h.frisk

TL2 · Aalborg

Contributes reviews on supplier material. Based in Aalborg.

Joined 3 March 2025 · last posted 5d

82 posts, newest first. Showing up to 150.

Seven-day rolling means and why weekly readings mislead Replied, post #87 · Outcomes › Progress reports · 23 Jul 2026 · 0 likes The bit of seven-day rolling that nobody enjoys is that the answer changes depending on what you are trying to decide with it. Say what the decision is and the thread…
What a certificate commits its issuer to — one year on Replied, post #115 · Analytics › COA interpretation · 22 Jul 2026 · 31 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: Hepatic effects of glucagon receptor agonism: the mechanistic worry Replied, post #9 · Compounds › Retatrutide · 21 Jul 2026 · 30 likes Helpful, and short, which on this subject is harder than long.
Rewriting my first post: a before-and-after, with commentary — what changed since Replied, post #13 · Start Here › How to Ask · 5 Jul 2026 · 0 likes Number your questions if there is more than one. It sounds fussy. It means the answer can be numbered back, and you find out which one nobody addressed. This has been…
Journal club: STEP 1 and the treatment-policy estimand — does this still hold? Replied, post #56 · Evidence › Journal club · 2 Jul 2026 · 16 likes Having read the whole STEP 1 thread before replying: the question in the first post has not actually been answered yet, and three of us have answered a nearby one…
Revisiting: How this community labels and discusses unrefereed work Replied, post #13 · Evidence › Preprints · 2 Jul 2026 · 18 likes Small correction to my own earlier position on community labels. I had the units the wrong way round, which changes the conclusion by an order of magnitude and…
Revisiting: The best-written scientific paper you have read Replied, post #26 · Lounge › Off topic · 11 Jun 2026 · 0 likes On best-written scientific paper 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…
[2026 update] A vial that will not fully dissolve: what to check and in what order Replied, post #101 · Practice › Reconstitution · 10 Jun 2026 · 27 likes Agreed, and I will stop repeating the version of this I had been repeating.
CJC-1295 with and without DAC: what the modification does Replied, post #73 · Compounds › Secretagogues & GH axis · 2 Jun 2026 · 4 likes Reading a rodent study on a secretagogue without over-extrapolating: rodent studies can show a mechanism is plausible. They cannot show magnitude of effect in humans or…
Prescription requirements and telehealth models — a second dataset Replied, post #48 · Sourcing › Regulatory · 31 May 2026 · 2 likes An update on my earlier Prescription requirements and telehealth models post: the pattern held for another six weeks and then stopped, which I did not predict and…
[2026 update] Regional warehouse stock versus direct despatch Replied, post #82 · Sourcing › Logistics · 27 May 2026 · 6 likes At what point is a parcel genuinely a problem: if it was despatched weeks ago and there has been no update for days at customs, it might be held or lost. Days of delay…
Transporting a vial for a weekend away — a second dataset Replied, post #54 · Practice › Storage & stability · 15 May 2026 · 0 likes Temperature excursions in transit are common and are not all equal. A few hours warm is a different event from three days warm, and neither is visible in the vial on…
Subgroup analyses: pre-specified versus discovered — a second dataset Replied, post #80 · Evidence › Trials · 9 May 2026 · 1 like Absolute numbers, not just relative: a 30% relative reduction tells you the ratio but not the practical magnitude. The event rate in each arm and the difference between…
Foaming during reconstitution and whether it matters — the long version Replied, post #116 · Practice › Reconstitution · 29 Apr 2026 · 0 likes The best check on any reconstitution calculation is to do it twice by two different routes — mass per volume, then volume per dose — and see whether they agree. They…
Converting between mg/mL and units per dose, both directions — the long version Replied, post #14 · Practice › Reconstitution · 18 Apr 2026 · 30 likes Worked example, since the arithmetic is the whole question. Five milligrams into one millilitre is 5 mg/mL. A 0.25 mg dose is 0.05 mL, which is five units on a U-100…
Two scans six weeks apart on different machines: a cautionary tale Replied, post #2 · Outcomes › Body composition · 17 Apr 2026 · 31 likes Maintenance phase: tracking body composition during maintenance (weight stable) is different from tracking during active loss. Changes are smaller and precision becomes…
Grapefruit: why this class is not the class that cares Replied, post #115 · Practice › Interactions · 3 Apr 2026 · 0 likes Where I part company with post #113, and it is a narrow parting. A pharmacist can answer most questions in this subcategory in a few minutes with access to a proper…
Coming back to: Why a preprint's supplementary material is often the best part Replied, post #4 · Evidence › Preprints · 1 Mar 2026 · 16 likes On post #2 — agreed on the reasoning, with one qualification. Author track record is a weak signal and it is a signal. A group that has published carefully for years is…
Nausea profile of amylin analogues compared with GLP-1 agonists Replied, post #30 · Compounds › Cagrilintide & amylin analogues · 27 Feb 2026 · 14 likes Anyone submitting this for independent testing should say in the submission that it is an amylin analogue rather than an incretin. Method selection differs and a…
Restarting after a long gap: what the labelling implies — the long version Replied, post #5 · Practice › Dosing & titration · 24 Feb 2026 · 9 likes Splitting a weekly dose in two: the pharmacokinetic argument against is that you want the benefit of long half-life, which gives a slowly changing plasma level from a…
Revisiting: A page that has drifted out of date and needs a maintainer Replied, post #91 · Documentation › Wiki requests · 16 Feb 2026 · 0 likes Adding a note of thanks rather than an opinion. I did not know most of that.
Foaming during reconstitution and whether it matters — the long version Replied, post #34 · Practice › Reconstitution · 14 Feb 2026 · 8 likes The documentation on Foaming during reconstitution is better than this thread and I say that as someone who has posted in the thread.
Coming back to: A community side-effect dataset, with its response rate and biases Replied, post #19 · Data & Tools › Datasets · 26 Jan 2026 · 19 likes Where I part company with post #17, and it is a narrow parting. Aggregating first-hand accounts does not produce evidence of the kind a trial produces. It produces a…
Manufacturer assistance programmes and their eligibility rules Replied, post #2 · Access › Pricing · 23 Jan 2026 · 6 likes I read the opening post twice before replying, because I had assumed the opposite. What I would want before treating manufacturer assistance programmes as settled: the…
Pen mechanics when the cartridge is nearly empty — does this still hold? Replied, post #43 · Devices › Pens & autoinjectors · 13 Jan 2026 · 33 likes This follows post #41 rather than contradicting it. Storage after first use: most pens can be stored at room temperature after first use, even if unrefrigerated, for a…
Analytical identity of BPC-157: a 15-mer with a simple mass — does this still hold? Replied, post #4 · Compounds › Repair & healing peptides · 12 Jan 2026 · 0 likes The bit of Analytical identity of BPC-157 that nobody enjoys is that the answer changes depending on what you are trying to decide with it. Say what the decision is and…
Guidelines revision: what changed and why — one year on Replied, post #51 · Meta › Announcements · 27 Dec 2025 · 0 likes What I want from this Guidelines revision thread is the list of things that would need to be true for the claim to hold. If we can write that list, we can check it.
Second pass at: Robustness: the parameters worth deliberately varying Replied, post #30 · Analytics › Method validation · 3 Dec 2025 · 1 like One caution on Robustness: everything above assumes the underlying documentation is what it claims to be. That assumption is doing real work and is rarely stated.
Why an oral GLP-1 agonist is a formulation achievement more than a chemistry one — one… Replied, post #7 · Compounds › Oral incretins · 27 Nov 2025 · 0 likes Why administration conditions matter for oral semaglutide and not for injectables: the oral formulation depends on a transient pH effect in the stomach. Anything that…
Pharmaceutical compounding rules, summarised from primary sources — a second dataset Replied, post #51 · Sourcing › Regulatory · 27 Nov 2025 · 6 likes Read the primary regulatory document rather than a summary of it. Summaries in this area lag by a year routinely and by longer occasionally. If it helps: the failure…
Availability by country, dated, with primary sources Replied, post #76 · Access › International · 25 Nov 2025 · 0 likes Availability, approval and reimbursement are three separate questions and a country can be in a different state on each. The uncertainty is in the assumption, not in…
[2026 update] What steady state means for the decision to escalate Replied, post #99 · Practice › Dosing & titration · 15 Nov 2025 · 16 likes One more thing on steady state that took me far too long to see: the two figures people quote are not measuring the same quantity. Once you notice that, the apparent…
Absence of evidence and evidence of absence Replied, post #5 · Research Methods › Statistics · 11 Nov 2025 · 17 likes The most useful thing anyone has posted about absence of evidence in this category was a table of what had been measured and by whom. That is what I would want again.
Citation sweep results: how many references did not say what was claimed Replied, post #5 · Meta › Wiki maintenance · 10 Nov 2025 · 0 likes Narrowing post #2, because the general version has more than one answer. Adding what did not work for me on citation sweep results, since the failures never get written…
What pooling buys you and what it destroys Replied, post #49 · Evidence › Meta-analyses · 23 Oct 2025 · 0 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…
What happens after your first post: likes, trust levels, and why none of it matters much… Replied, post #102 · Start Here › Welcome · 22 Oct 2025 · 22 likes Your introduction is well framed. You have given enough context that people can actually answer. That is rarer than it sounds and it matters more than it sounds.
Tracking that stops updating and then resumes Replied, post #30 · Sourcing › Logistics · 26 Sep 2025 · 13 likes Split shipments reduce single-point risk and increase the number of transits. Which trade is right depends on what you are protecting against.
A 10 mg vial reconstituted three different ways, compared — the long version Replied, post #126 · Practice › Reconstitution · 16 Sep 2025 · 28 likes Foaming during reconstitution: bubbles in the solution are usually just air incorporated during mixing. They usually resolve with gentle warming and time. Persistent…
Titles that describe the question, not the situation — what changed since Replied, post #18 · Start Here › How to Ask · 15 Sep 2025 · 13 likes Post #17 answers the question as asked. The question underneath it is different. Where the Titles discussion usually stalls is that nobody wants to say "I do not know"…
Second pass at: How to ask a question when you cannot say why you are asking it Replied, post #15 · Start Here › How to Ask · 15 Sep 2025 · 10 likes This follows post #12 rather than contradicting it. Questions you cannot explain: "I cannot say why I am asking this, but is this compound stable at room temperature?"…
Aggregated purity results across four services, with caveats — a second dataset Replied, post #43 · Data & Tools › Datasets · 8 Sep 2025 · 3 likes I had written a reply contradicting post #42 and deleted it. Here is what survived. Aggregating first-hand accounts does not produce evidence of the kind a trial…
"Greater than or equal to 99%" as a specification rather than a result Replied, post #31 · Analytics › COA interpretation · 6 Sep 2025 · 0 likes The distinction between release testing and characterisation is one industrial documents make and retail ones usually do not. It is the difference between "we tested…
Which panel is worth repeating and which is worth ignoring Replied, post #102 · Clinical › Bloodwork · 4 Sep 2025 · 17 likes Agreed on panel, with one qualification that I think matters. The reasoning holds for the case as described. Change the starting assumption and it does not, and the…
Coming back to: The SOUL trial and oral semaglutide cardiovascular outcomes Replied, post #28 · Compounds › Oral incretins · 16 Aug 2025 · 0 likes Research-use-only oral material is not a licensed tablet and there is no reason to assume it carries a functioning absorption-enhancement system at all. The formulation…
Coming back to: Semaglutide half-life: where the 165 to 184 hour figure comes from Replied, post #105 · Compounds › Semaglutide · 6 Aug 2025 · 0 likes Building on post #104 rather than restating it. I think the Semaglutide half-life question is answerable and has not been answered, which is a more optimistic position…
Second pass at: Why this subcategory is stricter about sourcing than most Replied, post #15 · Compounds › Secretagogues & GH axis · 27 Jul 2025 · 6 likes Post #12 answers the question as asked. The question underneath it is different. Reconstitution volumes in this family are often small enough that dead volume in the…
Canadian access and provincial variation — one year on Replied, post #2 · Regional › North America · 17 Jul 2025 · 14 likes Two claims get bundled together under Canadian access and provincial variation and they need separating. The descriptive one — this is what was observed — is usually…
Why a pen's dose steps are fixed and what that costs you — one year on Replied, post #20 · Devices › Pens & autoinjectors · 21 Jun 2025 · 21 likes Injection duration: most pens deliver the dose over several seconds. Holding the button down for the full duration ensures complete delivery. Releasing early can result…
Follow-up: The decimal-point error, and the habit that catches it Replied, post #11 · Practice › Reconstitution · 13 Jun 2025 · 10 likes I had written a reply contradicting post #7 and deleted it. Here is what survived. I disagree with the framing of decimal-point error above, and I think it is a…
[2026 update] An appeal that failed, and what I would do differently Replied, post #93 · Access › Insurance & coverage · 13 Jun 2025 · 29 likes Nobody has said the unglamorous part of appeal yet, so: most of the variation is explained by things that are boring to write about and easy to check.
Revisiting: GLP-1 receptor distribution: central and peripheral Replied, post #2 · Pharmacology › Receptor biology · 25 May 2025 · 5 likes Adding a note of thanks rather than an opinion. I did not know most of that.
DXA precision and the least significant change for lean mass — the long version Replied, post #68 · Outcomes › Body composition · 20 May 2025 · 5 likes Precision versus accuracy: the precision you need depends on what question you are answering. "Am I losing fat?" requires less precision than "Is my lean mass…
Follow-up: History of disordered eating and why it changes the conversation Replied, post #7 · Clinical › Special populations · 10 May 2025 · 24 likes The most useful contribution here is usually a citation to whichever published document comes closest, with a plain statement of how far it is from the question.
Second pass at: Reading a combination trial: attributing effect to components Replied, post #13 · Compounds › Cagrilintide & amylin analogues · 7 May 2025 · 26 likes The arithmetic in post #12 is right; the assumption feeding it is the part to check. Published human data on cagrilintide alone is thinner than on the combination,…
Review: a draft on reconstitution arithmetic, with objections Replied, post #114 · Documentation › Doc review · 19 Apr 2025 · 10 likes The most useful reply I ever got about draft on reconstitution arithmetic was a request to state my units. It sounds like pedantry and it has saved me twice.
A report I filed that turned out to be wrong, and the correction Replied, post #12 · Sourcing › Vendor reports · 12 Apr 2025 · 23 likes Structured report format: compound, lot, independent testing service, method as reported, result, and the certificate figure for the same lot. One lot is one lot. It…
[2026 update] Dose numbers across compounds are not on the same scale Replied, post #9 · Practice › Dosing & titration · 4 Apr 2025 · 0 likes Holding at a dose that is working is a legitimate position and it is not what the trial protocols did. The protocols escalated to a target because they were measuring…
Retatrutide dose escalation in the published trials Replied, post #84 · Compounds › Retatrutide · 3 Apr 2025 · 27 likes Coming back to post #82, because the follow-up matters more than the original answer. Glucagon receptor agonism seems paradoxical in a weight-loss compound because…
Distinguishing a deletion sequence by mass alone — the long version Replied, post #12 · Analytics › Mass spectrometry · 1 Apr 2025 · 21 likes Trifluoroacetate adducts are common in material purified with TFA and are one reason a mass spectrum from a peptide can look busier than expected. That has held every…
Counter-ion form: the field almost nobody reports — one year on Replied, post #136 · Analytics › COA interpretation · 28 Mar 2025 · 0 likes On post #134 — agreed on the reasoning, with one qualification. Two questions I would want answered before drawing anything from the Counter-ion form data above: how…
Second pass at: Cross-border purchase within the EU: the actual rules Replied, post #96 · Access › International · 13 Mar 2025 · 2 likes Temperature-controlled material and long-haul travel is a practical problem with practical solutions, none of which are on the packaging. I keep a log of this…
When to suspect the method rather than the sample Replied, post #95 · Analytics › Method validation · 10 Mar 2025 · 0 likes Post #93 and I disagree about the size of the effect, not about the direction. Robustness testing deliberately varies the parameters most likely to drift — organic…
Validating a method you did not develop — does this still hold? Replied, post #84 · Analytics › Method validation · 7 Mar 2025 · 0 likes Post #83 is the version of this I will quote in future. One addition. System suitability is the ongoing evidence that a validated method is still performing. Validation…
A 5 mg vial and a 0.25 mg dose: the arithmetic in full — what changed since Replied, post #16 · Practice › Reconstitution · 13 Feb 2025 · 9 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…
Random versus fixed effects: choosing rather than defaulting — a second dataset Replied, post #78 · Evidence › Meta-analyses · 8 Feb 2025 · 9 likes Funnel plots: a plot of study effect size versus sample size that helps detect publication bias. If small studies are missing on the negative side, the funnel is…
Scheduled maintenance and what will be unavailable Replied, post #37 · Meta › Announcements · 8 Feb 2025 · 4 likes Worth stating the null on scheduled maintenance before we explain it: the observation may be nothing. That possibility deserves a sentence and usually does not get one.
Protein density versus volume when you cannot eat much Replied, post #32 · Nutrition & Training › Protein & intake · 28 Jan 2025 · 0 likes Building on post #29 rather than restating it. Density matters more than quantity when total intake is limited. The same protein in a smaller volume is the whole game.
Criticising the method without criticising the authors Replied, post #28 · Evidence › Study critique · 1 Jan 2025 · 11 likes Confirming post #25 from a second method, which matters more than confirming it from a second person. An honest declaration on criticising the method without…
What we do not know about retatrutide, listed explicitly Replied, post #33 · Compounds › Retatrutide · 26 Dec 2024 · 4 likes Narrowing post #30, because the general version has more than one answer. Nausea and vomiting were dose-related in the phase 2 work, as they are throughout this class.…
Body image changing more slowly than the body Replied, post #125 · Wellbeing › Mental health · 24 Dec 2024 · 0 likes That is the distinction I keep failing to hold on to. Written down now.
Second pass at: How to research a compound with no human data without deceiving yourself Replied, post #6 · Compounds › Other compounds · 20 Dec 2024 · 6 likes Post #5 answers the question as asked. The question underneath it is different. If someone has run research a compound properly I would rather read that than my own…
About the Pricing category Replied, post #3 · Access › Pricing · 20 Dec 2024 · 2 likes As a member rather than staff: the most useful thing I did when I started reading this category was to work through the tag pages rather than the topic list. The topic…
Body image changing more slowly than the body Replied, post #31 · Wellbeing › Mental health · 14 Dec 2024 · 0 likes The arithmetic in post #30 is right; the assumption feeding it is the part to check. My experience of body image contradicts the reply above. I am posting it as a data…
Why "any advice?" is the least effective ending for a post Replied, post #71 · Start Here › How to Ask · 25 Nov 2024 · 31 likes The arithmetic in post #70 is right; the assumption feeding it is the part to check. Tag your own topic. Two accurate tags do more for how findable it is than a long…
Levothyroxine timing: a real interaction with a simple fix Replied, post #9 · Practice › Interactions · 19 Nov 2024 · 2 likes Supplements and herbs: many have no established interaction. Some do. If you are taking something unusual, checking a reference (like a pharmacist) is more useful than…
Time to steady state after a dose increase Replied, post #145 · Pharmacology › Pharmacokinetics · 6 Nov 2024 · 0 likes Fasting requirement for oral semaglutide: food and large fluid volumes reduce absorption. The fasting window (30 minutes before and 30 minutes after) is designed to…
Time to steady state after a dose increase Replied, post #69 · Pharmacology › Pharmacokinetics · 4 Nov 2024 · 1 like Adding the measurement that post #68 says would settle it. Where two sources give different half-lives, check the study design before deciding either is wrong. Sampling…
Second pass at: A field-by-field walk through a certificate of analysis Replied, post #103 · Analytics › COA interpretation · 1 Nov 2024 · 13 likes Building on post #100 rather than restating it. I think the field-by-field walk through a certificate question is answerable and has not been answered, which is a more…
How to ask for a dose change without antagonising anyone — what changed since Replied, post #15 · Clinical › Prescriber conversations · 29 Oct 2024 · 8 likes Bringing a record of symptoms with dates and severities makes an assessment materially easier and is the single most useful preparation. That is the honest state of it…
Hypertension improvement and when medication needs revisiting — a second dataset Replied, post #6 · Clinical › Comorbidities · 8 Oct 2024 · 22 likes Post #2 put the caveat in the right place and I want to underline it. Nobody has said the unglamorous part of Hypertension improvement yet, so: most of the variation is…
Splitting a vial for two laboratories: how to do it without ruining both — what changed… Replied, post #26 · Sourcing › Independent verification · 30 Aug 2024 · 20 likes I had written a reply contradicting post #24 and deleted it. Here is what survived. The record shows what was measured. Everything beyond that is inference and this…
Assessing a warm arrival: the decision process — one year on Replied, post #103 · Sourcing › Logistics · 1 Jun 2024 · 2 likes My experience of Assessing a warm arrival contradicts the reply above. I am posting it as a data point rather than as a refutation, because one person's experience is…