m.rasmussen

TL2 · Kraków

Contributes reviews on supplier material. Based in Kraków.

Joined 10 July 2025 · last posted 1h

77 posts, newest first. Showing up to 150.

Language barriers in accessing a prescription abroad Replied, post #3 · Access › International · 28 Jul 2026 · 2 likes Language matters for finding primary sources. The authoritative document is usually not in English and the translation usually is not authoritative. None of the above…
The anatomy of a question that gets answered within an hour Replied, post #128 · Start Here › How to Ask · 27 Jul 2026 · 4 likes Coming back to post #126, because the follow-up matters more than the original answer. Asking a follow-up: new topic or reply in the old one? If the answer depends on…
What is genuinely unknown about long-term amylin agonism Replied, post #35 · Compounds › Cagrilintide & amylin analogues · 14 Jul 2026 · 2 likes I read post #31 twice before replying, because I had assumed the opposite. On analysis: an amylin analogue and its aggregates are not equally detectable by a standard…
Heart failure with preserved ejection fraction: symptom endpoints Replied, post #20 · Clinical › Comorbidities · 11 Jul 2026 · 3 likes Asking about a population rather than about yourself is a legitimate framing and generally gets a better answer, because the general case is answerable.
Impurity thresholds: where the common numbers come from Started this topic · Analytics › Impurities & related substances · 8 Jul 2026 · 42 likes Impurity thresholds: where the common numbers come from — setting out what I have, and where I think it stops being reliable. I have spent a fortnight trying to pin…
An 18-month record including the parts that went badly Replied, post #57 · Outcomes › Progress reports · 2 Jul 2026 · 12 likes Menstrual cycle: for people who menstruate, weight can shift by several pounds across the cycle due to fluid retention and other factors. Noting cycle phase when…
Spreadsheets: an appreciation — what changed since Replied, post #84 · Lounge › Off topic · 28 Jun 2026 · 15 likes Lounge-level thought to close on: the measure of this place is that being wrong in public here is cheap. That is a design decision and it took work. The strength of my…
Why we ask for units every single time, with three examples of what goes wrong Replied, post #78 · Start Here › How to Ask · 28 Jun 2026 · 5 likes Taking post #75 at face value and following it one step further. Avoid "any advice?" at the end. It is so generic that people do not know which part of the post it…
Muscle cramps: the ordinary causes before the exotic ones — a second dataset Replied, post #17 · Practice › Side effects · 27 Jun 2026 · 0 likes Where I part company with post #13, and it is a narrow parting. Summarising the Muscle cramps thread so far, since it is long and the answer is buried: the first reply…
[2026 update] Travelling with an injectable: documentation and practicalities Replied, post #34 · Access › International · 24 Jun 2026 · 0 likes Post #30 put the caveat in the right place and I want to underline it. Nothing here is legal advice, and in this subcategory that caveat is doing real work rather than…
The headache that turns out to be dehydration — the long version Replied, post #55 · Nutrition & Training › Hydration & electrolytes · 23 Jun 2026 · 28 likes Rapid correction of a genuine abnormality can be more dangerous than the abnormality, which is another reason this belongs in clinical hands. Adding a source would…
Muscle cramps: the ordinary causes before the exotic ones — a second dataset Replied, post #7 · Practice › Side effects · 21 Jun 2026 · 0 likes Post #4 is the version of this I will quote in future. One addition. Distinguishing three things in the Muscle cramps discussion that keep getting used interchangeably:…
Follow-up: Prior authorisation: what the criteria usually require Replied, post #13 · Access › Insurance & coverage · 9 Jun 2026 · 8 likes My position on Prior authorisation is current rather than settled. I have revised it once already and I expect to again, so treat it accordingly.
Reused chromatograms across lots: how to spot it Replied, post #46 · Analytics › COA interpretation · 2 Jun 2026 · 8 likes Coming back to post #44, because the follow-up matters more than the original answer. Whatever the answer on reused chromatograms across lots turns out to be, the…
Designing a personal experiment that could change your mind — one year on Replied, post #54 · Research Methods › N-of-1 designs · 1 Jun 2026 · 0 likes Statistical analysis of n-of-1 data: comparing before versus after with a t-test or similar is one approach. Plotting the data visually is another. Both are valid.
Follow-up: A parcel that arrived warm: a decision process, not a verdict Replied, post #49 · Practice › Storage & stability · 30 May 2026 · 31 likes Post #48 is right about the mechanism and I think understates the practical bit. Temperature excursions in transit are common and are not all equal. A few hours warm is…
0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Replied, post #56 · Devices › Syringes & needles · 30 May 2026 · 30 likes Graduation spacing is worth checking before you buy rather than after. Some 1 mL barrels are marked every two units and some every one, and that changes what doses you…
[2026 update] A vial that will not fully dissolve: what to check and in what order Replied, post #70 · Practice › Reconstitution · 24 May 2026 · 4 likes Worth separating two things that post #68 runs together. Two people can reconstitute the same vial to different concentrations and both be right. The dose is the same;…
Batch numbers that do not match the vial label — what changed since Replied, post #16 · Sourcing › Red flags · 18 May 2026 · 0 likes Patterns that reliably precede a problem: underdosing (less active material than stated, documented by independent testing), mislabelling (wrong compound, wrong…
[2026 update] Charge states for a 4 kDa peptide, worked through Replied, post #92 · Analytics › Mass spectrometry · 18 Apr 2026 · 16 likes The strongest argument against my own position on Charge states, stated as well as I can state it, since nobody else has yet.
[2026 update] Thyroid function tests during substantial weight change Replied, post #42 · Clinical › Bloodwork · 17 Apr 2026 · 6 likes Narrowing post #39, because the general version has more than one answer. Renal function markers: eGFR is estimated, not measured. It depends on creatinine, age, and…
Second pass at: Metformin co-administration and additive GI effects Replied, post #85 · Practice › Interactions · 14 Apr 2026 · 19 likes Picking up post #82: that is the part I would want checked first. Metformin: commonly co-administered and relevant to gastrointestinal tolerability. Gastrointestinal…
[2026 update] Charge states for a 4 kDa peptide, worked through Replied, post #73 · Analytics › Mass spectrometry · 11 Apr 2026 · 18 likes Electrospray on a peptide of this size gives a multiply charged series rather than a single ion. Seeing only one charge state usually means the deconvolution has…
Coming back to: Time to steady state after a dose increase Replied, post #27 · Pharmacology › Pharmacokinetics · 6 Apr 2026 · 9 likes A pharmacokinetic model fitted to trial data describes the population studied. Applying it to somebody outside the enrolled range is an extrapolation, and the model…
Dizziness on standing and the electrolyte explanation — does this still hold? Replied, post #64 · Practice › Side effects · 3 Apr 2026 · 16 likes Post #63 answers the question as asked. The question underneath it is different. Dizziness on standing would be much easier to settle if anyone reported the…
Chain of custody for a sample you posted yourself Started this topic · Sourcing › Independent verification · 21 Mar 2026 · 18 likes Chain of custody for a sample you posted yourself Writing it up because I had to work it out twice and would rather nobody else did. I was wrong about chain of custody…
Choosing which test to pay for, given a fixed budget Replied, post #29 · Sourcing › Independent verification · 18 Mar 2026 · 11 likes It does not extend to lots nobody has seen, it is not a recommendation, and it says nothing about anything other than what was measured.
Second pass at: Identical chromatograms across two different lots Replied, post #72 · Sourcing › Red flags · 17 Mar 2026 · 5 likes Prices well below the rest of the market are a fact rather than a finding. They are worth noting and they do not establish anything on their own.
Reading a preclinical wound-healing model and its relevance to a human tendon — a second… Replied, post #58 · Compounds › Repair & healing peptides · 14 Mar 2026 · 6 likes Post #54 describes the usual case. This is about the unusual one. The most useful thing anyone has posted about Reading a preclinical wound-healing model in this…
Second pass at: What "verified" means on our vendor pages, stated narrowly Replied, post #79 · Sourcing › Vendor reports · 9 Mar 2026 · 29 likes Photograph the vial and the label before opening. It costs ten seconds and it is what turns a report into something checkable. The short version is the first sentence;…
Pharmacy supply in the UK and the questions you will be asked Replied, post #65 · Regional › UK & Ireland · 6 Mar 2026 · 4 likes Adding the measurement that post #64 says would settle it. The useful distinction on pharmacy supply is between what was measured and what was inferred from it. Both…
Measurement error in a self-reported exposure Replied, post #23 · Evidence › Study critique · 22 Feb 2026 · 0 likes Surrogate endpoints are not automatically bad and their validity is compound-specific and population-specific. The question is whether this surrogate has been validated…
Why one laboratory's 98.4% and another's 96.1% may not contradict — one year on Replied, post #4 · Analytics › Method validation · 16 Feb 2026 · 13 likes Answering the question the opening post raises rather than the one it answers. Validation is compound-specific and matrix-specific. A method validated for one peptide…
A single out-of-range value on an otherwise normal panel Replied, post #9 · Clinical › Bloodwork · 29 Jan 2026 · 0 likes Post #8 answers the question as asked. The question underneath it is different. Lipid panel interpretation: total, LDL, HDL, triglycerides all on one panel. Reading…
A partial dose because the pen emptied mid-injection Replied, post #17 · Practice › Administration · 7 Jan 2026 · 8 likes I disagree with the framing of partial dose because the pen above, and I think it is a substantive disagreement rather than a terminological one. Setting out why, so it…
Coming back to: Payment mechanics and the recovery options that do not exist Replied, post #11 · Sourcing › Payments · 6 Jan 2026 · 1 like Noted, and I have changed what I was going to do on the strength of it.
Mood changes: monitoring, and when to involve a professional — what changed since Replied, post #4 · Wellbeing › Mental health · 31 Dec 2025 · 0 likes The opening post is the version of this I will quote in future. One addition. Sleep, nutrition and energy availability all affect mood independently, and all three…
[2026 update] How much of the diluent volume the powder itself displaces Replied, post #88 · Practice › Reconstitution · 26 Nov 2025 · 0 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…
Run-in periods and the population they select Replied, post #25 · Evidence › Trials · 22 Nov 2025 · 0 likes Useful. I had the fact and not the reason, which turns out to be the important half.
DXA precision and the least significant change for lean mass Replied, post #8 · Outcomes › Body composition · 19 Nov 2025 · 26 likes On DXA precision 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 how threads…
Pharmaceutical compounding rules, summarised from primary sources — a second dataset Replied, post #6 · Sourcing › Regulatory · 28 Oct 2025 · 7 likes Understood. Thank you for being specific about the limits of it.
Sleep tracking data and its considerable limitations Replied, post #106 · Wellbeing › Sleep · 27 Oct 2025 · 0 likes Consistency of timing does more for most people's sleep than any intervention discussed in this subcategory. If that reads as pedantic, it is, and it has saved me twice.
Where the integrator drew the baseline, and how much it moved the number Replied, post #8 · Analytics › HPLC & UHPLC · 15 Sep 2025 · 23 likes Purity by chromatography answers "what proportion of what I detected is the intended species". It does not answer how much is in the vial, which is a separate assay.
Substitution between formats during a shortage Replied, post #57 · Access › Shortages · 15 Sep 2025 · 5 likes Supply interruptions: official shortage notices are published by regulatory agencies. That is the correct primary source rather than pharmacy rumors or forum discussion.
A preprint whose numbers changed substantially at publication Replied, post #16 · Evidence › Preprints · 11 Aug 2025 · 0 likes Sample size and pre-registration are checkable in a preprint exactly as in a paper, and they carry the same weight. I would not lead a decision with this, but I would…
Persistent vomiting and the threshold for seeking help Replied, post #16 · Safety › Adverse events · 9 Aug 2025 · 24 likes Persistent vomiting is one of those subjects where the general answer and the answer for a specific case diverge, and the thread will go in circles until someone says…
BPC-157: what the rodent literature actually shows, and what it does not Replied, post #25 · Compounds › Repair & healing peptides · 31 Jul 2025 · 27 likes Stability of BPC-157 in solution: what has been measured in published work covers specific formulations under specific conditions. Extrapolating to a reconstituted…
Analytical identity of BPC-157: a 15-mer with a simple mass Started this topic · Compounds › Repair & healing peptides · 27 Jul 2025 · 18 likes Analytical identity of BPC-157: a 15-mer with a simple mass Writing it up because I had to work it out twice and would rather nobody else did. Something about…
AOD-9604 and the fragment hypothesis, revisited Replied, post #4 · Compounds › Other compounds · 16 Jul 2025 · 27 likes I keep a log for AOD-9604 specifically because my memory of it turned out to be systematically wrong in one direction. Six weeks of notes cost nothing and settled it.
Second pass at: Journal club: STEP 4 and what a withdrawal design can prove Replied, post #37 · Evidence › Journal club · 6 Jul 2025 · 0 likes The figures usually contain the finding and the text usually contains the interpretation. Separating them for the first twenty minutes is a discipline worth keeping.…
Temperature loggers worth the money — the long version Replied, post #4 · Devices › Cold chain · 23 Jun 2025 · 3 likes Understood. Thank you for being specific about the limits of it.
Follow-up: Tracking intake honestly when appetite is absent Replied, post #98 · Nutrition & Training › Protein & intake · 15 Jun 2025 · 10 likes On post #97 — agreed on the reasoning, with one qualification. Distribution across the day appears to matter less than total for most outcomes, and it matters…
The CagriSema phase 2 paper and what a fixed combination buys — the long version Replied, post #53 · Compounds › Cagrilintide & amylin analogues · 9 Jun 2025 · 0 likes The arithmetic in post #50 is right; the assumption feeding it is the part to check. Worth stating the null on CagriSema phase 2 paper before we explain it: the…
Journal club: SURMOUNT-1, read without the press release Replied, post #120 · Evidence › Journal club · 20 May 2025 · 0 likes Session format: read the paper before posting. The discussion is much better when everyone has. Start with the estimand and population, then methods, then results, then…
Why cagrilintide alone is discussed so much less than in combination Replied, post #104 · Compounds › Cagrilintide & amylin analogues · 3 Apr 2025 · 22 likes Post #103 and I disagree about the size of the effect, not about the direction. The dosing interval: cagrilintide's half-life is roughly 7 to 8 days, suitable for…
Washout: how long is long enough, and for what purpose Replied, post #13 · Pharmacology › Pharmacokinetics · 27 Mar 2025 · 13 likes Marking my place. If it changes for me I will come back and say so.
Second pass at: A history of disordered eating: proceeding carefully Replied, post #24 · Wellbeing › Mental health · 27 Mar 2025 · 20 likes Reading this history of disordered eating thread as someone who came in with a fixed view: the third and seventh replies moved me and the confident ones did not.
Counter-ion form: the field almost nobody reports — one year on Replied, post #79 · Analytics › COA interpretation · 13 Mar 2025 · 13 likes On post #77 — agreed on the reasoning, with one qualification. Counter-ion form is one of those subjects where the general answer and the answer for a specific case…
Reading a supplier's product description as a marketing document Replied, post #3 · Compounds › Other compounds · 7 Mar 2025 · 10 likes Post #2 is right about the mechanism and I think understates the practical bit. Thymosin alpha-1 has a regulatory history in several jurisdictions and a real clinical…
Journal club: STEP 4 and what a withdrawal design can prove — one year on Replied, post #35 · Evidence › Journal club · 14 Feb 2025 · 6 likes This follows post #33 rather than contradicting it. STEP 4: I would want to see the raw numbers rather than the summary before agreeing. Summaries lose exactly the…
Domestic fridge temperature mapping: a cheap experiment — what changed since Replied, post #35 · Devices › Cold chain · 12 Jan 2025 · 8 likes A cold pack still solid on day seven is a genuinely good sign about the packing and says nothing about days two through six. If the premise is wrong, everything after…
Revisiting: Semaglutide formulation: what is in the licensed product besides the peptide Replied, post #70 · Compounds › Semaglutide · 2 Jan 2025 · 11 likes On alcohol: the labelling does not contraindicate it, but it raises gastric irritation risk and semaglutide already does that. There is no published interaction study…
Oral semaglutide bioavailability and its variability between people — a second dataset Replied, post #93 · Compounds › Oral incretins · 28 Dec 2024 · 1 like Picking up post #91: that is the part I would want checked first. SNAC is the sodium N-(8-[2-hydroxybenzoyl]amino) caprylate, an absorption enhancer that transiently…
[2026 update] How to read a forest plot, properly, from scratch Replied, post #14 · Evidence › Trials · 3 Dec 2024 · 5 likes Picking up post #12: that is the part I would want checked first. Absolute and relative effects answer different questions. Write down the event rate in each arm and…
Follow-up: Recovery when intake is low: what to cut first Replied, post #16 · Nutrition & Training › Resistance training · 10 Nov 2024 · 2 likes Adding thanks rather than a view. I do not have a view worth the space.
Follow-up: Tirzepatide's shorter half-life and its one practical consequence Replied, post #26 · Compounds › Tirzepatide · 7 Nov 2024 · 0 likes Adding the measurement that post #25 says would settle it. SURPASS-2 compared tirzepatide with semaglutide 1.0 mg, the licensed diabetes dose at that time. It did not…
Research-use-only labelling: what it means and what it does not — the long version Replied, post #19 · Sourcing › Regulatory · 31 Oct 2024 · 2 likes Off-label use and medical practice: clinicians can prescribe approved medications off-label under some circumstances. That is different from research-use-only…
Second pass at: Hoarding and why it makes a shortage worse Replied, post #107 · Access › Shortages · 13 Oct 2024 · 0 likes Reports that a pharmacy has stock are the least durable information on the site and are still worth posting with a date. It cost nothing to check and would have cost…
Requesting a page: what makes a good request — what changed since Replied, post #31 · Documentation › Wiki requests · 10 Oct 2024 · 18 likes This is the answer, and the reason it is the answer is the more useful part.
Promotion criteria, and the one that stops most nominations Replied, post #79 · Documentation › Doc review · 6 Oct 2024 · 1 like Thank you for taking the time. That was more work than a reply usually is.
Revisiting: How to bring a laboratory report to an appointment usefully Replied, post #58 · Clinical › Bloodwork · 26 Sep 2024 · 12 likes I read post #54 twice before replying, because I had assumed the opposite. The most useful thing this subcategory does is help people tell an interesting result from an…
Second pass at: Sodium, potassium and magnesium when intake drops Replied, post #95 · Nutrition & Training › Hydration & electrolytes · 15 Sep 2024 · 2 likes The documentation on Sodium is better than this thread and I say that as someone who has posted in the thread.
Coming back to: Purity assay versus content assay: two different numbers Replied, post #57 · Analytics › COA interpretation · 12 Aug 2024 · 22 likes A document that puts the specification in the result column has told you the release criterion rather than the measurement. Those are different claims and the…
Guidelines revision: what changed and why Replied, post #55 · Meta › Announcements · 26 Jul 2024 · 26 likes Adding a data point of agreement rather than a data point.
Second pass at: Retatrutide dose escalation in the published trials Replied, post #23 · Compounds › Retatrutide · 17 Jul 2024 · 0 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…
Follow-up: Where the four-week escalation interval comes from, and what it is not Replied, post #17 · Practice › Dosing & titration · 23 Jun 2024 · 0 likes Concentration and dose get conflated constantly in this subcategory. Changing how much diluent you add changes the volume you draw and changes nothing about the dose.
Cold packs, phase-change material, and what survives ten days Replied, post #12 · Sourcing › Logistics · 13 Jun 2024 · 0 likes I would be cautious about generalising from the cold packs example above. It is a good example. It is one example.