s.diallo

TL2 · Faro

Contributes reviews on supplier material. Based in Faro.

Joined 19 October 2024 · last posted 9d

76 posts, newest first. Showing up to 150.

Follow-up: Comparing two chromatograms from different laboratories, properly Replied, post #63 · Analytics › HPLC & UHPLC · 19 Jul 2026 · 1 like Mobile-phase preparation is a genuine source of between-laboratory variation. Acid concentration and organic modifier both shift retention, and neither is usually…
Follow-up: Reading an interaction checker output critically Replied, post #53 · Practice › Interactions · 18 Jul 2026 · 0 likes Alcohol is not contraindicated in the labelling and it does irritate a stomach that is already emptying slowly. There is no published interaction study, and the…
Coming back to: Preparing for an appointment: one page, three questions Replied, post #3 · Clinical › Prescriber conversations · 16 Jul 2026 · 33 likes The opening post describes the usual case. This is about the unusual one. A question phrased as "what would you want to see before considering X" is answerable and is…
Osteoarthritis and mechanical versus metabolic improvement — one year on Replied, post #45 · Clinical › Comorbidities · 12 Jul 2026 · 0 likes On Osteoarthritis and mechanical versus metabolic I would separate what is worth knowing from what is worth acting on. The first list is long and the second is short,…
Journal club: what we got wrong in an earlier session Replied, post #67 · Evidence › Journal club · 9 Jul 2026 · 0 likes Picking up post #64: that is the part I would want checked first. The most common failure mode is spending fifty minutes on the effect size and ten on the population.…
Sulfonylureas: the interaction most worth taking seriously — what changed since Replied, post #5 · Practice › Interactions · 8 Jul 2026 · 0 likes The arithmetic in post #2 is right; the assumption feeding it is the part to check. SGLT2 inhibitors: frequently co-administered and relevant to renal and…
Endotoxin and why it is a separate question from purity — what changed since Replied, post #68 · Analytics › Impurities & related substances · 6 Jul 2026 · 6 likes Oxidation at methionine and tryptophan: adds 16 per oxygen. Usually elutes earlier. Oxidation is common in storage, especially if the solution is exposed to light or if…
Journal club: orforglipron phase 2 and the non-peptide question Replied, post #106 · Evidence › Journal club · 30 Jun 2026 · 3 likes Thank you for taking the time. That was more work than a reply usually is.
An 18-month record including the parts that went badly Replied, post #49 · Outcomes › Progress reports · 23 Jun 2026 · 21 likes That is consistent with mine, for whatever one more account is worth.
Revisiting: The best-written scientific paper you have read Replied, post #47 · Lounge › Off topic · 23 Jun 2026 · 6 likes What would change my mind on best-written scientific paper is a second dataset collected by someone with no stake in the first. Until then I hold it loosely and I would…
Prescription requirements and telehealth models — a second dataset Replied, post #65 · Sourcing › Regulatory · 14 Jun 2026 · 1 like That is clearer than the version I had in my head. Thank you.
Semaglutide and gastric emptying — the mechanism behind most of the side-effect profile Replied, post #61 · Compounds › Semaglutide · 12 Jun 2026 · 11 likes Taking post #59 at face value and following it one step further. The C-cell question: semaglutide triggered medullary thyroid carcinoma in rodent toxicology studies. A…
Revisiting: Can a home kit substitute for a laboratory report? A careful no Replied, post #33 · Analytics › Home & field testing · 11 Jun 2026 · 0 likes Reconstitution behaviour is a legitimate home observation. A cake that will not dissolve, a solution that hazes, visible particulate — all are real information and all…
Second pass at: Which categories are strict and which are relaxed, honestly Replied, post #69 · Start Here › Welcome · 5 Jun 2026 · 0 likes 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…
Follow-up: A parcel that arrived warm: a decision process, not a verdict Replied, post #53 · Practice › Storage & stability · 2 Jun 2026 · 9 likes I had written a reply contradicting post #49 and deleted it. Here is what survived. Clarity is a weak test. A solution can lose a significant fraction of its active…
Review: a draft on reconstitution arithmetic, with objections — one year on Replied, post #20 · Documentation › Doc review · 31 May 2026 · 25 likes Reviewing your own nomination is fine and is not sufficient. Somebody else has to read it for the process to mean anything.
Shakes versus food: a pragmatic assessment Replied, post #12 · Nutrition & Training › Protein & intake · 26 May 2026 · 6 likes Protein targets during weight loss: the standard recommendation is 1.6 to 2.2 grams per kilogram of body weight. Individual requirements vary but that range is a…
Gastro-oesophageal reflux: improving or worsening? Replied, post #48 · Clinical › Comorbidities · 23 May 2026 · 26 likes Useful. I had the fact and not the reason, which turns out to be the important half.
Blinding yourself: practical methods and their limits — the long version Replied, post #2 · Research Methods › N-of-1 designs · 22 May 2026 · 0 likes The opening post is the version of this I will quote in future. One addition. Nothing in a personal experiment is medical advice to anyone including yourself, and…
0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Replied, post #46 · Devices › Syringes & needles · 20 May 2026 · 2 likes Fair, and the limits you put on it are the part I will remember.
Coming back to: Time to steady state after a dose increase Replied, post #55 · Pharmacology › Pharmacokinetics · 17 May 2026 · 0 likes Agreed on all of that, and I have nothing to add to it.
GLP-1 receptor distribution: central and peripheral — one year on Replied, post #11 · Pharmacology › Receptor biology · 18 Apr 2026 · 27 likes Long-term receptor changes: very little is known about what happens to receptor expression, signalling, and downstream effects over years of exposure to these…
Pinch or no pinch, and how needle length changes the answer — the long version Replied, post #44 · Practice › Administration · 13 Apr 2026 · 1 like Pinch is a question about a distribution, not about a value, and treating it as a value is what produces the confident wrong answers.
Spike-and-recover accuracy for a peptide assay Replied, post #6 · Analytics › Method validation · 6 Apr 2026 · 5 likes That reframing is the whole thing. The facts I already had.
Choosing which test to pay for, given a fixed budget Replied, post #42 · Sourcing › Independent verification · 27 Mar 2026 · 5 likes The record shows what was measured. Everything beyond that is inference and this site tries to keep the line visible.
Grapefruit: why this class is not the class that cares Replied, post #45 · Practice › Interactions · 16 Mar 2026 · 15 likes Helpful, and short, which on this subject is harder than long.
Revisiting: Sample handling between despatch and injection Replied, post #10 · Analytics › Method validation · 6 Feb 2026 · 1 like Post #6 and I disagree about the size of the effect, not about the direction. Adding a reference point for Sample handling between despatch. Mine is a single case,…
Adsorption to container surfaces and to plastics Replied, post #14 · Pharmacology › Formulation chemistry · 2 Feb 2026 · 9 likes Narrowing post #11, because the general version has more than one answer. I read the earlier replies on adsorption twice before writing this, because I had assumed the…
Prescription requirements and telehealth models Replied, post #73 · Sourcing › Regulatory · 17 Dec 2025 · 15 likes Post #71 is right about the mechanism and I think understates the practical bit. A definition problem is doing most of the work in this prescription requirements and…
The decimal-point error, and the habit that catches it Replied, post #2 · Practice › Reconstitution · 13 Dec 2025 · 22 likes Small correction to my own earlier position on decimal-point error. I had the units the wrong way round, which changes the conclusion by an order of magnitude and…
Adolescents: a distinct evidence base — one year on Replied, post #40 · Clinical › Special populations · 4 Dec 2025 · 15 likes Useful. I had the fact and not the reason, which turns out to be the important half.
Publishing an inconvenient result: a case study — the long version Replied, post #57 · Sourcing › Independent verification · 3 Dec 2025 · 0 likes Combining a chromatographic result with a documentation review gives a more complete picture than two chromatographic results, because the failure modes are different.
How the vendor documentation pages are maintained, and by whom — what changed since Replied, post #100 · Sourcing › Vendor reports · 28 Nov 2025 · 2 likes The arithmetic in post #99 is right; the assumption feeding it is the part to check. The useful distinction on vendor documentation pages is between what was measured…
Persistent vomiting and the threshold for seeking help Replied, post #70 · Safety › Adverse events · 16 Nov 2025 · 6 likes Two claims get bundled together under persistent vomiting and they need separating. The descriptive one — this is what was observed — is usually well supported. The…
Pen dose counters: what a click does and does not guarantee Replied, post #24 · Devices › Pens & autoinjectors · 14 Nov 2025 · 13 likes Pen dose counters would be much easier to settle if anyone reported the denominator. Almost nobody reports the denominator.
When to stop reading forums, including this one Replied, post #44 · Wellbeing › Mental health · 2 Nov 2025 · 6 likes Nothing here is medical advice and several members in this subcategory say plainly that they are describing their own experience only. I would treat that as a working…
SURMOUNT-4 and what withdrawal data does and does not tell an individual — one year on Replied, post #16 · Compounds › Tirzepatide · 19 Oct 2025 · 0 likes Post #13 is the version of this I will quote in future. One addition. I read the earlier replies on SURMOUNT-4 twice before writing this, because I had assumed the…
"Greater than or equal to 99%" as a specification rather than a result Replied, post #52 · Analytics › COA interpretation · 14 Oct 2025 · 2 likes An itemised related-substances table with retention times says considerably more about the synthesis than a single total. A total tells you how much is not the main…
A parcel that arrived warm: a decision process, not a verdict Replied, post #66 · Practice › Storage & stability · 3 Oct 2025 · 0 likes Reading rather than contributing, but this is the most useful thread I have found on it.
Hypertension improvement and when medication needs revisiting Replied, post #72 · Clinical › Comorbidities · 20 Sep 2025 · 28 likes What would change my mind on hypertension improvement is a second dataset collected by someone with no stake in the first. Until then I hold it loosely and I would…
Revisiting: GLP-1 receptor distribution: central and peripheral Replied, post #38 · Pharmacology › Receptor biology · 11 Sep 2025 · 2 likes Receptor occupancy required for a clinical effect is not the same as full occupancy, and dose-response curves flattening at the top is what you would expect from that.…
Revisiting: Reading a denial letter as a specification for your appeal Replied, post #107 · Access › Insurance & coverage · 5 Sep 2025 · 0 likes Formulary status: the list of covered medications and the tier (how much you pay) they are on. Checking the current formulary before going to a clinic appointment saves…
Second pass at: Why this subcategory is stricter about sourcing than most Replied, post #76 · Compounds › Secretagogues & GH axis · 18 Aug 2025 · 2 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…
Coming back to: Why quantitation is the hard part, not detection Replied, post #50 · Analytics › Home & field testing · 12 Aug 2025 · 0 likes Reframing quantitation slightly, because I think the disagreement is about the question rather than the answer. If the question is "does it happen", yes. If it is "how…
When a preprint is the best available evidence and we say so Replied, post #31 · Evidence › Preprints · 7 Aug 2025 · 19 likes Coming back to post #27, because the follow-up matters more than the original answer. Where numbers change between preprint and published version, the changes are not…
Reporting a disappointing outcome, and why it belongs here Replied, post #23 · Outcomes › Progress reports · 5 Aug 2025 · 2 likes Where a series is going to be posted, saying so before the outcome is known is a small precommitment that makes it more honest.
Reading a supplier's product description as a marketing document Replied, post #49 · Compounds › Other compounds · 25 Jul 2025 · 11 likes Adding thanks rather than a view. I do not have a view worth the space.
Repeatability versus intermediate precision Replied, post #112 · Analytics › Method validation · 1 Jul 2025 · 0 likes Reading rather than answering, but this is the post I would point somebody at.
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly Replied, post #113 · Compounds › Tirzepatide · 18 Jun 2025 · 6 likes Speaking only to tirzepatide in type 2 diabetes as I have actually seen it, rather than as it is usually described: the effect is real, it is smaller than the thread…
[2026 update] An appeal that failed, and what I would do differently Replied, post #80 · Access › Insurance & coverage · 12 Jun 2025 · 0 likes Post #79 is right about the mechanism and I think understates the practical bit. A peer-to-peer review is available in many systems and is frequently more productive…
Half-life, steady state, and accumulation worked through Replied, post #41 · Pharmacology › Pharmacokinetics · 30 May 2025 · 2 likes The accumulation ratio for weekly dosing with a week-long half-life is around two, which is why the concentration after several doses is roughly double the…
Revisiting: Filter needles: when they help and what they cost you Replied, post #18 · Devices › Syringes & needles · 8 May 2025 · 27 likes Filter needles are for drawing from glass ampoules where particulate is a real risk. For a stoppered vial they add dead volume in exchange for very little. The general…
How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ Replied, post #59 · Sourcing › Independent verification · 7 May 2025 · 19 likes Cost and turnaround: different services have different pricing and turnaround times. Janoshik's turnaround is weeks by mail; VendorInvestigate documentation review is…
Journal club: STEP 1 and the treatment-policy estimand — does this still hold? Replied, post #75 · Evidence › Journal club · 20 Apr 2025 · 0 likes On post #73 — agreed on the reasoning, with one qualification. Nobody has said the unglamorous part of STEP 1 yet, so: most of the variation is explained by things that…
Follow-up: What other technical communities get right that we do not Replied, post #70 · Lounge › Off topic · 17 Apr 2025 · 7 likes Politics and public policy: healthcare policy that affects access to these compounds is relevant here. Partisan politics is not. That matches what I was told, which is…
[2026 update] Cardiovascular risk: reading the outcome trials as a set Replied, post #14 · Clinical › Comorbidities · 7 Apr 2025 · 27 likes Narrowing post #12, because the general version has more than one answer. One caution on Cardiovascular risk: everything above assumes the underlying documentation is…
A 5 mg vial and a 0.25 mg dose: the arithmetic in full — what changed since Replied, post #44 · Practice › Reconstitution · 5 Apr 2025 · 7 likes Swirling versus inverting versus leaving it alone: the vial can be gently warmed (hands around it) and swirled with a rolling motion. Vigorous shaking introduces air…
Units, standards, and other things that quietly hold the world together Replied, post #12 · Lounge › Off topic · 4 Apr 2025 · 0 likes Adding what did not work for me on units, since the failures never get written up and they are half the useful information.
A page that has drifted out of date and needs a maintainer Replied, post #84 · Documentation › Wiki requests · 2 Apr 2025 · 2 likes Correction requests: if you spot an error in a maintained page, note it here with the specific correction. The maintainer will review and update if justified.
Counter-ion form: the field almost nobody reports — one year on Replied, post #43 · Analytics › COA interpretation · 3 Mar 2025 · 12 likes I keep a log for Counter-ion form specifically because my memory of it turned out to be systematically wrong in one direction. Six weeks of notes cost nothing and…
SNAC and the mechanism of oral peptide absorption Replied, post #17 · Compounds › Oral incretins · 27 Feb 2025 · 6 likes Storage for a small molecule is a different problem from storage for a peptide: generally more robust, generally less temperature-sensitive, and generally more affected…
Reporting a disappointing outcome, and why it belongs here Replied, post #4 · Outcomes › Progress reports · 10 Feb 2025 · 24 likes The arithmetic in the opening post is right; the assumption feeding it is the part to check. Worth stating the null on reporting a disappointing outcome before we…
Canadian access and provincial variation Replied, post #69 · Regional › North America · 8 Feb 2025 · 11 likes The arithmetic in post #66 is right; the assumption feeding it is the part to check. Provincial formularies in Canada are published and are the correct source for…
Research-use-only status: what it means legally and practically — a second dataset Replied, post #80 · Compounds › Other compounds · 3 Feb 2025 · 0 likes On post #78 — agreed on the reasoning, with one qualification. Several compounds discussed here have no published human pharmacokinetics at all. That means half-life…
Gallbladder disease risk with rapid weight loss Replied, post #64 · Clinical › Comorbidities · 29 Jan 2025 · 0 likes On gallbladder disease risk: the maintained page in the documentation commons covers the general case with citations and a review date, which is more reliable than any…
Protein density versus volume when you cannot eat much Replied, post #11 · Nutrition & Training › Protein & intake · 24 Jan 2025 · 0 likes Nobody has said the unglamorous part of protein density versus volume yet, so: most of the variation is explained by things that are boring to write about and easy to…
[2026 update] New subcategory: rationale and scope Replied, post #152 · Meta › Announcements · 15 Jan 2025 · 6 likes Checked the New subcategory claim against the primary source this morning. It survives, with a narrower scope than the version quoted here. Posting the narrower scope.
SURPASS-2 and the comparator dose question that will not go away Replied, post #95 · Compounds › Tirzepatide · 3 Jan 2025 · 10 likes Adding the measurement that post #92 says would settle it. SURPASS-2 looks different depending on whether you are reading the primary literature or the summaries of it,…
Building a sensible monitoring schedule with your prescriber Replied, post #38 · Clinical › Bloodwork · 19 Dec 2024 · 4 likes Time of day: some biomarkers vary across the day. Cortisol in the morning differs from cortisol in the evening. Comparing results from different times of day is…
Journal club: SURMOUNT-1, read without the press release Replied, post #25 · Evidence › Journal club · 9 Dec 2024 · 0 likes Reframing SURMOUNT-1 slightly, because I think the disagreement is about the question rather than the answer. If the question is "does it happen", yes. If it is "how…
Second pass at: A field-by-field walk through a certificate of analysis Replied, post #128 · Analytics › COA interpretation · 24 Nov 2024 · 26 likes Worth separating two things that post #124 runs together. What I can speak to on field-by-field walk through a certificate is narrow, so I will keep it narrow rather…
Journal club: SUSTAIN 6 and its retinopathy signal — does this still hold? Replied, post #4 · Evidence › Journal club · 18 Nov 2024 · 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. The disagreement…
Requesting a page: what makes a good request — what changed since Replied, post #136 · Documentation › Wiki requests · 13 Oct 2024 · 5 likes Scope the request narrowly. A page about one thing gets written and stays current; a page about a field does not.
Coming back to: Purity assay versus content assay: two different numbers Replied, post #49 · Analytics › COA interpretation · 12 Aug 2024 · 2 likes Water content (residual moisture) matters: lyophilised peptide is not dry. A few percent water is normal. The difference between a TFA salt and an acetate salt can be…
The C-cell question: rodent findings and their human context — what changed since Replied, post #4 · Compounds › Semaglutide · 11 Aug 2024 · 0 likes Adding a small correction to the c-cell question summary above rather than a disagreement with it. The substance holds; one of the figures is out by a factor that…
Cold packs, phase-change material, and what survives ten days Replied, post #106 · Sourcing › Logistics · 15 Jul 2024 · 30 likes Coming back to post #104, because the follow-up matters more than the original answer. Nothing in this subcategory is legal advice, and the legal position on importing…