f.abrahamsen

TL2 Member · Wakefield, UK

Based in the EU. Tracks what is available and funded locally, and dates every claim.

Joined 4 October 2025 · last posted 7d · groups: regional-eu

89 posts, newest first. Showing up to 150.

Transit times by route, from a logged dataset Replied, post #24 · Sourcing › Logistics · 21 Jul 2026 · 12 likes Tracking stops updating: tracking last updated days ago usually means the package is in transit and will not update until it reaches the next scanning point. No update…
Stability of BPC-157 in solution: what has been measured — one year on Replied, post #94 · Compounds › Repair & healing peptides · 19 Jul 2026 · 12 likes Understood, and I withdraw the assumption I opened with.
Submitting a sample: the process end to end Replied, post #93 · Sourcing › Independent verification · 19 Jul 2026 · 0 likes On post #91 — agreed on the reasoning, with one qualification. Where I have landed on submitting a sample, having got it wrong once in public: the direction is clear,…
Prescription portability between countries Replied, post #98 · Access › International · 14 Jul 2026 · 4 likes Coming back to post #94, because the follow-up matters more than the original answer. Summarising the prescription portability between countries thread so far, since it…
Ultrasound and skinfolds: operator dependence in practice Replied, post #56 · Outcomes › Body composition · 13 Jul 2026 · 3 likes Since ultrasound and skinfolds keeps coming up, it should probably be a maintained page rather than a recurring thread. I am happy to draft it if someone with more…
Priming a pen and whether the primed volume is wasted Replied, post #4 · marked as the solution · Devices › Pens & autoinjectors · 13 Jul 2026 · 32 likes Needle installation: some pens require a fresh needle for each injection; others have a single needle that stays attached. Check the design of your pen. Marking that as…
The anatomy of a question that gets answered within an hour — does this still hold? Replied, post #18 · Start Here › How to Ask · 12 Jul 2026 · 21 likes Post #17 is right about the mechanism and I think understates the practical bit. Asking a follow-up: new topic or reply in the old one? If the answer depends on the…
What to include when your question involves a chromatogram — one year on Replied, post #72 · Start Here › How to Ask · 11 Jul 2026 · 5 likes This follows post #69 rather than contradicting it. It is fine to say you cannot explain why you are asking. Nobody will press, and the technical part of the question…
A supplier who responds to a discrepancy with silence — what changed since Replied, post #78 · Sourcing › Red flags · 10 Jul 2026 · 10 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.
Coming back to: Time to steady state after a dose increase Replied, post #90 · Pharmacology › Pharmacokinetics · 1 Jul 2026 · 0 likes Picking up post #87: that is the part I would want checked first. Metabolism for peptide drugs is proteolytic rather than hepatic in the usual sense, which is why the…
CJC-1295 with and without DAC: what the modification does Replied, post #91 · Compounds › Secretagogues & GH axis · 22 Jun 2026 · 6 likes I had written a reply contradicting post #87 and deleted it. Here is what survived. The failure mode on CJC-1295 is boring rather than dramatic. It is almost always the…
Stability of BPC-157 in solution: what has been measured — one year on Replied, post #71 · Compounds › Repair & healing peptides · 13 Jun 2026 · 0 likes Dose-response is unstudied in humans for essentially everything in this family, which means the confident numbers in circulation came from somewhere other than a trial.…
[2026 update] Reading a chromatogram someone posted without axes Replied, post #3 · Analytics › HPLC & UHPLC · 9 Jun 2026 · 0 likes Narrowing the opening post, because the general version has more than one answer. On integration: where the baseline is drawn matters more than most people realise. On…
A fridge failure and how I assessed the contents afterwards Replied, post #13 · Devices › Cold chain · 8 Jun 2026 · 27 likes Where I have landed on fridge failure, having got it wrong once in public: the direction is clear, the magnitude is not, and anyone quoting a precise magnitude has…
Transporting a vial for a weekend away — a second dataset Replied, post #70 · Practice › Storage & stability · 2 Jun 2026 · 0 likes I came in to disagree and I am leaving without a disagreement.
An appeal that succeeded, with the letter structure — the long version Replied, post #39 · Access › Insurance & coverage · 1 Jun 2026 · 12 likes Picking up post #38: that is the part I would want checked first. The documentation on appeal is better than this thread and I say that as someone who has posted in the…
[2026 update] Does a peptide degrade silently, with no visual change? Replied, post #65 · Practice › Storage & stability · 27 May 2026 · 1 like One more thing on peptide 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…
An appeal that succeeded, with the letter structure — the long version Replied, post #10 · Access › Insurance & coverage · 24 May 2026 · 17 likes If someone has run appeal properly I would rather read that than my own reconstruction of it. Posting mine only because the thread has gone quiet.
Reading a trial's population section before its results Replied, post #17 · Evidence › Trials · 13 May 2026 · 2 likes I had written a reply contradicting post #15 and deleted it. Here is what survived. A treatment-policy estimand asks what happens to people assigned to a strategy,…
[2026 update] Storing lyophilised material long term: what governs the shelf life Replied, post #111 · Practice › Storage & stability · 6 May 2026 · 0 likes Lyophilised material is far more stable than the same material in solution. That is why suppliers ship it dry, and it is the reason to reconstitute only what will be…
Travelling with an injectable: documentation and practicalities Replied, post #25 · Access › International · 4 May 2026 · 1 like The arithmetic in post #22 is right; the assumption feeding it is the part to check. Temperature-controlled material and long-haul travel is a practical problem with…
Official shortage notices and what they authorise Replied, post #28 · Access › Shortages · 1 May 2026 · 22 likes On post #24 — agreed on the reasoning, with one qualification. I disagree with the framing of official shortage notices above, and I think it is a substantive…
Designing a personal experiment that could change your mind — one year on Replied, post #39 · Research Methods › N-of-1 designs · 28 Apr 2026 · 0 likes Taking post #38 at face value and following it one step further. What would change my mind on Designing a personal experiment is a second dataset collected by someone…
Revisiting: Journal club: SURMOUNT-1, read without the press release Replied, post #40 · Evidence › Journal club · 28 Apr 2026 · 4 likes Building on post #37 rather than restating it. The number people quote for SURMOUNT-1 is a central estimate presented without its interval, and the interval is wide…
Coming back to: A structured critique template this community uses Replied, post #2 · Evidence › Study critique · 26 Apr 2026 · 0 likes Where I part company with the opening post, and it is a narrow parting. On structured critique template I would separate what is worth knowing from what is worth acting…
List price versus negotiated price versus what you pay Replied, post #35 · Access › Pricing · 11 Apr 2026 · 0 likes Larger orders shift risk as well as price, because more of your material then comes from one lot. On balance I think that is right, and I would not bet much on it.
Sample handling between despatch and injection Replied, post #20 · Analytics › Method validation · 5 Apr 2026 · 10 likes Answering the question post #16 raises rather than the one it answers. A method transferred between laboratories needs a demonstration that it performs equivalently,…
Follow-up: State-level differences that actually matter Replied, post #34 · Regional › North America · 5 Apr 2026 · 5 likes Nothing in this subcategory is medical or legal advice, and the clinicians posting here say so on their own account. Someone will know this better than I do and I hope…
[2026 update] Distinguishing expected GI effects from something that needs urgent… Replied, post #10 · Practice › Side effects · 19 Mar 2026 · 12 likes I had written a reply contradicting post #9 and deleted it. Here is what survived. Vomiting: when it is expected (first-dose reactions or early titration) and when it…
[2026 update] Composite endpoints and the component doing the work Replied, post #30 · Evidence › Trials · 14 Mar 2026 · 14 likes 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…
Contributing data without breaching anyone's privacy Replied, post #67 · Data & Tools › Datasets · 6 Mar 2026 · 15 likes Worth separating two things that post #65 runs together. Worth separating contributing data without breaching as a question about the compound from contributing data…
What a certificate commits its issuer to — one year on Replied, post #24 · Analytics › COA interpretation · 28 Feb 2026 · 2 likes The signature block matters more than it appears to. A named individual with a date is a different kind of document from an unsigned one, whatever the numbers say.…
The 2.5 mg starting dose is not a therapeutic dose — why that matters Replied, post #23 · Compounds › Tirzepatide · 22 Feb 2026 · 9 likes The honest answer on 2.5 mg starting dose is that it depends, and the useful part is the list of what it depends on. Four items, in rough order of how much they matter.…
Second pass at: The topic list is dense — is that deliberate? Replied, post #67 · Meta › Site feedback · 9 Feb 2026 · 15 likes On post #65 — agreed on the reasoning, with one qualification. Reading this topic list thread as someone who came in with a fixed view: the third and seventh replies…
Muscle cramps: the ordinary causes before the exotic ones Replied, post #77 · Practice › Side effects · 20 Jan 2026 · 9 likes Post #76 is right about the mechanism and I think understates the practical bit. Delayed gastric emptying: the mechanism behind much of the gastrointestinal side-effect…
Designing a personal experiment that could change your mind Replied, post #3 · Research Methods › N-of-1 designs · 17 Jan 2026 · 8 likes Record everything that changed, not just the intervention. Personal experiments are confounded by life, and the confounders are only recoverable if they were written…
Aggregates and why a purity assay may miss them entirely Replied, post #63 · Analytics › Impurities & related substances · 10 Jan 2026 · 1 like Worth separating two things that post #62 runs together. The useful distinction on aggregates is between what was measured and what was inferred from it. Both end up in…
Distinguishing expected GI effects from something that needs urgent attention Replied, post #57 · Practice › Side effects · 8 Jan 2026 · 6 likes Fine by me. I had wanted a stronger conclusion and there is not one available.
Realistic expectations for strength while losing weight quickly Replied, post #47 · Nutrition & Training › Resistance training · 24 Dec 2025 · 0 likes The arithmetic in post #44 is right; the assumption feeding it is the part to check. Joint comfort frequently improves with weight reduction, and members here report…
The decimal-point error, and the habit that catches it Replied, post #108 · Practice › Reconstitution · 18 Dec 2025 · 0 likes Coming back to post #106, because the follow-up matters more than the original answer. Decimal-point error is well covered in the tag pages, and the older discussions…
Personal import allowances, compared — a second dataset Replied, post #34 · Access › International · 10 Dec 2025 · 0 likes Quietly grateful for the plain phrasing. Not every thread gets that.
Pen dose counters: what a click does and does not guarantee Replied, post #73 · Devices › Pens & autoinjectors · 17 Nov 2025 · 30 likes Helpful, and easy to find again, which is half of what a good reply is.
A parcel that arrived warm: a decision process, not a verdict Replied, post #137 · Practice › Storage & stability · 13 Nov 2025 · 12 likes Clarity is a weak test. A solution can lose a significant fraction of its active content to degradation or adsorption while remaining perfectly clear. The evidence for…
A payment that went through twice: how it was resolved Replied, post #8 · Sourcing › Payments · 10 Nov 2025 · 9 likes This follows post #5 rather than contradicting it. Minimum order quantities are a legitimate commercial constraint and are worth asking about before designing an order…
EMA product information as a primary source Replied, post #30 · Regional › European Union · 4 Nov 2025 · 3 likes The documentation on EMA product information is better than this thread and I say that as someone who has posted in the thread.
Detection wavelength and why 214 nm and 280 nm disagree Replied, post #75 · Analytics › HPLC & UHPLC · 2 Nov 2025 · 0 likes Thank you — that answers what I came here to find out.
Coverage in the US: a map of the usual obstacles Replied, post #5 · Regional › North America · 27 Oct 2025 · 14 likes United States: FDA licenses compounds. Prescribing and pharmacy practice are state-regulated. Compounds are prescription-only. Coverage is decided by individual plans,…
SURMOUNT-4 and what withdrawal data does and does not tell an individual — one year on Replied, post #98 · Compounds › Tirzepatide · 23 Oct 2025 · 0 likes On SURMOUNT-4 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…
MHRA statements, read directly Replied, post #14 · Regional › UK & Ireland · 11 Oct 2025 · 5 likes Answering the question post #13 raises rather than the one it answers. I would rather this thread reach "we do not know" about MHRA statements than reach a confident…
Why catalogue breadth is not evidence of anything — what changed since Replied, post #65 · Compounds › Other compounds · 7 Oct 2025 · 3 likes Where the catalogue breadth 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…
Second pass at: Circumference measurements as a poor man's composition estimate Replied, post #2 · Outcomes › Body composition · 30 Sep 2025 · 1 like Marking my uncertainty on Circumference measurements explicitly. I am confident about the direction, much less confident about the size, and not confident at all that…
Promotion criteria, and the one that stops most nominations — the long version Replied, post #55 · Documentation › Doc review · 10 Sep 2025 · 26 likes I had written a reply contradicting post #51 and deleted it. Here is what survived. Two questions I would want answered before drawing anything from the Promotion…
Tracking that stops updating and then resumes Replied, post #18 · Sourcing › Logistics · 15 Aug 2025 · 2 likes Confirming post #15 from a second method, which matters more than confirming it from a second person. Split shipments reduce single-point risk and increase the number…
Checking someone else's arithmetic: a worked example thread Replied, post #77 · Practice › Reconstitution · 13 Aug 2025 · 24 likes Preservative effectiveness is tested against a defined microbial challenge under defined conditions. It is not a licence to treat an entered vial as sterile…
Semaglutide versus liraglutide head to head: reading STEP 8 carefully Replied, post #38 · Compounds › Semaglutide · 7 Aug 2025 · 7 likes This follows post #36 rather than contradicting it. Reading back through the semaglutide versus liraglutide threads from last year, the same three questions come up…
Travel coolers and how long they really hold Replied, post #14 · Devices › Cold chain · 31 Jul 2025 · 5 likes A note on scope: what I am saying about travel coolers applies to the case in the first post and I would not extend it further without checking.
Subcutaneous absorption kinetics and site differences Replied, post #19 · Pharmacology › Pharmacokinetics · 31 Jul 2025 · 16 likes A definition problem is doing most of the work in this subcutaneous absorption kinetics and site discussion. Once the term is pinned down I suspect the disagreement…
BPC-157: what the rodent literature actually shows, and what it does not — a second… Replied, post #77 · Compounds › Repair & healing peptides · 30 Jul 2025 · 2 likes Counterpoint on BPC-157, offered without confidence: the same observation is consistent with a much duller explanation, and nobody has ruled the dull one out.
How to research a compound with no human data without deceiving yourself Replied, post #17 · Compounds › Other compounds · 30 Jul 2025 · 0 likes The honest summary for most of this subcategory: a plausible mechanism, animal data, and first-hand accounts. Saying so is more useful than assembling the accounts into…
Regression to the mean in progress reports Replied, post #23 · Research Methods › Statistics · 21 Jun 2025 · 28 likes Seconded. It reads as careful rather than confident, which is the right register.
A report I filed that turned out to be wrong, and the correction Replied, post #110 · Sourcing › Vendor reports · 19 Jun 2025 · 11 likes Post #107 and I disagree about the size of the effect, not about the direction. Photograph the vial and the label before opening. It costs ten seconds and it is what…
Validating a calculator against hand arithmetic — what changed since Replied, post #121 · Data & Tools › Calculators · 8 Jun 2025 · 0 likes Nothing a calculator produces is medical advice, and a correct calculation on inappropriate inputs is still an inappropriate answer. This has been discussed before and…
Albumin binding and how it produces a long half-life Replied, post #43 · Pharmacology › Pharmacokinetics · 1 Jun 2025 · 13 likes Coming back to post #41, because the follow-up matters more than the original answer. On albumin binding, I would rather understate and be corrected upward than…
Coming back to: What published stability data actually covers, and what it does not Replied, post #50 · Practice › Storage & stability · 27 May 2025 · 0 likes This follows post #49 rather than contradicting it. The useful distinction on published stability data actually covers is between what was measured and what was…
Revisiting: Why I ask for the gradient before I discuss the number Replied, post #5 · Analytics › HPLC & UHPLC · 4 May 2025 · 1 like 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.…
Why we hide unevidenced fraud accusations and log the hiding Replied, post #84 · Sourcing › Red flags · 22 Apr 2025 · 22 likes Nothing here should be read as an accusation against a named company, and the guidelines exist so that reports remain reports.
Cost per milligram, computed honestly across formats — the long version Replied, post #58 · Access › Pricing · 8 Apr 2025 · 0 likes Nothing here is financial advice and none of it is a route to a transaction. It is a small point and it changes the answer, which is an awkward combination.
A certificate with no method stated: what can you conclude? Replied, post #22 · Analytics › COA interpretation · 3 Apr 2025 · 14 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…
Requesting a page: what makes a good request Replied, post #38 · Documentation › Wiki requests · 29 Mar 2025 · 28 likes The commonest reason a good request stalls is that nobody converted it into a draft. A rough draft attracts editors; a request does not.
Counter-ion content and its effect on measured mass Replied, post #2 · Analytics › Mass spectrometry · 17 Mar 2025 · 14 likes The opening post put the caveat in the right place and I want to underline it. For a compound with no reference standard in circulation, an observed mass is much more…
An emergency department visit, described afterwards Replied, post #4 · Safety › Adverse events · 16 Mar 2025 · 1 like The arithmetic in the opening post is right; the assumption feeding it is the part to check. A request rather than an answer: could whoever has the primary source for…
One lot is one lot: when a report becomes a pattern — the long version Replied, post #6 · Sourcing › Vendor reports · 14 Mar 2025 · 6 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…
Reading order for a first week here, and what to skip until later Replied, post #7 · Start Here › Welcome · 17 Feb 2025 · 0 likes The moderation log is public. Every staff action is logged with the rule cited and the reasoning stated. If you get moderated, the explanation is there and it is worth…
Counter-ion form: the field almost nobody reports — one year on Started this topic · Analytics › COA interpretation · 13 Feb 2025 · 2 likes On the subject in the title: Counter-ion form: the field almost nobody reports — one year on Working notes rather than a conclusion. The question about Counter-ion form…
Distinguishing a deletion sequence by mass alone Replied, post #80 · Analytics › Mass spectrometry · 12 Feb 2025 · 3 likes Resolution: "high resolution" commonly means
Second pass at: Certificates issued by the seller versus by a laboratory Replied, post #59 · Analytics › COA interpretation · 26 Jan 2025 · 6 likes Amino acid analysis gives content: it hydrolyses the peptide and quantifies the residues. It measures the peptide content independent of chromatographic purity. Very…
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly Replied, post #7 · Compounds › Tirzepatide · 19 Jan 2025 · 10 likes Categorical response thresholds — the proportion reaching ten, fifteen or twenty per cent reduction — are more persuasive and less informative than the mean. They…
Follow-up: Tirzepatide's shorter half-life and its one practical consequence Replied, post #120 · Compounds › Tirzepatide · 31 Dec 2024 · 7 likes Reading rather than contributing, but this is the most useful thread I have found on it.
Reconstituting a multi-strength kit without mixing yourself up Replied, post #16 · Practice › Reconstitution · 30 Dec 2024 · 10 likes This settles it for me, at least until somebody posts a reason it should not.
Revisiting: What a well-designed human trial of a secretagogue would look like Replied, post #7 · Compounds › Secretagogues & GH axis · 28 Dec 2024 · 24 likes Injection-site reactions are reported more often in this family than for the incretins. Whether that is the compounds or the preparations they are typically supplied in…
Molecular mass of semaglutide and why the figure differs between sources — does this… Replied, post #42 · Compounds › Semaglutide · 21 Dec 2024 · 0 likes Coming back to post #38, because the follow-up matters more than the original answer. On dose steps: the four-week interval in the pivotal programme was a trial design…
Revisiting: Bug report: the reconstitution calculator and a rounding edge case Replied, post #11 · Data & Tools › Calculators · 5 Dec 2024 · 6 likes Taking post #8 at face value and following it one step further. Rounding behaviour is where two tools disagree. One rounding to the nearest graduation and one to two…
Reading a supplementary appendix and finding the interesting part Replied, post #37 · Evidence › Trials · 5 Dec 2024 · 4 likes Reading a supplementary appendix was covered in the wiki last year and the page has a review date on it, which is a better starting point than my memory of a thread.
Reading a preclinical wound-healing model and its relevance to a human tendon Replied, post #140 · Compounds › Repair & healing peptides · 25 Nov 2024 · 23 likes Understood, and I withdraw the assumption I opened with.
Second pass at: Buffers, pH and why a formulation is a formulation Replied, post #16 · Pharmacology › Formulation chemistry · 24 Oct 2024 · 8 likes The version of Buffers that circulates here is a simplification of a simplification. It is not wrong, but it has lost the conditions under which it holds, and those…
Blind submission and why it changes minds Replied, post #92 · Sourcing › Independent verification · 19 Oct 2024 · 18 likes Repeat testing: if you want to verify the same lot a second time, testing with a different service strengthens the conclusion. Testing with the same service verifies…
Semaglutide half-life: where the 165 to 184 hour figure comes from — what changed since Replied, post #25 · Compounds › Semaglutide · 13 Oct 2024 · 13 likes The C-cell question: semaglutide triggered medullary thyroid carcinoma in rodent toxicology studies. A signal in rodents does not automatically appear in humans, but it…
Hepatic effects of glucagon receptor agonism: the mechanistic worry Replied, post #8 · marked as the solution · Compounds › Retatrutide · 28 Aug 2024 · 9 likes Whether triple agonism is additive or synergistic is an open question and the published work does not answer it. A phase 2 trial without a dual-agonist comparator arm…
The mass-error checker and its intended scope Replied, post #111 · Data & Tools › Calculators · 10 Jul 2024 · 5 likes Post #110 and I disagree about the size of the effect, not about the direction. Precision and significant figures: the calculators do not round to match your input…