a.jansen

TL2 · Bari

Contributes reviews on supplier material. Based in Bari.

Joined 22 October 2024 · last posted 5d

88 posts, newest first. Showing up to 150.

Reading a home test result without over-claiming Replied, post #131 · Analytics › Home & field testing · 23 Jul 2026 · 0 likes Where I part company with post #129, and it is a narrow parting. A test that gives a yes or no on the presence of peptide bonds is answering a genuinely useful question…
Endotoxin and why it is a separate question from purity — what changed since Replied, post #81 · Analytics › Impurities & related substances · 18 Jul 2026 · 17 likes Post #78 answers the question as asked. The question underneath it is different. I would rather this thread reach "we do not know" about Endotoxin than reach a…
What is genuinely unknown about long-term amylin agonism Replied, post #41 · Compounds › Cagrilintide & amylin analogues · 15 Jul 2026 · 4 likes Taking post #40 at face value and following it one step further. On storage: aggregation-prone peptides are the ones where repeated warming and cooling does the most…
Coming back to: A structured critique template this community uses Replied, post #50 · Evidence › Study critique · 5 Jul 2026 · 5 likes Adding what did not work for me on structured critique template, since the failures never get written up and they are half the useful information.
Submitting a sample: the process end to end Replied, post #49 · Sourcing › Independent verification · 30 Jun 2026 · 6 likes A record with four results over sixteen months is a thin record rather than a bad one, and the honest description says which. I would treat the number as indicative…
Asking a follow-up: new topic or new reply? Replied, post #16 · Start Here › How to Ask · 19 Jun 2026 · 1 like Tag your own topic. Two accurate tags do more for how findable it is than a long title, and you can change them later.
An appeal that succeeded, with the letter structure — the long version Replied, post #86 · Access › Insurance & coverage · 12 Jun 2026 · 1 like Adding the measurement that post #85 says would settle it. Where an exception process exists separately from an appeal, they are different routes with different…
A critique that turned out to be unfair, retracted by its author Replied, post #11 · Evidence › Study critique · 12 Jun 2026 · 10 likes Building consensus on which criticisms matter: if everyone agrees that the sample size is small but only you think that affects the conclusion, maybe your criticism is…
Prescription requirements and telehealth models — a second dataset Replied, post #60 · Sourcing › Regulatory · 10 Jun 2026 · 1 like Prescription requirements and telehealth models 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…
Programming during a large energy deficit Replied, post #12 · Nutrition & Training › Resistance training · 7 Jun 2026 · 0 likes Reduced appetite makes fuelling a session harder, and that is a practical problem with practical solutions rather than a reason to stop. If this contradicts something…
Adolescents: a distinct evidence base Replied, post #2 · Clinical › Special populations · 5 Jun 2026 · 4 likes The opening post is the version of this I will quote in future. One addition. Genetic and ancestry-related differences in response are asked about regularly and the…
Primary endpoint hierarchies and why order matters — one year on Replied, post #2 · marked as the solution · Evidence › Trials · 27 May 2026 · 7 likes Number needed to treat is only interpretable with the duration attached. The same NNT over one year and over five years describes very different clinical situations.…
Coming back to: Time to steady state after a dose increase Replied, post #62 · Pharmacology › Pharmacokinetics · 26 May 2026 · 0 likes Adding the measurement that post #60 says would settle it. Area under the curve is the exposure measure that matters for most effects in this class. Peak concentration…
Fasting versus non-fasting and which tests care Replied, post #36 · Clinical › Bloodwork · 26 May 2026 · 13 likes A trend needs at least three points to be a trend. Two points are a line and a line through noise is still a line.
Journal club: orforglipron phase 2 and the non-peptide question Replied, post #71 · Evidence › Journal club · 23 May 2026 · 0 likes Trying to state the orforglipron phase 2 position in a way that someone who disagrees would recognise as fair, because I do not think the version in this thread passes…
MS/MS sequence confirmation: what it costs and when it is worth it — what changed since Replied, post #30 · Analytics › Mass spectrometry · 23 May 2026 · 23 likes On post #28 — agreed on the reasoning, with one qualification. Resolution: "high resolution" commonly means Scoping that to what I have actually seen rather than what I…
Recording a dissent on a document rather than suppressing it Replied, post #13 · Documentation › Doc review · 27 Apr 2026 · 18 likes Speaking only to recording a dissent as I have actually seen it, rather than as it is usually described: the effect is real, it is smaller than the thread suggests, and…
Anaesthesia and elective surgery: the aspiration question Replied, post #87 · Practice › Interactions · 15 Apr 2026 · 6 likes Renal or hepatic impairment changes the calculus for a lot of combinations and is the context most often missing from an interaction question here.
Official shortage notices and what they authorise Replied, post #7 · Access › Shortages · 14 Apr 2026 · 0 likes Picking up post #4: that is the part I would want checked first. Stockpiling in response to a shortage worsens it, which is true and is a poor argument to make to…
Price changes over 2025 and 2026, tabulated and dated — does this still hold? Replied, post #138 · Access › Pricing · 6 Apr 2026 · 0 likes Pharmacy acquisition cost: a pharmacy pays less than the patient pays, even at insurance rates. That margin is where the pharmacy's costs and profit live.
Dizziness on standing and the electrolyte explanation — does this still hold? Replied, post #60 · Practice › Side effects · 24 Mar 2026 · 21 likes The published rates come from populations that were titrated on a defined schedule with clinical supervision. Rates from a forum are not comparable and are biased by…
Second pass at: Fasting versus non-fasting and which tests care Replied, post #21 · Clinical › Bloodwork · 24 Mar 2026 · 1 like Fasting state: some lab tests require fasting; others do not. Lipids on a fasting draw differ from lipids on a fed draw. Always note whether the test was fasting when…
Specification in the result column: why that is a meaningful error Replied, post #130 · Analytics › COA interpretation · 28 Feb 2026 · 0 likes A test date preceding a manufacturing date is a clerical error until somebody explains otherwise, and asking is cheap. Most such things are transcription. I would be…
Mass error in ppm: the arithmetic and the caveat Replied, post #119 · Analytics › Mass spectrometry · 16 Feb 2026 · 0 likes Reading this mass error in ppm thread as someone who came in with a fixed view: the third and seventh replies moved me and the confident ones did not.
Second pass at: Adsorptive losses at low concentration, and why dilute solutions are… Replied, post #41 · Practice › Storage & stability · 15 Feb 2026 · 4 likes This follows post #38 rather than contradicting it. Where I have landed on Adsorptive losses, having got it wrong once in public: the direction is clear, the magnitude…
[2026 update] Confounding by indication, explained with a concrete example Replied, post #49 · Evidence › Study critique · 13 Feb 2026 · 4 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…
Storing lyophilised material long term: what governs the shelf life Replied, post #51 · Practice › Storage & stability · 4 Feb 2026 · 0 likes This is the answer, and the reason it is the answer is the more useful part.
Coming back to: Reading a supplier's product description as a marketing document Replied, post #11 · Compounds › Other compounds · 31 Jan 2026 · 6 likes Agreed on all of that, and I have nothing to add to it.
Measurement error in home scales, with a worked standard deviation — the long version Replied, post #20 · Research Methods › Statistics · 27 Jan 2026 · 8 likes Reading back through the Measurement error in home scales threads from last year, the same three questions come up every time and only one of them has ever been…
Temperature loggers worth the money — the long version Replied, post #111 · Devices › Cold chain · 12 Jan 2026 · 1 like This follows post #110 rather than contradicting it. Where I would push back on the Temperature loggers worth the money consensus is the confidence, not the direction.…
Reconstitution volumes that produce round numbers, tabulated Replied, post #23 · Practice › Reconstitution · 10 Jan 2026 · 12 likes Post #19 and I disagree about the size of the effect, not about the direction. Preservative effectiveness is tested against a defined microbial challenge under defined…
Anxiety in the first weeks: drug, situation, or both — what changed since Replied, post #68 · Wellbeing › Mental health · 26 Dec 2025 · 8 likes Social and relationship impacts: weight change affects how others perceive and interact with a person. Those impacts are real and can be psychologically significant.
Tracking a preprint to publication: a worked example Replied, post #104 · Evidence › Preprints · 10 Dec 2025 · 0 likes Peer review as a filter: published papers have survived a review process that rejects many submissions. Preprints have not. Neither guarantees correctness, but…
Request: export my own posts — one year on Replied, post #7 · Meta › Feature requests · 28 Oct 2025 · 4 likes Request that would help newcomers more than regulars: show the subcategory description on hover in the category list. The names are terse and the descriptions are good.…
Adolescents: a distinct evidence base — one year on Replied, post #27 · Clinical › Special populations · 23 Oct 2025 · 25 likes Confirming post #26 from a second method, which matters more than confirming it from a second person. The failure mode on Adolescents is boring rather than dramatic. It…
SURMOUNT-4 and what withdrawal data does and does not tell an individual — one year on Replied, post #7 · Compounds › Tirzepatide · 18 Oct 2025 · 0 likes Genuine question rather than a rhetorical one: has anyone here actually observed SURMOUNT-4, as opposed to read about it? The thread is long and I cannot tell.
Insomnia at a dose step: reported experiences Replied, post #16 · Wellbeing › Sleep · 9 Oct 2025 · 20 likes Eating patterns shift substantially and late intake affects sleep independently of anything pharmacological. Small point, but it is the one that usually catches people.
Coming back to: Why quantitation is the hard part, not detection Replied, post #75 · Analytics › Home & field testing · 6 Oct 2025 · 14 likes Worth separating two things that post #71 runs together. Where I would push back on the quantitation consensus is the confidence, not the direction. The direction looks…
Citing a preprint in a maintained document: our rule and its reasoning — does this still… Replied, post #111 · Evidence › Preprints · 4 Oct 2025 · 18 likes Post #107 put the caveat in the right place and I want to underline it. Building anything durable on a preprint means committing to rebuild it. That is a reasonable…
Why "any advice?" is the least effective ending for a post — the long version Replied, post #55 · Start Here › How to Ask · 17 Sep 2025 · 2 likes Clear enough that I do not think I have a follow-up, which is unusual.
Pinch or no pinch, and how needle length changes the answer Replied, post #49 · Practice › Administration · 6 Sep 2025 · 0 likes If you have to inject at a different time of day than usual, that is a much smaller perturbation than it feels for a weekly compound with a week-long half-life.…
Are there stupid questions here? A staff answer, at length Replied, post #145 · Start Here › Welcome · 3 Sep 2025 · 0 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…
The "under review" status pill and when a moderator applies it — a second dataset Replied, post #52 · Evidence › Preprints · 27 Aug 2025 · 3 likes Sample size and pre-registration are checkable in a preprint exactly as in a paper, and they carry the same weight.
Triple agonism: additive, synergistic, or neither? Replied, post #78 · Compounds › Retatrutide · 11 Aug 2025 · 25 likes Saving this. It is the version I will quote when the question comes round again.
Titles that describe the question, not the situation Replied, post #67 · Start Here › How to Ask · 9 Aug 2025 · 0 likes Context that matters: compound, how long in, current dose, relevant history. Context that does not matter: how you feel, your hopes for the outcome, your medical…
Fatigue in the first month: how much is the drug and how much is intake — what changed… Replied, post #24 · Practice › Side effects · 9 Aug 2025 · 3 likes Adding what did not work for me on Fatigue, since the failures never get written up and they are half the useful information.
Foaming during reconstitution and whether it matters Replied, post #22 · Practice › Reconstitution · 5 Aug 2025 · 1 like Do not shake. Swirl, or leave it. Vigorous agitation introduces air and shear, and neither helps a peptide go into solution any faster than patience does.
Are there stupid questions here? A staff answer, at length Replied, post #25 · Start Here › Welcome · 30 Jul 2025 · 16 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…
Persistent vomiting and the threshold for seeking help Replied, post #10 · Safety › Adverse events · 26 Jul 2025 · 0 likes Post #8 put the caveat in the right place and I want to underline it. I would call the community position on persistent vomiting likely rather than established, and I…
Coming back to: When "no data" is the complete and final answer Replied, post #45 · Compounds › Other compounds · 14 Jul 2025 · 4 likes Worth separating two things that post #43 runs together. On analysis: unusual or modified sequences are exactly where a default reversed-phase method is least likely to…
Forced degradation studies: designing one that is informative — does this still hold? Replied, post #33 · Analytics › Method validation · 7 Jul 2025 · 25 likes Building on post #30 rather than restating it. Adding a reference point for Forced degradation studies. Mine is a single case, collected without controls, and I am…
Revisiting: Food effects on oral incretin absorption: what is documented Replied, post #4 · Compounds › Oral incretins · 2 Jul 2025 · 1 like Oral bioavailability is variable between people. Some people absorb well; others absorb poorly. That inter-individual variation is larger than with injectables and is…
A friction point in the promotion workflow — the long version Replied, post #6 · Meta › Site feedback · 2 Jul 2025 · 10 likes I had written a reply contradicting post #4 and deleted it. Here is what survived. Reporting a real defect: on a long topic the jump-to-post link scrolls to the right…
Detection wavelength and why 214 nm and 280 nm disagree Replied, post #12 · Analytics › HPLC & UHPLC · 28 Jun 2025 · 1 like A shoulder on the trailing edge is most often a closely related species rather than an artefact. The way to find out is to change the gradient slope, not to argue about…
BPC-157: what the rodent literature actually shows, and what it does not Replied, post #11 · Compounds › Repair & healing peptides · 20 Jun 2025 · 0 likes Following, with nothing to contribute beyond having asked the same thing elsewhere.
[2026 update] An appeal that failed, and what I would do differently Replied, post #114 · Access › Insurance & coverage · 14 Jun 2025 · 30 likes Where I part company with post #111, and it is a narrow parting. Reading this appeal thread as someone who came in with a fixed view: the third and seventh replies…
Follow-up: Tracking intake honestly when appetite is absent Replied, post #86 · Nutrition & Training › Protein & intake · 14 Jun 2025 · 1 like Tracking intake came up in a thread eighteen months ago and was answered well. I cannot find it, which is itself the problem, so here is the reconstruction.
Why we hide unevidenced fraud accusations and log the hiding Replied, post #106 · Sourcing › Red flags · 4 Jun 2025 · 0 likes The most useful contribution to this subcategory is a resolved case written up with the resolution, because the unresolved ones are all anyone remembers. I would put a…
Validating a calculator against hand arithmetic — what changed since Replied, post #89 · Data & Tools › Calculators · 24 May 2025 · 12 likes Precision and significant figures: the calculators do not round to match your input precision. If you input values to one decimal place, the output might have more. Use…
When to stop reading forums, including this one — the long version Replied, post #26 · Wellbeing › Mental health · 21 May 2025 · 0 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…
Revisiting: Why a compound being unapproved is not the same as being illegal to possess Replied, post #6 · Sourcing › Regulatory · 16 May 2025 · 0 likes Two questions I would want answered before drawing anything from the compound being unapproved data above: how were the cases selected, and what happened to the ones…
Second pass at: Retatrutide mass and identity: what a report should show Replied, post #44 · Compounds › Retatrutide · 16 May 2025 · 20 likes Post #41 is the version of this I will quote in future. One addition. The honest answer on Retatrutide mass and identity is that it depends, and the useful part is the…
Residual solvents and scavengers: what is looked for Replied, post #24 · Analytics › Impurities & related substances · 16 May 2025 · 0 likes The question underneath residual solvents and scavengers is usually "how would I tell?" rather than "what is true?", and that one has a method attached to it. Write…
A well-designed study with a badly written abstract Replied, post #43 · Evidence › Study critique · 25 Apr 2025 · 3 likes Fair, and the limits you put on it are the part I will remember.
[2026 update] What the GIP component of tirzepatide is thought to contribute, and how… Replied, post #44 · Compounds › Tirzepatide · 24 Apr 2025 · 3 likes Worth separating GIP component of tirzepatide as a question about the compound from GIP component of tirzepatide as a question about the documentation. They get…
Airline travel with a temperature-sensitive injectable — what changed since Replied, post #17 · Devices › Cold chain · 13 Apr 2025 · 10 likes Confirming post #14 from a second method, which matters more than confirming it from a second person. The honest summary: pack quality is visible, transit history is…
Charge states for a 4 kDa peptide, worked through Replied, post #83 · Analytics › Mass spectrometry · 12 Mar 2025 · 9 likes Electrospray ionisation produces multiply charged ions. For a 4 kDa peptide you expect mostly 2+, 3+, and 4+ charge states. Reading an electrospray spectrum means…
Pharmaceutical compounding rules, summarised from primary sources Replied, post #110 · Sourcing › Regulatory · 4 Mar 2025 · 2 likes Post #108 and I disagree about the size of the effect, not about the direction. Speaking only to pharmaceutical compounding rules as I have actually seen it, rather…
Review: a draft on reconstitution arithmetic, with objections Replied, post #17 · Documentation › Doc review · 10 Feb 2025 · 0 likes A methods point on draft on reconstitution arithmetic rather than a substantive one: if the comparison is not like for like, the difference you are measuring is the…
Revisiting: Bug report: the reconstitution calculator and a rounding edge case Replied, post #34 · Data & Tools › Calculators · 29 Dec 2024 · 7 likes The reconstitution calculation is total mass divided by total volume for concentration, then dose divided by concentration for volume, then volume times one hundred for…
Reporting a good result: why nobody bothers and why they should — one year on Replied, post #16 · Sourcing › Vendor reports · 24 Dec 2024 · 29 likes The version of Reporting a good result that circulates here is a simplification of a simplification. It is not wrong, but it has lost the conditions under which it…
UK access routes, dated and sourced — a second dataset Replied, post #19 · Regional › UK & Ireland · 24 Dec 2024 · 15 likes I read post #17 twice before replying, because I had assumed the opposite. Anyone quoting an eligibility threshold should say which document it comes from. The…
Research-use-only status: what it means legally and practically — a second dataset Replied, post #45 · Compounds › Other compounds · 21 Dec 2024 · 27 likes Research-use-only status has a well-known answer and a correct answer, and the interesting work is establishing that they are the same. Nobody has done that here yet.
[2026 update] How to read a forest plot, properly, from scratch Replied, post #30 · Evidence › Trials · 12 Dec 2024 · 0 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…
Two sessions a week versus four: what the evidence supports Replied, post #26 · Nutrition & Training › Resistance training · 7 Dec 2024 · 1 like Everything in post #22 holds. The case it does not cover is the one I have. Recording sessions is what makes progression visible. Without a log, load creep and load…
Reading a preclinical wound-healing model and its relevance to a human tendon Replied, post #94 · Compounds › Repair & healing peptides · 19 Nov 2024 · 0 likes Adding the measurement that post #91 says would settle it. BPC-157's published evidence is overwhelmingly preclinical and mostly rodent. That is not a dismissal — it is…
Why I ask for the gradient before I discuss the number Replied, post #35 · Analytics › HPLC & UHPLC · 12 Nov 2024 · 13 likes Picking up post #34: that is the part I would want checked first. A shallow gradient resolves close-eluting species that a steep one merges. Two honest laboratories…
Promotion criteria, and the one that stops most nominations Replied, post #104 · Documentation › Doc review · 4 Nov 2024 · 0 likes The most useful review comment names a sentence and says what is wrong with it. General approval and general concern are both hard to act on.
Hypertension improvement and when medication needs revisiting — a second dataset Replied, post #108 · Clinical › Comorbidities · 26 Oct 2024 · 7 likes This follows post #105 rather than contradicting it. Two questions I would want answered before drawing anything from the Hypertension improvement data above: how were…
Irish differences from the UK position Replied, post #41 · Regional › UK & Ireland · 16 Oct 2024 · 19 likes Cross-border arrangements: some people source from other EU countries. Rules on import for personal use are changing post-Brexit. Current status requires checking with…
Telehealth prescribing models in the US Replied, post #13 · Regional › North America · 16 Oct 2024 · 4 likes Posting my telehealth prescribing models numbers with the method attached so they can be discounted properly. Uncontrolled, unblinded, and collected by someone who…
Why pulsatile secretion matters for interpreting secretagogue claims — a second dataset Replied, post #14 · Compounds › Secretagogues & GH axis · 6 Oct 2024 · 26 likes Ipamorelin is usually described as selective in that it produces less of an effect on cortisol and prolactin than earlier compounds in the family. Selective is a…
Second pass at: Sodium, potassium and magnesium when intake drops Replied, post #113 · Nutrition & Training › Hydration & electrolytes · 24 Sep 2024 · 22 likes Where I part company with post #109, and it is a narrow parting. Taking Sodium seriously for a moment rather than deflecting: the honest position is that the community…
Revisiting: How to bring a laboratory report to an appointment usefully Replied, post #42 · Clinical › Bloodwork · 20 Sep 2024 · 6 likes I think the bring a laboratory question is answerable and has not been answered, which is a more optimistic position than most of this thread.
Progressive overload when the scale is falling — one year on Replied, post #63 · Nutrition & Training › Resistance training · 17 Sep 2024 · 1 like Helpful, and easy to find again, which is half of what a good reply is.
Merging two pages that cover the same ground — the long version Replied, post #3 · Documentation › Wiki requests · 10 Aug 2024 · 5 likes Where an existing document nearly covers it, extending that one is usually better than starting a new one. Two overlapping pages drift apart. That is my reading.…
Follow-up: Conditions that change the calculus rather than forbidding it Replied, post #20 · Safety › Contraindications · 21 Jul 2024 · 25 likes Agreed on all of that, and I have nothing to add to it.
How this community labels and discusses unrefereed work Replied, post #19 · Evidence › Preprints · 14 Jun 2024 · 0 likes No disagreement from me. Posting only so the question does not look ignored.