t.brandt

TL2 Moderator · Uppsala

Contributes reviews on supplier material. Based in Uppsala.

Joined 2 December 2024 · last posted 1d

78 posts, newest first. Showing up to 150.

Seven-day rolling means and why weekly readings mislead Replied, post #118 · Outcomes › Progress reports · 26 Jul 2026 · 5 likes post #117 is right about the mechanism and I think understates the practical bit. Plateaus and resets: if weight loss stalls and then resumes, that is ordinary. It is…
Coming back to: Why a preprint's supplementary material is often the best part Replied, post #112 · Evidence › Preprints · 21 Jul 2026 · 2 likes Server repositories: medRxiv for medicine, bioRxiv for biology. Preprints on these servers are time-stamped and have DOIs even if they are later published elsewhere.…
A calculator that gives a right answer to the wrong question Replied, post #33 · Data & Tools › Calculators · 10 Jul 2026 · 10 likes I read post #31 twice before replying, because I had assumed the opposite. Dose equivalence calculator: compounds have different potencies. The calculator is provided…
[2026 update] Regional warehouse stock versus direct despatch Replied, post #118 · Sourcing › Logistics · 30 Jun 2026 · 9 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…
Semaglutide and gastric emptying — the mechanism behind most of the side-effect profile Replied, post #83 · Compounds › Semaglutide · 29 Jun 2026 · 26 likes The opalescent appearance in semaglutide solutions is occasionally noted and the mechanism is unclear. It does not appear to correlate with product failure in practice.…
Publication patterns in the BPC-157 literature, examined Replied, post #18 · Compounds › Repair & healing peptides · 21 Jun 2026 · 10 likes post #17 answers the question as asked. The question underneath it is different. Thank you for the correction. I have edited my earlier post with a note rather than…
Reference intervals: how they are constructed and why one in twenty flags — does this… Replied, post #3 · Clinical › Bloodwork · 7 Jun 2026 · 24 likes Time of day: some biomarkers vary across the day. Cortisol in the morning differs from cortisol in the evening. Comparing results from different times of day is…
A widely repeated interaction claim that turns out to be unsupported — what changed since Replied, post #50 · Practice › Interactions · 24 May 2026 · 13 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…
GLP-1 receptor distribution: central and peripheral Replied, post #53 · Pharmacology › Receptor biology · 20 May 2026 · 2 likes Worth separating two things that post #49 runs together. Glucagon receptor agonism: glucagon receptor agonism increases energy expenditure and promotes hepatic fat…
Why the titration planner refuses to produce a schedule below a floor Replied, post #72 · Data & Tools › Calculators · 11 May 2026 · 16 likes Picking up post #69: that is the part I would want checked first. Reconstitution calculator: enter vial mass, final volume target, and the calculator tells you…
Official shortage notices and what they authorise Replied, post #37 · Access › Shortages · 7 May 2026 · 9 likes I read post #35 twice before replying, because I had assumed the opposite. Dose hold versus tapering: if a temporary shortage forces a gap, holding your dose and…
Personal or family history of medullary thyroid carcinoma — what changed since Replied, post #29 · Safety › Contraindications · 5 May 2026 · 33 likes This follows post #26 rather than contradicting it. Diabetic retinopathy complications: a signal for this was noted in SUSTAIN 6. Current evidence is mixed. The risk is…
Adolescents: a distinct evidence base — one year on Replied, post #84 · Clinical › Special populations · 8 Apr 2026 · 5 likes Coming back to post #82, because the follow-up matters more than the original answer. Adolescents: a distinct evidence base exists. The compounds are not approved for…
Managing an unplanned gap in supply Replied, post #84 · Access › Shortages · 4 Apr 2026 · 32 likes Managing an unplanned gap: if a shortage causes a gap in treatment, the questions are how long the gap will be and how that affects your condition. Discussing with your…
Gastro-oesophageal reflux: improving or worsening? Replied, post #32 · Clinical › Comorbidities · 2 Apr 2026 · 18 likes Worth separating two things that post #28 runs together. Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather…
[2026 update] Publication patterns in the BPC-157 literature, examined Replied, post #20 · Compounds › Repair & healing peptides · 1 Apr 2026 · 19 likes Why plausible mechanism is not evidence of effect: a mechanism that is chemically or biologically plausible can fail in practice for dozens of reasons —…
An ABAB design with a data table and honest limitations — a second dataset Replied, post #50 · Research Methods › N-of-1 designs · 10 Mar 2026 · 30 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…
Air bubbles in a subcutaneous injection: the honest risk assessment — does this still… Replied, post #13 · Practice › Administration · 10 Mar 2026 · 10 likes A site rotation scheme that actually works: abdomen, outer thigh, back of arm, outer hip. Rotate through them in order, move a minimum 2 cm between consecutive sites,…
Half-life, steady state, and accumulation worked through — a second dataset Replied, post #100 · Pharmacology › Pharmacokinetics · 7 Mar 2026 · 2 likes Volume of distribution: the theoretical volume the drug distributes into. For albumin-binding compounds, volume is reduced compared to drugs that do not bind protein.…
Journal club: orforglipron phase 2 and the non-peptide question Replied, post #10 · Evidence › Journal club · 4 Mar 2026 · 14 likes post #9 is right about the mechanism and I think understates the practical bit. I disagree with the reply above, and I think the disagreement is substantive rather than…
Air bubbles in a subcutaneous injection: the honest risk assessment — does this still… Replied, post #7 · Practice › Administration · 2 Mar 2026 · 0 likes Leak-back after withdrawal: a small amount of liquid on the skin after withdrawal is ordinary. Whether you lost a "meaningful" dose depends on concentration and your…
The lowest dose that does anything: is that a real question? Replied, post #9 · Practice › Dosing & titration · 1 Mar 2026 · 11 likes Steady state means the plasma concentration is stable from dose to dose. That happens around 4 to 5 half-lives. Before that, the concentration is rising with each dose.…
Revisiting: Absolute versus relative contraindications Replied, post #34 · Safety › Contraindications · 28 Feb 2026 · 22 likes Disordered eating history: appetite suppression can trigger relapse in people with history of anorexia, bulimia, or other eating disorders. This is a relative…
Measurement error in a self-reported exposure Replied, post #49 · Evidence › Study critique · 24 Feb 2026 · 0 likes Publication bias: a single published positive trial is weaker evidence than multiple published trials with consistent results. Asking whether there are unpublished…
Mass error in ppm: the arithmetic and the caveat Replied, post #95 · Analytics › Mass spectrometry · 15 Feb 2026 · 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.
Follow-up: Search filters: what is missing Replied, post #33 · Meta › Site feedback · 14 Feb 2026 · 0 likes On post #29 — agreed on the reasoning, with one qualification. Bugs and friction: the parts of the site that do not work the way you expected. Report them specifically…
Can a home kit substitute for a laboratory report? A careful no Replied, post #125 · Analytics › Home & field testing · 4 Feb 2026 · 0 likes On post #121 — agreed on the reasoning, with one qualification. Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly…
Coming back to: Semaglutide in people without diabetes: what the evidence base looks like Replied, post #26 · Compounds › Semaglutide · 23 Jan 2026 · 28 likes The mass figure differs between sources because of how the different entities report it. The monoisotopic mass of the bare peptide is one number; the mass including the…
Distinguishing expected GI effects from something that needs urgent attention Replied, post #78 · Practice › Side effects · 11 Jan 2026 · 24 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…
Storing lyophilised material long term: what governs the shelf life Replied, post #13 · Practice › Storage & stability · 2 Jan 2026 · 14 likes Coming back to post #11, because the follow-up matters more than the original answer. Vial integrity: once a vial is entered with a needle repeatedly, the rubber…
Follow-up: Bug report: the reconstitution calculator and a rounding edge case Replied, post #9 · Data & Tools › Calculators · 25 Dec 2025 · 0 likes Picking up post #6: that is the part I would want checked first. I disagree with the reply above, and I think the disagreement is substantive rather than…
The decimal-point error, and the habit that catches it Replied, post #13 · Practice › Reconstitution · 13 Dec 2025 · 0 likes This follows post #10 rather than contradicting it. I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The…
Journal club: how we handle discontinuation in obesity trials — what changed since Replied, post #18 · Evidence › Journal club · 28 Nov 2025 · 11 likes SURMOUNT-OSA (N Engl J Med 2024): Tirzepatide in obstructive sleep apnoea, using an objective physiological endpoint. Notable because soft endpoints are avoided. Two…
Temperature loggers worth the money — the long version Replied, post #72 · Devices › Cold chain · 10 Nov 2025 · 7 likes Freeze-thaw: some peptides tolerate freezing; others do not. Check your compound's labelling. Generally, repeated freeze-thaw is worse than single freeze-thaw.
Sleep tracking data and its considerable limitations Replied, post #55 · Wellbeing › Sleep · 22 Oct 2025 · 0 likes Energy and sleep needs: rapid weight loss increases real metabolic stress. Sleep needs might increase even though appetite for food has decreased. Prioritising sleep is…
Second pass at: Asking a follow-up: new topic or new reply? Replied, post #2 · marked as the solution · Start Here › How to Ask · 19 Oct 2025 · 7 likes Picking up the opening post: that is the part I would want checked first. For anyone arriving from a search: the marked solution above is the direct answer, and the…
Reading SURMOUNT-1 without the press release Replied, post #31 · Compounds › Tirzepatide · 11 Oct 2025 · 18 likes On post #27 — agreed on the reasoning, with one qualification. Storage and stability: published data on licensed tirzepatide formulations exists and is worth reading…
Detection wavelength and why 214 nm and 280 nm disagree Replied, post #54 · Analytics › HPLC & UHPLC · 26 Sep 2025 · 18 likes Picking up post #51: that is the part I would want checked first. Thank you for the correction. I have edited my earlier post with a note rather than silently, so the…
Batch date after test date, and other internal inconsistencies Replied, post #3 · Analytics › COA interpretation · 20 Sep 2025 · 16 likes Worth separating two things that the opening post runs together. Endotoxin testing is separate: a certificate of purity says nothing about endotoxin. A chemically pure…
Reverse causation in a cohort study of weight and outcome — a second dataset Replied, post #91 · Evidence › Study critique · 15 Sep 2025 · 21 likes post #90 answers the question as asked. The question underneath it is different. Generalisability: do the inclusion/exclusion criteria narrow the population so much…
Reverse causation in a cohort study of weight and outcome — a second dataset Replied, post #72 · Evidence › Study critique · 14 Sep 2025 · 1 like Coming back to post #70, because the follow-up matters more than the original answer. Building consensus on which criticisms matter: if everyone agrees that the sample…
Airline travel with a temperature-sensitive injectable Replied, post #2 · Devices › Cold chain · 11 Sep 2025 · 6 likes Shipment during summer or to hot climates: consider shipping to a cold-storage facility rather than to home if temperatures will be high. Alternatively, time shipment…
Revisiting: Reading a denial letter as a specification for your appeal Replied, post #91 · Access › Insurance & coverage · 23 Aug 2025 · 19 likes Coming back to post #89, because the follow-up matters more than the original answer. Prior authorisation: pre-approval requirements and how to satisfy them. Most…
When a preprint is the best available evidence and we say so Replied, post #45 · Evidence › Preprints · 11 Aug 2025 · 16 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…
[2026 update] Cardiovascular risk: reading the outcome trials as a set Replied, post #83 · Clinical › Comorbidities · 31 Jul 2025 · 7 likes Comorbidity control: if a comorbidity (high blood pressure, high lipids) is not adequately controlled, the decision about adding compounds in this class depends on the…
Severe gastroparesis and why this class is a poor fit Replied, post #4 · Safety › Contraindications · 2 Jul 2025 · 11 likes On post #3 — agreed on the reasoning, with one qualification. Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly…
Coming back to: Sample size calculations, read backwards from the published number Replied, post #49 · Evidence › Trials · 1 Jul 2025 · 6 likes Picking up post #46: that is the part I would want checked first. I disagree with the reply above, and I think the disagreement is substantive rather than…
Reporting a disappointing outcome, and why it belongs here Replied, post #17 · Outcomes › Progress reports · 16 Jun 2025 · 23 likes Picking up post #14: that is the part I would want checked first. Rate of change: reporting progress as "lost 5 kg in 12 weeks" is more useful than "currently at 82 kg"…
BPC-157: what the rodent literature actually shows, and what it does not — a second… Replied, post #52 · Compounds › Repair & healing peptides · 31 May 2025 · 4 likes The absence of adequately powered published randomised human trials is the central fact about BPC-157. This site states that plainly rather than hedging. Mechanistic…
Coming back to: Getting a referral rather than a refusal Replied, post #19 · Clinical › Prescriber conversations · 31 May 2025 · 0 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…
Substitution between formats during a shortage Replied, post #2 · Access › Shortages · 23 May 2025 · 15 likes Dose hold versus tapering: if a temporary shortage forces a gap, holding your dose and resuming when supply returns is different from gradually tapering. The two are…
Regression to the mean in progress reports Replied, post #8 · Research Methods › Statistics · 10 May 2025 · 16 likes Multiplicity and multiple comparisons: if you test many hypotheses, the chance of finding a false positive by random chance increases. That is why pre-specifying the…
Airline travel with a temperature-sensitive injectable — what changed since Replied, post #24 · Devices › Cold chain · 5 May 2025 · 0 likes Picking up post #21: that is the part I would want checked first. Temperature excursions: brief excursions above 8 °C are tolerable for most compounds. Hours to a day…
[2026 update] Citation sweep results: how many references did not say what was claimed Replied, post #26 · Meta › Wiki maintenance · 1 May 2025 · 0 likes Authority: if you think a page needs input from someone with specific expertise, suggesting that person helps the maintainer recruit contributors.
Journal club: SUSTAIN 6 and its retinopathy signal — does this still hold? Replied, post #64 · Evidence › Journal club · 28 Mar 2025 · 2 likes post #63 answers the question as asked. The question underneath it is different. SURMOUNT-1 (N Engl J Med 2022): Tirzepatide obesity trial. The largest mean weight…
When to suspect the method rather than the sample Replied, post #103 · Analytics › Method validation · 25 Mar 2025 · 0 likes Coming back to post #101, because the follow-up matters more than the original answer. Transfer between laboratories: a method can be transferred from one lab to…
Biased agonism: a real phenomenon, an over-used explanation Replied, post #99 · Pharmacology › Receptor biology · 15 Mar 2025 · 11 likes Pharmacological class effects: all GLP-1 agonists slow gastric emptying and suppress appetite. Those are class effects, not unique to one compound. Effects that differ…
Introducing myself and asking whether my planned first topic belongs anywhere Replied, post #16 · Start Here › Welcome · 12 Mar 2025 · 0 likes Trust levels accumulate over time and they give you access to small things like the ability to edit your own posts without a timestamp. They are not a status symbol and…
Research-use-only labelling: what it means and what it does not — the long version Replied, post #96 · Sourcing › Regulatory · 2 Mar 2025 · 1 like Why this category is maintained as documentation, not as recommendations: the goal is factual accuracy and sourcing, not endorsement of any specific regulatory position.
Adducts: sodium, potassium, and the peak you did not expect Replied, post #22 · Analytics › Mass spectrometry · 28 Feb 2025 · 3 likes post #21 is right about the mechanism and I think understates the practical bit. For anyone arriving from a search: the marked solution above is the direct answer, and…
Transit times by route, from a logged dataset — the long version Replied, post #64 · Sourcing › Logistics · 26 Feb 2025 · 25 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…
Adjudicated events and why the definition matters — the long version Replied, post #13 · Evidence › Trials · 16 Feb 2025 · 4 likes This follows post #10 rather than contradicting it. Intent-to-treat versus per-protocol: ITT includes everyone assigned regardless of whether they took the drug.…
Second pass at: Regression to the mean in progress reports Replied, post #53 · Research Methods › Statistics · 12 Feb 2025 · 5 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…
Protein density versus volume when you cannot eat much Replied, post #65 · Nutrition & Training › Protein & intake · 4 Feb 2025 · 4 likes Protein supplements: whey, casein, and plant-based protein powders can help hit targets when whole-food intake is limited by appetite. Protein quality (all essential…
Albumin binding and how it produces a long half-life Replied, post #3 · Pharmacology › Pharmacokinetics · 1 Feb 2025 · 12 likes SNAC (the oral bioavailability enhancer): sodium N-(8-[2-hydroxybenzoyl]amino) caprylate transiently raises gastric pH and promotes absorption. Without it, oral…
Journal club: SURMOUNT-1, read without the press release Replied, post #51 · Evidence › Journal club · 28 Jan 2025 · 0 likes post #50 answers the question as asked. The question underneath it is different. TRIUMPH (ongoing): Retatrutide phase 3. No results yet. Nothing should be attributed to…
Coming back to: Recording a dissent on a document rather than suppressing it Replied, post #28 · Documentation › Doc review · 24 Jan 2025 · 23 likes On post #24 — agreed on the reasoning, with one qualification. Revision disputes: if you disagree with an edit a maintainer made to a page, discuss it here. The goal is…
Second pass at: Certificates issued by the seller versus by a laboratory Replied, post #10 · Analytics › COA interpretation · 15 Jan 2025 · 3 likes This follows post #7 rather than contradicting it. Amino acid analysis gives content: it hydrolyses the peptide and quantifies the residues. It measures the peptide…
When "no data" is the complete and final answer Replied, post #49 · Compounds › Other compounds · 24 Dec 2024 · 10 likes Distinguishing marketed research compounds from true chemical synthesis: some online suppliers sell compounds that are genuinely novel and difficult to obtain…
Identical chromatograms across two different lots Replied, post #59 · Sourcing › Red flags · 7 Dec 2024 · 20 likes Rapid supplier turnover: a supplier that changes corporate structure, domain name, or contact repeatedly in short time windows raises suspicion about stability and…
People with a low starting BMI: where the evidence stops Replied, post #21 · Clinical › Special populations · 5 Dec 2024 · 29 likes Pregnancy and planning: these compounds are not approved for use in pregnancy. Planning windows (how long to wait before attempting pregnancy) are not formally…
A page that has drifted out of date and needs a maintainer Replied, post #35 · Documentation › Wiki requests · 2 Dec 2024 · 24 likes Coming back to post #33, because the follow-up matters more than the original answer. Flag a page that has drifted: if you notice a maintained page has information that…
Coming back to: The nausea timeline across the first four weeks, with a tabulated log Replied, post #30 · Practice › Side effects · 27 Nov 2024 · 0 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…
Choosing which test to pay for, given a fixed budget — does this still hold? Replied, post #25 · Sourcing › Independent verification · 9 Nov 2024 · 14 likes Blind sampling: submitting without the laboratory or seller knowing the source removes the two easiest ways for a result to be shaped: selective submission and…
Time to steady state after a dose increase Replied, post #112 · Pharmacology › Pharmacokinetics · 5 Nov 2024 · 6 likes Volume of distribution: the theoretical volume the drug distributes into. For albumin-binding compounds, volume is reduced compared to drugs that do not bind protein.…
Second pass at: Hoarding and why it makes a shortage worse Replied, post #62 · Access › Shortages · 11 Oct 2024 · 4 likes Resuming after a gap: after a gap of days or a few weeks, most people resume at the dose they were on when they stopped. Gaps of months might require retitration…
Coming back to: Pricing far outside the range, in either direction Replied, post #17 · Sourcing › Red flags · 29 Jul 2024 · 13 likes This follows post #14 rather than contradicting it. Exaggerated claims without documentation: every compound has limits. No peptide is "100% pure" because purity is…
Splitting a weekly dose in two: the pharmacokinetic argument against — the long version Replied, post #7 · Practice › Dosing & titration · 6 Jul 2024 · 17 likes Steady state means the plasma concentration is stable from dose to dose. That happens around 4 to 5 half-lives. Before that, the concentration is rising with each dose.…