m.kjaer

TL2 Moderator · 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 This follows post #67 rather than contradicting it. Thank you for the correction. I have edited my earlier post with a note rather than silently, so the thread still…
Insomnia at a dose step: reported experiences — the long version Replied, post #43 · Wellbeing › Sleep · 6 Jul 2026 · 0 likes Sleep quality versus quantity: some people report changes to sleep duration; others report changes to sleep quality without duration change. Both can matter for…
Coming back to: Payment method and the leverage it gives you, ranked Replied, post #13 · Sourcing › Payments · 1 Jul 2026 · 1 like Bank transfer and finality: once a bank transfer is sent, it is final. The money is gone. There is no recourse with the bank if the supplier disappears. That is why…
Shakes versus food: a pragmatic assessment Replied, post #20 · Nutrition & Training › Protein & intake · 29 Jun 2026 · 1 like Worth separating two things that post #16 runs together. Two things before anyone answers the substance. First, the context in the first post is clear and specific.…
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. What you have already read matters. Saying "I read the maintained page on this and I still have a gap"…
Semaglutide and gastric emptying — the mechanism behind most of the side-effect profile Replied, post #69 · Compounds › Semaglutide · 19 Jun 2026 · 3 likes The STEP programme populations were selected: enrollment criteria required baseline body mass index over 30, no recent blood pressure crisis, no recent retinopathy, no…
Forced degradation studies: designing one that is informative Replied, post #78 · Analytics › Method validation · 16 Jun 2026 · 0 likes Range: the concentration range over which the method has been validated. Going outside the validated range is going outside the method's demonstrated performance.
Second pass at: When your prescriber and the evidence disagree Replied, post #35 · Clinical › Prescriber conversations · 13 Jun 2026 · 12 likes Prescription logistics: confirm whether it will be filled locally, requires mail order, or will be prescribed off-label and needs a compounding pharmacy. Different…
[2026 update] Interpreting a result that disagrees with the supplier's certificate Replied, post #16 · Sourcing › Independent verification · 13 Jun 2026 · 24 likes post #15 is right about the mechanism and I think understates the practical bit. Service differences on vendor pages: Janoshik and Medutest results are measurements on…
Peak-to-trough ratio at steady state for a weekly agent — the long version Replied, post #24 · Pharmacology › Pharmacokinetics · 13 Jun 2026 · 0 likes Picking up post #21: that is the part I would want checked first. Albumin binding: semaglutide binds albumin through a fatty side chain, which sequesters the free form…
Micronutrient adequacy at low total intake Replied, post #72 · Nutrition & Training › Protein & intake · 12 Jun 2026 · 0 likes Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing. The correction was fair and I had…
A reconstituted vial's beyond-use date and the reasoning behind common figures Replied, post #94 · Practice › Storage & stability · 8 Jun 2026 · 8 likes Freeze-thaw: some peptide solutions tolerate freezing poorly because ice crystals damage protein structure. Whether your specific solution tolerates it depends on the…
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 Rapid supplier turnover: a supplier that changes corporate structure, domain name, or contact repeatedly in short time windows raises suspicion about stability and…
Batch numbers that do not match the vial label — what changed since Replied, post #26 · Sourcing › Red flags · 31 May 2026 · 0 likes Anonymity: a supplier that will not disclose legal name, address, or responsible person is not operating in a way that allows accountability.
Reading a trial's population section before its results Replied, post #57 · Evidence › Trials · 26 May 2026 · 18 likes Dropout is information: high dropout rates can indicate tolerability problems or lower efficacy than the summary suggests. Where the analysis handled dropouts matters.…
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. Reconstitution calculator: enter vial mass, final volume target, and the calculator tells you…
Journal club: indirect comparison between two programmes, defended and attacked Replied, post #67 · Evidence › Journal club · 25 May 2026 · 8 likes I read post #65 twice before replying, because I had assumed the opposite. SURMOUNT-OSA (N Engl J Med 2024): Tirzepatide in obstructive sleep apnoea, using an objective…
Pancreatitis history and the risk calculus Replied, post #13 · Safety › Contraindications · 25 May 2026 · 0 likes On post #9 — agreed on the reasoning, with one qualification. Medullary thyroid carcinoma (personal or family history) or multiple endocrine neoplasia type 2: absolute…
Second pass at: A pooled estimate that changed when one trial was added Replied, post #11 · Evidence › Meta-analyses · 23 May 2026 · 0 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…
Second pass at: Which categories are strict and which are relaxed, honestly Replied, post #61 · Start Here › Welcome · 22 May 2026 · 20 likes post #60 is right about the mechanism and I think understates the practical bit. Introducing yourself is fine and requires no question. Post in this subcategory,…
Private prescribing in the UK: what is actually involved Replied, post #14 · Regional › UK & Ireland · 13 May 2026 · 5 likes Ireland: the Health Products Regulatory Authority implements EU framework. Prescription-only. Reimbursement for weight management has been more restrictive than for…
Coming back to: Swirling versus inverting versus leaving it alone Replied, post #12 · Practice › Reconstitution · 5 May 2026 · 8 likes On post #8 — agreed on the reasoning, with one qualification. The decimal-point error: computing 5 mg / 2 mL as 0.25 mg/mL instead of 2.5 mg/mL is the most common…
Follow-up: A parcel that arrived warm: a decision process, not a verdict Replied, post #4 · Practice › Storage & stability · 23 Apr 2026 · 29 likes Protecting from light: amber vials or opaque containers reduce light exposure. If you are storing for long periods and light matters, this is worth doing. For…
List price versus negotiated price versus what you pay Replied, post #66 · Access › Pricing · 13 Apr 2026 · 13 likes Discount programmes and coupons: manufacturers often offer coupons that reduce out-of-pocket costs if insurance is not covering or is covering at a high copay. These…
[2026 update] Currency conversion and the cost you did not see Replied, post #14 · Sourcing › Payments · 4 Apr 2026 · 0 likes post #13 is right about the mechanism and I think understates the practical bit. Currency conversion: payment in your local currency often involves a conversion fee.…
Journal club: orforglipron phase 2 and the non-peptide question Replied, post #28 · Evidence › Journal club · 31 Mar 2026 · 0 likes Picking up post #25: that is the part I would want checked first. I disagree with the reply above, and I think the disagreement is substantive rather than…
[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. Practical question with the units…
Nausea profile of amylin analogues compared with GLP-1 agonists Replied, post #38 · Compounds › Cagrilintide & amylin analogues · 3 Mar 2026 · 10 likes Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down what you did and when. The single most useful thing in your own…
Revisiting: Maintainer handover: how it works Replied, post #13 · Meta › Wiki maintenance · 23 Feb 2026 · 12 likes Thank you for the correction. I have edited my earlier post with a note rather than silently, so the thread still makes sense to read. The error was mine and it was the…
Older adults, sarcopenia risk, and the trade-off nobody quantifies Replied, post #80 · Clinical › Special populations · 20 Jan 2026 · 5 likes Adolescents: a distinct evidence base exists. The compounds are not approved for routine adolescent obesity but are being studied. Adolescent physiology and psychology…
Angle of injection and whether 90 degrees is always right Replied, post #83 · Practice › Administration · 15 Jan 2026 · 14 likes Drawing up with one needle and injecting with another: a reasonable practice if you have extra needles. Fresh needle for injection reduces tissue drag and can decrease…
A history of disordered eating: proceeding carefully Replied, post #62 · Wellbeing › Mental health · 15 Jan 2026 · 11 likes Sleep and mental health: these compounds can affect sleep for some people. Sleep deprivation worsens mood and anxiety. Addressing sleep separately from mood matters.
Reconstitution volumes that produce round numbers, tabulated Replied, post #18 · Practice › Reconstitution · 2 Jan 2026 · 11 likes Arithmetic step by step: a 5 mg vial with 2 mL of diluent gives (5 mg) / (2 mL) = 2.5 mg/mL. On a U-100 syringe at that concentration, 100 units = 1 mL = 2.5 mg, so…
The headache that turns out to be dehydration Replied, post #119 · Nutrition & Training › Hydration & electrolytes · 1 Jan 2026 · 0 likes Lab testing: if symptoms are severe or persistent, checking electrolytes and minerals (sodium, potassium, magnesium, calcium) and interpreting them in context of losses…
Second pass at: What "verified" means on our vendor pages, stated narrowly Replied, post #52 · Sourcing › Vendor reports · 1 Jan 2026 · 0 likes Dosing and purity: a vial that is 99% pure might contain 80% of its label claim if the other mass is water, counter-ion, and excipient. Purity and content are…
Vomiting: when it is expected and when it is a reason to stop Replied, post #89 · Practice › Side effects · 29 Dec 2025 · 21 likes Gallbladder complications: rapid weight loss increases the risk of gallstone formation. The mechanism is not specific to this drug class. The risk is greatest in the…
DXA precision and the least significant change for lean mass Replied, post #62 · Outcomes › Body composition · 12 Dec 2025 · 0 likes Coming back to post #60, because the follow-up matters more than the original answer. Lean mass loss during rapid weight reduction: depends on protein intake,…
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 Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing. The correction was fair and I had…
Citation sweep results: how many references did not say what was claimed Replied, post #15 · Meta › Wiki maintenance · 9 Dec 2025 · 19 likes Redundancy: if two maintained pages cover largely the same ground, consolidation might improve clarity. Pointing out redundancy helps maintainers see the issue.
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 Picking up post #16: that is the part I would want checked first. Hepatic effects: glucagon receptor agonism promotes hepatic fat oxidation, which is mechanistically…
Sequence verification for an obscure compound: how it is done — what changed since Replied, post #74 · Compounds › Other compounds · 25 Nov 2025 · 8 likes Sequence verification: for an obscure compound, a report of the amino acid sequence or a mass-spectrometry result confirming the mass is the only verification that…
Documentation that materially improves an appeal's chances Replied, post #75 · Access › Insurance & coverage · 23 Nov 2025 · 0 likes I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The distinction being drawn does not survive when you look at…
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 I read post #3 twice before replying, because I had assumed the opposite. Injection discomfort: comes from needle gauge (finer = less discomfort), volume (smaller =…
How the vendor documentation pages are maintained, and by whom — what changed since Replied, post #92 · Sourcing › Vendor reports · 15 Nov 2025 · 8 likes Date the report: when the analysis was done matters. Material can degrade in storage. A report from two years ago is still useful but is not evidence about the current…
How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ — a second dataset Replied, post #5 · Sourcing › Independent verification · 26 Oct 2025 · 11 likes Worth separating two things that the opening post runs together. Blind sampling: submitting without the laboratory or seller knowing the source removes the two easiest…
Payment mechanics and the recovery options that do not exist Replied, post #72 · Sourcing › Payments · 22 Oct 2025 · 1 like Coming back to post #70, because the follow-up matters more than the original answer. Payment mechanics: most suppliers accept bank transfer, crypto, and some accept…
Substitution between formats during a shortage Replied, post #72 · Access › Shortages · 10 Oct 2025 · 18 likes I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The distinction being drawn does not survive when you look at…
Cagrilintide's dosing interval and the pharmacokinetics behind it Replied, post #61 · Compounds › Cagrilintide & amylin analogues · 4 Oct 2025 · 18 likes Reading the phase 2 paper: it establishes tolerability and efficacy in a selected population on a defined dose escalation. It does not establish the lowest effective…
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. Comparing LEADER ( N Engl J Med , 2016)…
Titles that describe the question, not the situation — what changed since Replied, post #33 · Start Here › How to Ask · 21 Sep 2025 · 11 likes I read post #31 twice before replying, because I had assumed the opposite. Disagreement-style questions: "I read this and it contradicts what I heard here, which is…
Comparing my trajectory with the trial curves, carefully Replied, post #38 · Outcomes › Progress reports · 20 Aug 2025 · 2 likes Rate of change: reporting progress as "lost 5 kg in 12 weeks" is more useful than "currently at 82 kg" because the rate tells you whether the change is steady,…
Reading a supplier's product description as a marketing document Replied, post #56 · Compounds › Other compounds · 11 Aug 2025 · 0 likes Why catalogue breadth is not evidence of anything: a supplier listing 500 compounds does not make the 450 untested ones likely to work. It makes them untested compounds…
How to research a compound with no human data without deceiving yourself Replied, post #57 · Compounds › Other compounds · 2 Aug 2025 · 1 like Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing. The correction was fair and I had…
A ten-fold dose error caught before injection — one year on Replied, post #26 · Devices › Syringes & needles · 1 Aug 2025 · 9 likes Fixed versus detachable needles: insulin syringes usually have fixed needles (no dead volume loss to the hub). Luer-lock syringes use detachable needles (more dead…
Temperature loggers worth the money Replied, post #13 · Devices › Cold chain · 28 Jul 2025 · 20 likes post #12 is right about the mechanism and I think understates the practical bit. Freeze-thaw: some peptides tolerate freezing; others do not. Check your compound's…
When a preprint is the best available evidence and we say so Replied, post #3 · Evidence › Preprints · 27 Jul 2025 · 15 likes This follows post #2 rather than contradicting it. Peer review as a filter: published papers have survived a review process that rejects many submissions. Preprints…
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 On post #65 — agreed on the reasoning, with one qualification. On alcohol: the labelling does not contraindicate it, but it raises gastric irritation risk and…
Triple agonism: additive, synergistic, or neither? Replied, post #65 · Compounds › Retatrutide · 7 Jul 2025 · 0 likes Dose escalation in the published trials: the protocols started at lower doses and escalated by defined steps. The step sizes are documented and they may or may not…
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 Amylin signalling is distinct from GLP-1 signalling. Amylin slows gastric emptying and promotes satiety through a different receptor and different neural pathways. The…
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 When "no data" is the complete and final answer: if there is no published human data on a compound, that is the state of knowledge. Hope is not a substitute and…
Half-life, steady state, and accumulation worked through Replied, post #49 · Pharmacology › Pharmacokinetics · 1 Jun 2025 · 0 likes Coming back to post #47, because the follow-up matters more than the original answer. Fasting requirement for oral semaglutide: food and large fluid volumes reduce…
A well-designed study with a badly written abstract Replied, post #6 · Evidence › Study critique · 2 Apr 2025 · 0 likes Confounding: in observational data, is there a third variable that explains the apparent association? In randomised data, randomisation should balance unknown…
Charge states for a 4 kDa peptide, worked through Replied, post #96 · Analytics › Mass spectrometry · 13 Mar 2025 · 4 likes post #95 is right about the mechanism and I think understates the practical bit. Calibration matters: a high-resolution instrument out of calibration can report mass…
Criticising the method without criticising the authors Replied, post #40 · Evidence › Study critique · 16 Feb 2025 · 2 likes Generalisability: do the inclusion/exclusion criteria narrow the population so much that results do not apply to real people asking about it? This is a fair criticism…
Canadian access and provincial variation Replied, post #61 · Regional › North America · 6 Feb 2025 · 3 likes Indigenous healthcare systems: different indigenous healthcare systems have different medication access. Pathways through tribal health systems differ from mainstream…
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 Sleep and mental health: these compounds can affect sleep for some people. Sleep deprivation worsens mood and anxiety. Addressing sleep separately from mood matters.
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 Primary documents matter: regulatory positions are published in official documents. Reading the regulatory agency's website directly is more reliable than reading a…
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 For anyone arriving from search engines: this subcategory discusses published preclinical work and the absence of published clinical work. It does not endorse or…
US compounding rules and how they changed Replied, post #31 · Regional › North America · 19 Oct 2024 · 0 likes Provincial formularies in Canada are published and are the correct source for coverage information. Coverage for weight management is less common than for diabetes.
Hypertension improvement and when medication needs revisiting — a second dataset Replied, post #31 · Clinical › Comorbidities · 14 Oct 2024 · 4 likes Type 2 diabetes: the population with the largest evidence base for these compounds. The SURPASS and SUSTAIN programmes established glycaemic benefit. The renal and…
High-resolution MS on aggregates and what it can see — one year on Replied, post #59 · Analytics › Mass spectrometry · 22 Aug 2024 · 23 likes Mass accuracy is expressed in parts per million. It is the difference between observed and theoretical mass divided by theoretical mass, multiplied by a million. A…
How this community labels and discusses unrefereed work Replied, post #53 · Evidence › Preprints · 1 Jul 2024 · 0 likes On post #49 — agreed on the reasoning, with one qualification. How to cite a preprint: author last name, first initial, et al. Title. Server name [preprint]. Posted…