m.duarte

TL2 · Galway

Contributes reviews on supplier material. Based in Galway.

Joined 29 March 2025 · last posted 4d

81 posts, newest first. Showing up to 150.

Reference intervals: how they are constructed and why one in twenty flags — does this… Replied, post #21 · Clinical › Bloodwork · 24 Jul 2026 · 12 likes Post #20 is right about the mechanism and I think understates the practical bit. Biological variation: the person-to-person variation in a biomarker for a healthy…
Named, unnamed and unspecified impurities as regulatory categories — the long version Replied, post #106 · Analytics › Impurities & related substances · 23 Jul 2026 · 1 like Post #104 describes the usual case. This is about the unusual one. Oxidation at methionine or tryptophan adds sixteen per oxygen and typically elutes earlier. In aged…
[2026 update] Interpreting a result that disagrees with the supplier's certificate Replied, post #117 · Sourcing › Independent verification · 23 Jul 2026 · 0 likes Taking post #114 at face value and following it one step further. Worth separating Interpreting a result as a question about the compound from Interpreting a result as…
Primary endpoint hierarchies and why order matters — one year on Replied, post #54 · Evidence › Trials · 21 Jul 2026 · 11 likes I think the Primary endpoint hierarchies question is answerable and has not been answered, which is a more optimistic position than most of this thread.
Common supplements people ask about, assessed one at a time Replied, post #36 · Practice › Interactions · 12 Jul 2026 · 22 likes Post #33 describes the usual case. This is about the unusual one. Mechanistic reasoning about interactions has a poor predictive record. It is a good way to generate a…
About the Mass spectrometry category Replied, post #7 · Analytics › Mass spectrometry · 10 Jul 2026 · 31 likes Post #3 and I disagree about the size of the effect, not about the direction. What mass accuracy establishes: the measured mass is consistent with a specific…
Journal club: indirect comparison between two programmes, defended and attacked Replied, post #104 · Evidence › Journal club · 2 Jul 2026 · 2 likes Everything in post #102 holds. The case it does not cover is the one I have. Second-hand on indirect comparison, so weight it accordingly — someone whose method I trust…
Why a glucagon receptor agonist in a weight-loss compound is not a contradiction Replied, post #17 · Compounds › Retatrutide · 28 Jun 2026 · 25 likes The hepatic-steatosis rationale follows directly from glucagon receptor agonism promoting fat oxidation in the liver. Mechanistic plausibility in this field has a poor…
Coming back to: Payment method and the leverage it gives you, ranked Replied, post #10 · Sourcing › Payments · 25 Jun 2026 · 20 likes Fair, and the limits you put on it are the part I will remember.
A pooled estimate that changed when one trial was added Replied, post #14 · Evidence › Meta-analyses · 24 Jun 2026 · 2 likes A meta-analysis of four small trials is not stronger evidence than one adequately powered trial, whatever the summary statistic looks like.
Alcohol: what is documented and what is folklore Replied, post #58 · Practice › Interactions · 15 Jun 2026 · 18 likes Following this. I have the same question and no better information than the first post.
Micronutrient adequacy at low total intake Replied, post #100 · Nutrition & Training › Protein & intake · 14 Jun 2026 · 6 likes Self-reported intake is optimistic by a consistent margin in the published comparisons, which is worth applying to your own numbers.
A single out-of-range value on an otherwise normal panel Replied, post #56 · Clinical › Bloodwork · 7 Jun 2026 · 27 likes Seconded. It reads as careful rather than confident, which is the right register.
A reconstituted vial's beyond-use date and the reasoning behind common figures Replied, post #48 · Practice › Storage & stability · 4 Jun 2026 · 8 likes Published stability data applies specifically to the formulation studied, under the specific conditions stated. It does not automatically transfer to something…
Revisiting: PCOS and metabolic overlap: what is and is not studied Replied, post #36 · Clinical › Comorbidities · 3 Jun 2026 · 21 likes Where I part company with post #32, and it is a narrow parting. Bariatric surgery history: altered anatomy after surgery affects absorption. That matters for oral…
Revisiting: Mean kinetic temperature explained without the mathematics Replied, post #69 · Practice › Storage & stability · 2 Jun 2026 · 7 likes Post #67 and I disagree about the size of the effect, not about the direction. Temperature excursions: if a vial sat at room temperature for a time, the question is…
Follow-up: Search filters: what is missing Replied, post #117 · Meta › Site feedback · 1 Jun 2026 · 2 likes The arithmetic on Search filters is the easy part and it is where the errors are, which is an uncomfortable combination. Show your working and someone will catch it.
Electrolyte supplements: which ones do anything Replied, post #19 · Nutrition & Training › Hydration & electrolytes · 30 May 2026 · 28 likes I had written a reply contradicting post #15 and deleted it. Here is what survived. Electrolyte supplements is worth one more sentence than it usually gets, and the…
Secretagogues and glucose tolerance: the mechanistic concern Replied, post #3 · Compounds › Secretagogues & GH axis · 14 May 2026 · 15 likes Confirming the opening post from a second method, which matters more than confirming it from a second person. The most useful thing anyone has posted about…
Dizziness on standing: the ordinary explanation first — one year on Replied, post #4 · Nutrition & Training › Hydration & electrolytes · 7 May 2026 · 12 likes What I would tell a new member reading about Dizziness on standing for the first time: the confident posts are not the reliable ones, and the reliable ones are longer.
Run-in periods and the population they select Replied, post #111 · Evidence › Trials · 4 May 2026 · 27 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),…
Converting between mg/mL and units per dose, both directions — the long version Replied, post #46 · Practice › Reconstitution · 20 Apr 2026 · 13 likes Adding the measurement that post #43 says would settle it. A 0.3 mL barrel has more space between graduations than a 1 mL barrel for the same volume, which is the…
The best-written scientific paper you have read Replied, post #2 · Lounge › Off topic · 10 Apr 2026 · 1 like Where the best-written scientific paper reasoning breaks down for me is the step from the group result to the individual case. That step is almost never argued for.
Blind submission and why it changes minds — the long version Replied, post #15 · Sourcing › Independent verification · 9 Apr 2026 · 5 likes Post #13 describes the usual case. This is about the unusual one. Janoshik Analytical: chromatographic purity and mass-spectrometric identity on submitted samples.…
Oral semaglutide bioavailability and its variability between people Replied, post #46 · Compounds › Oral incretins · 2 Apr 2026 · 0 likes The gastrointestinal tolerability profile of the oral formulation is broadly similar in character to the injectable, which supports the effects being systemic rather…
An ABAB design with a data table and honest limitations — a second dataset Replied, post #106 · Research Methods › N-of-1 designs · 26 Mar 2026 · 11 likes Statistical analysis of n-of-1 data: comparing before versus after with a t-test or similar is one approach. Plotting the data visually is another. Both are valid. Not…
Comparing my trajectory with the trial curves, carefully — a second dataset Replied, post #21 · Outcomes › Progress reports · 20 Mar 2026 · 1 like A single scale used throughout beats a more accurate scale introduced halfway through. Consistency beats accuracy for a trend. I would want a second opinion before…
Run-in periods and the population they select Replied, post #80 · Evidence › Trials · 11 Mar 2026 · 0 likes Nothing to add on the substance. Thank you for taking the question at face value.
Packaging that arrived damaged: documenting it properly — a second dataset Replied, post #53 · Sourcing › Logistics · 11 Mar 2026 · 5 likes Peak periods and public holidays affect this more than any other factor and are entirely predictable in advance. The general answer and the answer for your case may…
Preprint servers and what screening they do Replied, post #80 · Evidence › Preprints · 7 Mar 2026 · 0 likes Worth separating two things that post #77 runs together. What changes between preprint and publication: authors respond to reviewer comments, re-analyse data, correct…
The lowest dose that does anything: is that a real question? Replied, post #72 · Practice › Dosing & titration · 6 Mar 2026 · 11 likes Post #69 is the version of this I will quote in future. One addition. Dose equivalence between different incretin analogues is a weak concept. The molecules differ in…
The "under review" status pill and when a moderator applies it Replied, post #3 · Evidence › Preprints · 28 Feb 2026 · 13 likes The most useful convention this subcategory has: state the status, state the version, state the date you checked. Three short clauses and the citation stays honest. I…
Pharmacy supply in the UK and the questions you will be asked Replied, post #40 · Regional › UK & Ireland · 13 Feb 2026 · 33 likes An honest declaration on pharmacy supply: I have a prior here and it is strong enough that you should weight what I say downward. Stating it rather than hiding it.
[2026 update] A rising related-substance total over six months: degradation or method… Replied, post #28 · Analytics › Impurities & related substances · 13 Feb 2026 · 0 likes Adding the measurement that post #27 says would settle it. That last point is the ceiling on what any purity figure can claim. A method that cannot see a species cannot…
Bioimpedance and hydration: why the number moves Replied, post #6 · Outcomes › Body composition · 9 Feb 2026 · 1 like Standardise the conditions: same time of day, same hydration, same recent training, same machine. Most of the variability is protocol rather than physiology.
A parcel stationary at a customs facility for nine days Replied, post #26 · Sourcing › Logistics · 4 Feb 2026 · 5 likes Worth separating two things that post #22 runs together. Documentation after arrival: photograph the parcel and its contents on arrival. If something later turns out…
Second pass at: Choosing a concentration on purpose rather than by accident Replied, post #3 · Practice › Reconstitution · 31 Jan 2026 · 20 likes Everything in the opening post holds. The case it does not cover is the one I have. Choosing a concentration on purpose rather than by accident: starting with "I want…
Revisiting: The report format the maintainers ask for, and why each field is there Replied, post #11 · Sourcing › Vendor reports · 16 Jan 2026 · 11 likes Post #9 describes the usual case. This is about the unusual one. Do not adjust a reported figure. Post what the laboratory said and put your interpretation in a…
Second pass at: Metformin co-administration and additive GI effects Replied, post #33 · Practice › Interactions · 14 Jan 2026 · 15 likes Worth separating two things that post #29 runs together. On Metformin co-administration the community has more anecdote than the confidence in this thread implies, and…
How to ask about something you suspect is a bad idea Replied, post #44 · Start Here › How to Ask · 14 Jan 2026 · 1 like The arithmetic in post #42 is right; the assumption feeding it is the part to check. If the answer you got does not fit your case, say which part does not fit rather…
A partial dose because the pen emptied mid-injection Replied, post #119 · Practice › Administration · 11 Jan 2026 · 14 likes Agreed on partial dose because the pen, with one qualification that I think matters. The reasoning holds for the case as described. Change the starting assumption and…
[2026 update] Reflux appearing for the first time at a dose step Started this topic · Practice › Side effects · 23 Dec 2025 · 0 likes Posting this under the heading it deserves: Reflux appearing for the first time at a dose step Everything below is what sits behind that. Reporting something rather…
How to read a forest plot, properly, from scratch Replied, post #71 · Evidence › Trials · 16 Dec 2025 · 3 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),…
Older adults, sarcopenia risk, and the trade-off nobody quantifies Replied, post #46 · Clinical › Special populations · 6 Dec 2025 · 3 likes Right — I had this wrong and I am glad to have read it before it mattered.
Tracking a preprint to publication: a worked example Replied, post #12 · Evidence › Preprints · 30 Nov 2025 · 25 likes Everything in post #8 holds. The case it does not cover is the one I have. The number people quote for tracking a preprint is a central estimate presented without its…
Journal club: semaglutide in MASH, and surrogate endpoints Started this topic · Evidence › Journal club · 27 Nov 2025 · 10 likes Posting this under the heading it deserves: Journal club: semaglutide in MASH, and surrogate endpoints Everything below is what sits behind that. Working notes on…
Research-use-only labelling: what it means and what it does not Replied, post #64 · Sourcing › Regulatory · 26 Nov 2025 · 0 likes That is a cleaner way of putting what I was circling around.
[2026 update] How much of the diluent volume the powder itself displaces Replied, post #14 · Practice › Reconstitution · 23 Nov 2025 · 0 likes Where I part company with post #10, and it is a narrow parting. Filter needles are worth considering if you are drawing from a glass ampoule and are pointless overhead…
"Greater than or equal to 99%" as a specification rather than a result Replied, post #69 · Analytics › COA interpretation · 12 Nov 2025 · 0 likes Where I part company with post #65, and it is a narrow parting. A chromatogram supplied as a small image is legible for peak shape and not for baseline detail. That is…
Follow-up: What a seizure notice actually says Replied, post #28 · Sourcing › Logistics · 26 Oct 2025 · 0 likes I had written a reply contradicting post #24 and deleted it. Here is what survived. Import restrictions by jurisdiction: what is legal to import for personal use varies…
Discussing something you have already been doing Replied, post #11 · Clinical › Prescriber conversations · 30 Sep 2025 · 32 likes A question phrased as "what would you want to see before considering X" is answerable and is not a request for X. That is all the detail I have. Someone else will have…
Second pass at: Journal club: STEP 4 and what a withdrawal design can prove Replied, post #68 · Evidence › Journal club · 20 Sep 2025 · 1 like Practical answer on STEP 4, since the theoretical one is upthread: do the simplest check first, write down the result, and only then decide whether the complicated…
Reading a rodent study on a secretagogue without over-extrapolating Replied, post #34 · Compounds › Secretagogues & GH axis · 10 Aug 2025 · 17 likes I came in to disagree and I am leaving without a disagreement.
[2026 update] US compounding rules and how they changed Replied, post #30 · Regional › North America · 9 Aug 2025 · 22 likes Post #29 answers the question as asked. The question underneath it is different. Cost comparisons should state whether they include the device and the dispensing fee,…
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly Replied, post #150 · Compounds › Tirzepatide · 29 Jul 2025 · 0 likes Right — I had this wrong and I am glad to have read it before it mattered.
Revisiting: What to include when your question involves arithmetic Replied, post #18 · Start Here › How to Ask · 11 Jul 2025 · 0 likes Second this, and I would have said it less carefully.
Journal club: the CagriSema phase 2 combination paper — a second dataset Replied, post #75 · Evidence › Journal club · 10 Jul 2025 · 16 likes Confirming post #74 from a second method, which matters more than confirming it from a second person. CagriSema phase 2 combination paper: I have looked for the primary…
Follow-up: The lowest dose that does anything: is that a real question? Replied, post #25 · Practice › Dosing & titration · 26 Jun 2025 · 3 likes Worth separating two things that post #23 runs together. The four-week escalation interval is a convention from the pivotal trials, not a pharmacological constant. The…
Ipamorelin selectivity claims and where they came from Replied, post #45 · Compounds › Secretagogues & GH axis · 8 Jun 2025 · 0 likes Coming back to post #41, because the follow-up matters more than the original answer. Effects reported at the level of appetite are the most consistently described and…
The C-cell question: rodent findings and their human context Replied, post #24 · Compounds › Semaglutide · 5 Jun 2025 · 0 likes My experience of c-cell question contradicts the reply above. I am posting it as a data point rather than as a refutation, because one person's experience is exactly…
Coming back to: What published stability data actually covers, and what it does not Replied, post #53 · Practice › Storage & stability · 31 May 2025 · 16 likes Post #52 answers the question as asked. The question underneath it is different. Published stability data covers a specific formulation at a specific concentration in a…
Domestic fridge temperature mapping: a cheap experiment Replied, post #3 · Devices › Cold chain · 27 May 2025 · 2 likes Grateful for the specificity. Vague answers to this question are what sent me looking.
Residual solvents and scavengers: what is looked for Replied, post #10 · Analytics › Impurities & related substances · 6 Apr 2025 · 8 likes I keep a log for residual solvents and scavengers specifically because my memory of it turned out to be systematically wrong in one direction. Six weeks of notes cost…
Import rules for personal quantities, by jurisdiction, dated Started this topic · Sourcing › Regulatory · 28 Mar 2025 · 0 likes On the subject in the title: Import rules for personal quantities, by jurisdiction, dated Working notes rather than a conclusion. I was wrong about import rules for…
Second pass at: Pen dose counters: what a click does and does not guarantee Replied, post #3 · Devices › Pens & autoinjectors · 18 Mar 2025 · 1 like Dose counters: pens show the remaining number of doses. When the counter reaches zero, the pen is empty and cannot deliver more. Noting the counter before injection…
Coming back to: Official shortage notices and what they authorise Replied, post #8 · Access › Shortages · 8 Feb 2025 · 17 likes Supply interruptions: official shortage notices are published by regulatory agencies. That is the correct primary source rather than pharmacy rumors or forum discussion.
Why mass spectrometry cannot tell you about an epimer Replied, post #37 · Analytics › Mass spectrometry · 25 Jan 2025 · 6 likes Confirming post #35 from a second method, which matters more than confirming it from a second person. Purity and identity are different questions: LC-MS establishes…
Follow-up: Individual participant data versus aggregate data Replied, post #7 · Evidence › Meta-analyses · 7 Jan 2025 · 0 likes Marking my uncertainty on Individual participant data versus aggregate explicitly. I am confident about the direction, much less confident about the size, and not…
A promotion I argued against, and why I lost Replied, post #31 · Documentation › Doc review · 16 Dec 2024 · 2 likes This is the answer, and the reason it is the answer is the more useful part.
Coming back to: Preparing for an appointment: one page, three questions Replied, post #122 · Clinical › Prescriber conversations · 14 Dec 2024 · 31 likes Thank you for the correction. I would rather find out here than later.
Coming back to: Grapefruit: why this class is not the class that cares Replied, post #36 · Practice › Interactions · 12 Dec 2024 · 13 likes This is the sort of exchange that makes the archive worth searching.
Meeting a protein target on a suppressed appetite — does this still hold? Replied, post #32 · Nutrition & Training › Protein & intake · 1 Dec 2024 · 0 likes Micronutrition alongside protein: eating protein foods that are also good sources of micronutrients (iron, B vitamins, zinc) solves two problems at once. It cost…
[2026 update] New subcategory: rationale and scope Replied, post #3 · Meta › Announcements · 13 Nov 2024 · 0 likes Helpful, and short, which on this subject is harder than long.
Reading a preclinical wound-healing model and its relevance to a human tendon Replied, post #2 · Compounds › Repair & healing peptides · 5 Nov 2024 · 31 likes Reporting rather than recommending, on reading a preclinical wound-healing model. What happened is above. Whether it should have is a different question and not one I…
[2026 update] Journal club: SURPASS-2 and the semaglutide 1 mg comparator Replied, post #14 · Evidence › Journal club · 22 Oct 2024 · 1 like Saving this. It is the version I will quote when the question comes round again.
Follow-up: Dead volume across syringe and needle combinations Replied, post #42 · Devices › Syringes & needles · 30 Sep 2024 · 13 likes No disagreement from me. Posting only so the question does not look ignored.
About the Introductions category Replied, post #5 · Lounge › Introductions · 3 Sep 2024 · 30 likes No judgment: people come to this community from all backgrounds and with all motivations. Introductions are for getting to know each other, not for evaluation.
Promotion criteria, and the one that stops most nominations Replied, post #26 · Documentation › Doc review · 28 Jul 2024 · 12 likes Post #23 answers the question as asked. The question underneath it is different. Adding a null result on promotion criteria. I looked, carefully, and found nothing, and…
Second pass at: Retatrutide dose escalation in the published trials Replied, post #52 · Compounds › Retatrutide · 19 Jul 2024 · 1 like How to read phase 2 without treating it as phase 3: phase 2 establishes that a dose range produces an effect and is tolerable enough to justify large trials. It does…
The mass-error checker and its intended scope Replied, post #21 · Data & Tools › Calculators · 31 May 2024 · 0 likes I had written a reply contradicting post #17 and deleted it. Here is what survived. I disagree with the framing of mass-error checker above, and I think it is a…
Assessing a warm arrival: the decision process — one year on Replied, post #22 · Sourcing › Logistics · 29 May 2024 · 0 likes Post #21 is the version of this I will quote in future. One addition. I disagree with the framing of Assessing a warm arrival above, and I think it is a substantive…