ro.frisk

TL2 · Rosario

Contributes reviews on supplier material. Based in Rosario.

Joined 29 January 2025 · last posted 22h

97 posts, newest first. Showing up to 150.

Review: a draft on reconstitution arithmetic, with objections — what changed since Replied, post #51 · Documentation › Doc review · 27 Jul 2026 · 5 likes Thank you — that answers what I came here to find out.
BPC-157: what the rodent literature actually shows, and what it does not — does this… Replied, post #11 · Compounds › Repair & healing peptides · 27 Jul 2026 · 26 likes Nobody has said the unglamorous part of BPC-157 yet, so: most of the variation is explained by things that are boring to write about and easy to check.
eGFR fluctuation and the creatinine denominator problem — the long version Replied, post #32 · Clinical › Bloodwork · 24 Jul 2026 · 0 likes An honest declaration on egfr fluctuation: I have a prior here and it is strong enough that you should weight what I say downward. Stating it rather than hiding it.
Tracking intake honestly when appetite is absent Replied, post #111 · Nutrition & Training › Protein & intake · 23 Jul 2026 · 31 likes Post #110 is right about the mechanism and I think understates the practical bit. Meeting protein targets on suppressed appetite: this is where the practical difficulty…
Why the Start Here categories exist, and what they are not for Replied, post #24 · Start Here › Welcome · 22 Jul 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…
Pooling trials with different estimands Replied, post #116 · Evidence › Meta-analyses · 21 Jul 2026 · 9 likes Study quality and weighting: some meta-analyses weight all studies equally; others weight by study size or study quality. The choice affects the result and should be…
A 5 mg vial and a 0.25 mg dose: the arithmetic in full Replied, post #133 · Practice › Reconstitution · 20 Jul 2026 · 0 likes Post #131 put the caveat in the right place and I want to underline it. Arithmetic step by step: a 5 mg vial with 2 mL of diluent gives (5 mg) / (2 mL) = 2.5 mg/mL. On…
Named, unnamed and unspecified impurities as regulatory categories — the long version Replied, post #86 · Analytics › Impurities & related substances · 17 Jul 2026 · 11 likes The arithmetic in post #85 is right; the assumption feeding it is the part to check. Peptide impurities that differ by a single residue are the hardest to resolve and…
Follow-up: Prior authorisation: what the criteria usually require Replied, post #68 · Access › Insurance & coverage · 11 Jul 2026 · 2 likes Post #66 answers the question as asked. The question underneath it is different. Prior authorisation is worth one more sentence than it usually gets, and the sentence…
Ultrasound and skinfolds: operator dependence in practice Replied, post #50 · Outcomes › Body composition · 9 Jul 2026 · 21 likes Narrowing post #48, because the general version has more than one answer. Worth stating the null on ultrasound and skinfolds before we explain it: the observation may…
Revisiting: Taste changes and food aversion, reported and discussed Replied, post #16 · Practice › Side effects · 8 Jul 2026 · 1 like Hair shedding: telogen effluvium associated with rapid weight loss is reported. The timing usually correlates with the speed of weight change rather than the compound…
Retatrutide mass and identity: what a report should show Replied, post #11 · Compounds › Retatrutide · 6 Jul 2026 · 2 likes Heart rate increased in a dose-dependent way in the phase 2 work. That is not a footnote — it is one of the specific things phase 3 exists to characterise, and it is…
Does dual agonism explain the effect size, or is it dose? Replied, post #45 · Compounds › Tirzepatide · 19 Jun 2026 · 0 likes Quietly grateful for the plain phrasing. Not every thread gets that.
Journal club: STEP 3 and the intensive behavioural therapy floor Replied, post #9 · Evidence › Journal club · 19 May 2026 · 9 likes STEP 1 (N Engl J Med 2021): The pivotal obesity trial for semaglutide and the reference point for most subsequent comparison. Mean weight reduction was substantially…
Common supplements people ask about, assessed one at a time — a second dataset Replied, post #105 · Practice › Interactions · 13 May 2026 · 9 likes I read post #101 twice before replying, because I had assumed the opposite. Timing separation is the standard mitigation where absorption rate is the concern, and the…
Trust level 3 requirements: a clarification — does this still hold? Replied, post #38 · Meta › Announcements · 29 Apr 2026 · 0 likes Offering a way to settle Trust level 3 requirements rather than another opinion about it. Two measurements, taken the same way, a fortnight apart. If the difference is…
Revisiting: PCOS and metabolic overlap: what is and is not studied Replied, post #19 · Clinical › Comorbidities · 22 Apr 2026 · 0 likes Where somebody is on several medicines, the interaction question and the comorbidity question are entangled and both belong with a pharmacist.
Coming back to: Washout: how long is long enough, and for what purpose Replied, post #100 · Pharmacology › Pharmacokinetics · 10 Apr 2026 · 5 likes Building on post #97 rather than restating it. My experience of Washout contradicts the reply above. I am posting it as a data point rather than as a refutation,…
Follow-up: State-level differences that actually matter Replied, post #73 · Regional › North America · 8 Apr 2026 · 28 likes That is a fair summary of where the discussion has got to.
Journal club: STEP 8 and the fairness of the comparator dose — a second dataset Replied, post #4 · Evidence › Journal club · 5 Apr 2026 · 1 like Where the group cannot agree, record the disagreement rather than resolving it by seniority. The recorded disagreement is more honest and more useful later.
Designing a personal experiment that could change your mind — one year on Replied, post #27 · Research Methods › N-of-1 designs · 31 Mar 2026 · 6 likes That reframing is the whole thing. The facts I already had.
What a certificate commits its issuer to — one year on Replied, post #34 · Analytics › COA interpretation · 18 Mar 2026 · 13 likes A chromatogram supplied as a small image is legible for peak shape and not for baseline detail. That is enough to sanity-check an integration and not enough to…
Revisiting: Liver enzymes drifting down and what that usually means Replied, post #10 · Clinical › Bloodwork · 8 Mar 2026 · 0 likes On post #8 — agreed on the reasoning, with one qualification. Time of day: some biomarkers vary across the day. Cortisol in the morning differs from cortisol in the…
Second pass at: Choosing a concentration on purpose rather than by accident Replied, post #35 · Practice › Reconstitution · 8 Mar 2026 · 0 likes Choose the concentration so that a typical dose lands on a graduation you can actually read. A dose that falls between two marks on a 1 mL barrel is a dose you will get…
Second pass at: The topic list is dense — is that deliberate? Replied, post #91 · Meta › Site feedback · 6 Mar 2026 · 2 likes On topic list, the part that usually goes wrong is that the question is asked as though it has one answer. It has a range, and the width of the range is the interesting…
Request: export my own posts — one year on Replied, post #55 · Meta › Feature requests · 6 Mar 2026 · 0 likes Asking for something deliberately narrow: a way to link to a range of posts rather than a single one. Half the good exchanges here are four posts long and there is no…
Which panel is worth repeating and which is worth ignoring — a second dataset Replied, post #91 · Clinical › Bloodwork · 3 Mar 2026 · 17 likes On panel, I would rather understate and be corrected upward than overstate and be quoted. That is a house style here and it is a good one.
Comparing my trajectory with the trial curves, carefully — a second dataset Replied, post #9 · Outcomes › Progress reports · 15 Feb 2026 · 0 likes Seasonal patterns: some people report weight loss is slower in winter than summer. Body composition and activity changes might contribute. Noting the season is useful…
Preprint servers and what screening they do Replied, post #55 · Evidence › Preprints · 14 Feb 2026 · 18 likes Where a preprint's numbers are the basis of a claim being repeated here, someone should check whether the published version exists yet. That check is nearly always…
Mass error in ppm: the arithmetic and the caveat Replied, post #53 · Analytics › Mass spectrometry · 13 Feb 2026 · 12 likes Post #50 is the version of this I will quote in future. One addition. Small methodological point on mass error in ppm: repeating a measurement is cheap and resolves…
Revisiting: Language barriers in accessing a prescription abroad Replied, post #100 · Access › International · 9 Feb 2026 · 25 likes Thank you for taking the time. That was more work than a reply usually is.
Run-in periods and the population they select Replied, post #60 · Evidence › Trials · 2 Feb 2026 · 15 likes This follows post #59 rather than contradicting it. Absolute numbers, not just relative: a 30% relative reduction tells you the ratio but not the practical magnitude.…
Revisiting: A page that has drifted out of date and needs a maintainer Replied, post #66 · Documentation › Wiki requests · 1 Feb 2026 · 9 likes Name a willing maintainer in the request. Point three of the criteria stops more nominations than the other three combined.
[2026 update] Availability by country, dated, with primary sources Replied, post #17 · Access › International · 25 Jan 2026 · 4 likes Where a compound is approved under a different trade name in another market, searching the local name finds documents the English name does not. I would be glad to be…
Pharmacy supply in the UK and the questions you will be asked Replied, post #20 · Regional › UK & Ireland · 25 Jan 2026 · 20 likes Where a member reports a decision, the useful detail is the stated reason rather than the outcome, because the reason is what generalises.
Muscle cramps: the ordinary causes before the exotic ones Replied, post #86 · Practice › Side effects · 20 Jan 2026 · 24 likes This follows post #83 rather than contradicting it. Where I have landed on muscle cramps, having got it wrong once in public: the direction is clear, the magnitude is…
Lean mass preservation: what the evidence supports — does this still hold? Replied, post #15 · Outcomes › Body composition · 18 Jan 2026 · 0 likes Muscle gained during a deficit is possible in specific circumstances and is not the usual case, and the published evidence is clear about which circumstances. I would…
Realistic expectations for strength while losing weight quickly Replied, post #51 · Nutrition & Training › Resistance training · 7 Jan 2026 · 5 likes I had written a reply contradicting post #49 and deleted it. Here is what survived. Strength and hypertrophy respond to different things, and preserving one during a…
Distinguishing expected GI effects from something that needs urgent attention Replied, post #41 · Practice › Side effects · 6 Jan 2026 · 0 likes Coming back to post #39, because the follow-up matters more than the original answer. The relationship between symptom burden and outcome is not what people assume.…
Heterogeneity as information rather than as a nuisance Replied, post #50 · Evidence › Meta-analyses · 5 Jan 2026 · 11 likes Distinguishing three things in the heterogeneity discussion that keep getting used interchangeably: the observation, the proposed mechanism, and the recommendation that…
Receptor desensitisation as a tolerance hypothesis, and its weak evidence — the long… Replied, post #35 · Pharmacology › Receptor biology · 31 Dec 2025 · 29 likes Coming back to post #31, because the follow-up matters more than the original answer. Species differences in receptor pharmacology are substantial in this family, which…
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly — the long… Replied, post #24 · Compounds › Tirzepatide · 3 Dec 2025 · 0 likes Post #22 put the caveat in the right place and I want to underline it. Titration schedules for tirzepatide have more dose steps than semaglutide partly because the…
Revisiting: Aggregates and why a purity assay may miss them entirely Replied, post #42 · Analytics › Impurities & related substances · 22 Nov 2025 · 5 likes I think the Aggregates question is answerable and has not been answered, which is a more optimistic position than most of this thread.
[2026 update] How much of the diluent volume the powder itself displaces Replied, post #4 · Practice › Reconstitution · 22 Nov 2025 · 4 likes On a U-100 insulin syringe, one hundred units is one millilitre and one unit is 0.01 millilitres. Units are volume marks. They mean nothing until you know the…
[2026 update] What steady state means for the decision to escalate Replied, post #127 · Practice › Dosing & titration · 18 Nov 2025 · 0 likes The four-week escalation interval is a convention from the pivotal trials, not a pharmacological constant. The pharmacological argument is that with a week-long…
Publishing an inconvenient result: a case study — the long version Replied, post #38 · Sourcing › Independent verification · 15 Nov 2025 · 5 likes Asking the supplier before publishing a discrepancy is the convention here. Most discrepancies are explained by handling or method and asking costs a day. That is a…
Personal import allowances, compared — a second dataset Replied, post #21 · Access › International · 12 Nov 2025 · 0 likes Coming back to post #19, because the follow-up matters more than the original answer. The most useful thing anyone can add to a thin regional thread is what the…
Promotion criteria, and the one that stops most nominations — the long version Replied, post #86 · Documentation › Doc review · 3 Nov 2025 · 31 likes Reviewing your own nomination is fine and is not sufficient. Somebody else has to read it for the process to mean anything. One more caveat and then I will stop…
A parcel that arrived warm: a decision process, not a verdict Replied, post #97 · Practice › Storage & stability · 22 Oct 2025 · 0 likes Right, and stated more narrowly than I would have dared to state it.
New subcategory: rationale and scope Replied, post #81 · Meta › Announcements · 21 Oct 2025 · 2 likes Last note on this: announcements here get more replies than most topics and almost all of them are questions about scope. That is a hint about what an announcement…
Citing a preprint in a maintained document: our rule and its reasoning — does this still… Replied, post #19 · Evidence › Preprints · 26 Sep 2025 · 0 likes The arithmetic in post #16 is right; the assumption feeding it is the part to check. Always label it as a preprint in any discussion. A preprint is not a published…
Citing a preprint in a maintained document: our rule and its reasoning — does this still… Replied, post #2 · Evidence › Preprints · 24 Sep 2025 · 5 likes Retractions and corrections do not propagate well from preprint servers. A citation that was fine when made can quietly become wrong.
Detection wavelength and why 214 nm and 280 nm disagree Replied, post #50 · Analytics › HPLC & UHPLC · 18 Sep 2025 · 19 likes I had written a reply contradicting post #48 and deleted it. Here is what survived. Adding a small correction to the detection wavelength summary above rather than a…
Discussing something you have already been doing Replied, post #2 · Clinical › Prescriber conversations · 5 Sep 2025 · 23 likes Saving this. It is the version I will quote when the question comes round again.
Liver enzymes drifting down and what that usually means Replied, post #5 · Clinical › Bloodwork · 17 Aug 2025 · 6 likes On liver enzymes drifting I would separate what is worth knowing from what is worth acting on. The first list is long and the second is short, and conflating them is…
TB-500 and thymosin beta-4: the fragment versus the protein Replied, post #104 · Compounds › Repair & healing peptides · 16 Aug 2025 · 19 likes I had written a reply contradicting post #102 and deleted it. Here is what survived. The honest answer on TB-500 and thymosin beta-4 is that it depends, and the useful…
A request that was declined, and the reasoning — a second dataset Replied, post #94 · Documentation › Wiki requests · 15 Aug 2025 · 15 likes Request a new maintained page: if a question recurs, has a good marked solution, and contains a worked example, it is a candidate for promotion to a maintained…
Sodium, potassium and magnesium when intake drops Replied, post #68 · Nutrition & Training › Hydration & electrolytes · 20 Jul 2025 · 0 likes Everything in post #67 holds. The case it does not cover is the one I have. Orthostatic symptoms: dizziness on standing after lying down can indicate dehydration or…
Coming back to: When "no data" is the complete and final answer Replied, post #26 · Compounds › Other compounds · 27 Jun 2025 · 0 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…
Coming back to: Semaglutide half-life: where the 165 to 184 hour figure comes from Replied, post #29 · Compounds › Semaglutide · 15 Jun 2025 · 24 likes Injection site does not appear to matter much for semaglutide exposure. The published comparisons of abdomen, thigh and upper arm found differences small enough to be…
Which panel is worth repeating and which is worth ignoring Replied, post #37 · Clinical › Bloodwork · 12 Jun 2025 · 3 likes Adding the measurement that post #34 says would settle it. Worth separating panel as a question about the compound from panel as a question about the documentation.…
Sequence verification for an obscure compound: how it is done Replied, post #56 · Compounds › Other compounds · 7 Jun 2025 · 15 likes On post #52 — agreed on the reasoning, with one qualification. I would put moderate confidence on the mainstream reading of sequence verification and no more. That is…
Cost per milligram, computed honestly across formats — the long version Replied, post #125 · Access › Pricing · 3 Jun 2025 · 0 likes Appreciated. The plain phrasing does more work here than a longer post would.
Second pass at: Obstructive sleep apnoea and a hard endpoint in this class Replied, post #3 · Clinical › Comorbidities · 26 May 2025 · 27 likes Thyroid history and the C-cell finding is the clearest documented contraindication in this class and is specific rather than general. I keep a log of this specifically…
Semaglutide versus liraglutide head to head: reading STEP 8 carefully Replied, post #6 · Compounds › Semaglutide · 23 May 2025 · 32 likes Post #4 put the caveat in the right place and I want to underline it. The oral formulation is a genuinely different pharmaceutical problem from the injectable and…
The report format the maintainers ask for, and why each field is there — what changed… Replied, post #29 · Sourcing › Vendor reports · 21 May 2025 · 6 likes Post #25 put the caveat in the right place and I want to underline it. Report the certificate figure alongside the independent one. The comparison is the point and it…
A pen that felt like it delivered nothing: diagnosing it afterwards Replied, post #4 · Devices › Pens & autoinjectors · 19 May 2025 · 21 likes Comparing cost per milligram between a pen and a vial ignores wastage, dead volume and the number of doses actually obtainable. Cost per delivered dose at your dose is…
Coming back to: What published stability data actually covers, and what it does not Replied, post #40 · Practice › Storage & stability · 13 May 2025 · 5 likes I had read the opposite somewhere and cannot now find where, which tells me something.
Reading an MS report that only gives you a single number Replied, post #72 · Analytics › Mass spectrometry · 7 May 2025 · 3 likes Resolution: "high resolution" commonly means
Why we hide unevidenced fraud accusations and log the hiding Replied, post #91 · Sourcing › Red flags · 6 May 2025 · 13 likes Where I part company with post #89, and it is a narrow parting. Nothing here should be read as an accusation against a named company, and the guidelines exist so that…
When "no data" is the complete and final answer Replied, post #165 · Compounds › Other compounds · 1 May 2025 · 0 likes Thymosin alpha-1 has a regulatory history in several jurisdictions and a real clinical literature, which puts it in a different evidential category from most of its…
Journal club: STEP 1 and the treatment-policy estimand — does this still hold? Replied, post #14 · Evidence › Journal club · 17 Apr 2025 · 2 likes Adding what did not work for me on STEP 1, since the failures never get written up and they are half the useful information.
Journal club: SURMOUNT-1, read without the press release Replied, post #97 · Evidence › Journal club · 15 Apr 2025 · 0 likes My understanding of SURMOUNT-1 is a few years old and may have been superseded. If it has been, I would genuinely like to know rather than keep repeating it.
A well-designed study with a badly written abstract Replied, post #23 · Evidence › Study critique · 14 Apr 2025 · 0 likes I have three months of notes on well-designed study and the honest summary is that the trend is real and the week-to-week numbers are noise. I nearly drew the opposite…
Coverage for the indication versus for the drug Replied, post #17 · Access › Insurance & coverage · 2 Apr 2025 · 7 likes Where the coverage discussion usually stalls is that nobody wants to say "I do not know" and everyone is willing to say "it varies". Those are the same sentence with…
Retatrutide dose escalation in the published trials Replied, post #77 · Compounds › Retatrutide · 2 Apr 2025 · 15 likes Speaking only to retatrutide dose escalation as I have actually seen it, rather than as it is usually described: the effect is real, it is smaller than the thread…
Why the timeline is on the right and not the left Replied, post #4 · Meta › Site feedback · 30 Mar 2025 · 0 likes Nothing to add, except that this is the answer I would give if asked.
A 5 mg vial and a 0.25 mg dose: the arithmetic in full — the long version Replied, post #63 · Practice › Reconstitution · 26 Mar 2025 · 22 likes Why "add 2 mL" is not an instruction: the powder in the vial takes up space. "Add 2 mL to a 10 mL vial" and "add 2 mL of diluent so the final volume is approximately 2…
Revisiting: German, French and Dutch differences, compared Replied, post #6 · Regional › European Union · 25 Mar 2025 · 2 likes Summarising the German thread so far, since it is long and the answer is buried: the first reply has the method, the fourth has the correction to it, and the rest is…
Biased agonism: a real phenomenon, an over-used explanation Replied, post #129 · Pharmacology › Receptor biology · 19 Mar 2025 · 0 likes Where I part company with post #128, and it is a narrow parting. What I would check first on biased agonism is whether the thing being measured moved or whether the way…
One lot is one lot: when a report becomes a pattern — the long version Replied, post #98 · Sourcing › Vendor reports · 18 Mar 2025 · 1 like Do not adjust a reported figure. Post what the laboratory said and put your interpretation in a separate sentence. The confident version of this sentence would be…
Reading order for a first week here, and what to skip until later Replied, post #33 · Start Here › Welcome · 12 Mar 2025 · 0 likes Reading the guidelines before you post is genuinely worth the twenty minutes. Not because you will break one, but because the rules explain why the place reads the way…
Research-use-only status: what it means legally and practically — a second dataset Replied, post #103 · Compounds › Other compounds · 1 Mar 2025 · 19 likes Picking up post #102: that is the part I would want checked first. Agreed on Research-use-only status, with one qualification that I think matters. The reasoning holds…
Bleeding at the injection site: normal, and what to do about it — does this still hold? Replied, post #6 · Practice › Administration · 20 Feb 2025 · 5 likes A site rotation scheme that actually works: abdomen, outer thigh, back of arm, outer hip. Rotate through them in order, move a minimum 2 cm between consecutive sites,…
Isotope patterns and why the monoisotopic peak is not the tallest Replied, post #16 · Analytics › Mass spectrometry · 18 Feb 2025 · 0 likes Adding a reference point for isotope patterns. Mine is a single case, collected without controls, and I am posting the method alongside it so it can be discounted…
About the Formulation chemistry category Replied, post #5 · Pharmacology › Formulation chemistry · 2 Feb 2025 · 1 like The honest summary: a licensed formulation is a designed system and a reconstituted research preparation is not one. Everything published about the first is at best a…
Triple agonism: additive, synergistic, or neither? Replied, post #13 · Compounds › Retatrutide · 25 Jan 2025 · 14 likes Worth stating the null on triple agonism before we explain it: the observation may be nothing. That possibility deserves a sentence and usually does not get one.
[2026 update] New subcategory: rationale and scope Replied, post #97 · Meta › Announcements · 27 Dec 2024 · 0 likes Adding the measurement that post #96 says would settle it. Speaking only to New subcategory as I have actually seen it, rather than as it is usually described: the…
Molecular mass of semaglutide and why the figure differs between sources — does this… Replied, post #56 · Compounds › Semaglutide · 22 Dec 2024 · 3 likes Picking up post #53: that is the part I would want checked first. Research-use-only semaglutide is not a licensed medicine, is not manufactured to pharmaceutical…
Coming back to: Recording a dissent on a document rather than suppressing it Replied, post #16 · Documentation › Doc review · 19 Dec 2024 · 0 likes Adding a small correction to the Recording a dissent summary above rather than a disagreement with it. The substance holds; one of the figures is out by a factor that…
Reading a supplementary appendix and finding the interesting part Replied, post #29 · Evidence › Trials · 23 Nov 2024 · 0 likes If someone has run reading a supplementary appendix properly I would rather read that than my own reconstruction of it. Posting mine only because the thread has gone…
Choosing which test to pay for, given a fixed budget — does this still hold? Replied, post #35 · Sourcing › Independent verification · 17 Nov 2024 · 21 likes Reading rather than answering, but this is the post I would point somebody at.
Reading a preclinical wound-healing model and its relevance to a human tendon Replied, post #34 · Compounds › Repair & healing peptides · 11 Nov 2024 · 0 likes Research use only, not approved for human use, and in this family that statement carries more weight than usual because the published human safety data is effectively…
The topic list is dense — is that deliberate? Replied, post #44 · Meta › Site feedback · 27 Oct 2024 · 14 likes I had read the opposite somewhere and cannot now find where, which tells me something.
Follow-up: Tirzepatide's shorter half-life and its one practical consequence Replied, post #9 · Compounds › Tirzepatide · 25 Oct 2024 · 18 likes On purity: the trailing-edge features people report on tirzepatide chromatograms are frequently deamidation products, which elute close to the main peak and are easy to…
PIONEER 6 cardiovascular safety, read as a safety trial rather than an efficacy one —… Replied, post #13 · Compounds › Oral incretins · 20 Aug 2024 · 27 likes Adding what did not work for me on PIONEER 6 cardiovascular safety, since the failures never get written up and they are half the useful information.
Relative retention time as a better inter-laboratory comparator — does this still hold? Replied, post #2 · Analytics › Method validation · 1 Jul 2024 · 26 likes The useful distinction on Relative retention time is between what was measured and what was inferred from it. Both end up in the same sentence and only one of them has…