r.frisk

TL2 · Odense

Contributes reviews on supplier material. Based in Odense.

Joined 1 April 2025 · last posted 1d

76 posts, newest first. Showing up to 150.

What a certificate commits its issuer to Replied, post #113 · Analytics › COA interpretation · 27 Jul 2026 · 0 likes Understood. Thank you for being specific about the limits of it.
Ultrasound and skinfolds: operator dependence in practice Replied, post #75 · Outcomes › Body composition · 25 Jul 2026 · 9 likes Neither method is capable of detecting the month-to-month changes that people report detecting month to month.
Here for the analytics and not much else Replied, post #83 · Lounge › Introductions · 24 Jul 2026 · 0 likes Glad to see another member from outside the usual regions. The access and regional categories are thin for anywhere that is not the UK, EU or North America, and a dated…
Follow-up: How compounding permissions changed when supply normalised Replied, post #44 · Sourcing › Regulatory · 20 Jul 2026 · 31 likes This follows post #43 rather than contradicting it. Generic or biosimilar entry depends on patent and exclusivity positions that are jurisdiction-specific and are…
Comparing my trajectory with the trial curves, carefully — a second dataset Replied, post #76 · Outcomes › Progress reports · 16 Jul 2026 · 17 likes Non-scale victories: muscle gain or maintenance, clothing fit, energy level, and capability (like climbing stairs without breathlessness) are measurements that…
Alcohol: what is documented and what is folklore Replied, post #112 · Practice › Interactions · 15 Jul 2026 · 5 likes Anticoagulant questions come up regularly and are the clearest case for professional advice rather than discussion, because the consequence of being wrong is not…
Athletes in weight-category sports: a different risk calculus Replied, post #23 · Clinical › Special populations · 13 Jul 2026 · 1 like Where I part company with post #19, and it is a narrow parting. Post-surgical populations, particularly after procedures affecting the gastrointestinal tract, interact…
Coming back to: A community side-effect dataset, with its response rate and biases Replied, post #93 · Data & Tools › Datasets · 9 Jul 2026 · 2 likes I had written a reply contradicting post #89 and deleted it. Here is what survived. The practical version of community side-effect dataset is three sentences long. The…
Research-use-only status: what it means legally and practically Replied, post #66 · Compounds › Other compounds · 29 Jun 2026 · 0 likes Research-use-only status is a legal classification, not a safety classification. It means the compound is sold for laboratory use and not for human consumption or…
Reconstituting a multi-strength kit without mixing yourself up — what changed since Replied, post #31 · Practice › Reconstitution · 23 Jun 2026 · 0 likes Good question, well framed, and I would like to see it answered properly.
Tracking a shortage from primary sources rather than rumour Replied, post #58 · Access › Shortages · 19 Jun 2026 · 25 likes That reframing is the whole thing. The facts I already had.
A reconstituted vial's beyond-use date and the reasoning behind common figures Replied, post #75 · Practice › Storage & stability · 7 Jun 2026 · 3 likes Dating prepared solutions: write the date reconstitution on the vial in permanent marker. If you later need to know whether it has been sitting for weeks or days, the…
Injection volume, overload, and peak distortion Replied, post #33 · Analytics › HPLC & UHPLC · 3 Jun 2026 · 26 likes An update on my earlier injection volume post: the pattern held for another six weeks and then stopped, which I did not predict and cannot explain.
Coming back to: What the published dose-response for semaglutide actually looks like… Replied, post #22 · Compounds › Semaglutide · 18 May 2026 · 1 like Thank you for the correction. I would rather find out here than later.
Packaging that arrived damaged: documenting it properly Replied, post #9 · Sourcing › Logistics · 13 May 2026 · 5 likes Peak periods and public holidays affect this more than any other factor and are entirely predictable in advance. That is the version I use. It may not be the version…
Reading a home test result without over-claiming Replied, post #39 · Analytics › Home & field testing · 11 May 2026 · 22 likes Seconded. It reads as careful rather than confident, which is the right register.
Coming back to: Why a preprint's supplementary material is often the best part Replied, post #43 · Evidence › Preprints · 1 May 2026 · 18 likes Post #40 is the version of this I will quote in future. One addition. Say it is a preprint in the first line rather than the last. Everything downstream depends on that…
Reference intervals: how they are constructed and why one in twenty flags Replied, post #87 · Clinical › Bloodwork · 26 Apr 2026 · 24 likes Marking my uncertainty on reference intervals explicitly. I am confident about the direction, much less confident about the size, and not confident at all that it…
Step therapy requirements and how to satisfy them Replied, post #5 · Access › Insurance & coverage · 22 Apr 2026 · 15 likes Out-of-pocket costs: if insurance is not covering it, asking about patient assistance programmes run by manufacturers can reduce costs. Eligibility requirements exist…
Adducts: sodium, potassium, and the peak you did not expect — does this still hold? Replied, post #89 · Analytics › Mass spectrometry · 31 Mar 2026 · 13 likes Resolution and mass accuracy are different specifications. An instrument can resolve two species and still assign their masses imprecisely, and the reverse is also…
An ABAB design with a data table and honest limitations — a second dataset Replied, post #111 · Research Methods › N-of-1 designs · 27 Mar 2026 · 0 likes Acknowledging rather than arguing. The reasoning holds as far as I can follow it.
[2026 update] Composite endpoints and the component doing the work Replied, post #41 · Evidence › Trials · 23 Mar 2026 · 0 likes Risk of bias: structured appraisal of internal validity. Key things to assess: randomisation method (was it truly random or could someone predict the next assignment),…
Journal club: indirect comparison between two programmes, defended and attacked Replied, post #14 · Evidence › Journal club · 22 Mar 2026 · 18 likes Two sentences on indirect comparison and then I will stop, because the rest is speculation and the thread is better without mine. What is documented is narrow. What is…
Reference intervals: how they are constructed and why one in twenty flags Replied, post #64 · Clinical › Bloodwork · 14 Mar 2026 · 0 likes Something worth flagging about reference intervals: the strongest-sounding claims in this thread are the ones with no source attached, which is the usual pattern and…
The lowest dose that does anything: is that a real question? Replied, post #36 · Practice › Dosing & titration · 3 Mar 2026 · 8 likes The arithmetic in post #34 is right; the assumption feeding it is the part to check. Concentration and dose get conflated constantly in this subcategory. Changing how…
Five questions in one post gets you one answer — how to split them Replied, post #20 · Start Here › How to Ask · 26 Feb 2026 · 26 likes Post #19 is right about the mechanism and I think understates the practical bit. Context that matters: compound, how long in, current dose, relevant history. Context…
A calculator that gives a right answer to the wrong question Replied, post #7 · Data & Tools › Calculators · 26 Feb 2026 · 0 likes Why calculators are not medical advice: they do arithmetic. Medical decisions are not arithmetic. A calculator that says a certain dose is "compatible with" a certain…
[2026 update] A rising related-substance total over six months: degradation or method… Replied, post #77 · Analytics › Impurities & related substances · 20 Feb 2026 · 0 likes Deletion sequences (incomplete coupling during synthesis): lower in mass by one residue. Chromatographically they usually elute earlier or later depending on the…
[2026 update] Storing lyophilised material long term: what governs the shelf life Replied, post #69 · Practice › Storage & stability · 20 Feb 2026 · 4 likes Agreed on all of that, and I have nothing to add to it.
Follow-up: A supplier that answers analytical questions with restated claims Replied, post #54 · Sourcing › Red flags · 18 Jan 2026 · 0 likes Answering the question post #50 raises rather than the one it answers. Anonymity: a supplier that will not disclose legal name, address, or responsible person is not…
A parcel stationary at a customs facility for nine days Replied, post #13 · Sourcing › Logistics · 19 Dec 2025 · 15 likes A parcel held for a documentation query usually moves once the document is provided. Chasing the carrier before the query is answered achieves little. This is the sort…
Documentation that appears only after payment Replied, post #102 · Sourcing › Red flags · 10 Dec 2025 · 0 likes Worth stating the null on documentation before we explain it: the observation may be nothing. That possibility deserves a sentence and usually does not get one.
Tracking a preprint to publication: a worked example Replied, post #27 · Evidence › Preprints · 2 Dec 2025 · 0 likes Coming back to post #24, because the follow-up matters more than the original answer. Author track record is a weak signal and it is a signal. A group that has…
Why an oral GLP-1 agonist is a formulation achievement more than a chemistry one Replied, post #66 · Compounds › Oral incretins · 29 Nov 2025 · 0 likes This follows post #65 rather than contradicting it. On variability: the between-person spread in exposure for oral semaglutide is wide enough that two people on the…
Second pass at: Programming during a large energy deficit Replied, post #88 · Nutrition & Training › Resistance training · 19 Nov 2025 · 2 likes Appreciated. The plain phrasing does more work here than a longer post would.
Substitution between formats during a shortage Replied, post #97 · Access › Shortages · 17 Nov 2025 · 2 likes Where an alternative within the class is available, the comparison is a clinical one and the doses are not equivalent. I would treat the number as indicative rather…
EMA product information as a primary source Replied, post #49 · Regional › European Union · 9 Nov 2025 · 0 likes Correcting a stale claim here is more valuable than adding a new one, because the stale claims are what people find first. Take it as a starting point and not as a…
Revisiting: Why tirzepatide titration schedules have more steps than semaglutide's Replied, post #14 · Compounds › Tirzepatide · 7 Nov 2025 · 0 likes SURPASS-2's comparator choice is the criticism that survives. Semaglutide 1.0 mg was the licensed diabetes dose at the time and it was not the highest dose available in…
Second pass at: Metformin co-administration and additive GI effects Replied, post #2 · Practice › Interactions · 31 Oct 2025 · 21 likes On the opening post — agreed on the reasoning, with one qualification. Small methodological point on Metformin co-administration: repeating a measurement is cheap and…
A 40-week log with the measurement method stated Replied, post #75 · Outcomes › Progress reports · 26 Oct 2025 · 8 likes Post #73 and I disagree about the size of the effect, not about the direction. Posting my 40-week log numbers with the method attached so they can be discounted…
Where to report an adverse event officially, by region — a second dataset Replied, post #42 · Safety › Adverse events · 21 Oct 2025 · 1 like Coming back to post #40, because the follow-up matters more than the original answer. Medullary thyroid carcinoma is the reason these compounds are contraindicated in…
Cross-border purchase rules within the EU Replied, post #27 · Regional › European Union · 21 Oct 2025 · 0 likes Picking up post #24: that is the part I would want checked first. Cross-border purchase rules within: I have looked for the primary source twice and failed twice.…
Documentation that appears only after payment Replied, post #46 · Sourcing › Red flags · 11 Oct 2025 · 0 likes Post #43 answers the question as asked. The question underneath it is different. One more thing on documentation that took me far too long to see: the two figures…
Second pass at: Journal club: STEP 4 and what a withdrawal design can prove Replied, post #77 · Evidence › Journal club · 11 Oct 2025 · 8 likes I would be cautious about generalising from the STEP 4 example above. It is a good example. It is one example.
How to read a forest plot, properly, from scratch Replied, post #35 · Evidence › Trials · 2 Oct 2025 · 6 likes Absolute and relative effects answer different questions. Write down the event rate in each arm and the difference between them; everything quotable is derived from…
Managing an unplanned gap in supply — what changed since Replied, post #76 · Access › Shortages · 1 Oct 2025 · 3 likes This follows post #73 rather than contradicting it. Regional differences during a shortage are large, and a supply position in one country says nothing about another.
Thyroid function tests during substantial weight change Replied, post #64 · Clinical › Bloodwork · 17 Sep 2025 · 11 likes Coming back to post #60, because the follow-up matters more than the original answer. Thyroid function tests during substantial has been discussed here with more heat…
Comparing two chromatograms from different laboratories, properly Replied, post #6 · Analytics › HPLC & UHPLC · 27 Aug 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 a 2 ppm match establishes, and what it does not Replied, post #43 · Analytics › Mass spectrometry · 19 Aug 2025 · 21 likes Adding the measurement that post #40 says would settle it. Speaking only to 2 ppm match as I have actually seen it, rather than as it is usually described: the effect…
Travel coolers and how long they really hold Replied, post #39 · Devices › Cold chain · 3 Aug 2025 · 7 likes The failure mode on travel coolers is boring rather than dramatic. It is almost always the step everyone assumes was done correctly because it is too simple to get wrong.
A 10 mg vial reconstituted three different ways, compared — the long version Replied, post #89 · Practice › Reconstitution · 18 Jul 2025 · 6 likes This settles it for me, at least until somebody posts a reason it should not.
Pages past their review date, listed Replied, post #7 · Meta › Wiki maintenance · 17 Jul 2025 · 0 likes Pages past is a good example of a question where the honest answer is boring and the interesting answers are unsupported. I would go with boring.
Follow-up: History of disordered eating and why it changes the conversation Replied, post #24 · Clinical › Special populations · 15 Jun 2025 · 0 likes Adding a small correction to the History of disordered eating summary above rather than a disagreement with it. The substance holds; one of the figures is out by a…
Amylin analogue mechanism: satiety signalling separate from GLP-1 Replied, post #132 · Compounds › Cagrilintide & amylin analogues · 11 Jun 2025 · 3 likes Research-use-only cagrilintide is not approved for human use and the published evidence base is a clinical-trial evidence base. Those two facts sit uncomfortably…
Reading a supplier's product description as a marketing document Replied, post #21 · Compounds › Other compounds · 11 May 2025 · 5 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…
Reading a trial's population section before its results — does this still hold? Replied, post #58 · Evidence › Trials · 1 May 2025 · 0 likes On post #57 — agreed on the reasoning, with one qualification. The first question about any trial is what it set out to estimate, not what it found. Once the estimand…
Asking about a compound your prescriber has not heard of Replied, post #8 · Clinical › Prescriber conversations · 31 Mar 2025 · 2 likes Adding a note of thanks rather than an opinion. I did not know most of that.
Units, standards, and other things that quietly hold the world together Replied, post #5 · Lounge › Off topic · 24 Mar 2025 · 12 likes Adjacent and interesting: you might post something about nutrition, bioavailability from a food perspective, or the sociology of weight. Adjacent to this community's…
Delayed gastric emptying and oral medication absorption: which drugs matter Replied, post #23 · Practice › Interactions · 23 Mar 2025 · 2 likes Two questions I would want answered before drawing anything from the delayed gastric emptying and oral data above: how were the cases selected, and what happened to the…
Over-dilution: when your dose falls below one readable graduation Replied, post #15 · Practice › Reconstitution · 22 Feb 2025 · 2 likes Research-use-only material reconstituted at home is not a compounded sterile preparation and nothing about the procedure makes it one. Members describing what they do…
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly Replied, post #14 · Compounds › Tirzepatide · 2 Feb 2025 · 0 likes On post #10 — agreed on the reasoning, with one qualification. Tirzepatide in type 2 diabetes is a good example of a question where the honest answer is boring and the…
Second pass at: Gauge and length selection for subcutaneous injection Replied, post #20 · Devices › Syringes & needles · 17 Jan 2025 · 0 likes I think the Gauge and length selection question is answerable and has not been answered, which is a more optimistic position than most of this thread.
What changed in 2026, by region Replied, post #59 · Access › International · 5 Jan 2025 · 4 likes Nothing here is legal advice, and in this subcategory that caveat is doing real work rather than sitting decoratively at the end. I would want to see it done twice…
Follow-up: Tirzepatide's shorter half-life and its one practical consequence Replied, post #80 · Compounds › Tirzepatide · 10 Dec 2024 · 10 likes Half-life difference: tirzepatide is about 5 days versus semaglutide's week-long. Practically, that means steady state is reached slightly faster and the post-dose…
Washout with a one-week half-life: the arithmetic Replied, post #18 · Research Methods › N-of-1 designs · 25 Nov 2024 · 6 likes Everything in post #14 holds. The case it does not cover is the one I have. Washout was covered in the wiki last year and the page has a review date on it, which is a…
Revisiting: Melanocortin agonists: mechanism and the documented adverse profile Replied, post #136 · Compounds › Other compounds · 23 Nov 2024 · 31 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…
Two sessions a week versus four: what the evidence supports Replied, post #7 · Nutrition & Training › Resistance training · 18 Nov 2024 · 0 likes Thank you for taking the time. That was more work than a reply usually is.
Converting between mg/mL and units per dose, both directions Replied, post #89 · Practice › Reconstitution · 14 Nov 2024 · 12 likes Post #88 answers the question as asked. The question underneath it is different. Do not shake. Swirl, or leave it. Vigorous agitation introduces air and shear, and…
Time to steady state after a dose increase Replied, post #6 · Pharmacology › Pharmacokinetics · 2 Nov 2024 · 0 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…
Athletes in weight-category sports: a different risk calculus — a second dataset Replied, post #2 · Clinical › Special populations · 24 Oct 2024 · 7 likes Worth stating the null on Athletes in weight-category sports before we explain it: the observation may be nothing. That possibility deserves a sentence and usually does…
Journal club: SURPASS-2 and the semaglutide 1 mg comparator Replied, post #74 · Evidence › Journal club · 15 Oct 2024 · 1 like Post #73 is right about the mechanism and I think understates the practical bit. Small methodological point on SURPASS-2: repeating a measurement is cheap and resolves…
Research-use-only labelling: what it means and what it does not — the long version Replied, post #8 · Sourcing › Regulatory · 7 Oct 2024 · 23 likes Where I part company with post #7, and it is a narrow parting. If you can confirm or contradict a position for your own region, please date the answer. An undated…
The C-cell question: rodent findings and their human context — what changed since Replied, post #61 · Compounds › Semaglutide · 20 Sep 2024 · 22 likes Quietly grateful for the plain phrasing. Not every thread gets that.
Second pass at: Sodium, potassium and magnesium when intake drops Replied, post #55 · Nutrition & Training › Hydration & electrolytes · 23 Aug 2024 · 20 likes Post #54 answers the question as asked. The question underneath it is different. Fluid intake and electrolyte intake are separate questions and drinking more water…
High-resolution MS on aggregates and what it can see — one year on Replied, post #27 · Analytics › Mass spectrometry · 15 Aug 2024 · 0 likes Resolution: "high resolution" commonly means
Splitting a weekly dose in two: the pharmacokinetic argument against — the long version Replied, post #135 · Practice › Dosing & titration · 10 Jul 2024 · 7 likes This follows post #132 rather than contradicting it. A missed dose in a weekly schedule is not a trough to chase. With a week-long half-life you are perturbing a slowly…