c.delgado

TL2 · Genoa

Contributes reviews on supplier material. Based in Genoa.

Joined 4 October 2024 · last posted 3d

76 posts, newest first. Showing up to 150.

PIONEER 6 cardiovascular safety, read as a safety trial rather than an efficacy one Replied, post #26 · Compounds › Oral incretins · 25 Jul 2026 · 26 likes Offering a way to settle PIONEER 6 cardiovascular safety rather than another opinion about it. Two measurements, taken the same way, a fortnight apart. If the…
Common supplements people ask about, assessed one at a time Replied, post #92 · Practice › Interactions · 24 Jul 2026 · 3 likes I have no financial interest in anything named in this thread and I want to say so before I comment on common supplements, because it is the sort of subject where it…
Mass error in ppm: the arithmetic and the caveat — a second dataset Replied, post #24 · Analytics › Mass spectrometry · 24 Jul 2026 · 8 likes Deamidation adds approximately one dalton and produces a species that frequently elutes very close to the parent. It is the hardest common impurity to see…
Journal club: SUSTAIN 6 and its retinopathy signal Replied, post #97 · Evidence › Journal club · 21 Jul 2026 · 12 likes Where the group cannot agree, record the disagreement rather than resolving it by seniority. The recorded disagreement is more honest and more useful later. I would…
Seven-day rolling means and why weekly readings mislead Replied, post #74 · Outcomes › Progress reports · 21 Jul 2026 · 32 likes Worth stating the null on seven-day rolling before we explain it: the observation may be nothing. That possibility deserves a sentence and usually does not get one.
What consumer-accessible tests can and cannot determine — a second dataset Replied, post #61 · Analytics › Home & field testing · 7 Jul 2026 · 10 likes The confident answers on consumer-accessible tests and the well-sourced answers are not the same answers, which is the most useful thing I have learned reading this…
Semaglutide formulation: what is in the licensed product besides the peptide Replied, post #27 · Compounds › Semaglutide · 4 Jul 2026 · 0 likes On the injection-day question: the labelling for licensed semaglutide allows the day to be changed provided at least two days separate the two injections. That interval…
Reading a syringe in poor light, and how to avoid needing to — what changed since Replied, post #8 · Devices › Syringes & needles · 1 Jul 2026 · 7 likes On post #6 — agreed on the reasoning, with one qualification. Dead volume: residual liquid in the hub and needle after withdrawal. Typical residual is 0.01 to 0.02 mL…
Prescription requirements and telehealth models — a second dataset Replied, post #80 · Sourcing › Regulatory · 26 Jun 2026 · 0 likes Scheduling and prescription status are separate questions and the answer to one does not imply the other.
Publication patterns in the BPC-157 literature, examined Replied, post #9 · Compounds › Repair & healing peptides · 7 Jun 2026 · 6 likes The reason publication patterns is hard to answer is that the obvious measurement and the relevant quantity are not the same thing, and substituting one for the other…
[2026 update] Regional warehouse stock versus direct despatch Replied, post #91 · Sourcing › Logistics · 4 Jun 2026 · 3 likes The arithmetic in post #90 is right; the assumption feeding it is the part to check. One more thing on Regional warehouse stock versus direct that took me far too long…
The best-written scientific paper you have read Replied, post #69 · Lounge › Off topic · 28 May 2026 · 0 likes Newer drugs and mechanisms: when a new drug launches or a new mechanism is discovered, the Lounge is a place to discuss the news and speculate before hard data exists.
Revisiting: Journal club: SURMOUNT-1, read without the press release Replied, post #50 · Evidence › Journal club · 27 May 2026 · 0 likes The most common failure mode is spending fifty minutes on the effect size and ten on the population. Reversing that ratio would improve most sessions. I would want a…
Why a glucagon receptor agonist in a weight-loss compound is not a contradiction — one… Replied, post #7 · Compounds › Retatrutide · 26 May 2026 · 0 likes On identity confirmation more generally: for a compound with no widely available reference material, orthogonal confirmation matters more than usual. A mass result and…
[2026 update] Thyroid function tests during substantial weight change Replied, post #69 · Clinical › Bloodwork · 16 May 2026 · 14 likes On Thyroid function tests during substantial: the maintained page in the documentation commons covers the general case with citations and a review date, which is more…
Reflectance and photometric devices: precision in practice — a second dataset Replied, post #29 · Analytics › Home & field testing · 16 May 2026 · 9 likes Answering the question post #27 raises rather than the one it answers. Ultraviolet absorbance at 280 nanometres estimates concentration for peptides containing aromatic…
Why the absence of controlled human data on BPC-157 matters more than people admit Replied, post #22 · Compounds › Repair & healing peptides · 7 May 2026 · 1 like Right, and stated more narrowly than I would have dared to state it.
Forced degradation studies: designing one that is informative Replied, post #49 · Analytics › Method validation · 4 May 2026 · 0 likes That is clearer than the version I had in my head. Thank you.
Why the timeline is on the right and not the left — what changed since Replied, post #25 · Meta › Site feedback · 24 Apr 2026 · 0 likes Second this, and I would have said it less carefully.
Journal club: STEP 1 and the treatment-policy estimand — does this still hold? Replied, post #3 · Evidence › Journal club · 14 Apr 2026 · 18 likes Thank you for taking the time. That was more work than a reply usually is.
Prescription portability between countries Replied, post #6 · Access › International · 11 Apr 2026 · 20 likes The confident answers on prescription portability between countries and the well-sourced answers are not the same answers, which is the most useful thing I have learned…
Splitting an overlong document into two Replied, post #11 · Documentation › Wiki requests · 3 Apr 2026 · 0 likes Adding a null result on splitting an overlong document. I looked, carefully, and found nothing, and null results deserve posting precisely because they never are.
Mass error in ppm: the arithmetic and the caveat Replied, post #8 · Analytics › Mass spectrometry · 11 Feb 2026 · 14 likes This follows post #5 rather than contradicting it. Calibration matters: a high-resolution instrument out of calibration can report mass with ppm error large enough to…
[2026 update] A rising related-substance total over six months: degradation or method… Started this topic · Analytics › Impurities & related substances · 7 Feb 2026 · 11 likes The question in the title: A rising related-substance total over six months: degradation or method drift? I will give what I have already checked below so nobody…
The most common factual error about semaglutide on the internet — what changed since Replied, post #6 · Compounds › Semaglutide · 12 Jan 2026 · 3 likes Adding the measurement that post #4 says would settle it. The C-cell question: semaglutide triggered medullary thyroid carcinoma in rodent toxicology studies. A signal…
Follow-up: A supplier that answers analytical questions with restated claims Replied, post #39 · Sourcing › Red flags · 5 Jan 2026 · 0 likes A supplier changing batch nomenclature is not a warning sign, and it does make historical comparison harder until a mapping exists.
Reading an interaction checker output critically Replied, post #79 · Practice › Interactions · 30 Dec 2025 · 31 likes Good question, well framed, and I would like to see it answered properly.
Second pass at: Cagrilintide's dosing interval and the pharmacokinetics behind it Replied, post #7 · Compounds › Cagrilintide & amylin analogues · 29 Dec 2025 · 20 likes Cagrilintide alone is discussed less than in combination because the published data is almost entirely from combination trials. The phase 2 combination data was…
Guidelines revision: what changed and why — one year on Replied, post #42 · Meta › Announcements · 3 Dec 2025 · 16 likes Source for the Guidelines revision figure, since it was asked for. It is in the discussion rather than the abstract, which is why the version circulating is stronger…
Reading SURMOUNT-1 without the press release Replied, post #80 · Compounds › Tirzepatide · 27 Nov 2025 · 1 like Adding a small correction to the reading SURMOUNT-1 without the press summary above rather than a disagreement with it. The substance holds; one of the figures is out…
[2026 update] How much of the diluent volume the powder itself displaces Replied, post #79 · Practice › Reconstitution · 26 Nov 2025 · 0 likes Preservative effectiveness is tested against a defined microbial challenge under defined conditions. It is not a licence to treat an entered vial as sterile…
Pharmaceutical compounding rules, summarised from primary sources — a second dataset Replied, post #45 · Sourcing › Regulatory · 23 Nov 2025 · 17 likes That is the distinction I keep failing to hold on to. Written down now.
Coming back to: Injection-site reactions: describing them precisely enough to be useful Replied, post #7 · Practice › Side effects · 21 Nov 2025 · 7 likes The arithmetic in post #5 is right; the assumption feeding it is the part to check. Injection-site reactions are usually local, brief and unremarkable. A reaction…
How to read a phase 2 result without treating it as a phase 3 result — what changed since Replied, post #14 · Compounds › Retatrutide · 5 Nov 2025 · 0 likes Understood, and I withdraw the assumption I opened with.
When to stop reading forums, including this one Replied, post #39 · Wellbeing › Mental health · 21 Oct 2025 · 3 likes Post #36 answers the question as asked. The question underneath it is different. Support and community: some people process weight change through community (online or…
Second pass at: How to ask a question when you cannot say why you are asking it Replied, post #24 · Start Here › How to Ask · 18 Oct 2025 · 0 likes The arithmetic in post #23 is right; the assumption feeding it is the part to check. Disagreeing with an answer you got: cite what you disagree with, say what…
The anatomy of a question that gets answered within an hour — the long version Replied, post #2 · Start Here › How to Ask · 15 Oct 2025 · 12 likes Narrowing the opening post, because the general version has more than one answer. The specific question in the title is more useful than you might think. A title like…
Payment method and the leverage it gives you, ranked Replied, post #70 · Sourcing › Payments · 24 Sep 2025 · 10 likes Fraud and scams: if a supplier demands payment upfront with no recourse if delivery fails, you are taking a risk. Reputation and history of other buyers matter. A…
Can a home kit substitute for a laboratory report? A careful no Replied, post #13 · Analytics › Home & field testing · 17 Sep 2025 · 11 likes I read post #11 twice before replying, because I had assumed the opposite. Where home testing is genuinely valuable is as a screen before spending on independent…
Documenting an adverse event properly Replied, post #2 · Safety › Adverse events · 10 Sep 2025 · 1 like Reporting to regulatory agencies: if you have had a serious event, reporting it to the regulatory agency in your country can help with signal detection across the…
Aggregated purity results across four services, with caveats — a second dataset Replied, post #53 · Data & Tools › Datasets · 8 Sep 2025 · 4 likes Post #52 is the version of this I will quote in future. One addition. The bit of Aggregated purity results across four that nobody enjoys is that the answer changes…
Confounding by indication, explained with a concrete example Replied, post #5 · Evidence › Study critique · 30 Aug 2025 · 32 likes Confounding: in observational data, is there a third variable that explains the apparent association? In randomised data, randomisation should balance unknown…
Follow-up: Journal club: orforglipron phase 2 and the non-peptide question Replied, post #37 · Evidence › Journal club · 22 Aug 2025 · 2 likes Second this, and I would have said it less carefully.
Second pass at: Why this subcategory is stricter about sourcing than most Replied, post #29 · Compounds › Secretagogues & GH axis · 2 Aug 2025 · 0 likes Effects reported at the level of appetite are the most consistently described and the most mechanistically direct for the ghrelin-receptor compounds, which is not what…
The CagriSema phase 2 paper and what a fixed combination buys Replied, post #73 · Compounds › Cagrilintide & amylin analogues · 24 Jul 2025 · 2 likes The phase 3 combination programme is where the clinically interesting numbers will come from. Phase 2 established that the combination does something; the size of it in…
Tracking that stops updating and then resumes Replied, post #10 · Sourcing › Logistics · 15 Jul 2025 · 4 likes Peak periods and public holidays affect this more than any other factor and are entirely predictable in advance.
Journal club: SURMOUNT-4 and continuation versus withdrawal — a second dataset Replied, post #63 · Evidence › Journal club · 3 Jul 2025 · 15 likes That is a fair summary of where the discussion has got to.
Follow-up: Why the titration planner refuses to produce a schedule below a floor Replied, post #30 · Data & Tools › Calculators · 20 Jun 2025 · 12 likes The arithmetic in post #27 is right; the assumption feeding it is the part to check. Marking my uncertainty on titration planner refuses explicitly. I am confident…
Second pass at: Reading a combination trial: attributing effect to components Replied, post #27 · Compounds › Cagrilintide & amylin analogues · 12 Jun 2025 · 0 likes Everything in post #23 holds. The case it does not cover is the one I have. I would keep Reading a combination trial and the decision it usually gets used for separate…
Half-life, steady state, and accumulation worked through Replied, post #38 · Pharmacology › Pharmacokinetics · 29 May 2025 · 22 likes That is consistent with mine, for whatever one more account is worth.
Follow-up: The decimal-point error, and the habit that catches it Replied, post #5 · Practice › Reconstitution · 28 May 2025 · 28 likes Building on post #2 rather than restating it. The decimal-point error: computing 5 mg / 2 mL as 0.25 mg/mL instead of 2.5 mg/mL is the most common arithmetic error in…
Follow-up: Documentation that appears only after payment Replied, post #73 · Sourcing › Red flags · 13 May 2025 · 24 likes Post #71 and I disagree about the size of the effect, not about the direction. The useful distinction on Documentation is between what was measured and what was…
Cost per milligram, computed honestly across formats — the long version Replied, post #98 · Access › Pricing · 13 May 2025 · 2 likes Same experience here, different supplier, so it is at least not unique to one of them.
Carryover and the ghost peak from last week's standard Replied, post #87 · Analytics › HPLC & UHPLC · 12 Apr 2025 · 0 likes Trifluoroacetic acid at 0.1 per cent is the near-universal ion-pairing additive for this work, and it also raises the baseline at 214 nanometres. That is why the same…
Carryover and the ghost peak from last week's standard Replied, post #62 · Analytics › HPLC & UHPLC · 9 Apr 2025 · 0 likes Carryover has been discussed here with more heat than it deserves, mostly because two definitions have been in play the whole time.
Follow-up: What other technical communities get right that we do not Replied, post #53 · Lounge › Off topic · 30 Mar 2025 · 5 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.
Reconstituting a multi-strength kit without mixing yourself up Replied, post #50 · Practice › Reconstitution · 29 Mar 2025 · 9 likes Where I have landed on reconstituting a multi-strength kit, having got it wrong once in public: the direction is clear, the magnitude is not, and anyone quoting a…
What SELECT changed about how semaglutide is discussed, and what it did not Replied, post #45 · Compounds › Semaglutide · 19 Mar 2025 · 26 likes Appreciated. The plain phrasing does more work here than a longer post would.
Maintainer handover: how it works Replied, post #35 · Meta › Wiki maintenance · 15 Mar 2025 · 22 likes For anyone finding this later: the short answer on maintainer handover is that it depends on one thing, and the rest of the thread is people identifying which thing.
Checking someone else's arithmetic: a worked example thread Replied, post #25 · Practice › Reconstitution · 26 Feb 2025 · 5 likes Where I part company with post #21, and it is a narrow parting. Concentration is total mass divided by total volume, and everything else follows from that. Ten…
When to suspect the method rather than the sample Replied, post #86 · Analytics › Method validation · 22 Feb 2025 · 1 like Specificity: the method can distinguish the intended compound from related impurities and degradation products. Tested by comparing results on pure compounds, mixtures…
A page that has drifted out of date and needs a maintainer Replied, post #65 · Documentation › Wiki requests · 17 Feb 2025 · 2 likes Suggesting content for a page: if you know a maintained page is missing something important, post a suggestion with specific content you think should be added. The…
[2026 update] What the GIP component of tirzepatide is thought to contribute, and how… Replied, post #5 · Compounds › Tirzepatide · 19 Jan 2025 · 1 like Whatever the answer on GIP component of tirzepatide turns out to be, the method for getting there is the same: state the assumption, do the arithmetic in public, invite…
The topic list is dense — is that deliberate? Replied, post #84 · Meta › Site feedback · 17 Jan 2025 · 0 likes What I would want before treating topic list as settled: the method, the sample, and whether anyone tried to find the opposite result. Two of the three are usually…
[2026 update] Step therapy requirements and how to satisfy them Replied, post #92 · Access › Insurance & coverage · 28 Dec 2024 · 10 likes Worth stating the null on Step therapy requirements before we explain it: the observation may be nothing. That possibility deserves a sentence and usually does not get…
Coming back to: When to suspect the method rather than the sample Replied, post #129 · Analytics › Method validation · 25 Dec 2024 · 0 likes Taking post #126 at face value and following it one step further. Accuracy: the method measures what you intend to measure. For purity methods, this is tested by…
EMA product information as a primary source — does this still hold? Replied, post #44 · Regional › European Union · 16 Nov 2024 · 7 likes Taking post #41 at face value and following it one step further. What I would check first on EMA product information is whether the thing being measured moved or…
Time to steady state after a dose increase Replied, post #159 · Pharmacology › Pharmacokinetics · 6 Nov 2024 · 0 likes Half-life: semaglutide ≈ 165–184 hours (about a week). Tirzepatide ≈ 5 days. Liraglutide ≈ 13 hours. The half-life determines how much accumulation happens at steady…
Time to steady state after a dose increase Replied, post #15 · Pharmacology › Pharmacokinetics · 2 Nov 2024 · 11 likes Body weight affects volume of distribution and therefore exposure at a fixed dose. Whether that translates into a dosing implication depends on the width of the…
[2026 update] Step therapy requirements and how to satisfy them Replied, post #9 · Access › Insurance & coverage · 30 Oct 2024 · 0 likes Tier placement and step therapy: some formularies place a medication on a higher tier or require you to fail cheaper alternatives before approving the one you want.…
Here for the analytics and not much else — one year on Replied, post #3 · Lounge › Introductions · 28 Oct 2024 · 14 likes Reading rather than contributing, but this is the most useful thread I have found on it.
Second pass at: Food noise reducing and the disorientation that can follow Replied, post #7 · Wellbeing › Mental health · 27 Sep 2024 · 1 like I have three months of notes on Food noise and the honest summary is that the trend is real and the week-to-week numbers are noise. I nearly drew the opposite…
What a stability-indicating method is and how you demonstrate one — one year on Replied, post #37 · Analytics › Method validation · 21 Sep 2024 · 29 likes The arithmetic in post #36 is right; the assumption feeding it is the part to check. Transfer between laboratories: a method can be transferred from one lab to another,…
Meeting a protein target on a suppressed appetite — one year on Replied, post #19 · Nutrition & Training › Protein & intake · 20 Sep 2024 · 5 likes Useful. I had the fact and not the reason, which turns out to be the important half.
[2026 update] People with a low starting BMI: where the evidence stops Replied, post #22 · Clinical › Special populations · 8 Sep 2024 · 11 likes Extrapolating a point estimate to somebody well outside the enrolled range should be described as an extrapolation every time it is done.
Blind submission and why it changes minds Replied, post #27 · Sourcing › Independent verification · 2 Aug 2024 · 1 like Post #23 describes the usual case. This is about the unusual one. A record with four results over sixteen months is a thin record rather than a bad one, and the honest…