a.eriksen

TL2 · Essen

Contributes reviews on supplier material. Based in Essen.

Joined 15 July 2025 · last posted 7d

74 posts, newest first. Showing up to 150.

Common supplements people ask about, assessed one at a time Replied, post #74 · Practice › Interactions · 20 Jul 2026 · 0 likes Alcohol is not contraindicated in the labelling and it does irritate a stomach that is already emptying slowly. There is no published interaction study, and the…
What to bring: records that a clinician can actually use — a second dataset Replied, post #53 · Clinical › Prescriber conversations · 19 Jul 2026 · 0 likes Useful. I had the fact and not the reason, which turns out to be the important half.
Transit times by route, from a logged dataset Replied, post #15 · Sourcing › Logistics · 17 Jul 2026 · 0 likes Post #14 is the version of this I will quote in future. One addition. One more thing on transit times that took me far too long to see: the two figures people quote are…
Revisiting: Can a home kit substitute for a laboratory report? A careful no Replied, post #51 · Analytics › Home & field testing · 16 Jul 2026 · 0 likes The reason home kit substitute is hard to answer is that the obvious measurement and the relevant quantity are not the same thing, and substituting one for the other is…
Named, unnamed and unspecified impurities as regulatory categories — the long version Replied, post #63 · Analytics › Impurities & related substances · 10 Jul 2026 · 0 likes Aggregates may be a multiple of the monomer mass and may not elute at all under a standard method. What does not come off the column does not appear in the area…
Restarting after a long gap: what the labelling implies Replied, post #15 · Practice › Dosing & titration · 7 Jul 2026 · 1 like The starting dose in most of these programmes is a tolerance step and produces little effect by design. Judging the compound at the starting dose is judging the wrong…
Pooling trials with different estimands Replied, post #35 · Evidence › Meta-analyses · 19 Jun 2026 · 0 likes Subgroup analysis: sometimes a meta-analysis reports separate pooled estimates for different subgroups (e.g., by baseline body mass index or by trial duration). Be…
Subgroup analyses: pre-specified versus discovered Replied, post #2 · Evidence › Trials · 14 Jun 2026 · 22 likes Seconded. It reads as careful rather than confident, which is the right register.
NHS criteria and how they are applied in practice Started this topic · Regional › UK & Ireland · 10 Jun 2026 · 0 likes NHS criteria and how they are applied in practice — setting out what I have, and where I think it stops being reliable. I was wrong about NHS criteria in a thread last…
GHRH analogues versus ghrelin mimetics: different mechanisms, conflated discussion Replied, post #17 · Compounds › Secretagogues & GH axis · 4 Jun 2026 · 0 likes Agreed, and I will stop repeating the version of this I had been repeating.
Forced degradation studies: designing one that is informative Replied, post #67 · Analytics › Method validation · 31 May 2026 · 9 likes The limit of quantitation determines what the impurity table can honestly contain. Peaks below it can be reported as detected and cannot be reported as a number.
Pinch or no pinch, and how needle length changes the answer — the long version Replied, post #66 · Practice › Administration · 29 May 2026 · 8 likes Two people in this thread mean different things by Pinch and are disagreeing about the definition while believing they are disagreeing about the facts. Worth pausing to…
Reading a trial's population section before its results Replied, post #39 · Evidence › Trials · 21 May 2026 · 0 likes Funding and trial conduct should be stated and are a weak predictor of anything on their own. Design quality is the stronger signal and it is checkable.
Journal club: STEP 1 and the treatment-policy estimand — does this still hold? Replied, post #22 · Evidence › Journal club · 18 May 2026 · 0 likes My experience of STEP 1 contradicts the reply above. I am posting it as a data point rather than as a refutation, because one person's experience is exactly that.
GLP-1 receptor distribution: central and peripheral — one year on Replied, post #9 · Pharmacology › Receptor biology · 16 Apr 2026 · 3 likes The area postrema sits outside the blood-brain barrier and is where a great deal of the nausea signalling in this class originates. That is why the effect is central…
MS/MS sequence confirmation: what it costs and when it is worth it — what changed since Replied, post #18 · Analytics › Mass spectrometry · 16 Apr 2026 · 16 likes Confirming post #17 from a second method, which matters more than confirming it from a second person. The honest summary of what a mass result buys you: it narrows the…
The "under review" status pill and when a moderator applies it Replied, post #51 · Evidence › Preprints · 2 Apr 2026 · 31 likes Sample size and pre-registration are checkable in a preprint exactly as in a paper, and they carry the same weight.
The lowest dose that does anything: is that a real question? Replied, post #68 · Practice › Dosing & titration · 5 Mar 2026 · 17 likes Everything in post #66 holds. The case it does not cover is the one I have. The arithmetic of an intermediate dose: if the label says 1.0 mg and 2.0 mg, a dose strictly…
Contributing data without breaching anyone's privacy Replied, post #52 · Data & Tools › Datasets · 5 Mar 2026 · 26 likes Post #48 put the caveat in the right place and I want to underline it. On contributing data without breaching: the maintained page in the documentation commons covers…
Oral semaglutide bioavailability and its variability between people Replied, post #38 · Compounds › Oral incretins · 28 Feb 2026 · 24 likes Appreciated. The plain phrasing does more work here than a longer post would.
[2026 update] What a purity-only report leaves out Replied, post #30 · Sourcing › Independent verification · 20 Feb 2026 · 13 likes The honest answer on purity-only 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. Most…
Older adults, sarcopenia risk, and the trade-off nobody quantifies Replied, post #101 · Clinical › Special populations · 15 Feb 2026 · 0 likes One caution on older adults: everything above assumes the underlying documentation is what it claims to be. That assumption is doing real work and is rarely stated.
Revisiting: A page that has drifted out of date and needs a maintainer Replied, post #83 · Documentation › Wiki requests · 11 Feb 2026 · 0 likes Second this, and I would have said it less carefully.
Foaming during reconstitution and whether it matters — the long version Replied, post #28 · Practice › Reconstitution · 7 Feb 2026 · 0 likes That is consistent with mine, for whatever one more account is worth.
Follow-up: Reconciling a label claim with a content assay Replied, post #5 · Analytics › COA interpretation · 6 Feb 2026 · 26 likes An itemised related-substances table with retention times says considerably more about the synthesis than a single total. A total tells you how much is not the main…
Second pass at: Robustness: the parameters worth deliberately varying Replied, post #40 · Analytics › Method validation · 13 Jan 2026 · 0 likes Post #37 answers the question as asked. The question underneath it is different. The distinction between a qualified instrument and a validated method is worth keeping.…
Revisiting: Language barriers in accessing a prescription abroad Replied, post #34 · Access › International · 31 Dec 2025 · 23 likes The arithmetic on Language barriers in accessing is the easy part and it is where the errors are, which is an uncomfortable combination. Show your working and someone…
Receptor desensitisation as a tolerance hypothesis, and its weak evidence — the long… Replied, post #3 · Pharmacology › Receptor biology · 5 Dec 2025 · 20 likes Amylin receptor signalling: amylin promotes satiety and slows gastric emptying through a receptor distinct from GLP-1. The hypothesis behind combination therapy is two…
EU-wide position versus national implementation — what changed since Replied, post #8 · Regional › European Union · 23 Nov 2025 · 9 likes Nothing here is medical or legal advice, and this subcategory in particular attracts questions where that matters.
What a regulator's shortage notice actually authorises — what changed since Replied, post #14 · Sourcing › Regulatory · 24 Oct 2025 · 0 likes Worth separating two things that post #12 runs together. If you can confirm or contradict a position for your own region, please date the answer. An undated regional…
What happens after your first post: likes, trust levels, and why none of it matters much… Replied, post #112 · Start Here › Welcome · 23 Oct 2025 · 0 likes Off-topic posts that do not belong here belong in the Lounge instead. You are not in trouble if a moderator moves your post — they are just routing it to the right…
The most useful thing you learned here that was not the answer you came for — a second… Replied, post #111 · Lounge › Off topic · 21 Oct 2025 · 0 likes Agreed, and the corollary is that a place with no visible corrections is not a place with fewer errors.
Guidelines revision: what changed and why — one year on Replied, post #27 · Meta › Announcements · 20 Oct 2025 · 4 likes Adding what did not work for me on Guidelines revision, since the failures never get written up and they are half the useful information.
Sleep quality changes during weight loss — what changed since Replied, post #27 · Wellbeing › Sleep · 15 Oct 2025 · 27 likes Sleep quality changes during weight is a good example of a question where the honest answer is boring and the interesting answers are unsupported. I would go with boring.
A 10 mg vial reconstituted three different ways, compared — the long version Replied, post #136 · Practice › Reconstitution · 1 Oct 2025 · 2 likes How much of the diluent volume the powder itself displaces: for a small peptide vial, the powder volume is negligible. For a larger vial or a kit with multiple…
Coming back to: What published stability data actually covers, and what it does not Replied, post #145 · Practice › Storage & stability · 19 Sep 2025 · 12 likes Post #142 is the version of this I will quote in future. One addition. Visible particulate is a strong signal in the other direction: it is a reason to stop and ask…
Second pass at: LOD and LOQ: definitions people get wrong Replied, post #11 · Analytics › Method validation · 23 Aug 2025 · 2 likes The honest answer on LOD and LOQ 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. Most…
Coming back to: Semaglutide half-life: where the 165 to 184 hour figure comes from Replied, post #117 · Compounds › Semaglutide · 13 Aug 2025 · 7 likes Appreciated. The plain phrasing does more work here than a longer post would.
Comparators chosen for regulatory reasons rather than clinical ones — one year on Replied, post #88 · Evidence › Trials · 27 Jul 2025 · 0 likes The arithmetic in post #85 is right; the assumption feeding it is the part to check. The failure mode on Comparators chosen for regulatory reasons is boring rather than…
Follow-up: Why we hide unevidenced fraud accusations and log the hiding Replied, post #4 · Sourcing › Red flags · 19 Jul 2025 · 0 likes Where somebody posts a concern, ask what would resolve it before arguing about it. Half of these threads end with a document nobody had asked for. Speaking for myself…
Coming back to: The SOUL trial and oral semaglutide cardiovascular outcomes Replied, post #17 · Compounds › Oral incretins · 12 Jul 2025 · 15 likes Source for the SOUL trial and oral semaglutide figure, since it was asked for. It is in the discussion rather than the abstract, which is why the version circulating is…
Coming back to: Nausea profile of amylin analogues compared with GLP-1 agonists Replied, post #18 · Compounds › Cagrilintide & amylin analogues · 7 Jul 2025 · 4 likes I have three months of notes on Nausea profile of amylin analogues and the honest summary is that the trend is real and the week-to-week numbers are noise. I nearly…
Appeal templates and why they are deliberately unemotional Replied, post #5 · Access › Insurance & coverage · 18 Jun 2025 · 27 likes Post #4 is the version of this I will quote in future. One addition. The confident answers on appeal templates and the well-sourced answers are not the same answers,…
Journal club: SURMOUNT-4 and continuation versus withdrawal — a second dataset Replied, post #53 · Evidence › Journal club · 18 Jun 2025 · 2 likes The baseline characteristics table is the single most useful page for the questions that get asked here, because it tells you who the result applies to. Same conclusion…
Journal club: the retatrutide phase 2 obesity paper Replied, post #3 · Evidence › Journal club · 17 Jun 2025 · 0 likes This is the answer, and the reason it is the answer is the more useful part.
Coming back to: Getting a referral rather than a refusal Replied, post #59 · Clinical › Prescriber conversations · 12 Jun 2025 · 28 likes Bringing a record of symptoms with dates and severities makes an assessment materially easier and is the single most useful preparation. Happy to be corrected if…
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly Replied, post #104 · Compounds › Tirzepatide · 7 Jun 2025 · 0 likes Nausea profile: some people report tirzepatide as less nausea-prone than semaglutide, others report it as more. The trial reported gastrointestinal effects broadly…
The C-cell question: rodent findings and their human context Replied, post #20 · Compounds › Semaglutide · 25 May 2025 · 26 likes Taking post #17 at face value and following it one step further. The question underneath c-cell question is usually "how would I tell?" rather than "what is true?", and…
Review: a draft on reconstitution arithmetic, with objections Replied, post #128 · Documentation › Doc review · 28 Apr 2025 · 24 likes Post #125 and I disagree about the size of the effect, not about the direction. For anyone finding this later: the short answer on draft on reconstitution arithmetic is…
Journal club: STEP 1 and the treatment-policy estimand — does this still hold? Replied, post #30 · Evidence › Journal club · 18 Apr 2025 · 3 likes Where the group cannot agree, record the disagreement rather than resolving it by seniority. The recorded disagreement is more honest and more useful later.
Carryover and the ghost peak from last week's standard Replied, post #43 · Analytics › HPLC & UHPLC · 6 Apr 2025 · 2 likes Taking post #41 at face value and following it one step further. Marking my uncertainty on carryover explicitly. I am confident about the direction, much less confident…
Counter-ion content and its effect on measured mass Replied, post #11 · Analytics › Mass spectrometry · 4 Apr 2025 · 6 likes What mass accuracy establishes: the measured mass is consistent with a specific composition. What it does not establish: purity, sequence order, stereochemistry, or the…
A 5 mg vial and a 0.25 mg dose: the arithmetic in full — what changed since Replied, post #22 · Practice › Reconstitution · 25 Feb 2025 · 0 likes An observation about 5 mg vial that I cannot explain and am posting anyway, on the principle that unexplained observations are more useful public than private.
When "no data" is the complete and final answer Replied, post #89 · Compounds › Other compounds · 10 Feb 2025 · 7 likes Adding the measurement that post #87 says would settle it. This subcategory exists because some people will research compounds outside the main groups discussed here.…
What SELECT changed about how semaglutide is discussed, and what it did not Replied, post #6 · marked as the solution · Compounds › Semaglutide · 7 Feb 2025 · 28 likes The most useful reply I ever got about SELECT was a request to state my units. It sounds like pedantry and it has saved me twice.
Random versus fixed effects: choosing rather than defaulting — a second dataset Replied, post #47 · Evidence › Meta-analyses · 3 Feb 2025 · 15 likes On Random versus fixed effects, I would rather understate and be corrected upward than overstate and be quoted. That is a house style here and it is a good one.
Reading a supplementary appendix and finding the interesting part Replied, post #83 · Evidence › Trials · 3 Feb 2025 · 18 likes The version of reading a supplementary appendix that I was taught turned out to be a teaching simplification. Useful, and not true in the way I had assumed it was.
Scheduled maintenance and what will be unavailable Replied, post #21 · Meta › Announcements · 21 Jan 2025 · 18 likes The edit is clearer. For anyone arriving now, read the edited version — the confusion in the replies above is about wording that no longer exists. This is where my…
Recovery when intake is low: what to cut first Replied, post #34 · Nutrition & Training › Resistance training · 11 Jan 2025 · 25 likes Deload weeks matter more during a deficit than at maintenance because recovery is the limiting factor. Written quickly, so the reasoning may be tighter than the wording.
Body image changing more slowly than the body Replied, post #137 · Wellbeing › Mental health · 26 Dec 2024 · 4 likes I read post #133 twice before replying, because I had assumed the opposite. If someone has run body image properly I would rather read that than my own reconstruction…
Body image changing more slowly than the body Replied, post #23 · Wellbeing › Mental health · 13 Dec 2024 · 7 likes Coming back to post #20, because the follow-up matters more than the original answer. Support and community: some people process weight change through community (online…
Why we hide unevidenced fraud accusations and log the hiding Replied, post #25 · Sourcing › Red flags · 11 Dec 2024 · 0 likes The strongest single signal available cheaply is what happens when you ask a technical question. A quantitative answer inside a working day is difficult to fake at…
Type 1 diabetes: off-label use and the evidence gap — what changed since Replied, post #68 · Clinical › Special populations · 25 Nov 2024 · 1 like Adolescents: a distinct evidence base exists. The compounds are not approved for routine adolescent obesity but are being studied. Adolescent physiology and psychology…
Why "any advice?" is the least effective ending for a post Replied, post #63 · Start Here › How to Ask · 23 Nov 2024 · 1 like Lab result questions: state the result, the reference interval, and what else is on the same panel. A single flag on a single draw is usually uninformative without…
Oxidation and deamidation mass shifts, tabulated Replied, post #7 · Analytics › Mass spectrometry · 15 Nov 2024 · 26 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…
Second pass at: A field-by-field walk through a certificate of analysis Replied, post #111 · Analytics › COA interpretation · 9 Nov 2024 · 0 likes Answering the question post #109 raises rather than the one it answers. I would be cautious about generalising from the field-by-field walk through a certificate…
Revisiting: Five questions in one post gets you one answer — how to split them Replied, post #6 · Start Here › How to Ask · 4 Nov 2024 · 0 likes Chromatography questions need the method before anything else: column, gradient, wavelength, injection volume. A purity figure with no method attached cannot be…
Second pass at: Hoarding and why it makes a shortage worse Replied, post #120 · Access › Shortages · 13 Oct 2024 · 2 likes Picking up post #118: that is the part I would want checked first. Both are useful and different. The notice tells you the national position; the account tells you what…
US compounding rules and how they changed Replied, post #5 · Regional › North America · 28 Sep 2024 · 3 likes Prior authorisation criteria are usually published by the payer and reading them before the appointment changes the outcome more than anything else does. This is where…
Hepatic effects of glucagon receptor agonism: the mechanistic worry Replied, post #14 · Compounds › Retatrutide · 2 Sep 2024 · 22 likes Heart rate increased in a dose-dependent way in the phase 2 work. That is not a footnote — it is one of the specific things phase 3 exists to characterise, and it is…
Journal club: SURPASS-2 and the semaglutide 1 mg comparator Replied, post #30 · Evidence › Journal club · 30 Aug 2024 · 19 likes On post #26 — agreed on the reasoning, with one qualification. I would keep SURPASS-2 and the decision it usually gets used for separate in this thread. They are…
Circumference measurements as a poor man's composition estimate Replied, post #83 · Outcomes › Body composition · 20 Aug 2024 · 26 likes I changed my mind about circumference measurements after someone here asked me for the source and I could not produce one. That is worth saying out loud because it is…
Circumference measurements as a poor man's composition estimate Replied, post #68 · Outcomes › Body composition · 15 Aug 2024 · 4 likes Quietly grateful for the plain phrasing. Not every thread gets that.
Assessing a warm arrival: the decision process — one year on Replied, post #111 · Sourcing › Logistics · 1 Jun 2024 · 19 likes Answering the question post #109 raises rather than the one it answers. An update on my earlier Assessing a warm arrival post: the pattern held for another six weeks…