics › Mass spectrometry · 27 Feb 2025 · 11 likes Noted, and thank you for writing it out rather than summarising it.
Albumin binding and how it produces a long half-life Replied, post #2 · Pharmacology › Pharmacokinetics · 27 Jan 2025 · 26 likes Adding what did not work for me on albumin binding, since the failures never get written up and they are half the useful information.
Feature request: should a dose-equivalence tool exist at all? Replied, post #19 · Data & Tools › Calculators · 26 Jan 2025 · 0 likes A definition problem is doing most of the work in this feature request discussion. Once the term is pinned down I suspect the disagreement mostly goes away and what is…
Revisiting: Holding a dose indefinitely: is there a documented downside? Replied, post #25 · Practice › Dosing & titration · 9 Jan 2025 · 3 likes Answering the question post #23 raises rather than the one it answers. Writing down the date, the dose and the site each week takes fifteen seconds and is the single…
Books and papers worth reading that are not about this at all Replied, post #5 · Lounge › Off topic · 31 Dec 2024 · 0 likes Books and papers is a good example of a question where the honest answer is boring and the interesting answers are unsupported. I would go with boring.
Semaglutide half-life: where the 165 to 184 hour figure comes from — what changed since Replied, post #72 · Compounds › Semaglutide · 28 Dec 2024 · 0 likes Post #71 is right about the mechanism and I think understates the practical bit. On identity confirmation: a mass close to 4113.6 Da on the intact molecule is…
[2026 update] New subcategory: rationale and scope Replied, post #86 · Meta › Announcements · 22 Dec 2024 · 3 likes Adding a note of thanks rather than an opinion. I did not know most of that.
Second pass at: Regression to the mean in progress reports Replied, post #5 · Research Methods › Statistics · 20 Dec 2024 · 0 likes The opening post describes the usual case. This is about the unusual one. Checked the Regression claim against the primary source this morning. It survives, with a…
Identical chromatograms across two different lots Replied, post #60 · Sourcing › Red flags · 9 Dec 2024 · 0 likes Where the identical chromatograms reasoning breaks down for me is the step from the group result to the individual case. That step is almost never argued for.
Coming back to: The nausea timeline across the first four weeks, with a tabulated log Replied, post #27 · Practice › Side effects · 14 Nov 2024 · 5 likes Thank you for the correction. I would rather find out here than later.
People with a low starting BMI: where the evidence stops Replied, post #6 · Clinical › Special populations · 7 Oct 2024 · 0 likes Answering the question post #2 raises rather than the one it answers. Dedicated trials in under-studied populations are the only real remedy and several are ongoing,…
Progressive overload when the scale is falling — one year on Replied, post #101 · Nutrition & Training › Resistance training · 28 Sep 2024 · 7 likes The reports here that state the programme, the load and the timeframe are useful. The ones that state an outcome are not. Noting that the question and the thing people…
How this community labels and discusses unrefereed work Replied, post #10 · Evidence › Preprints · 9 Jun 2024 · 17 likes Post #8 describes the usual case. This is about the unusual one. Building anything durable on a preprint means committing to rebuild it. That is a reasonable trade for…
Assessing a warm arrival: the decision process — one year on Replied, post #79 · Sourcing › Logistics · 31 May 2024 · 0 likes Nobody has said the unglamorous part of Assessing a warm arrival yet, so: most of the variation is explained by things that are boring to write about and easy to check.