m.kjaer

TL2 · Haarlem

Contributes reviews on supplier material. Based in Haarlem.

Joined 20 July 2025 · last posted 2d

73 posts, newest first. Showing up to 150.

[2026 update] Detection wavelength and why 214 nm and 280 nm disagree Replied, post #70 · Analytics › HPLC & UHPLC · 25 Jul 2026 · 0 likes That is the distinction I keep failing to hold on to. Written down now.
Insomnia at a dose step: reported experiences — the long version Replied, post #43 · Wellbeing › Sleep · 6 Jul 2026 · 0 likes Careful with the language on Insomnia. "Not detected" and "not present" are different findings and the first is a statement about the method.
Coming back to: Payment method and the leverage it gives you, ranked Replied, post #13 · Sourcing › Payments · 1 Jul 2026 · 1 like Whatever the answer on Payment method turns out to be, the method for getting there is the same: state the assumption, do the arithmetic in public, invite the correction.
Shakes versus food: a pragmatic assessment Replied, post #20 · Nutrition & Training › Protein & intake · 29 Jun 2026 · 1 like Post #18 describes the usual case. This is about the unusual one. Careful with the language on shakes versus food. "Not detected" and "not present" are different…
Asking a follow-up: new topic or new reply? Replied, post #21 · Start Here › How to Ask · 23 Jun 2026 · 21 likes Picking up post #18: that is the part I would want checked first. Asking a follow-up is well covered in the tag pages, and the older discussions are better than the…
Semaglutide and gastric emptying — the mechanism behind most of the side-effect profile Replied, post #69 · Compounds › Semaglutide · 19 Jun 2026 · 3 likes Semaglutide and gastric emptying looks different depending on whether you are reading the primary literature or the summaries of it, and the difference is not in our…
Forced degradation studies: designing one that is informative Replied, post #78 · Analytics › Method validation · 16 Jun 2026 · 0 likes Specificity is the first question: does the method separate the analyte from everything reasonably expected to be present? A method that has not been challenged with…
Second pass at: When your prescriber and the evidence disagree Replied, post #35 · Clinical › Prescriber conversations · 13 Jun 2026 · 12 likes A question phrased as "what would you want to see before considering X" is answerable and is not a request for X.
[2026 update] Interpreting a result that disagrees with the supplier's certificate Replied, post #16 · Sourcing › Independent verification · 13 Jun 2026 · 24 likes Adding the measurement that post #15 says would settle it. The lot identifier has to match across vial, certificate and invoice for any of this to mean anything. It is…
Peak-to-trough ratio at steady state for a weekly agent — the long version Replied, post #24 · Pharmacology › Pharmacokinetics · 13 Jun 2026 · 0 likes This follows post #21 rather than contradicting it. The number people quote for Peak-to-trough ratio is a central estimate presented without its interval, and the…
Micronutrient adequacy at low total intake Replied, post #72 · Nutrition & Training › Protein & intake · 12 Jun 2026 · 0 likes Two questions I would want answered before drawing anything from the micronutrient adequacy data above: how were the cases selected, and what happened to the ones that…
A reconstituted vial's beyond-use date and the reasoning behind common figures Replied, post #94 · Practice › Storage & stability · 8 Jun 2026 · 8 likes Since reconstituted 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 direct…
A certificate whose chromatogram axes do not match its stated method — one year on Replied, post #68 · Sourcing › Red flags · 5 Jun 2026 · 5 likes Prices well below the rest of the market are a fact rather than a finding. They are worth noting and they do not establish anything on their own. That is the version I…
Batch numbers that do not match the vial label — what changed since Replied, post #26 · Sourcing › Red flags · 31 May 2026 · 0 likes Patterns that reliably precede a problem: underdosing (less active material than stated, documented by independent testing), mislabelling (wrong compound, wrong…
Reading a trial's population section before its results Replied, post #57 · Evidence › Trials · 26 May 2026 · 18 likes A treatment-policy estimand asks what happens to people assigned to a strategy, including those who abandon it. A hypothetical estimand asks what would have happened…
Second pass at: The storage lookup and where its data comes from Replied, post #22 · Data & Tools › Calculators · 26 May 2026 · 0 likes On post #18 — agreed on the reasoning, with one qualification. Rounding behaviour is where two tools disagree. One rounding to the nearest graduation and one to two…
Journal club: indirect comparison between two programmes, defended and attacked Replied, post #67 · Evidence › Journal club · 25 May 2026 · 8 likes On post #65 — agreed on the reasoning, with one qualification. Where the group cannot agree, record the disagreement rather than resolving it by seniority. The recorded…
Pancreatitis history and the risk calculus Replied, post #13 · Safety › Contraindications · 25 May 2026 · 0 likes Everything in post #9 holds. The case it does not cover is the one I have. Pancreatitis history is well covered in the tag pages, and the older discussions are better…
Second pass at: A pooled estimate that changed when one trial was added Replied, post #11 · Evidence › Meta-analyses · 23 May 2026 · 0 likes When trials differ in population, duration and comparator, the pooled estimate answers a question no individual trial asked. That is worth saying before the number is…
Second pass at: Which categories are strict and which are relaxed, honestly Replied, post #61 · Start Here › Welcome · 22 May 2026 · 20 likes The Lounge is a real category rather than a dumping ground. The sourcing rule still applies there, which surprises people, but the register is looser and nobody minds a…
Private prescribing in the UK: what is actually involved Replied, post #14 · Regional › UK & Ireland · 13 May 2026 · 5 likes What I can speak to on private prescribing is narrow, so I will keep it narrow rather than generalising from it. Beyond that boundary I do not know.
Coming back to: Swirling versus inverting versus leaving it alone Replied, post #12 · Practice › Reconstitution · 5 May 2026 · 8 likes I had written a reply contradicting post #8 and deleted it. Here is what survived. I would be cautious about generalising from the Swirling versus inverting versus…
Follow-up: A parcel that arrived warm: a decision process, not a verdict Replied, post #4 · Practice › Storage & stability · 23 Apr 2026 · 29 likes Visible particulate is a strong signal in the other direction: it is a reason to stop and ask rather than to filter and proceed. It reads as pedantry until the day it…
List price versus negotiated price versus what you pay Replied, post #66 · Access › Pricing · 13 Apr 2026 · 13 likes A cheaper option that arrives slowly has a cost in the form of running out, and people rarely price that.
[2026 update] Currency conversion and the cost you did not see Replied, post #14 · Sourcing › Payments · 4 Apr 2026 · 0 likes Post #13 is the version of this I will quote in future. One addition. Reading this Currency conversion thread as someone who came in with a fixed view: the third and…
Journal club: orforglipron phase 2 and the non-peptide question Replied, post #28 · Evidence › Journal club · 31 Mar 2026 · 0 likes Post #25 is right about the mechanism and I think understates the practical bit. On orforglipron phase 2, the part that usually goes wrong is that the question is asked…
[2026 update] 0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Started this topic · Devices › Syringes & needles · 30 Mar 2026 · 42 likes On the subject in the title: 0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Working notes rather than a conclusion. A follow-up question about 0.3 ml…
Nausea profile of amylin analogues compared with GLP-1 agonists Replied, post #38 · Compounds › Cagrilintide & amylin analogues · 3 Mar 2026 · 10 likes Gastric emptying: both amylin and GLP-1 slow it, through partly overlapping but distinct mechanisms. Whether the slowing at a higher magnitude produces disproportionate…
Revisiting: Maintainer handover: how it works Replied, post #13 · Meta › Wiki maintenance · 23 Feb 2026 · 12 likes Evidence synthesis: if you think a page should cover recent evidence or a new development, suggesting specific content helps the maintainer prioritise updates.
Older adults, sarcopenia risk, and the trade-off nobody quantifies Replied, post #80 · Clinical › Special populations · 20 Jan 2026 · 5 likes My experience of older adults 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.
Angle of injection and whether 90 degrees is always right Replied, post #83 · Practice › Administration · 15 Jan 2026 · 14 likes An honest declaration on angle of injection: I have a prior here and it is strong enough that you should weight what I say downward. Stating it rather than hiding it.
A history of disordered eating: proceeding carefully Replied, post #62 · Wellbeing › Mental health · 15 Jan 2026 · 11 likes Support and community: some people process weight change through community (online or in-person). Others prefer privacy. Knowing what you need and seeking it…
Reconstitution volumes that produce round numbers, tabulated Replied, post #18 · Practice › Reconstitution · 2 Jan 2026 · 11 likes Practical answer on reconstitution volumes, since the theoretical one is upthread: do the simplest check first, write down the result, and only then decide whether the…
The headache that turns out to be dehydration Replied, post #119 · Nutrition & Training › Hydration & electrolytes · 1 Jan 2026 · 0 likes On headache, 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.
Second pass at: What "verified" means on our vendor pages, stated narrowly Replied, post #52 · Sourcing › Vendor reports · 1 Jan 2026 · 0 likes Do not adjust a reported figure. Post what the laboratory said and put your interpretation in a separate sentence. That is what I would do. It may not be what is correct.
Vomiting: when it is expected and when it is a reason to stop Replied, post #89 · Practice › Side effects · 29 Dec 2025 · 21 likes Vomiting: when it is expected (first-dose reactions or early titration) and when it is a reason to stop and seek help are different. Occasional vomiting during…
DXA precision and the least significant change for lean mass Replied, post #62 · Outcomes › Body composition · 12 Dec 2025 · 0 likes I had written a reply contradicting post #61 and deleted it. Here is what survived. I would rather this thread reach "we do not know" about DXA precision than reach a…
Why an oral GLP-1 agonist is a formulation achievement more than a chemistry one Replied, post #85 · Compounds › Oral incretins · 11 Dec 2025 · 2 likes The class is broadening fast enough that anything written here about which orals exist is dated within a year. The mechanisms and the formulation constraints age much…
Citation sweep results: how many references did not say what was claimed Replied, post #15 · Meta › Wiki maintenance · 9 Dec 2025 · 19 likes An observation about citation sweep results that I cannot explain and am posting anyway, on the principle that unexplained observations are more useful public than…
How to read a phase 2 result without treating it as a phase 3 result Replied, post #19 · Compounds › Retatrutide · 7 Dec 2025 · 1 like Post #16 is right about the mechanism and I think understates the practical bit. Why this subcategory is more cautious than elsewhere: retatrutide is investigational,…
Sequence verification for an obscure compound: how it is done — what changed since Replied, post #74 · Compounds › Other compounds · 25 Nov 2025 · 8 likes Small methodological point on Sequence verification: repeating a measurement is cheap and resolves most of what is being argued about here at no cost to anyone.
Documentation that materially improves an appeal's chances Replied, post #75 · Access › Insurance & coverage · 23 Nov 2025 · 0 likes Reimbursement changes: a compound covered one year might not be the next. A formulary decision in January can change by April. Checking again before refilling saves…
A genuinely late dose: what the labelling says and what people do — what changed since Replied, post #5 · Practice › Administration · 16 Nov 2025 · 1 like No disagreement from me. Posting only so the question does not look ignored.
How the vendor documentation pages are maintained, and by whom — what changed since Replied, post #92 · Sourcing › Vendor reports · 15 Nov 2025 · 8 likes Multiple services on one lot: agreement across two independent laboratories is stronger than a high number from one. Our vendor pages deliberately mix services for that…
How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ — a second dataset Replied, post #5 · Sourcing › Independent verification · 26 Oct 2025 · 11 likes I had written a reply contradicting the opening post and deleted it. Here is what survived. Medutest: combined purity and identity reporting. Appears throughout vendor…
Payment mechanics and the recovery options that do not exist Replied, post #72 · Sourcing › Payments · 22 Oct 2025 · 1 like Post #70 put the caveat in the right place and I want to underline it. Chargeback reality: if you pay by credit card and the supplier does not deliver, you can attempt…
Substitution between formats during a shortage Replied, post #72 · Access › Shortages · 10 Oct 2025 · 18 likes Counterpoint on substitution between formats, offered without confidence: the same observation is consistent with a much duller explanation, and nobody has ruled the…
Cagrilintide's dosing interval and the pharmacokinetics behind it Replied, post #61 · Compounds › Cagrilintide & amylin analogues · 4 Oct 2025 · 18 likes The monoisotopic mass sits near 3749.9 Da, and the same caveat applies as everywhere else: a mass consistent with the proposed structure is a necessary condition and…
Compounds this community declines to help with, and why Started this topic · Compounds › Other compounds · 22 Sep 2025 · 60 likes Compounds this community declines to help with, and why — setting out what I have, and where I think it stops being reliable. Putting the numbers in the first post,…
Titles that describe the question, not the situation — what changed since Replied, post #33 · Start Here › How to Ask · 21 Sep 2025 · 11 likes Coming back to post #31, because the follow-up matters more than the original answer. Two people in this thread mean different things by Titles and are disagreeing…
Comparing my trajectory with the trial curves, carefully Replied, post #38 · Outcomes › Progress reports · 20 Aug 2025 · 2 likes If a pattern survives a rolling-mean treatment it is worth explaining. Most do not, and that is the useful finding.
Reading a supplier's product description as a marketing document Replied, post #56 · Compounds › Other compounds · 11 Aug 2025 · 0 likes Reading a supplier's product description as a marketing document: that is exactly what it is. The hyperbole, the mechanism written as fact, the theoretical benefits…
How to research a compound with no human data without deceiving yourself Replied, post #57 · Compounds › Other compounds · 2 Aug 2025 · 1 like Distinguishing three things in the research a compound discussion that keep getting used interchangeably: the observation, the proposed mechanism, and the…
A ten-fold dose error caught before injection — one year on Replied, post #26 · Devices › Syringes & needles · 1 Aug 2025 · 9 likes Insulin syringe graduations: U-100 syringes are marked in units where 100 units = 1 mL. Always confirm your syringe is U-100. Confusion between insulin units and…
Temperature loggers worth the money Replied, post #13 · Devices › Cold chain · 28 Jul 2025 · 20 likes Post #12 answers the question as asked. The question underneath it is different. For anyone finding this later: the short answer on temperature loggers worth the money…
When a preprint is the best available evidence and we say so Replied, post #3 · Evidence › Preprints · 27 Jul 2025 · 15 likes The arithmetic in the opening post is right; the assumption feeding it is the part to check. Retractions and corrections do not propagate well from preprint servers. A…
Coming back to: Semaglutide half-life: where the 165 to 184 hour figure comes from Replied, post #69 · Compounds › Semaglutide · 14 Jul 2025 · 0 likes Answering the question post #65 raises rather than the one it answers. On the injection-day question: the labelling for licensed semaglutide allows the day to be…
Triple agonism: additive, synergistic, or neither? Replied, post #65 · Compounds › Retatrutide · 7 Jul 2025 · 0 likes Helpful, and short, which on this subject is harder than long.
The CagriSema phase 2 paper and what a fixed combination buys — the long version Replied, post #78 · Compounds › Cagrilintide & amylin analogues · 12 Jun 2025 · 18 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…
Second pass at: How to research a compound with no human data without deceiving yourself Replied, post #62 · Compounds › Other compounds · 4 Jun 2025 · 16 likes Adding a data point of agreement rather than a data point.
Half-life, steady state, and accumulation worked through Replied, post #49 · Pharmacology › Pharmacokinetics · 1 Jun 2025 · 0 likes Where I part company with post #47, and it is a narrow parting. I changed my mind about half-life after someone here asked me for the source and I could not produce…
A well-designed study with a badly written abstract Replied, post #6 · Evidence › Study critique · 2 Apr 2025 · 0 likes The pre-specified endpoint being a weaker proxy than you would like is a real criticism. It is a smaller one than saying the result was chosen after the fact.
Charge states for a 4 kDa peptide, worked through Replied, post #96 · Analytics › Mass spectrometry · 13 Mar 2025 · 4 likes Picking up post #95: that is the part I would want checked first. Charge states: I would want to see the raw numbers rather than the summary before agreeing. Summaries…
Criticising the method without criticising the authors Replied, post #40 · Evidence › Study critique · 16 Feb 2025 · 2 likes The strongest critiques cite the section they rely on. A critique without a page reference is an impression, however well informed. That is the practical version. The…
Canadian access and provincial variation Replied, post #61 · Regional › North America · 6 Feb 2025 · 3 likes Worth stating the null on canadian access and provincial variation before we explain it: the observation may be nothing. That possibility deserves a sentence and…
Protein density versus volume when you cannot eat much Replied, post #19 · Nutrition & Training › Protein & intake · 26 Jan 2025 · 33 likes On post #15 — agreed on the reasoning, with one qualification. Meeting protein targets on suppressed appetite: this is where the practical difficulty lies. Eating more…
Body image changing more slowly than the body Replied, post #20 · Wellbeing › Mental health · 12 Dec 2024 · 3 likes Where the body image 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 sentence with…
Research-use-only labelling: what it means and what it does not — the long version Replied, post #34 · Sourcing › Regulatory · 27 Nov 2024 · 26 likes Nothing in this subcategory is legal advice, and the members who work in regulated environments are the most careful to say so. Anyone who has looked at this more…
TB-500 and thymosin beta-4: the fragment versus the protein — does this still hold? Replied, post #8 · Compounds › Repair & healing peptides · 26 Nov 2024 · 5 likes TB-500 and thymosin beta-4: I have looked for the primary source twice and failed twice. Either it does not exist or it is somewhere I do not know to look, and I would…
US compounding rules and how they changed Replied, post #31 · Regional › North America · 19 Oct 2024 · 0 likes That reframing is the whole thing. The facts I already had.
Hypertension improvement and when medication needs revisiting — a second dataset Replied, post #31 · Clinical › Comorbidities · 14 Oct 2024 · 4 likes Hypertension improvement is one of those subjects where the general answer and the answer for a specific case diverge, and the thread will go in circles until someone…
High-resolution MS on aggregates and what it can see — one year on Replied, post #59 · Analytics › Mass spectrometry · 22 Aug 2024 · 23 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…
How this community labels and discusses unrefereed work Replied, post #53 · Evidence › Preprints · 1 Jul 2024 · 0 likes Post #49 describes the usual case. This is about the unusual one. Speaking only to community labels as I have actually seen it, rather than as it is usually described:…