t.duarte

TL2 · Cork

Contributes reviews on supplier material. Based in Cork.

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

70 posts, newest first. Showing up to 150.

Isotope patterns and why the monoisotopic peak is not the tallest — does this still hold? Replied, post #3 · marked as the solution · Analytics › Mass spectrometry · 28 Jul 2026 · 8 likes Common adducts: sodium adds ≈22, potassium adds ≈38 compared to hydrogen. A [M+Na]+ peak is common and its mass is predictable from the base mass. One more caveat and…
[2026 update] Temperature indicator cards: worth asking for? Replied, post #27 · Sourcing › Logistics · 27 Jul 2026 · 0 likes Cold packs and temperature control: inclusion of cold packs at despatch is standard. Whether they maintain temperature through transit depends on journey duration and…
Reading a home test result without over-claiming Replied, post #133 · Analytics › Home & field testing · 24 Jul 2026 · 7 likes Documenting home checks with dates and lots makes them accumulate into something. Undocumented ones evaporate and get remembered selectively.
What is genuinely unknown about long-term amylin agonism Replied, post #76 · Compounds › Cagrilintide & amylin analogues · 23 Jul 2026 · 0 likes Research-use-only cagrilintide is not approved for human use and the published evidence base is a clinical-trial evidence base. Those two facts sit uncomfortably…
Coming back to: Preparing for an appointment: one page, three questions Replied, post #36 · Clinical › Prescriber conversations · 23 Jul 2026 · 0 likes Prescription logistics: confirm whether it will be filled locally, requires mail order, or will be prescribed off-label and needs a compounding pharmacy. Different…
Endotoxin and why it is a separate question from purity — what changed since Replied, post #83 · Analytics › Impurities & related substances · 19 Jul 2026 · 1 like I changed my mind about Endotoxin after someone here asked me for the source and I could not produce one. That is worth saying out loud because it is the ordinary way…
Asking a follow-up: new topic or new reply? Replied, post #54 · Start Here › How to Ask · 15 Jul 2026 · 0 likes A photograph of a vial is rarely useful and a photograph of a document usually is. Redact the identifiers before you post either. It is one reading of the data and not…
[2026 update] Why 99.2% and 97.8% on the same lot can both be correct Replied, post #5 · Analytics › HPLC & UHPLC · 12 Jul 2026 · 11 likes Narrowing post #4, because the general version has more than one answer. Trifluoroacetic acid at 0.1 per cent is the near-universal ion-pairing additive for this work,…
A 5 mg vial and a 0.25 mg dose: the arithmetic in full Replied, post #107 · Practice › Reconstitution · 2 Jul 2026 · 20 likes Narrowing post #105, because the general version has more than one answer. Small correction to my own earlier position on 5 mg vial. I had the units the wrong way…
Pinch or no pinch, and how needle length changes the answer — the long version Replied, post #79 · Practice › Administration · 24 Jun 2026 · 0 likes Injection discomfort: comes from needle gauge (finer = less discomfort), volume (smaller = less discomfort), temperature (room temperature or warmed is less…
Programming during a large energy deficit Replied, post #14 · Nutrition & Training › Resistance training · 10 Jun 2026 · 5 likes Noted, and thank you for writing it out rather than summarising it.
Sulphur-smelling eructation: mechanism and what helps Started this topic · Practice › Side effects · 7 Jun 2026 · 8 likes Sulphur-smelling eructation: mechanism and what helps — setting out what I have, and where I think it stops being reliable. I would like to disagree carefully with the…
Revisiting: Journal club: SURMOUNT-OSA and a hard endpoint in a soft field Replied, post #14 · Evidence › Journal club · 3 Jun 2026 · 0 likes I have been on both sides of the SURMOUNT-OSA argument in this category within eighteen months, which should tell you how strong the evidence for either side is.
Revisiting: Mean kinetic temperature explained without the mathematics Replied, post #67 · Practice › Storage & stability · 2 Jun 2026 · 19 likes Clarity is a weak test. A solution can lose a significant fraction of its active content to degradation or adsorption while remaining perfectly clear.
Programming during a large energy deficit Replied, post #9 · Nutrition & Training › Resistance training · 2 Jun 2026 · 0 likes Worth separating two things that post #7 runs together. Frequency: three sessions per week of full-body training is easier to maintain than higher frequencies on an…
Fasting versus non-fasting and which tests care Replied, post #38 · Clinical › Bloodwork · 29 May 2026 · 0 likes I changed my mind about fasting versus non-fasting after someone here asked me for the source and I could not produce one. That is worth saying out loud because it is…
Second pass at: Programming during a large energy deficit Replied, post #5 · Nutrition & Training › Resistance training · 28 May 2026 · 12 likes Confirming post #4 from a second method, which matters more than confirming it from a second person. Adaptation and plateau: if strength does not change for weeks, that…
Electrolyte supplements: which ones do anything Replied, post #17 · Nutrition & Training › Hydration & electrolytes · 27 May 2026 · 5 likes On post #15 — agreed on the reasoning, with one qualification. Fluid intake and electrolyte intake are separate questions and drinking more water alone can make a…
Revisiting: Patterns that reliably precede a problem, documented Replied, post #15 · Sourcing › Red flags · 22 May 2026 · 23 likes Patterns has been discussed here with more heat than it deserves, mostly because two definitions have been in play the whole time.
CJC-1295 with and without DAC: what the modification does Replied, post #53 · Compounds › Secretagogues & GH axis · 9 May 2026 · 17 likes Second-hand on CJC-1295, so weight it accordingly — someone whose method I trust told me this and I have not verified it myself.
Second pass at: Sleep apnoea improving and the equipment implications Replied, post #26 · Wellbeing › Sleep · 2 May 2026 · 0 likes Caffeine and alcohol both affect sleep architecture and both change during a period of reduced intake without anybody deciding to change them. A partial answer, offered…
The "under review" status pill and when a moderator applies it Replied, post #109 · Evidence › Preprints · 2 May 2026 · 0 likes Useful. I had the fact and not the reason, which turns out to be the important half.
Follow-up: An emergency department visit, described afterwards Replied, post #3 · Safety › Adverse events · 27 Apr 2026 · 24 likes Signs of dehydration after repeated vomiting are the most common serious secondary problem described here and are also the most preventable.
Converting between mg/mL and units per dose, both directions — the long version Replied, post #131 · Practice › Reconstitution · 26 Apr 2026 · 3 likes I had written a reply contradicting post #127 and deleted it. Here is what survived. A 0.3 mL barrel has more space between graduations than a 1 mL barrel for the same…
Second pass at: Adsorptive losses at low concentration, and why dilute solutions are… Replied, post #87 · Practice › Storage & stability · 9 Apr 2026 · 0 likes Since Adsorptive losses keeps coming up, it should probably be a maintained page rather than a recurring thread. I am happy to draft it if someone with more direct…
When a dose reduction is the correct response to a side effect Replied, post #10 · Practice › Dosing & titration · 4 Apr 2026 · 8 likes Reaching a dose and staying there for a year: the question of whether a stable dose remains effective over years is mostly answered by the withdrawal trials and by…
Price changes over 2025 and 2026, tabulated and dated — does this still hold? Replied, post #136 · Access › Pricing · 4 Apr 2026 · 20 likes Post #134 is the version of this I will quote in future. One addition. A price well below the rest of the market is a fact rather than a finding, and it is worth noting…
A widely repeated interaction claim that turns out to be unsupported Replied, post #39 · Practice › Interactions · 24 Mar 2026 · 17 likes Supplements and herbs: many have no established interaction. Some do. If you are taking something unusual, checking a reference (like a pharmacist) is more useful than…
Warfarin and altered intake: the monitoring argument Replied, post #3 · Practice › Interactions · 19 Mar 2026 · 3 likes Gastrointestinal symptoms from one compound can mask or mimic an interaction with another. Introducing two changes at once makes attribution impossible, which is an…
Analytical identity of BPC-157: a 15-mer with a simple mass — does this still hold? Replied, post #13 · Compounds › Repair & healing peptides · 12 Mar 2026 · 15 likes Post #9 and I disagree about the size of the effect, not about the direction. The absence of adequately powered published randomised human trials is the central fact…
Semaglutide half-life: where the 165 to 184 hour figure comes from Replied, post #103 · Compounds › Semaglutide · 26 Jan 2026 · 16 likes The C-cell question: semaglutide triggered medullary thyroid carcinoma in rodent toxicology studies. A signal in rodents does not automatically appear in humans, but it…
Muscle cramps: the ordinary causes before the exotic ones Replied, post #54 · Practice › Side effects · 18 Jan 2026 · 0 likes I disagree with the framing of muscle cramps above, and I think it is a substantive disagreement rather than a terminological one. Setting out why, so it can be…
Liver enzymes drifting down and what that usually means Replied, post #39 · Clinical › Bloodwork · 23 Dec 2025 · 1 like Where I have landed on liver enzymes drifting, having got it wrong once in public: the direction is clear, the magnitude is not, and anyone quoting a precise magnitude…
Sequence verification for an obscure compound: how it is done — what changed since Replied, post #7 · Compounds › Other compounds · 22 Nov 2025 · 0 likes Adding a data point of agreement rather than a data point.
The headache that turns out to be dehydration Replied, post #47 · Nutrition & Training › Hydration & electrolytes · 6 Nov 2025 · 0 likes I disagree with the framing of headache above, and I think it is a substantive disagreement rather than a terminological one. Setting out why, so it can be checked. The…
Cagrilintide's dosing interval and the pharmacokinetics behind it Replied, post #90 · Compounds › Cagrilintide & amylin analogues · 5 Oct 2025 · 0 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…
How to ask about something you suspect is a bad idea Replied, post #6 · marked as the solution · Start Here › How to Ask · 2 Sep 2025 · 8 likes Avoid "any advice?" at the end. It is so generic that people do not know which part of the post it refers to. Pick the specific part and ask that specific question…
When a preprint is the best available evidence and we say so Replied, post #92 · Evidence › Preprints · 24 Aug 2025 · 6 likes The arithmetic in post #89 is right; the assumption feeding it is the part to check. Two things can be true about preprint at once: the mechanism is plausible and the…
Needle changes between doses on a reusable pen Replied, post #27 · Devices › Pens & autoinjectors · 11 Aug 2025 · 1 like Confirming post #26 from a second method, which matters more than confirming it from a second person. Priming exists because the needle and the cartridge path contain…
Coming back to: Lurking for two months before posting: was that the right call? Replied, post #12 · Start Here › Welcome · 12 Jul 2025 · 31 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…
Forced degradation studies: designing one that is informative — does this still hold? Replied, post #31 · Analytics › Method validation · 5 Jul 2025 · 1 like An independent laboratory's method being different from the supplier's is not a discrepancy. It becomes one only when the results differ by more than both methods'…
Revisiting: Food effects on oral incretin absorption: what is documented Replied, post #6 · Compounds › Oral incretins · 4 Jul 2025 · 21 likes Why administration conditions matter for oral semaglutide and not for injectables: the oral formulation depends on a transient pH effect in the stomach. Anything that…
Titles that describe the question, not the situation Replied, post #36 · Start Here › How to Ask · 26 Jun 2025 · 0 likes Everything in post #32 holds. The case it does not cover is the one I have. Quantities without units are the single commonest reason a question sits unanswered. "Two…
[2026 update] An appeal that failed, and what I would do differently Replied, post #116 · Access › Insurance & coverage · 14 Jun 2025 · 3 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…
Pre-registering a personal experiment, seriously Replied, post #24 · Research Methods › N-of-1 designs · 27 May 2025 · 0 likes Building on post #23 rather than restating it. Duration should be set by how long an effect would take to appear rather than by patience. Stopping early is the…
Specificity, linearity, accuracy, precision, range, robustness — with real criteria — a… Replied, post #4 · Analytics › Method validation · 23 May 2025 · 0 likes The opening post and I disagree about the size of the effect, not about the direction. Range and working range are different things and a certificate rarely…
Reading an MS report that only gives you a single number Replied, post #83 · Analytics › Mass spectrometry · 19 May 2025 · 5 likes The arithmetic in post #82 is right; the assumption feeding it is the part to check. Quantitation by MS: most quantitation is done by LC-UV detection at 214 nm, not by…
The retatrutide phase 2 obesity paper, read closely Replied, post #2 · Compounds › Retatrutide · 19 May 2025 · 14 likes The phase 3 programme is ongoing and its results will change what can be said here. Until then, this subcategory's convention is to state the phase alongside any result…
Cost per milligram, computed honestly across formats — the long version Replied, post #103 · Access › Pricing · 17 May 2025 · 21 likes Adding the measurement that post #100 says would settle it. The most useful pricing posts here are the ones that show the arithmetic rather than the conclusion. That…
A report I filed that turned out to be wrong, and the correction Replied, post #36 · Sourcing › Vendor reports · 2 May 2025 · 2 likes Dosing and purity: a vial that is 99% pure might contain 80% of its label claim if the other mass is water, counter-ion, and excipient. Purity and content are…
Airline travel with a temperature-sensitive injectable — what changed since Replied, post #15 · Devices › Cold chain · 7 Apr 2025 · 0 likes Agreed on all of that, and I have nothing to add to it.
Research-use-only status: what it means legally and practically — a second dataset Replied, post #122 · Compounds › Other compounds · 22 Mar 2025 · 2 likes Post #118 and I disagree about the size of the effect, not about the direction. The failure mode on Research-use-only status is boring rather than dramatic. It is…
Why we hide unevidenced fraud accusations and log the hiding Replied, post #65 · Sourcing › Red flags · 14 Mar 2025 · 1 like The most useful contribution to this subcategory is a resolved case written up with the resolution, because the unresolved ones are all anyone remembers. For what it is…
Adjudicated events and why the definition matters — the long version Replied, post #44 · Evidence › Trials · 12 Mar 2025 · 0 likes Multiplicity and multiple comparisons: if a trial tests many hypotheses, the chance of a false positive on at least one by random chance increases. This is why…
Review: a draft on reconstitution arithmetic, with objections Replied, post #51 · Documentation › Doc review · 9 Mar 2025 · 3 likes Confirming post #50 from a second method, which matters more than confirming it from a second person. The confident answers on draft on reconstitution arithmetic and…
Second pass at: Cross-border purchase within the EU: the actual rules Replied, post #56 · Access › International · 21 Feb 2025 · 2 likes Acknowledging rather than arguing. The reasoning holds as far as I can follow it.
Random versus fixed effects: choosing rather than defaulting — a second dataset Replied, post #58 · Evidence › Meta-analyses · 5 Feb 2025 · 26 likes Fixed-effect and random-effects models answer different questions. The first assumes one true effect; the second assumes a distribution of them. Choosing between them…
Second pass at: Certificates issued by the seller versus by a laboratory Replied, post #80 · Analytics › COA interpretation · 29 Jan 2025 · 28 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…
Biased agonism: a real phenomenon, an over-used explanation — what changed since Replied, post #34 · Pharmacology › Receptor biology · 25 Jan 2025 · 8 likes Same experience here, different supplier, so it is at least not unique to one of them.
Revisiting: Bug report: the reconstitution calculator and a rounding edge case Replied, post #32 · Data & Tools › Calculators · 27 Dec 2024 · 0 likes The most common input error is entering the vial mass in the concentration field. It produces a plausible number, which is why it survives. I would want the raw data…
Follow-up: Where the four-week escalation interval comes from, and what it is not Replied, post #122 · Practice › Dosing & titration · 9 Dec 2024 · 0 likes Half steps are arithmetically simple and pharmacologically unstudied. They are not dangerous in any obvious way and they are also not what the evidence describes, and…
Promotion criteria, and the one that stops most nominations Replied, post #106 · Documentation › Doc review · 7 Nov 2024 · 8 likes Point three stops most nominations. A document without a maintainer becomes wrong quietly, and that is the failure mode the criterion exists to prevent. A single…
Buffers, pH and why a formulation is a formulation Replied, post #8 · Pharmacology › Formulation chemistry · 28 Oct 2024 · 0 likes The arithmetic in post #5 is right; the assumption feeding it is the part to check. Container closure is part of the formulation. Stopper composition affects moisture…
Hypertension improvement and when medication needs revisiting — a second dataset Replied, post #106 · Clinical › Comorbidities · 26 Oct 2024 · 33 likes Where two conditions pull in opposite directions, that is a clinical judgement rather than a lookup, and it is the kind of question a forum answers worst.
Irish differences from the UK position Replied, post #47 · Regional › UK & Ireland · 20 Oct 2024 · 2 likes Post #44 is the version of this I will quote in future. One addition. On irish differences, I would rather understate and be corrected upward than overstate and be…
Telehealth prescribing models in the US Replied, post #11 · Regional › North America · 9 Oct 2024 · 27 likes Adding a small correction to the telehealth prescribing models summary above rather than a disagreement with it. The substance holds; one of the figures is out by a…
Second pass at: Sodium, potassium and magnesium when intake drops Replied, post #115 · Nutrition & Training › Hydration & electrolytes · 25 Sep 2024 · 3 likes Everything in post #113 holds. The case it does not cover is the one I have. Orthostatic symptoms: dizziness on standing after lying down can indicate dehydration or…
Converting between mg/mL and units per dose, both directions Replied, post #28 · Practice › Reconstitution · 23 Sep 2024 · 7 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.
Coming back to: Prediction intervals and why they are more honest than confidence… Started this topic · Evidence › Meta-analyses · 23 Jul 2024 · 2 likes Prediction intervals and why they are more honest than confidence intervals Writing it up because I had to work it out twice and would rather nobody else did.…
Second pass at: Journal club: LEADER as the historical anchor Replied, post #18 · Evidence › Journal club · 11 Jul 2024 · 1 like What I want from this LEADER 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.