a.jansen

TL2 Moderator · Bari

Contributes reviews on supplier material. Based in Bari.

Joined 22 October 2024 · last posted 5d

89 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 I read post #129 twice before replying, because I had assumed the opposite. Colorimetric tests: colour intensity correlates with concentration, but the relationship is…
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 This follows post #78 rather than contradicting it. Disulfide formation: if a peptide contains cysteine, it can form disulfide bonds with itself or with other…
What is genuinely unknown about long-term amylin agonism Replied, post #41 · Compounds › Cagrilintide & amylin analogues · 15 Jul 2026 · 4 likes post #40 answers the question as asked. The question underneath it is different. For anyone arriving from a search: the marked solution above is the direct answer, and…
Coming back to: A structured critique template this community uses Replied, post #50 · Evidence › Study critique · 5 Jul 2026 · 5 likes Publication bias: a single published positive trial is weaker evidence than multiple published trials with consistent results. Asking whether there are unpublished…
Submitting a sample: the process end to end Replied, post #49 · Sourcing › Independent verification · 30 Jun 2026 · 6 likes VendorInvestigate: documentation and supplier-practice review. Reviews paperwork rather than vials. Tells you something about a supplier's systems but says nothing…
Asking a follow-up: new topic or new reply? Replied, post #16 · Start Here › How to Ask · 19 Jun 2026 · 1 like Chromatogram questions: describe the method first. Column type, gradient, wavelength, detection method. Everything else follows from method. A chromatogram without…
An appeal that succeeded, with the letter structure — the long version Replied, post #86 · Access › Insurance & coverage · 12 Jun 2026 · 1 like post #85 is right about the mechanism and I think understates the practical bit. Reimbursement changes: a compound covered one year might not be the next. A formulary…
A critique that turned out to be unfair, retracted by its author Replied, post #11 · Evidence › Study critique · 12 Jun 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…
Prescription requirements and telehealth models — a second dataset Replied, post #60 · Sourcing › Regulatory · 10 Jun 2026 · 1 like Approval versus licensing: a compound can be approved for a specific indication in one country and not approved at all in another. Tracking jurisdictional approval is…
Programming during a large energy deficit Replied, post #12 · Nutrition & Training › Resistance training · 7 Jun 2026 · 0 likes Programming while losing weight quickly: realistic expectations are crucial. Strength often stays surprisingly stable; power output might decline slightly. Expecting…
Adolescents: a distinct evidence base Replied, post #2 · Clinical › Special populations · 5 Jun 2026 · 4 likes the opening post is right about the mechanism and I think understates the practical bit. Thank you for the correction. I have edited my earlier post with a note rather…
Primary endpoint hierarchies and why order matters — one year on Replied, post #2 · marked as the solution · Evidence › Trials · 27 May 2026 · 7 likes Risk of bias: structured appraisal of internal validity. Key things to assess: randomisation method (was it truly random or could someone predict the next assignment),…
Coming back to: Time to steady state after a dose increase Replied, post #62 · Pharmacology › Pharmacokinetics · 26 May 2026 · 0 likes post #61 answers the question as asked. The question underneath it is different. Hepatic metabolism: the degree to which each compound is hepatically metabolised versus…
Fasting versus non-fasting and which tests care Replied, post #36 · Clinical › Bloodwork · 26 May 2026 · 13 likes Liver enzymes: elevation does not specify cause. ALT and AST can rise from many things. Bilirubin helps narrow down the cause. Multiple markers together are more…
Journal club: orforglipron phase 2 and the non-peptide question Replied, post #71 · Evidence › Journal club · 23 May 2026 · 0 likes Critical appraisal template: (1) What did the trial set out to estimate? (2) Could the design answer that question? (3) Was the population sufficiently similar to your…
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 Coming back to post #28, because the follow-up matters more than the original answer. Common adducts: sodium adds ≈22, potassium adds ≈38 compared to hydrogen. A…
Recording a dissent on a document rather than suppressing it Replied, post #13 · Documentation › Doc review · 27 Apr 2026 · 18 likes Interdependencies: if updating one page requires updating related pages, posting that connection here helps the maintainers see the scope of work.
Anaesthesia and elective surgery: the aspiration question Replied, post #87 · Practice › Interactions · 15 Apr 2026 · 6 likes Anticoagulants: no direct interaction with the compounds in this class. Weight loss and body composition changes might affect the clearance or effect of warfarin if you…
Official shortage notices and what they authorise Replied, post #7 · Access › Shortages · 14 Apr 2026 · 0 likes This follows post #4 rather than contradicting it. Compounding during shortages: some jurisdictions allow pharmacy compounding when a marketed product is in shortage.…
Price changes over 2025 and 2026, tabulated and dated — does this still hold? Replied, post #138 · Access › Pricing · 6 Apr 2026 · 0 likes Insurance tier placement: a compound might be covered but on a higher tier (higher copay). Moving to a lower tier usually requires prior authorization or documented…
Dizziness on standing and the electrolyte explanation — does this still hold? Replied, post #60 · Practice › Side effects · 24 Mar 2026 · 21 likes Nausea: the most common side effect and the most dose- and titration-dependent one. It is usually most prominent in the first 24 to 48 hours after injection and…
Second pass at: Fasting versus non-fasting and which tests care Replied, post #21 · Clinical › Bloodwork · 24 Mar 2026 · 1 like A single value outside interval: usually uninformative on a single draw. What makes a result interesting: a trend across multiple draws, a magnitude well beyond the…
Specification in the result column: why that is a meaningful error Replied, post #130 · Analytics › COA interpretation · 28 Feb 2026 · 0 likes When a document puts the specification in the result column, it has told you the release criterion, not the measurement. Those are different claims and the second is…
Mass error in ppm: the arithmetic and the caveat Replied, post #119 · Analytics › Mass spectrometry · 16 Feb 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…
Second pass at: Adsorptive losses at low concentration, and why dilute solutions are… Replied, post #41 · Practice › Storage & stability · 15 Feb 2026 · 4 likes Picking up post #38: that is the part I would want checked first. Temperature excursions: if a vial sat at room temperature for a time, the question is whether the…
[2026 update] Confounding by indication, explained with a concrete example Replied, post #49 · Evidence › Study critique · 13 Feb 2026 · 4 likes What makes a methodological criticism substantive: it identifies a specific feature of the design that materially affects what the paper can conclude. "Small sample…
Storing lyophilised material long term: what governs the shelf life Replied, post #51 · Practice › Storage & stability · 4 Feb 2026 · 0 likes Worth separating two things that post #47 runs together. Visual inspection: if a solution is visibly cloudy, discoloured, or contains particles, those are red flags.…
Coming back to: Reading a supplier's product description as a marketing document Replied, post #11 · Compounds › Other compounds · 31 Jan 2026 · 6 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…
Measurement error in home scales, with a worked standard deviation — the long version Replied, post #20 · Research Methods › Statistics · 27 Jan 2026 · 8 likes P-values and significance: p
Temperature loggers worth the money — the long version Replied, post #111 · Devices › Cold chain · 12 Jan 2026 · 1 like post #110 answers the question as asked. The question underneath it is different. Shipping container and cold packs: reputable suppliers use insulated containers with…
Reconstitution volumes that produce round numbers, tabulated Replied, post #23 · Practice › Reconstitution · 10 Jan 2026 · 12 likes On post #19 — agreed on the reasoning, with one qualification. Reconstituting a multi-strength kit: if a kit contains 5 mg, 10 mg, 15 mg vials and you are…
Second pass at: The topic list is dense — is that deliberate? Replied, post #40 · Meta › Site feedback · 10 Jan 2026 · 0 likes Display issues: broken layouts, images not loading, text overlapping — report with the browser and device you were using. Display bugs are platform-specific.
Anxiety in the first weeks: drug, situation, or both — what changed since Replied, post #68 · Wellbeing › Mental health · 26 Dec 2025 · 8 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.
Tracking a preprint to publication: a worked example Replied, post #104 · Evidence › Preprints · 10 Dec 2025 · 0 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…
Request: export my own posts — one year on Replied, post #7 · Meta › Feature requests · 28 Oct 2025 · 4 likes Requests for platform and documentation features, with the reasoning that justifies them. If you think the site would be better with a feature, suggest it with enough…
Adolescents: a distinct evidence base — one year on Replied, post #27 · Clinical › Special populations · 23 Oct 2025 · 25 likes post #26 answers the question as asked. The question underneath it is different. Renal impairment: the compounds are cleared renally to some degree. Dose adjustments…
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 Titration schedules for tirzepatide have more dose steps than semaglutide partly because the compound is more potent and partly because the clinical programme used a…
Insomnia at a dose step: reported experiences Replied, post #16 · Wellbeing › Sleep · 9 Oct 2025 · 20 likes Gastrointestinal effects overnight: nausea or reflux or constipation at night can disrupt sleep. Dosing timing (morning versus evening) might help if nighttime GI…
Coming back to: Why quantitation is the hard part, not detection Replied, post #75 · Analytics › Home & field testing · 6 Oct 2025 · 14 likes On post #71 — agreed on the reasoning, with one qualification. Colorimetric tests: colour intensity correlates with concentration, but the relationship is non-linear at…
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 On post #107 — agreed on the reasoning, with one qualification. How to cite a preprint: author last name, first initial, et al. Title. Server name [preprint]. Posted…
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 Worth separating two things that post #51 runs together. Asking a follow-up: new topic or reply in the old one? If the answer depends on the previous post, reply. If it…
Pinch or no pinch, and how needle length changes the answer Replied, post #49 · Practice › Administration · 6 Sep 2025 · 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…
Are there stupid questions here? A staff answer, at length Replied, post #145 · Start Here › Welcome · 3 Sep 2025 · 0 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…
The "under review" status pill and when a moderator applies it — a second dataset Replied, post #52 · Evidence › Preprints · 27 Aug 2025 · 3 likes How to cite a preprint: author last name, first initial, et al. Title. Server name [preprint]. Posted date. Doi. Include the server name and note that it is a preprint.
Triple agonism: additive, synergistic, or neither? Replied, post #78 · Compounds › Retatrutide · 11 Aug 2025 · 25 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…
Titles that describe the question, not the situation Replied, post #67 · Start Here › How to Ask · 9 Aug 2025 · 0 likes The specific question in the title is more useful than you might think. A title like "a question I have" forces the person answering to guess what you want to know. A…
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 Timeline matters: onset, duration, pattern over days or weeks, relationship to injection and to meals all provide information that "I have nausea" does not. Posting…
Foaming during reconstitution and whether it matters Replied, post #22 · Practice › Reconstitution · 5 Aug 2025 · 1 like 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…
Are there stupid questions here? A staff answer, at length Replied, post #25 · Start Here › Welcome · 30 Jul 2025 · 16 likes The compound and evidence pages are updated regularly and they are worth reading when you are new. They answer the meta questions like "do we have data on this" and…
Persistent vomiting and the threshold for seeking help Replied, post #10 · Safety › Adverse events · 26 Jul 2025 · 0 likes I read post #8 twice before replying, because I had assumed the opposite. How to document: date, exact symptom or event, severity, duration, outcome, any medical…
Coming back to: When "no data" is the complete and final answer Replied, post #45 · Compounds › Other compounds · 14 Jul 2025 · 4 likes Coming back to post #43, because the follow-up matters more than the original answer. Why catalogue breadth is not evidence of anything: a supplier listing 500…
Forced degradation studies: designing one that is informative — does this still hold? Replied, post #33 · Analytics › Method validation · 7 Jul 2025 · 25 likes Picking up post #30: that is the part I would want checked first. Forced degradation studies: deliberately stress the material with acid, base, oxidant, heat, light to…
Revisiting: Food effects on oral incretin absorption: what is documented Replied, post #4 · Compounds › Oral incretins · 2 Jul 2025 · 1 like For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.
A friction point in the promotion workflow — the long version Replied, post #6 · Meta › Site feedback · 2 Jul 2025 · 10 likes Coming back to post #4, because the follow-up matters more than the original answer. Display issues: broken layouts, images not loading, text overlapping — report with…
Detection wavelength and why 214 nm and 280 nm disagree Replied, post #12 · Analytics › HPLC & UHPLC · 28 Jun 2025 · 1 like Column chemistry and particle size: smaller particles (1.7 μm) give better resolution and higher efficiency than larger particles (3.5 μm or 5 μm), at the cost of…
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 For anyone arriving from search engines: this subcategory discusses published preclinical work and the absence of published clinical work. It does not endorse or…
[2026 update] An appeal that failed, and what I would do differently Replied, post #114 · Access › Insurance & coverage · 14 Jun 2025 · 30 likes On post #110 — agreed on the reasoning, with one qualification. Generic versus brand: most of these compounds do not have generic versions yet. Once they do, formulary…
Follow-up: Tracking intake honestly when appetite is absent Replied, post #86 · Nutrition & Training › Protein & intake · 14 Jun 2025 · 1 like 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…
Why we hide unevidenced fraud accusations and log the hiding Replied, post #106 · Sourcing › Red flags · 4 Jun 2025 · 0 likes Documentation quality as a signal: a supplier that reports method identifiers, distinguishes specification from result, and states the counter-ion form is telling you…
Validating a calculator against hand arithmetic — what changed since Replied, post #89 · Data & Tools › Calculators · 24 May 2025 · 12 likes Offline use: all calculators are written in JavaScript and can be downloaded and run offline if desired. They do not require internet connectivity to function.
When to stop reading forums, including this one — the long version Replied, post #26 · Wellbeing › Mental health · 21 May 2025 · 0 likes When to involve a professional: if mood changes are persistent, deepen over weeks, or interfere with function, involving a mental health professional is appropriate.…
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 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…
Second pass at: Retatrutide mass and identity: what a report should show Replied, post #44 · Compounds › Retatrutide · 16 May 2025 · 20 likes Picking up post #41: that is the part I would want checked first. Triple agonism: is the effect additive, synergistic, or neither? A phase 2 comparison of tirzepatide…
Residual solvents and scavengers: what is looked for Replied, post #24 · Analytics › Impurities & related substances · 16 May 2025 · 0 likes Incomplete deprotection: mass higher by the protecting group mass. Usually markedly later eluting. A synthesis artifact from incomplete removal of protecting groups.
A well-designed study with a badly written abstract Replied, post #43 · Evidence › Study critique · 25 Apr 2025 · 3 likes Defending a paper against criticism: if the authors respond, they might clarify something the paper explained poorly. Their response might also miss your point. Either…
[2026 update] What the GIP component of tirzepatide is thought to contribute, and how… Replied, post #44 · Compounds › Tirzepatide · 24 Apr 2025 · 3 likes Storage and stability: published data on licensed tirzepatide formulations exists and is worth reading directly rather than through summarised claims. Reconstituted…
Airline travel with a temperature-sensitive injectable — what changed since Replied, post #17 · Devices › Cold chain · 13 Apr 2025 · 10 likes Picking up post #14: that is the part I would want checked first. Light protection: avoid direct sunlight and UV exposure. Amber vials or opaque containers reduce light…
Charge states for a 4 kDa peptide, worked through Replied, post #83 · Analytics › Mass spectrometry · 12 Mar 2025 · 9 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…
Pharmaceutical compounding rules, summarised from primary sources Replied, post #110 · Sourcing › Regulatory · 4 Mar 2025 · 2 likes I read post #108 twice before replying, because I had assumed the opposite. Compounding and pharmacy rules: some jurisdictions allow a pharmacy to compound a drug that…
Review: a draft on reconstitution arithmetic, with objections Replied, post #17 · Documentation › Doc review · 10 Feb 2025 · 0 likes Fact-checking: if you see a factual claim in a maintained page that you have evidence contradicts, post the evidence here. The maintainer will review and correct if you…
Revisiting: Bug report: the reconstitution calculator and a rounding edge case Replied, post #34 · Data & Tools › Calculators · 29 Dec 2024 · 7 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…
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 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…
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. Two things before anyone answers the substance. First, the context in the first post is clear…
Research-use-only status: what it means legally and practically — a second dataset Replied, post #45 · Compounds › Other compounds · 21 Dec 2024 · 27 likes Melanocortin agonists: mechanism involves the melanocortin-4 receptor pathway that regulates appetite. The documented adverse profile includes blood pressure elevation…
[2026 update] How to read a forest plot, properly, from scratch Replied, post #30 · Evidence › Trials · 12 Dec 2024 · 0 likes Two things before anyone answers the substance. First, the context in the first post is clear and specific. Second, the question is framed so that an answer can…
Two sessions a week versus four: what the evidence supports Replied, post #26 · Nutrition & Training › Resistance training · 7 Dec 2024 · 1 like Worth separating two things that post #22 runs together. Deload weeks: periodic weeks (every 4 to 8 weeks) with reduced volume and intensity can help with recovery and…
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 This follows post #91 rather than contradicting it. For anyone arriving from search engines: this subcategory discusses published preclinical work and the absence of…
Why I ask for the gradient before I discuss the number Replied, post #35 · Analytics › HPLC & UHPLC · 12 Nov 2024 · 13 likes post #34 answers the question as asked. The question underneath it is different. Reversed-phase separates on hydrophobicity. A peptide is retained on a non-polar…
Promotion criteria, and the one that stops most nominations Replied, post #104 · Documentation › Doc review · 4 Nov 2024 · 0 likes Revision disputes: if you disagree with an edit a maintainer made to a page, discuss it here. The goal is accuracy and clarity, not authorship.
Hypertension improvement and when medication needs revisiting — a second dataset Replied, post #108 · Clinical › Comorbidities · 26 Oct 2024 · 7 likes Picking up post #105: that is the part I would want checked first. Comorbidity control: if a comorbidity (high blood pressure, high lipids) is not adequately…
Irish differences from the UK position Replied, post #41 · Regional › UK & Ireland · 16 Oct 2024 · 19 likes Importing for personal use: importing a prescription-only medicine without a prescription is not lawful. Material sold as research-use-only is not a licensed medicine…
Telehealth prescribing models in the US Replied, post #13 · Regional › North America · 16 Oct 2024 · 4 likes For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.
Why pulsatile secretion matters for interpreting secretagogue claims — a second dataset Replied, post #14 · Compounds › Secretagogues & GH axis · 6 Oct 2024 · 26 likes Evidence quality in the secretagogue literature is honestly weaker than in the incretin literature. Large randomised controlled trials are rare. Most evidence is…
Second pass at: Sodium, potassium and magnesium when intake drops Replied, post #113 · Nutrition & Training › Hydration & electrolytes · 24 Sep 2024 · 22 likes Worth separating two things that post #109 runs together. Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down what you did…
Revisiting: How to bring a laboratory report to an appointment usefully Replied, post #42 · Clinical › Bloodwork · 20 Sep 2024 · 6 likes Renal function markers: eGFR is estimated, not measured. It depends on creatinine, age, and weight. A small change in creatinine might not mean a real change in kidney…
Progressive overload when the scale is falling — one year on Replied, post #63 · Nutrition & Training › Resistance training · 17 Sep 2024 · 1 like I read post #61 twice before replying, because I had assumed the opposite. Adaptation and plateau: if strength does not change for weeks, that is stability, not…
Merging two pages that cover the same ground — the long version Replied, post #3 · Documentation › Wiki requests · 10 Aug 2024 · 5 likes Correction requests: if you spot an error in a maintained page, note it here with the specific correction. The maintainer will review and update if justified.
Follow-up: Conditions that change the calculus rather than forbidding it Replied, post #20 · Safety › Contraindications · 21 Jul 2024 · 25 likes Pregnancy: these compounds are not approved for pregnancy. The potential risks outweigh potential benefits. Planning windows and washout (several months) are the…
How this community labels and discusses unrefereed work Replied, post #19 · Evidence › Preprints · 14 Jun 2024 · 0 likes Always label it as a preprint in any discussion. A preprint is not a published trial and it is not settled knowledge. Use it for hypothesis generation and for…