e.ndiaye

TL2 · Graz

Contributes reviews on supplier material. Based in Graz.

Joined 18 September 2025 · last posted 7h · groups: regional-apac

71 posts, newest first. Showing up to 150.

SURPASS-2 and the comparator dose question that will not go away — what changed since Replied, post #7 · Compounds › Tirzepatide · 28 Jul 2026 · 7 likes Titration schedules for tirzepatide have more dose steps than semaglutide partly because the compound is more potent and partly because the clinical programme used a…
[2026 update] Travelling with an injectable: documentation and practicalities Replied, post #73 · Access › International · 11 Jul 2026 · 10 likes Post #72 is right about the mechanism and I think understates the practical bit. Nothing here is legal advice, and in this subcategory that caveat is doing real work…
What is genuinely unknown about long-term amylin agonism Replied, post #4 · Compounds › Cagrilintide & amylin analogues · 4 Jul 2026 · 9 likes On analysis: an amylin analogue and its aggregates are not equally detectable by a standard reversed-phase method, because a large aggregate may not elute at all. Area…
Coming back to: A structured critique template this community uses Replied, post #48 · Evidence › Study critique · 2 Jul 2026 · 21 likes I read post #46 twice before replying, because I had assumed the opposite. When you change your mind: if a reply convinces you that your criticism was not well-founded,…
Personal or family history of medullary thyroid carcinoma Replied, post #9 · Safety › Contraindications · 23 Jun 2026 · 33 likes Somebody's condition being on a list does not settle the decision, and somebody's condition being absent from one does not either.
What a certificate commits its issuer to — the long version Replied, post #13 · Analytics › COA interpretation · 8 Jun 2026 · 5 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…
Review: a draft on reconstitution arithmetic, with objections — one year on Replied, post #23 · Documentation › Doc review · 6 Jun 2026 · 0 likes Post #21 describes the usual case. This is about the unusual one. The most useful review comment names a sentence and says what is wrong with it. General approval and…
Comparing prices across jurisdictions without misleading yourself Replied, post #34 · Access › Pricing · 3 Jun 2026 · 32 likes Post #32 and I disagree about the size of the effect, not about the direction. An honest declaration on comparing prices across jurisdictions: I have a prior here and…
When a dose reduction is the correct response to a side effect — a second dataset Replied, post #14 · Practice › Dosing & titration · 29 May 2026 · 14 likes Worth separating two things that post #12 runs together. Holding a dose indefinitely: the trials did not study indefinite holding at a non-maximum dose. The trials…
Interim analyses and stopping rules Replied, post #24 · Evidence › Trials · 24 May 2026 · 7 likes Post #23 is the version of this I will quote in future. One addition. Trying to state the interim analyses and stopping rules position in a way that someone who…
Gradient steepness and apparent purity: a worked comparison — the long version Replied, post #2 · Analytics › HPLC & UHPLC · 13 May 2026 · 15 likes Before anything else: what was the gradient, and at what wavelength? Area percent at different wavelengths is not the same number even on the same sample because…
Coming back to: Specificity, linearity, accuracy, precision, range, robustness — with… Replied, post #11 · Analytics › Method validation · 2 May 2026 · 0 likes That matches what I have seen, for whatever a single anecdote is worth.
Molecular mass of semaglutide and why the figure differs between sources Replied, post #36 · Compounds › Semaglutide · 14 Apr 2026 · 24 likes The confident answers on molecular mass of semaglutide and the well-sourced answers are not the same answers, which is the most useful thing I have learned reading this…
Spike-and-recover accuracy for a peptide assay Replied, post #50 · Analytics › Method validation · 8 Apr 2026 · 1 like What would change my mind on spike-and-recover accuracy is a second dataset collected by someone with no stake in the first. Until then I hold it loosely and I would…
[2026 update] Charge states for a 4 kDa peptide, worked through Replied, post #48 · Analytics › Mass spectrometry · 2 Apr 2026 · 1 like The arithmetic for a doubly charged species is (M + 2 x 1.00728) / 2, and the analogous expression for higher charge states. Working it through once makes the reported…
A payment that went through twice: how it was resolved Replied, post #21 · Sourcing › Payments · 19 Mar 2026 · 1 like Worth separating two things that post #17 runs together. Confirming the total before paying rather than after is obvious and is skipped constantly, particularly where…
Pharmacy supply in the UK and the questions you will be asked Replied, post #78 · Regional › UK & Ireland · 16 Mar 2026 · 11 likes That is clearer than the version I had in my head. Thank you.
Warfarin and altered intake: the monitoring argument — the long version Replied, post #132 · Practice › Interactions · 14 Mar 2026 · 1 like Post #129 describes the usual case. This is about the unusual one. Insulin interaction: semaglutide and tirzepatide are not contraindicated with insulin but the…
Dizziness on standing and the electrolyte explanation — does this still hold? Replied, post #54 · Practice › Side effects · 8 Mar 2026 · 0 likes Dizziness on standing came up in a thread eighteen months ago and was answered well. I cannot find it, which is itself the problem, so here is the reconstruction.
Specification in the result column: why that is a meaningful error Replied, post #124 · Analytics › COA interpretation · 17 Feb 2026 · 1 like 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…
Mass error in ppm: the arithmetic and the caveat Replied, post #113 · Analytics › Mass spectrometry · 15 Feb 2026 · 2 likes I had written a reply contradicting post #110 and deleted it. Here is what survived. Mass error in ppm is a good example of a question where the honest answer is boring…
[2026 update] Confounding by indication, explained with a concrete example Replied, post #43 · Evidence › Study critique · 11 Feb 2026 · 13 likes Generalisability and validity are separate axes. A trial can be internally impeccable and still tell you nothing about the person asking. I am confident about the…
Storing lyophilised material long term: what governs the shelf life Replied, post #57 · Practice › Storage & stability · 8 Feb 2026 · 8 likes Lyophilised material is far more stable than the same material in solution. That is why suppliers ship it dry, and it is the reason to reconstitute only what will be…
Coming back to: Reading a supplier's product description as a marketing document Replied, post #17 · Compounds › Other compounds · 7 Feb 2026 · 30 likes A compound with no established assay is a compound where a certificate can say almost anything. That is not an accusation about anyone; it is a statement about what a…
Measurement error in home scales, with a worked standard deviation — the long version Replied, post #18 · Research Methods › Statistics · 24 Jan 2026 · 28 likes I have no financial interest in anything named in this thread and I want to say so before I comment on Measurement error in home scales, because it is the sort of…
Temperature loggers worth the money — the long version Replied, post #117 · Devices › Cold chain · 21 Jan 2026 · 16 likes Temperature loggers in the parcel exist and are occasionally used for high-value shipments. They are the only thing that turns an argument about transit into a record.…
Reconstitution volumes that produce round numbers, tabulated Replied, post #25 · Practice › Reconstitution · 14 Jan 2026 · 1 like The reason reconstitution volumes is hard to answer is that the obvious measurement and the relevant quantity are not the same thing, and substituting one for the other…
Vomiting: when it is expected and when it is a reason to stop Replied, post #107 · Practice › Side effects · 30 Dec 2025 · 4 likes The published rates come from populations that were titrated on a defined schedule with clinical supervision. Rates from a forum are not comparable and are biased by…
Can a home kit substitute for a laboratory report? A careful no Replied, post #79 · Analytics › Home & field testing · 15 Dec 2025 · 6 likes Worth separating two things that post #77 runs together. Weighing vials against declared fill is the most underrated home check available. It needs a balance with…
Tracking a preprint to publication: a worked example Replied, post #110 · Evidence › Preprints · 11 Dec 2025 · 24 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…
Liver enzymes drifting down and what that usually means Replied, post #31 · Clinical › Bloodwork · 27 Nov 2025 · 0 likes Thank you for taking the time. That was more work than a reply usually is.
[2026 update] How much of the diluent volume the powder itself displaces Replied, post #53 · Practice › Reconstitution · 25 Nov 2025 · 0 likes Agreed on all of that, and I have nothing to add to it.
Power cut for eleven hours: how I assessed it afterwards Replied, post #99 · Practice › Storage & stability · 17 Oct 2025 · 6 likes Where the power cut for eleven hours discussion usually stalls is that nobody wants to say "I do not know" and everyone is willing to say "it varies". Those are the…
A 10 mg vial reconstituted three different ways, compared — the long version Replied, post #140 · Practice › Reconstitution · 7 Oct 2025 · 14 likes Osmolarity and reconstitution: the osmolarity of the reconstituted solution affects comfort on injection. Isotonic solutions (close to blood osmolarity) are less…
Cagrilintide's dosing interval and the pharmacokinetics behind it Replied, post #82 · Compounds › Cagrilintide & amylin analogues · 5 Oct 2025 · 24 likes Thank you for taking the time. That was more work than a reply usually is.
Coming back to: Why quantitation is the hard part, not detection Replied, post #73 · Analytics › Home & field testing · 2 Oct 2025 · 0 likes A home refractometer is not measuring what people hope it is measuring in these preparations, and the readings are dominated by everything other than the peptide.
Coming back to: What published stability data actually covers, and what it does not Replied, post #149 · Practice › Storage & stability · 24 Sep 2025 · 8 likes Published stability data covers a specific formulation at a specific concentration in a specific container. A home-reconstituted preparation matches none of those, and…
Why "any advice?" is the least effective ending for a post — the long version Replied, post #53 · Start Here › How to Ask · 13 Sep 2025 · 14 likes Disagreeing with an answer you got: cite what you disagree with, say what contradicts it, and ask which one holds. Do not open with "I think you are wrong". Lead with…
Are there stupid questions here? A staff answer, at length Replied, post #143 · Start Here › Welcome · 2 Sep 2025 · 1 like 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…
Pinch or no pinch, and how needle length changes the answer Replied, post #43 · Practice › Administration · 2 Sep 2025 · 1 like On post #39 — agreed on the reasoning, with one qualification. If you have to inject at a different time of day than usual, that is a much smaller perturbation than it…
Coming back to: Resolution and tailing factor: real acceptance criteria Replied, post #41 · Analytics › HPLC & UHPLC · 19 Aug 2025 · 0 likes Confirming post #40 from a second method, which matters more than confirming it from a second person. Gradient slope is the single biggest driver of apparent purity…
What a documentation review can and cannot tell you Replied, post #70 · Sourcing › Independent verification · 12 Aug 2025 · 0 likes On post #68 — agreed on the reasoning, with one qualification. The most useful reply I ever got about documentation review was a request to state my units. It sounds…
Appeal templates and why they are deliberately unemotional Replied, post #9 · Access › Insurance & coverage · 27 Jul 2025 · 19 likes This follows post #7 rather than contradicting it. Where an exception process exists separately from an appeal, they are different routes with different criteria and…
Revisiting: What to include when your question involves arithmetic Replied, post #22 · Start Here › How to Ask · 16 Jul 2025 · 2 likes Context that matters: compound, how long in, current dose, relevant history. Context that does not matter: how you feel, your hopes for the outcome, your medical…
Forced degradation studies: designing one that is informative — does this still hold? Replied, post #39 · Analytics › Method validation · 14 Jul 2025 · 7 likes Reading rather than contributing, but this is the most useful thread I have found on it.
Detection wavelength and why 214 nm and 280 nm disagree Replied, post #18 · Analytics › HPLC & UHPLC · 13 Jul 2025 · 11 likes Reversed-phase separates on hydrophobicity. A peptide is retained on a non-polar stationary phase and eluted by increasing organic solvent. For peptides the mobile…
A well-designed study with a badly written abstract Replied, post #105 · Evidence › Study critique · 25 May 2025 · 6 likes Surrogate endpoints are not automatically bad and their validity is compound-specific and population-specific. The question is whether this surrogate has been validated…
Second pass at: Retatrutide mass and identity: what a report should show Replied, post #50 · Compounds › Retatrutide · 23 May 2025 · 4 likes Narrowing post #49, because the general version has more than one answer. The arithmetic on Retatrutide mass and identity is the easy part and it is where the errors…
When to stop reading forums, including this one — the long version Replied, post #24 · Wellbeing › Mental health · 20 May 2025 · 11 likes I read post #22 twice before replying, because I had assumed the opposite. Mood changes reported during substantial weight loss have several plausible contributors and…
A well-designed study with a badly written abstract Replied, post #49 · Evidence › Study critique · 28 Apr 2025 · 0 likes Two things can be true about well-designed study at once: the mechanism is plausible and the evidence for the size of the effect is thin. Most of the argument here is…
Follow-up: Documentation that appears only after payment Replied, post #19 · Sourcing › Red flags · 24 Apr 2025 · 0 likes I had read the opposite somewhere and cannot now find where, which tells me something.
Charge states for a 4 kDa peptide, worked through Replied, post #85 · Analytics › Mass spectrometry · 12 Mar 2025 · 29 likes Adding a note of thanks rather than an opinion. I did not know most of that.
Charge states for a 4 kDa peptide, worked through Replied, post #64 · Analytics › Mass spectrometry · 10 Mar 2025 · 31 likes Coming back to post #62, because the follow-up matters more than the original answer. Charge states is worth one more sentence than it usually gets, and the sentence is…
BPC-157: what the rodent literature actually shows, and what it does not — a second… Replied, post #16 · Compounds › Repair & healing peptides · 20 Feb 2025 · 10 likes Taking post #15 at face value and following it one step further. Stability of BPC-157 in solution: what has been measured in published work covers specific formulations…
Consistent declarations and why they matter more than clever ones Replied, post #30 · Sourcing › Logistics · 14 Feb 2025 · 18 likes Having read the whole consistent declarations thread before replying: the question in the first post has not actually been answered yet, and three of us have answered a…
Second pass at: Triple agonism: additive, synergistic, or neither? Replied, post #14 · Compounds › Retatrutide · 12 Feb 2025 · 9 likes Filing a mild objection to the consensus on Triple agonism. Mild because I might be wrong; an objection because nobody has addressed the case that does not fit.
Random versus fixed effects: choosing rather than defaulting — a second dataset Replied, post #7 · Evidence › Meta-analyses · 25 Jan 2025 · 9 likes High heterogeneity is the finding rather than a nuisance to be minimised. If the effect genuinely differs across settings, an average of those settings is an average of…
Recovery when intake is low: what to cut first Replied, post #7 · Nutrition & Training › Resistance training · 9 Jan 2025 · 17 likes Deload weeks: periodic weeks (every 4 to 8 weeks) with reduced volume and intensity can help with recovery and sometimes reveal strength gains that got obscured by…
Fixed versus detachable needles: the trade-offs Replied, post #93 · Devices › Syringes & needles · 5 Jan 2025 · 29 likes Everything in post #89 holds. The case it does not cover is the one I have. Fixed versus detachable needles: insulin syringes usually have fixed needles (no dead volume…
Revisiting: Bug report: the reconstitution calculator and a rounding edge case Replied, post #40 · Data & Tools › Calculators · 4 Jan 2025 · 19 likes Right — I had this wrong and I am glad to have read it before it mattered.
Revisiting: Semaglutide formulation: what is in the licensed product besides the peptide Replied, post #76 · Compounds › Semaglutide · 3 Jan 2025 · 9 likes Post #75 answers the question as asked. The question underneath it is different. Albumin binding is not a unique structural feature and nothing in the class lacks it,…
Domestic fridge temperature mapping: a cheap experiment — what changed since Replied, post #28 · Devices › Cold chain · 29 Dec 2024 · 10 likes The arithmetic in post #27 is right; the assumption feeding it is the part to check. Temperature excursions: brief excursions above 8 °C are tolerable for most…
Dose numbers for oral formulations are not comparable to injectable ones — a second… Replied, post #3 · Compounds › Oral incretins · 28 Dec 2024 · 0 likes Anyone comparing published oral and injectable efficacy should check whether the comparison is within one trial or across two. Across two, the populations differ and…
Research-use-only status: what it means legally and practically — a second dataset Replied, post #43 · Compounds › Other compounds · 19 Dec 2024 · 2 likes I had written a reply contradicting post #41 and deleted it. Here is what survived. The reason Research-use-only status is hard to answer is that the obvious…
[2026 update] How to read a forest plot, properly, from scratch Replied, post #24 · Evidence › Trials · 9 Dec 2024 · 0 likes Risk of bias: structured appraisal of internal validity. Key things to assess: randomisation method (was it truly random or could someone predict the next assignment),…
Time to steady state after a dose increase Replied, post #77 · Pharmacology › Pharmacokinetics · 4 Nov 2024 · 20 likes That matches what I have seen, for whatever a single anecdote is worth.
A well-designed study with a badly written abstract — does this still hold? Started this topic · Evidence › Study critique · 29 Sep 2024 · 18 likes A well-designed study with a badly written abstract — does this still hold? I have a specific reason for asking rather than idle curiosity, and the context is below.…
Follow-up: A site rotation scheme that is easy enough to actually follow Replied, post #10 · Practice › Administration · 5 Sep 2024 · 6 likes The arithmetic on site rotation scheme is the easy part and it is where the errors are, which is an uncomfortable combination. Show your working and someone will catch…
Guidelines revision: what changed and why Replied, post #105 · Meta › Announcements · 28 Jul 2024 · 0 likes I have been on both sides of the guidelines revision argument in this category within eighteen months, which should tell you how strong the evidence for either side is.
Follow-up: Conditions that change the calculus rather than forbidding it Replied, post #14 · Safety › Contraindications · 18 Jul 2024 · 0 likes This follows post #13 rather than contradicting it. A rodent toxicology finding underlying a contraindication is worth understanding, because it explains why the…
How this community labels and discusses unrefereed work Replied, post #13 · Evidence › Preprints · 11 Jun 2024 · 26 likes Post #9 describes the usual case. This is about the unusual one. Taking community labels seriously for a moment rather than deflecting: the honest position is that the…