s.duarte

TL2 Moderator · Faro

Contributes reviews on supplier material. Based in Faro.

Joined 30 March 2025 · last posted 1d

85 posts, newest first. Showing up to 150.

About the Shortages category Replied, post #8 · Access › Shortages · 26 Jul 2026 · 0 likes Compounding during shortages: some jurisdictions allow pharmacy compounding when a marketed product is in shortage. That permission is jurisdiction-specific and…
Immortal time bias in a claims-database study — one year on Replied, post #44 · Evidence › Study critique · 25 Jul 2026 · 19 likes I read post #42 twice before replying, because I had assumed the opposite. Bias towards the null and bias away from the null: different criticisms have different…
Why retatrutide discussion here is more cautious than elsewhere — one year on Replied, post #90 · Compounds › Retatrutide · 24 Jul 2026 · 0 likes Retatrutide is investigational. Anything obtained outside a trial is by definition research-use-only material with no human-use authorisation. This site will state that…
[2026 update] Travelling with an injectable: documentation and practicalities Replied, post #100 · Access › International · 22 Jul 2026 · 2 likes Compounding in different countries: some countries allow pharmacy compounding under defined conditions; others do not. The rules are jurisdiction-specific and change.
What to include when your question involves a chromatogram — one year on Replied, post #76 · Start Here › How to Ask · 14 Jul 2026 · 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…
Osteoarthritis and mechanical versus metabolic improvement — one year on Replied, post #11 · Clinical › Comorbidities · 9 Jul 2026 · 30 likes Type 2 diabetes: the population with the largest evidence base for these compounds. The SURPASS and SUSTAIN programmes established glycaemic benefit. The renal and…
Sleep apnoea improving and the equipment implications Replied, post #5 · Wellbeing › Sleep · 12 Jun 2026 · 0 likes Sleep apnoea improvement: as weight is lost, sleep apnoea usually improves. The timeframe is weeks to months, not immediate. Improvement often is gradual rather than…
Preservatives: function, testing, and limits — one year on Replied, post #22 · Pharmacology › Formulation chemistry · 7 Jun 2026 · 0 likes Excipients and their purposes: mannitol, sucrose, or other sugars in lyophilised formulations protect the peptide during drying and storage. They are not impurities;…
Tracking a shortage from primary sources rather than rumour Replied, post #39 · Access › Shortages · 6 Jun 2026 · 9 likes Compounding during shortages: some jurisdictions allow pharmacy compounding when a marketed product is in shortage. That permission is jurisdiction-specific and…
Comparing prices across jurisdictions without misleading yourself Replied, post #20 · Access › Pricing · 30 May 2026 · 0 likes Compute cost per delivered dose at your dose if you want a number you can act on. That requires knowing your dose, vial volume, and whether you are using a vial or a pen.
Why fasting instructions for oral semaglutide are not optional advice Replied, post #8 · Compounds › Oral incretins · 19 May 2026 · 3 likes Picking up post #5: that is the part I would want checked first. The SOUL trial: cardiovascular outcomes trial for oral semaglutide in people with type 2 diabetes and…
Semaglutide and gastric emptying — the mechanism behind most of the side-effect profile Replied, post #32 · Compounds › Semaglutide · 19 May 2026 · 0 likes post #31 is right about the mechanism and I think understates the practical bit. Albumin binding is not a unique structural feature and nothing in the class lacks it,…
[2026 update] Storing lyophilised material long term: what governs the shelf life Replied, post #115 · Practice › Storage & stability · 13 May 2026 · 0 likes Published stability data applies specifically to the formulation studied, under the specific conditions stated. It does not automatically transfer to something…
[2026 update] 0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Replied, post #111 · Devices › Syringes & needles · 12 May 2026 · 24 likes Dead volume: residual liquid in the hub and needle after withdrawal. Typical residual is 0.01 to 0.02 mL for an insulin syringe with a fixed needle. Accounting for it…
Whether an aggregate is worth publishing at all: a disputed topic — does this still hold? Replied, post #17 · Data & Tools › Datasets · 8 May 2026 · 0 likes For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.
Coming back to: A structured critique template this community uses Replied, post #6 · Evidence › Study critique · 4 May 2026 · 0 likes When you change your mind: if a reply convinces you that your criticism was not well-founded, say so plainly. The critique might still be real but smaller than you…
Journal club: LEADER as the historical anchor Replied, post #69 · Evidence › Journal club · 4 May 2026 · 3 likes SURMOUNT-OSA (N Engl J Med 2024): Tirzepatide in obstructive sleep apnoea, using an objective physiological endpoint. Notable because soft endpoints are avoided. Two…
Fasting versus non-fasting and which tests care Replied, post #22 · Clinical › Bloodwork · 3 May 2026 · 0 likes post #21 is right about the mechanism and I think understates the practical bit. Liver enzymes: elevation does not specify cause. ALT and AST can rise from many things.…
Revisiting: What pooling buys you and what it destroys Replied, post #11 · Evidence › Meta-analyses · 2 May 2026 · 15 likes Two things before anyone answers the substance. First, the context in the first post is clear and specific. Second, the question is framed so that an answer can…
Reflectance and photometric devices: precision in practice — a second dataset Replied, post #10 · Analytics › Home & field testing · 13 Apr 2026 · 33 likes Precision of home tests: most consumer-accessible devices are not precise to the level people want ("is this 99% pure or 97% pure"). They give a yes/no or a rough…
Type 2 diabetes and the largest part of the evidence base — does this still hold? Replied, post #4 · Clinical › Comorbidities · 12 Apr 2026 · 12 likes Comorbidity control: if a comorbidity (high blood pressure, high lipids) is not adequately controlled, the decision about adding compounds in this class depends on the…
Bug report: the reconstitution calculator and a rounding edge case Replied, post #46 · Data & Tools › Calculators · 7 Apr 2026 · 7 likes Offline use: all calculators are written in JavaScript and can be downloaded and run offline if desired. They do not require internet connectivity to function.
Follow-up: State-level differences that actually matter Replied, post #38 · Regional › North America · 6 Apr 2026 · 3 likes Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing. The correction was fair and I had…
Coming back to: Semaglutide in people without diabetes: what the evidence base looks like Replied, post #45 · Compounds › Semaglutide · 30 Mar 2026 · 1 like The STEP programme populations were selected: enrollment criteria required baseline body mass index over 30, no recent blood pressure crisis, no recent retinopathy, no…
Grapefruit: why this class is not the class that cares Replied, post #39 · Practice › Interactions · 14 Mar 2026 · 8 likes Picking up post #36: that is the part I would want checked first. Oral medications versus time: if you take an oral medication 30 minutes before semaglutide (which…
Reading U-100 graduations, with a conversion table Replied, post #13 · Devices › Syringes & needles · 24 Feb 2026 · 9 likes Reading units correctly: look at the marking from the side, not from above or below. The bottom of the plunger tip is the reading. Parallax error (wrong angle) is a…
Coming back to: Reading a supplier's product description as a marketing document Replied, post #35 · Compounds › Other compounds · 24 Feb 2026 · 10 likes When "no data" is the complete and final answer: if there is no published human data on a compound, that is the state of knowledge. Hope is not a substitute and…
Publication bias detection and its low power — does this still hold? Replied, post #12 · Evidence › Meta-analyses · 15 Feb 2026 · 0 likes Fixed-effects versus random-effects models: fixed-effects assumes all studies are estimating the same thing and variation is sampling error. Random-effects assumes…
Shoulders, tangent skims, and defensible integration — the long version Replied, post #12 · Analytics › HPLC & UHPLC · 11 Feb 2026 · 5 likes Worth separating two things that post #8 runs together. Two things before anyone answers the substance. First, the context in the first post is clear and specific.…
Stepping down deliberately, and how to do it without losing progress Replied, post #55 · Practice › Dosing & titration · 8 Feb 2026 · 11 likes Dose equivalence between different incretin analogues is a weak concept. The molecules differ in structure, half-life, receptor selectivity, and in what has been…
Storing lyophilised material long term: what governs the shelf life Replied, post #35 · Practice › Storage & stability · 22 Jan 2026 · 15 likes I read post #33 twice before replying, because I had assumed the opposite. Temperature excursions: if a vial sat at room temperature for a time, the question is whether…
Why a compound being unapproved is not the same as being illegal to possess Replied, post #50 · Sourcing › Regulatory · 16 Jan 2026 · 5 likes For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.
Why an oral GLP-1 agonist is a formulation achievement more than a chemistry one Replied, post #126 · Compounds › Oral incretins · 3 Jan 2026 · 0 likes Coming back to post #124, because the follow-up matters more than the original answer. Two things before anyone answers the substance. First, the context in the first…
Coming back to: The SOUL trial and oral semaglutide cardiovascular outcomes Replied, post #80 · Compounds › Oral incretins · 30 Dec 2025 · 4 likes Dose numbers for oral formulations are not comparable to injectable ones. The 14 mg oral dose is not equivalent to any injectable dose in the traditional comparison…
What "marked as solution" means and who gets to mark it — does this still hold? Replied, post #24 · Start Here › Welcome · 25 Dec 2025 · 32 likes Your introduction is well framed. You have given enough context that people can actually answer. That is rarer than it sounds and it matters more than it sounds.
About the Other compounds category Replied, post #4 · Compounds › Other compounds · 18 Dec 2025 · 7 likes Suggestion for the wiki post above: it would be worth linking the two or three most-referenced topics in this category directly, since new members reliably ask for…
The decimal-point error, and the habit that catches it Replied, post #104 · Practice › Reconstitution · 18 Dec 2025 · 26 likes Coming back to post #102, because the follow-up matters more than the original answer. Swirling versus inverting versus leaving it alone: the vial can be gently warmed…
Tracking a preprint to publication: a worked example Replied, post #125 · Evidence › Preprints · 12 Dec 2025 · 19 likes For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.
Tracking that stops updating and then resumes — the long version Replied, post #33 · Sourcing › Logistics · 2 Nov 2025 · 15 likes This follows post #30 rather than contradicting it. Reshipment after seizure: if a parcel is seized, some suppliers will reship; others will not. That is a supplier…
Detection wavelength and why 214 nm and 280 nm disagree Replied, post #71 · Analytics › HPLC & UHPLC · 26 Oct 2025 · 0 likes This is why a purity figure without the underlying chromatogram is weaker evidence than it appears. It is also why two competent laboratories can report different…
What happens after your first post: likes, trust levels, and why none of it matters much… Replied, post #53 · Start Here › Welcome · 17 Oct 2025 · 23 likes Your introduction is well framed. You have given enough context that people can actually answer. That is rarer than it sounds and it matters more than it sounds.
Liver enzymes drifting down and what that usually means Replied, post #18 · Clinical › Bloodwork · 12 Oct 2025 · 7 likes TSH and free hormones: TSH is a reasonable screening test but does not tell you about actual free hormone levels. If TSH is abnormal, free thyroid hormones confirm…
The most useful thing you learned here that was not the answer you came for — a second… Replied, post #80 · Lounge › Off topic · 7 Oct 2025 · 3 likes post #79 answers the question as asked. The question underneath it is different. Adjacent and interesting: you might post something about nutrition, bioavailability…
MHRA statements, read directly Replied, post #9 · Regional › UK & Ireland · 29 Sep 2025 · 0 likes Compounding pharmacies: UK allows compounding under specific conditions when a licensed product is unavailable. That is not a front-line option but becomes relevant…
Compounds this community declines to help with, and why Replied, post #29 · Compounds › Other compounds · 29 Sep 2025 · 0 likes Compounds this community declines to help with, and why: there are specifics in the guidelines and they are not arbitrary. They exist because of failure modes that have…
A payment that went through twice: how it was resolved Replied, post #4 · Sourcing › Payments · 21 Sep 2025 · 5 likes Escrow services: some third-party services hold payment until the buyer confirms receipt. They add cost but reduce risk if the supplier is unknown.
Payment method and the leverage it gives you, ranked Replied, post #26 · Sourcing › Payments · 17 Sep 2025 · 0 likes Currency conversion: payment in your local currency often involves a conversion fee. Paying in the supplier's native currency sometimes saves money, sometimes costs…
Publishing an inconvenient result: a case study Replied, post #69 · Sourcing › Independent verification · 20 Aug 2025 · 0 likes post #68 is right about the mechanism and I think understates the practical bit. Medutest: combined purity and identity reporting. Appears throughout vendor…
Immortal time bias in a claims-database study Replied, post #16 · Evidence › Study critique · 8 Aug 2025 · 0 likes I read post #14 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,…
A ten-fold dose error caught before injection — one year on Replied, post #75 · Devices › Syringes & needles · 3 Aug 2025 · 0 likes Syringe barrel size: common sizes are 0.3 mL, 0.5 mL, and 1.0 mL. Smaller barrels are more legible for small doses. Larger barrels hold larger volumes. Choose based on…
[2026 update] What we do not know about retatrutide, listed explicitly Replied, post #33 · Compounds › Retatrutide · 3 Aug 2025 · 0 likes Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing. The correction was fair and I had…
Which panel is worth repeating and which is worth ignoring Replied, post #74 · Clinical › Bloodwork · 1 Aug 2025 · 3 likes I read post #72 twice before replying, because I had assumed the opposite. Practical note that does not fit anywhere else. Whatever you conclude from this topic, write…
Tracking that stops updating and then resumes Replied, post #14 · Sourcing › Logistics · 31 Jul 2025 · 1 like Picking up post #11: that is the part I would want checked first. Customs holds: if a parcel is held at customs and you can contact customs directly, declaring your…
Revisiting: Reading a denial letter as a specification for your appeal Replied, post #56 · Access › Insurance & coverage · 25 Jul 2025 · 0 likes Picking up post #53: that is the part I would want checked first. Denial letters: the stated reason tells you exactly what to submit next. A denial is not final; it is…
BPC-157: what the rodent literature actually shows, and what it does not — a second… Replied, post #73 · Compounds › Repair & healing peptides · 21 Jul 2025 · 4 likes Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down what you did and when. The single most useful thing in your own…
[2026 update] Constipation management, with a dietitian's contribution Replied, post #8 · Practice › Side effects · 2 Jul 2025 · 0 likes Gallbladder complications: rapid weight loss increases the risk of gallstone formation. The mechanism is not specific to this drug class. The risk is greatest in the…
Regression to the mean in progress reports Replied, post #27 · Research Methods › Statistics · 1 Jul 2025 · 0 likes Confidence intervals: rather than a single point estimate, a range of plausible values. A narrow interval means precise measurement; a wide interval means measurement…
Journal club: the CagriSema phase 2 combination paper — a second dataset Replied, post #60 · Evidence › Journal club · 30 Jun 2025 · 0 likes I read post #58 twice before replying, because I had assumed the opposite. Having read the exchange above, I think I was wrong earlier in this topic and I want to say…
Domestic fridge temperature mapping: a cheap experiment — what changed since Replied, post #132 · Devices › Cold chain · 29 Jun 2025 · 5 likes Shipping container and cold packs: reputable suppliers use insulated containers with cold packs designed to arrive cool. Checking on arrival that cold packs are still…
Promotion criteria, and the one that stops most nominations — the long version Replied, post #15 · Documentation › Doc review · 20 Jun 2025 · 1 like Revision disputes: if you disagree with an edit a maintainer made to a page, discuss it here. The goal is accuracy and clarity, not authorship.
A report I filed that turned out to be wrong, and the correction Replied, post #106 · Sourcing › Vendor reports · 16 Jun 2025 · 31 likes Two things before anyone answers the substance. First, the context in the first post is clear and specific. Second, the question is framed so that an answer can…
An emergency department visit, described afterwards Replied, post #23 · Safety › Adverse events · 22 May 2025 · 5 likes Coming back to post #21, because the follow-up matters more than the original answer. Severe gastrointestinal events: persistent vomiting, abdominal pain out of…
Albumin binding and how it produces a long half-life Replied, post #32 · Pharmacology › Pharmacokinetics · 4 May 2025 · 7 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…
Revisiting: Oral versus injected administration claims for BPC-157 Replied, post #21 · Compounds › Repair & healing peptides · 20 Apr 2025 · 1 like I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The distinction being drawn does not survive when you look at…
Second pass at: Retatrutide mass and identity: what a report should show Replied, post #24 · Compounds › Retatrutide · 18 Apr 2025 · 28 likes For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.
Second pass at: Triple agonism: additive, synergistic, or neither? Replied, post #39 · Compounds › Retatrutide · 18 Apr 2025 · 0 likes Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing. The correction was fair and I had…
Second pass at: Pen dose counters: what a click does and does not guarantee Replied, post #16 · Devices › Pens & autoinjectors · 11 Apr 2025 · 13 likes Visibility of the dose: some pens allow you to see the insulin remaining; others do not. Keeping track using the dose counter is important if visibility is limited.
When a preprint is the best available evidence and we say so — a second dataset Replied, post #16 · Evidence › Preprints · 14 Mar 2025 · 0 likes Worth separating two things that post #12 runs together. Two things before anyone answers the substance. First, the context in the first post is clear and specific.…
Counter-ion form: the field almost nobody reports — one year on Replied, post #18 · Analytics › COA interpretation · 22 Feb 2025 · 21 likes This follows post #15 rather than contradicting it. Reading old certificates: if a certificate is dated years ago, the lot it describes might be old. That is not…
Second pass at: Regression to the mean in progress reports Replied, post #35 · Research Methods › Statistics · 25 Jan 2025 · 4 likes Number needed to treat: how many people need to be treated to prevent one bad outcome or achieve one good outcome. More intuitive than relative risk reduction.
Albumin binding and how it produces a long half-life Started this topic · Pharmacology › Pharmacokinetics · 20 Jan 2025 · 0 likes Albumin binding and how it produces a long half-life — setting out what I have, and where I think it stops being reliable. I would like to understand what this number…
Transit times by route, from a logged dataset — the long version Replied, post #50 · Sourcing › Logistics · 17 Jan 2025 · 0 likes Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing. The correction was fair and I had…
Triple agonism: additive, synergistic, or neither? Replied, post #7 · Compounds › Retatrutide · 30 Dec 2024 · 1 like Dose escalation in the published trials: the protocols started at lower doses and escalated by defined steps. The step sizes are documented and they may or may not…
Transporting a vial for a weekend away Replied, post #22 · Practice › Storage & stability · 1 Nov 2024 · 4 likes Published stability data applies specifically to the formulation studied, under the specific conditions stated. It does not automatically transfer to something…
Irish differences from the UK position Replied, post #62 · Regional › UK & Ireland · 28 Oct 2024 · 0 likes I read post #60 twice before replying, because I had assumed the opposite. Supply and shortage resilience: both UK and Ireland sourced primarily from European suppliers…
Second pass at: Buffers, pH and why a formulation is a formulation Replied, post #12 · Pharmacology › Formulation chemistry · 23 Oct 2024 · 4 likes Worth separating two things that post #8 runs together. Preservatives: solutions for multi-dose vials contain preservatives (benzyl alcohol, phenol, or others) to…
Semaglutide half-life: where the 165 to 184 hour figure comes from — what changed since Replied, post #21 · Compounds › Semaglutide · 6 Oct 2024 · 18 likes For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.
Revisiting: How to bring a laboratory report to an appointment usefully Replied, post #82 · Clinical › Bloodwork · 5 Oct 2024 · 18 likes post #81 answers the question as asked. The question underneath it is different. Renal function markers: eGFR is estimated, not measured. It depends on creatinine, age,…
Second pass at: Sodium, potassium and magnesium when intake drops Replied, post #121 · Nutrition & Training › Hydration & electrolytes · 28 Sep 2024 · 6 likes This follows post #118 rather than contradicting it. Constipation and hydration: dehydration makes constipation worse. Increasing fluid intake is the first intervention…
Converting between mg/mL and units per dose, both directions Replied, post #32 · Practice › Reconstitution · 27 Sep 2024 · 6 likes post #31 answers the question as asked. The question underneath it is different. Swirling versus inverting versus leaving it alone: the vial can be gently warmed (hands…
Revisiting: A staff appointment, and what the role involves Replied, post #2 · Meta › Announcements · 14 Sep 2024 · 0 likes Archives: older announcements are archived by date. Checking archives is useful if you want to know what changed when.
Guidelines revision: what changed and why Replied, post #124 · Meta › Announcements · 28 Jul 2024 · 13 likes On post #120 — agreed on the reasoning, with one qualification. Staff-only posts: some announcements are visible only to staff (concerning internal operations). Members…
The mass-error checker and its intended scope Replied, post #159 · Data & Tools › Calculators · 27 Jul 2024 · 15 likes Titration planning: a calculator that shows you the escalation schedule for different starting and ending doses can help you visualize your path. Actual path might be…
Oral contraceptives and delayed emptying: what the data shows Replied, post #30 · Practice › Interactions · 11 Jul 2024 · 15 likes Two things before anyone answers the substance. First, the context in the first post is clear and specific. Second, the question is framed so that an answer can…
Spreadsheets: an appreciation Replied, post #21 · Lounge › Off topic · 8 Jun 2024 · 4 likes Science communication: if you come across an interesting science paper or article about peptides or metabolism, sharing it and discussing the idea is on-topic.