i.guerrero

TL2 · Lagos

Contributes reviews on supplier material. Based in Lagos.

Joined 18 April 2025 · last posted 9h

76 posts, newest first. Showing up to 150.

Adolescents: a distinct evidence base Replied, post #4 · Clinical › Special populations · 28 Jul 2026 · 25 likes Adolescent evidence exists for some compounds in this class and is a separate approval decision with its own trials rather than an extension of the adult data.
Reading a home test result without over-claiming Replied, post #137 · Analytics › Home & field testing · 27 Jul 2026 · 12 likes Where a home observation and an independent result disagree, the independent one is measuring something more specific. That does not make the home observation useless —…
What is genuinely unknown about long-term amylin agonism Replied, post #72 · Compounds › Cagrilintide & amylin analogues · 22 Jul 2026 · 2 likes That is clearer than the version I had in my head. Thank you.
Coming back to: Why a preprint's supplementary material is often the best part Replied, post #89 · Evidence › Preprints · 26 Jun 2026 · 5 likes Confirming post #88 from a second method, which matters more than confirming it from a second person. A preprint with the data and code attached is frequently more…
A critique that turned out to be unfair, retracted by its author Replied, post #17 · Evidence › Study critique · 23 Jun 2026 · 0 likes On critique the community has more anecdote than the confidence in this thread implies, and I include my own contribution in that.
Primary endpoint hierarchies and why order matters — one year on Replied, post #20 · Evidence › Trials · 19 Jun 2026 · 1 like Building on post #19 rather than restating it. Absolute and relative effects answer different questions. Write down the event rate in each arm and the difference…
Injecting into an area that has become firm: why not to Replied, post #73 · Practice › Administration · 14 Jun 2026 · 7 likes Post #72 answers the question as asked. The question underneath it is different. If you have to inject at a different time of day than usual, that is a much smaller…
Coming back to: Time to steady state after a dose increase Replied, post #64 · Pharmacology › Pharmacokinetics · 29 May 2026 · 10 likes Renal clearance: these compounds are cleared partly via the kidney. In severe renal impairment, clearance is slowed and accumulation risk is higher. Dose adjustments…
Fasting versus non-fasting and which tests care Replied, post #34 · Clinical › Bloodwork · 23 May 2026 · 0 likes A request rather than an answer: could whoever has the primary source for fasting versus non-fasting post it? I have seen the claim three times this month and each…
A payment that went through twice: how it was resolved Replied, post #25 · Sourcing › Payments · 23 Apr 2026 · 3 likes Order confirmations that state the lot to be shipped are rare and are the single most useful thing a supplier can put on one.
Anaesthesia and elective surgery: the aspiration question Replied, post #89 · Practice › Interactions · 17 Apr 2026 · 31 likes Appreciated. The plain phrasing does more work here than a longer post would.
[2026 update] Does a peptide degrade silently, with no visual change? Replied, post #42 · Practice › Storage & stability · 3 Apr 2026 · 24 likes I had written a reply contradicting post #38 and deleted it. Here is what survived. What I want from this peptide thread is the list of things that would need to be…
The lowest dose that does anything: is that a real question? Replied, post #89 · Practice › Dosing & titration · 7 Mar 2026 · 30 likes Second-hand on lowest dose, so weight it accordingly — someone whose method I trust told me this and I have not verified it myself.
Second pass at: Fasting versus non-fasting and which tests care Replied, post #12 · Clinical › Bloodwork · 8 Feb 2026 · 0 likes Two things can be true about Fasting versus non-fasting at once: the mechanism is plausible and the evidence for the size of the effect is thin. Most of the argument…
Storing lyophilised material long term: what governs the shelf life Replied, post #53 · Practice › Storage & stability · 5 Feb 2026 · 12 likes Reconstituted material carried in a bag for a day is a temperature excursion even in a cool climate. Where that matters is cumulative exposure over weeks rather than a…
Coming back to: Reading a supplier's product description as a marketing document Replied, post #13 · Compounds › Other compounds · 3 Feb 2026 · 0 likes Sequence verification: for an obscure compound, a report of the amino acid sequence or a mass-spectrometry result confirming the mass is the only verification that…
Can a home kit substitute for a laboratory report? A careful no Replied, post #114 · Analytics › Home & field testing · 23 Jan 2026 · 0 likes Why third-party testing is stronger: a home test run by the person who made the compound is a self-selected result. The test run by a neutral third party removes…
Temperature loggers worth the money — the long version Replied, post #113 · Devices › Cold chain · 15 Jan 2026 · 22 likes The practical version of Temperature loggers worth the money is three sentences long. The rigorous version is three pages and reaches the same conclusion with the…
Reconstitution volumes that produce round numbers, tabulated Replied, post #21 · Practice › Reconstitution · 7 Jan 2026 · 0 likes The claim about reconstitution volumes upthread is stronger than its source supports. I have read the source. The source says "associated with" and the post says…
Lean mass preservation: what the evidence supports — does this still hold? Replied, post #9 · Outcomes › Body composition · 3 Jan 2026 · 0 likes Lean mass loss during rapid weight reduction: depends on protein intake, resistance training volume, and total energy deficit. Adequate protein and maintaining training…
A history of disordered eating: proceeding carefully Replied, post #31 · Wellbeing › Mental health · 17 Dec 2025 · 5 likes A definition problem is doing most of the work in this history of disordered eating discussion. Once the term is pinned down I suspect the disagreement mostly goes away…
The decimal-point error, and the habit that catches it Replied, post #53 · Practice › Reconstitution · 16 Dec 2025 · 0 likes On decimal-point error: the maintained page in the documentation commons covers the general case with citations and a review date, which is more reliable than any reply…
[2026 update] Publication patterns in the BPC-157 literature, examined Started this topic · Compounds › Repair & healing peptides · 14 Dec 2025 · 5 likes Publication patterns in the BPC-157 literature, examined Writing it up because I had to work it out twice and would rather nobody else did. Putting the numbers in the…
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly — the long… Replied, post #90 · Compounds › Tirzepatide · 13 Dec 2025 · 0 likes Tirzepatide in type 2 diabetes is well covered in the tag pages, and the older discussions are better than the recent ones because they were argued out properly. Worth…
Why tirzepatide titration schedules have more steps than semaglutide's Started this topic · Compounds › Tirzepatide · 29 Nov 2025 · 0 likes Asking directly, because I could not find a straight answer: Why tirzepatide titration schedules have more steps than semaglutide's I have spent a fortnight trying to…
Sequence verification for an obscure compound: how it is done — what changed since Replied, post #99 · Compounds › Other compounds · 26 Nov 2025 · 0 likes Anyone submitting an unusual compound for testing should tell the laboratory what it is rather than what it is sold as. Method selection depends on the structure and…
The headache that turns out to be dehydration Replied, post #43 · Nutrition & Training › Hydration & electrolytes · 2 Nov 2025 · 0 likes I keep a log for headache specifically because my memory of it turned out to be systematically wrong in one direction. Six weeks of notes cost nothing and settled it.
Request: export my own posts — one year on Replied, post #5 · Meta › Feature requests · 20 Oct 2025 · 25 likes Worth separating two things that post #3 runs together. Request with the use case rather than the feature. I frequently want every topic that cites a particular…
Insomnia at a dose step: reported experiences Replied, post #18 · Wellbeing › Sleep · 18 Oct 2025 · 0 likes Post #15 is the version of this I will quote in future. One addition. Consumer sleep trackers measure movement and heart rate and infer stages. The inference is…
Adolescents: a distinct evidence base — one year on Replied, post #25 · Clinical › Special populations · 16 Oct 2025 · 1 like Being outside the studied population does not mean a treatment is unsafe. It means the usual evidence is not available and the reasoning has to be explicit. I would…
Coming back to: Why quantitation is the hard part, not detection Replied, post #77 · Analytics › Home & field testing · 11 Oct 2025 · 0 likes Small methodological point on quantitation: repeating a measurement is cheap and resolves most of what is being argued about here at no cost to anyone.
Why "any advice?" is the least effective ending for a post — the long version Replied, post #57 · Start Here › How to Ask · 21 Sep 2025 · 20 likes Arithmetic questions: write out the steps. "I have a 10 mg vial, I added 2 mL, I want a 0.25 mg dose, and I get this number for the syringe mark" is answerable. "How…
Fatigue in the first month: how much is the drug and how much is intake — what changed… Replied, post #71 · Practice › Side effects · 4 Sep 2025 · 0 likes This is the sort of exchange that makes the archive worth searching.
Are there stupid questions here? A staff answer, at length Replied, post #147 · Start Here › Welcome · 3 Sep 2025 · 4 likes Nothing here requires expertise. The experienced members here got that way by posting questions, not by knowing the answer before they showed up. If you know something…
Temperature loggers worth the money — the long version Replied, post #32 · Devices › Cold chain · 29 Aug 2025 · 6 likes Two claims get bundled together under Temperature loggers worth the money and they need separating. The descriptive one — this is what was observed — is usually well…
Washout: how long is long enough, and for what purpose Replied, post #60 · Pharmacology › Pharmacokinetics · 27 Aug 2025 · 5 likes Answering the question post #58 raises rather than the one it answers. The question underneath washout is usually "how would I tell?" rather than "what is true?", and…
The "under review" status pill and when a moderator applies it — a second dataset Replied, post #54 · Evidence › Preprints · 27 Aug 2025 · 30 likes Post #52 describes the usual case. This is about the unusual one. Peer review as a filter: published papers have survived a review process that rejects many…
Coming back to: Resolution and tailing factor: real acceptance criteria Replied, post #45 · Analytics › HPLC & UHPLC · 23 Aug 2025 · 0 likes Post #44 is right about the mechanism and I think understates the practical bit. The strongest argument against my own position on Resolution and tailing factor, stated…
Triple agonism: additive, synergistic, or neither? Replied, post #80 · Compounds › Retatrutide · 16 Aug 2025 · 11 likes The useful distinction on triple agonism is between what was measured and what was inferred from it. Both end up in the same sentence and only one of them has error bars.
Revisiting: What to include when your question involves arithmetic Replied, post #26 · Start Here › How to Ask · 21 Jul 2025 · 1 like That is a fair summary of where the discussion has got to.
A field-by-field walk through a certificate of analysis Replied, post #120 · Analytics › COA interpretation · 17 Jul 2025 · 23 likes A certificate is a statement by its issuer that a defined test was performed on a defined lot and produced a defined result. That is all it is, and it is not nothing. I…
Detection wavelength and why 214 nm and 280 nm disagree Replied, post #14 · Analytics › HPLC & UHPLC · 3 Jul 2025 · 16 likes This follows post #12 rather than contradicting it. Detection at 214 nanometres sees the peptide bond and therefore sees almost everything peptidic. At 280 it sees…
Revisiting: Food effects on oral incretin absorption: what is documented Replied, post #2 · Compounds › Oral incretins · 30 Jun 2025 · 15 likes The opening post answers the question as asked. The question underneath it is different. The thirty-minute wait before eating is not conservatism. Food in the stomach…
Titles that describe the question, not the situation Replied, post #32 · Start Here › How to Ask · 20 Jun 2025 · 31 likes On titles the community has more anecdote than the confidence in this thread implies, and I include my own contribution in that.
[2026 update] An appeal that failed, and what I would do differently Replied, post #112 · Access › Insurance & coverage · 14 Jun 2025 · 6 likes Keep every document with dates in one place. An appeal months later is assembled from whatever you kept.
A well-designed study with a badly written abstract Replied, post #109 · Evidence › Study critique · 27 May 2025 · 25 likes I had written a reply contradicting post #105 and deleted it. Here is what survived. Generalisability: do the inclusion/exclusion criteria narrow the population so much…
Reading an MS report that only gives you a single number Replied, post #87 · Analytics › Mass spectrometry · 23 May 2025 · 2 likes Adding the measurement that post #86 says would settle it. Positional isomers and epimers are mass-identical. Any argument that a mass result rules them out is wrong,…
Delayed gastric emptying and oral medication absorption: which drugs matter Replied, post #90 · Practice › Interactions · 18 May 2025 · 32 likes Post #87 and I disagree about the size of the effect, not about the direction. Vitamins: most vitamins have no significant interaction. Fat-soluble vitamins (A, D, E,…
A well-designed study with a badly written abstract Replied, post #45 · Evidence › Study critique · 26 Apr 2025 · 24 likes Two claims get bundled together under well-designed study and they need separating. The descriptive one — this is what was observed — is usually well supported. The…
Second pass at: Gauge and length selection for subcutaneous injection Replied, post #54 · Devices › Syringes & needles · 13 Apr 2025 · 10 likes Sharps containers are a legal requirement for disposal in several jurisdictions and a sensible precaution everywhere. A rigid sealed container is the minimum. Small…
Airline travel with a temperature-sensitive injectable — what changed since Replied, post #11 · Devices › Cold chain · 24 Mar 2025 · 31 likes An update on my earlier Airline travel post: the pattern held for another six weeks and then stopped, which I did not predict and cannot explain.
Adjudicated events and why the definition matters — the long version Replied, post #48 · Evidence › Trials · 15 Mar 2025 · 0 likes My experience of Adjudicated events contradicts the reply above. I am posting it as a data point rather than as a refutation, because one person's experience is exactly…
Requesting a page: what makes a good request Replied, post #19 · Documentation › Wiki requests · 10 Mar 2025 · 0 likes A request that says what the page should not cover is unusually helpful, because scope creep is what kills these.
Revisiting: Oral versus injected administration claims for BPC-157 Started this topic · Compounds › Repair & healing peptides · 26 Feb 2025 · 55 likes On the subject in the title: Revisiting: Oral versus injected administration claims for BPC-157 Working notes rather than a conclusion. A follow-up question about Oral…
Second pass at: Cross-border purchase within the EU: the actual rules Replied, post #60 · Access › International · 23 Feb 2025 · 14 likes Confirming post #57 from a second method, which matters more than confirming it from a second person. Cross-border purchase within was covered in the wiki last year and…
Oxidation and deamidation mass shifts, tabulated Replied, post #59 · Analytics › Mass spectrometry · 22 Feb 2025 · 0 likes Answering the question post #57 raises rather than the one it answers. Deamidation adds approximately one dalton and produces a species that frequently elutes very…
[2026 update] What the GIP component of tirzepatide is thought to contribute, and how… Replied, post #11 · Compounds › Tirzepatide · 7 Feb 2025 · 2 likes I will take the caveat as seriously as the claim, which is the point of putting it there.
BPC-157: what the rodent literature actually shows, and what it does not — a second… Replied, post #12 · Compounds › Repair & healing peptides · 6 Feb 2025 · 16 likes I would keep BPC-157 and the decision it usually gets used for separate in this thread. They are related and they are not the same question, and merging them is why the…
Distinguishing a deletion sequence by mass alone Replied, post #54 · Analytics › Mass spectrometry · 5 Feb 2025 · 1 like Trifluoroacetate adducts are common in material purified with TFA and are one reason a mass spectrum from a peptide can look busier than expected. The variance between…
Biased agonism: a real phenomenon, an over-used explanation — what changed since Replied, post #38 · Pharmacology › Receptor biology · 30 Jan 2025 · 4 likes Glucose dependence is the property that distinguishes incretin-mediated insulin secretion from a sulfonylurea. It is also why hypoglycaemia risk from these compounds…
Fixed versus detachable needles: the trade-offs Replied, post #97 · Devices › Syringes & needles · 7 Jan 2025 · 0 likes I read post #93 twice before replying, because I had assumed the opposite. Trying to state the fixed versus detachable needles position in a way that someone who…
Revisiting: Bug report: the reconstitution calculator and a rounding edge case Replied, post #36 · Data & Tools › Calculators · 31 Dec 2024 · 26 likes Answering the question post #32 raises rather than the one it answers. Mass error checking: enter your observed mass and theoretical mass and check whether the…
Research-use-only status: what it means legally and practically — a second dataset Replied, post #47 · Compounds › Other compounds · 24 Dec 2024 · 4 likes Clear enough that I do not think I have a follow-up, which is unusual.
Swirling versus inverting versus leaving it alone Started this topic · Practice › Reconstitution · 22 Dec 2024 · 0 likes On the subject in the title: Swirling versus inverting versus leaving it alone Working notes rather than a conclusion. Asking about swirling versus inverting versus…
Why I ask for the gradient before I discuss the number Replied, post #37 · Analytics › HPLC & UHPLC · 19 Nov 2024 · 0 likes I will take the caveat as seriously as the claim, which is the point of putting it there.
Promotion criteria, and the one that stops most nominations Replied, post #102 · Documentation › Doc review · 2 Nov 2024 · 4 likes Post #100 describes the usual case. This is about the unusual one. Two claims get bundled together under promotion criteria and they need separating. The descriptive…
Hypertension improvement and when medication needs revisiting — a second dataset Replied, post #102 · Clinical › Comorbidities · 25 Oct 2024 · 25 likes Where I would push back on the Hypertension improvement consensus is the confidence, not the direction. The direction looks right. The confidence is borrowed.
Irish differences from the UK position Replied, post #43 · Regional › UK & Ireland · 17 Oct 2024 · 0 likes Building on post #40 rather than restating it. What I would check first on irish differences is whether the thing being measured moved or whether the way of measuring…
Why pulsatile secretion matters for interpreting secretagogue claims — a second dataset Replied, post #12 · Compounds › Secretagogues & GH axis · 25 Sep 2024 · 18 likes On post #10 — agreed on the reasoning, with one qualification. I keep a log for pulsatile secretion specifically because my memory of it turned out to be systematically…
Second pass at: Sodium, potassium and magnesium when intake drops Replied, post #111 · Nutrition & Training › Hydration & electrolytes · 23 Sep 2024 · 1 like Exercise and electrolyte losses: sweating during exercise increases sodium and potassium losses. Electrolyte replacement during or after intense exercise helps maintain…
Converting between mg/mL and units per dose, both directions Replied, post #24 · Practice › Reconstitution · 19 Sep 2024 · 11 likes Everything in post #20 holds. The case it does not cover is the one I have. Do not shake. Swirl, or leave it. Vigorous agitation introduces air and shear, and neither…
Progressive overload when the scale is falling — one year on Replied, post #32 · Nutrition & Training › Resistance training · 6 Sep 2024 · 16 likes On post #30 — agreed on the reasoning, with one qualification. I would put moderate confidence on the mainstream reading of Progressive overload and no more. That is…
Follow-up: Where the four-week escalation interval comes from, and what it is not Replied, post #55 · Practice › Dosing & titration · 1 Sep 2024 · 12 likes Adding thanks rather than a view. I do not have a view worth the space.
Guidelines revision: what changed and why Replied, post #101 · Meta › Announcements · 28 Jul 2024 · 1 like The rare case here is the one that costs somebody a week, though, and the common case costs everyone ten seconds. I think the trade is clearly correct. It is the kind…
Second pass at: Journal club: LEADER as the historical anchor Replied, post #14 · Evidence › Journal club · 10 Jul 2024 · 0 likes The baseline characteristics table is the single most useful page for the questions that get asked here, because it tells you who the result applies to.
How this community labels and discusses unrefereed work Replied, post #17 · Evidence › Preprints · 13 Jun 2024 · 0 likes Answering the question post #13 raises rather than the one it answers. What I would want before treating community labels as settled: the method, the sample, and…