KAndersson

TL3 Regular · Groningen, NL

Wiki editor. Small, frequent, well-annotated edits.

Joined 15 December 2024 · last posted 20h · groups: wiki-editors

125 posts, newest first. Showing up to 150.

Lean mass preservation: what the evidence supports — does this still hold? Replied, post #123 · Outcomes › Body composition · 27 Jul 2026 · 0 likes DXA on the same machine with the same technician has a least significant change for lean mass of roughly a kilogram, sometimes more. Below that, two scans are the same…
What a certificate commits its issuer to — the long version Replied, post #27 · Analytics › COA interpretation · 26 Jul 2026 · 4 likes Post #24 is right about the mechanism and I think understates the practical bit. Residual solvent screening is not standard on these documents and its presence is a…
Common supplements people ask about, assessed one at a time Replied, post #79 · Practice › Interactions · 21 Jul 2026 · 0 likes Narrowing post #77, because the general version has more than one answer. Gastrointestinal symptoms from one compound can mask or mimic an interaction with another.…
Follow-up: The most useful thing you learned here that was not the answer you came for Replied, post #30 · Lounge › Off topic · 21 Jul 2026 · 5 likes Adjacent and interesting: you might post something about nutrition, bioavailability from a food perspective, or the sociology of weight. Adjacent to this community's…
[2026 update] Travelling with an injectable: documentation and practicalities Replied, post #74 · Access › International · 12 Jul 2026 · 23 likes Regulatory position dates: a regulatory position is only current as of when it was written. Rechecking is prudent, especially if you saw it months ago. A single…
What a certificate commits its issuer to Replied, post #15 · Analytics › COA interpretation · 11 Jul 2026 · 1 like Reading old certificates: if a certificate is dated years ago, the lot it describes might be old. That is not automatically a problem but it is worth noting. Fresh…
Reading a rodent study on a secretagogue without over-extrapolating — the long version Replied, post #32 · Compounds › Secretagogues & GH axis · 10 Jul 2026 · 0 likes Post #28 describes the usual case. This is about the unusual one. Injection-site reactions are reported more often in this family than for the incretins. Whether that…
What is genuinely unknown about long-term amylin agonism Replied, post #5 · Compounds › Cagrilintide & amylin analogues · 5 Jul 2026 · 15 likes On storage: aggregation-prone peptides are the ones where repeated warming and cooling does the most damage, and where a solution that looks fine may already have…
Pages past their review date, listed — does this still hold? Replied, post #38 · Meta › Wiki maintenance · 5 Jul 2026 · 14 likes Small methodological point on Pages past: repeating a measurement is cheap and resolves most of what is being argued about here at no cost to anyone.
A site rotation scheme that is easy enough to actually follow — a second dataset Replied, post #2 · Practice › Administration · 25 Jun 2026 · 32 likes A new needle for each injection is not fussiness. A needle blunts on first use and a blunted needle is the reason the second injection hurts more than the first. Anyone…
Coming back to: A structured critique template this community uses Replied, post #41 · Evidence › Study critique · 24 Jun 2026 · 0 likes This follows post #40 rather than contradicting it. Building consensus on which criticisms matter: if everyone agrees that the sample size is small but only you think…
Coming back to: Why a preprint's supplementary material is often the best part Replied, post #86 · Evidence › Preprints · 22 Jun 2026 · 0 likes Where I part company with post #82, and it is a narrow parting. Building anything durable on a preprint means committing to rebuild it. That is a reasonable trade for a…
What a certificate commits its issuer to — the long version Replied, post #16 · Analytics › COA interpretation · 19 Jun 2026 · 14 likes An itemised related-substances table with retention times says considerably more about the synthesis than a single total. A total tells you how much is not the main…
Programming during a large energy deficit Replied, post #19 · Nutrition & Training › Resistance training · 17 Jun 2026 · 0 likes Programming while losing weight quickly: realistic expectations are crucial. Strength often stays surprisingly stable; power output might decline slightly. Expecting…
Injecting into an area that has become firm: why not to Replied, post #78 · Practice › Administration · 15 Jun 2026 · 25 likes Everything in post #74 holds. The case it does not cover is the one I have. Letting a refrigerated preparation come to room temperature before injecting reduces the…
Review: a draft on reconstitution arithmetic, with objections — one year on Replied, post #26 · Documentation › Doc review · 11 Jun 2026 · 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…
Does dual agonism explain the effect size, or is it dose? Replied, post #26 · Compounds › Tirzepatide · 10 Jun 2026 · 3 likes Since dual agonism keeps coming up, it should probably be a maintained page rather than a recurring thread. I am happy to draft it if someone with more direct…
Primary endpoint hierarchies and why order matters — one year on Replied, post #9 · Evidence › Trials · 7 Jun 2026 · 8 likes Absolute and relative effects answer different questions. Write down the event rate in each arm and the difference between them; everything quotable is derived from…
Comparing prices across jurisdictions without misleading yourself Replied, post #35 · Access › Pricing · 3 Jun 2026 · 0 likes Nothing here is financial advice and none of it is a route to a transaction. That is the version I use. It may not be the version that is correct.
Journal club: the CagriSema phase 2 combination paper Replied, post #2 · Evidence › Journal club · 1 Jun 2026 · 0 likes This is the answer, and the reason it is the answer is the more useful part.
Molecular mass of semaglutide and why the figure differs between sources Replied, post #68 · Compounds › Semaglutide · 31 May 2026 · 28 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.…
Interim analyses and stopping rules Replied, post #23 · Evidence › Trials · 15 May 2026 · 18 likes Where I part company with post #20, and it is a narrow parting. Absolute numbers, not just relative: a 30% relative reduction tells you the ratio but not the practical…
Revisiting: Theoretical plates: useful number or ritual? Replied, post #7 · Analytics › HPLC & UHPLC · 13 May 2026 · 24 likes This follows post #6 rather than contradicting it. Injection volume matters because column overload distorts peak shape, and an overloaded main peak can swallow a small…
How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ — does this still hold? Replied, post #13 · Sourcing › Independent verification · 13 May 2026 · 4 likes Answering the question post #11 raises rather than the one it answers. Janoshik Analytical: chromatographic purity and mass-spectrometric identity on submitted samples.…
Coming back to: Specificity, linearity, accuracy, precision, range, robustness — with… Replied, post #14 · Analytics › Method validation · 6 May 2026 · 1 like Linearity across the working range is a routine demonstration and it constrains how far a result can be extrapolated. A method linear from 80 to 120 per cent of nominal…
Request: show the solution author in the topic list — what changed since Started this topic · Meta › Feature requests · 29 Apr 2026 · 29 likes Request: show the solution author in the topic list — what changed since — setting out what I have, and where I think it stops being reliable. Bringing the figures…
Analytical identity of BPC-157: a 15-mer with a simple mass — does this still hold? Replied, post #20 · Compounds › Repair & healing peptides · 19 Apr 2026 · 0 likes Confirming post #17 from a second method, which matters more than confirming it from a second person. Where I would push back on the Analytical identity of BPC-157…
Molecular mass of semaglutide and why the figure differs between sources Replied, post #37 · Compounds › Semaglutide · 15 Apr 2026 · 0 likes Nausea is dose-related and adaptation-related, and both are true at once. The pattern most people describe is a return of symptoms at each escalation followed by…
[2026 update] Does a peptide degrade silently, with no visual change? Replied, post #47 · Practice › Storage & stability · 15 Apr 2026 · 12 likes On peptide, I would rather understate and be corrected upward than overstate and be quoted. That is a house style here and it is a good one.
A payment that went through twice: how it was resolved Replied, post #24 · Sourcing › Payments · 15 Apr 2026 · 10 likes Reading rather than answering, but this is the post I would point somebody at.
Personal or family history of medullary thyroid carcinoma — what changed since Replied, post #10 · Safety › Contraindications · 14 Apr 2026 · 0 likes Allergy to the specific compound: true allergy is rare but possible. Any prior allergic reaction to the same compound or to structurally similar peptides warrants…
[2026 update] Charge states for a 4 kDa peptide, worked through Replied, post #45 · Analytics › Mass spectrometry · 31 Mar 2026 · 7 likes The arithmetic in post #43 is right; the assumption feeding it is the part to check. Electrospray on a peptide of this size gives a multiply charged series rather than…
Stepping down deliberately, and how to do it without losing progress Replied, post #78 · Practice › Dosing & titration · 22 Mar 2026 · 2 likes Post #76 put the caveat in the right place and I want to underline it. The most common practical error is not the schedule at all — it is losing track of which step you…
A widely repeated interaction claim that turns out to be unsupported Replied, post #38 · Practice › Interactions · 21 Mar 2026 · 33 likes Insulin and sulfonylureas are the interaction that the labelling in this class flags most explicitly, because the risk is additive glucose lowering. That is a…
Warfarin and altered intake: the monitoring argument — the long version Replied, post #133 · Practice › Interactions · 15 Mar 2026 · 11 likes Post #131 is the version of this I will quote in future. One addition. Since Warfarin and altered intake keeps coming up, it should probably be a maintained page rather…
Pharmacy supply in the UK and the questions you will be asked Replied, post #77 · Regional › UK & Ireland · 15 Mar 2026 · 25 likes The version of pharmacy supply that I was taught turned out to be a teaching simplification. Useful, and not true in the way I had assumed it was.
Dizziness on standing and the electrolyte explanation — does this still hold? Replied, post #51 · Practice › Side effects · 28 Feb 2026 · 3 likes This follows post #48 rather than contradicting it. The relationship between symptom burden and outcome is not what people assume. Feeling worse is not evidence of a…
Second pass at: Fasting versus non-fasting and which tests care Replied, post #15 · Clinical › Bloodwork · 23 Feb 2026 · 1 like Saving this. It is the version I will quote when the question comes round again.
Specification in the result column: why that is a meaningful error Replied, post #123 · Analytics › COA interpretation · 16 Feb 2026 · 6 likes When method identifiers are missing: "reversed-phase HPLC" is less specific than "reversed-phase HPLC at 214 nm on a C18 column with a 10 to 40% acetonitrile gradient…
Mass error in ppm: the arithmetic and the caveat Replied, post #112 · Analytics › Mass spectrometry · 15 Feb 2026 · 9 likes Adding the measurement that post #110 says would settle it. Trifluoroacetate adducts are common in material purified with TFA and are one reason a mass spectrum from a…
Storing lyophilised material long term: what governs the shelf life Replied, post #60 · Practice › Storage & stability · 11 Feb 2026 · 0 likes Door storage in a refrigerator is the warmest and most variable position in the appliance. A shelf at the back is a materially different environment.
[2026 update] Confounding by indication, explained with a concrete example Replied, post #42 · Evidence › Study critique · 10 Feb 2026 · 0 likes Per-protocol and intention-to-treat analyses answer different questions and neither is the honest one by default. Reporting both is the practice worth insisting on.
Coming back to: Reading a supplier's product description as a marketing document Replied, post #18 · Compounds › Other compounds · 8 Feb 2026 · 0 likes Where a compound has a legitimate pharmaceutical form somewhere in the world, the labelling for that form is usually the single most useful document available and is…
Pharmacy supply in the UK and the questions you will be asked Replied, post #28 · Regional › UK & Ireland · 2 Feb 2026 · 0 likes Post #26 put the caveat in the right place and I want to underline it. Clinical guidance published for prescribers is public and answers most eligibility questions here…
What a good consultation looks like from the other side Replied, post #12 · Clinical › Prescriber conversations · 26 Jan 2026 · 0 likes The number people quote for good consultation is a central estimate presented without its interval, and the interval is wide enough that the estimate is nearly…
Temperature loggers worth the money — the long version Replied, post #118 · Devices › Cold chain · 22 Jan 2026 · 31 likes Domestic refrigeration: most lyophilised peptides are stored at 2–8 °C (35–46 °F). That is standard refrigerator temperature. Check your refrigerator's actual…
Measurement error in home scales, with a worked standard deviation — the long version Replied, post #17 · Research Methods › Statistics · 22 Jan 2026 · 0 likes Where I part company with post #15, and it is a narrow parting. The most common statistical error in this community is not technical: it is treating a self-selected…
Foaming during reconstitution and whether it matters — the long version Replied, post #10 · Practice › Reconstitution · 16 Jan 2026 · 9 likes Nothing to add on the substance. Thank you for taking the question at face value.
Lyophilisation and why the cake looks the way it does Replied, post #32 · Pharmacology › Formulation chemistry · 31 Dec 2025 · 12 likes Building on post #31 rather than restating it. On lyophilisation I would separate what is worth knowing from what is worth acting on. The first list is long and the…
Vomiting: when it is expected and when it is a reason to stop Replied, post #102 · Practice › Side effects · 30 Dec 2025 · 7 likes Post #99 answers the question as asked. The question underneath it is different. Severe, persistent abdominal pain, especially radiating to the back, is in a different…
A history of disordered eating: proceeding carefully Replied, post #36 · Wellbeing › Mental health · 22 Dec 2025 · 20 likes My experience of history of disordered eating contradicts the reply above. I am posting it as a data point rather than as a refutation, because one person's experience…
Follow-up: A supplier that answers analytical questions with restated claims Replied, post #17 · Sourcing › Red flags · 16 Dec 2025 · 23 likes Being wrong in public about a supplier is costly to that supplier and to the person who was wrong. That is why the evidence standard is what it is.
The decimal-point error, and the habit that catches it Replied, post #58 · Practice › Reconstitution · 16 Dec 2025 · 0 likes 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. The…
Can a home kit substitute for a laboratory report? A careful no Replied, post #78 · Analytics › Home & field testing · 14 Dec 2025 · 6 likes I would be cautious about generalising from the home kit substitute example above. It is a good example. It is one example.
Storing in the door of the fridge is worse than you think Replied, post #2 · marked as the solution · Practice › Storage & stability · 12 Dec 2025 · 7 likes The opening post is the version of this I will quote in future. One addition. What is reasonably well supported: refrigeration slows degradation, repeated warming and…
Robustness: the parameters worth deliberately varying Replied, post #55 · Analytics › Method validation · 10 Dec 2025 · 9 likes Where a pharmacopoeial monograph exists, a method that follows it inherits a great deal of assurance. Almost nothing discussed here has one. I am not the right person…
Constipation management, with a dietitian's contribution Replied, post #7 · Practice › Side effects · 4 Dec 2025 · 0 likes The failure mode on constipation management is boring rather than dramatic. It is almost always the step everyone assumes was done correctly because it is too simple to…
Liver enzymes drifting down and what that usually means Replied, post #32 · Clinical › Bloodwork · 30 Nov 2025 · 1 like Analytical imprecision: any measurement has an error margin. A small difference in consecutive tests is usually measurement noise, not a real change. Knowing the…
[2026 update] How much of the diluent volume the powder itself displaces Replied, post #54 · Practice › Reconstitution · 25 Nov 2025 · 0 likes Add the diluent down the side of the vial rather than directly onto the cake. It is slower and it avoids the foaming that makes people think something has gone wrong.
Specification in the result column: why that is a meaningful error Replied, post #69 · Analytics › COA interpretation · 6 Nov 2025 · 0 likes The distinction between release testing and characterisation is one industrial documents make and retail ones usually do not. It is the difference between "we tested…
The anatomy of a question that gets answered within an hour — the long version Replied, post #46 · Start Here › How to Ask · 1 Nov 2025 · 6 likes Post #44 is right about the mechanism and I think understates the practical bit. Post the arithmetic you already did. Half the questions here are answered by someone…
SURMOUNT-4 and what withdrawal data does and does not tell an individual — one year on Replied, post #19 · Compounds › Tirzepatide · 19 Oct 2025 · 8 likes Post #17 put the caveat in the right place and I want to underline it. Reporting rather than recommending, on SURMOUNT-4. What happened is above. Whether it should have…
New subcategory: rationale and scope Started this topic · Meta › Announcements · 10 Oct 2025 · 21 likes On the subject in the title: New subcategory: rationale and scope Working notes rather than a conclusion. Proposing that new subcategory deserves a maintained page…
A 10 mg vial reconstituted three different ways, compared — the long version Replied, post #139 · Practice › Reconstitution · 6 Oct 2025 · 28 likes I had read the opposite somewhere and cannot now find where, which tells me something.
Cagrilintide's dosing interval and the pharmacokinetics behind it Replied, post #81 · Compounds › Cagrilintide & amylin analogues · 4 Oct 2025 · 0 likes On post #77 — agreed on the reasoning, with one qualification. On storage: aggregation-prone peptides are the ones where repeated warming and cooling does the most…
The most useful thing you learned here that was not the answer you came for — a second… Replied, post #57 · Lounge › Off topic · 25 Sep 2025 · 12 likes Following, with nothing to contribute beyond having asked the same thing elsewhere.
What this community means by "a source", in practical terms Replied, post #114 · Start Here › Welcome · 15 Sep 2025 · 3 likes If you want a fast orientation, read three solved topics in the subcategory you care about. Solved means somebody said the answer worked, which is more signal than…
Fatigue in the first month: how much is the drug and how much is intake — what changed… Replied, post #76 · Practice › Side effects · 6 Sep 2025 · 2 likes Smaller meals, less fat, slower eating and stopping earlier than feels natural are the interventions most consistently described as helping. None of them are drug…
Temperature loggers worth the money — the long version Replied, post #35 · Devices › Cold chain · 4 Sep 2025 · 23 likes Everything in post #33 holds. The case it does not cover is the one I have. Lyophilised material is far more tolerant of a warm transit than a solution would be, which…
Are there stupid questions here? A staff answer, at length Replied, post #144 · Start Here › Welcome · 2 Sep 2025 · 7 likes Marked solutions are the site's way of saying that someone asked a good question and someone else gave an answer that actually worked. It is not a competition and it…
Pinch or no pinch, and how needle length changes the answer Replied, post #42 · Practice › Administration · 1 Sep 2025 · 12 likes What I would tell a new member reading about pinch for the first time: the confident posts are not the reliable ones, and the reliable ones are longer.
Coming back to: Resolution and tailing factor: real acceptance criteria Replied, post #42 · Analytics › HPLC & UHPLC · 20 Aug 2025 · 1 like I had written a reply contradicting post #38 and deleted it. Here is what survived. An update on my earlier Resolution and tailing factor post: the pattern held for…
Appeal templates and why they are deliberately unemotional Replied, post #10 · Access › Insurance & coverage · 6 Aug 2025 · 0 likes Worth separating two things that post #6 runs together. I would put moderate confidence on the mainstream reading of appeal templates and no more. That is not…
A ten-fold dose error caught before injection — one year on Replied, post #20 · Devices › Syringes & needles · 1 Aug 2025 · 0 likes Building on post #18 rather than restating it. Buying a box of the wrong barrel size is the most common regret described in this subcategory, and the reason is nearly…
What this community means by "a source", in practical terms Replied, post #48 · Start Here › Welcome · 26 Jul 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…
Reading a supplier's product description as a marketing document Replied, post #46 · Compounds › Other compounds · 18 Jul 2025 · 8 likes Post #44 put the caveat in the right place and I want to underline it. Fragment compounds — where the material is part of a larger natural protein — should be…
Forced degradation studies: designing one that is informative — does this still hold? Replied, post #40 · Analytics › Method validation · 16 Jul 2025 · 17 likes System suitability is the ongoing evidence that a validated method is still performing. Validation is done once; suitability is done every run, and it is the one that…
Revisiting: What to include when your question involves arithmetic Replied, post #21 · Start Here › How to Ask · 15 Jul 2025 · 9 likes Chromatography questions need the method before anything else: column, gradient, wavelength, injection volume. A purity figure with no method attached cannot be…
Detection wavelength and why 214 nm and 280 nm disagree Replied, post #17 · Analytics › HPLC & UHPLC · 11 Jul 2025 · 24 likes On post #16 — agreed on the reasoning, with one qualification. Detection wavelength was covered in the wiki last year and the page has a review date on it, which is a…
Revisiting: German, French and Dutch differences, compared Replied, post #37 · Regional › European Union · 24 Jun 2025 · 26 likes That is a fair summary of where the discussion has got to.
Specificity, linearity, accuracy, precision, range, robustness — with real criteria — a… Replied, post #9 · Analytics › Method validation · 24 Jun 2025 · 0 likes Robustness: the method gives consistent results when minor parameters vary. Tested by deliberately varying pH, temperature, flow rate, and mobile phase composition…
Splitting a vial for two laboratories: how to do it without ruining both Replied, post #63 · Sourcing › Independent verification · 16 Jun 2025 · 0 likes The thing about splitting a vial that took me longest to accept is that a plausible mechanism is not evidence of an effect. It is a reason to look, not a result.
What this community means by "a source", in practical terms Replied, post #7 · Start Here › Welcome · 15 Jun 2025 · 12 likes If you want a fast orientation, read three solved topics in the subcategory you care about. Solved means somebody said the answer worked, which is more signal than…
Coming back to: Getting a referral rather than a refusal Replied, post #54 · Clinical › Prescriber conversations · 10 Jun 2025 · 15 likes A question phrased as "what would you want to see before considering X" is answerable and is not a request for X. This is the sort of thing that ought to be settled and…
A well-designed study with a badly written abstract Replied, post #108 · Evidence › Study critique · 26 May 2025 · 23 likes My position on well-designed study is current rather than settled. I have revised it once already and I expect to again, so treat it accordingly.
DXA precision and the least significant change for lean mass — the long version Replied, post #96 · Outcomes › Body composition · 25 May 2025 · 0 likes Preserving lean tissue during a substantial deficit depends on protein intake and a resistance stimulus, and the evidence for both is reasonably strong.
Second pass at: Retatrutide mass and identity: what a report should show Replied, post #49 · Compounds › Retatrutide · 22 May 2025 · 13 likes Where the Retatrutide mass and identity discussion usually stalls is that nobody wants to say "I do not know" and everyone is willing to say "it varies". Those are the…
Delayed gastric emptying and oral medication absorption: which drugs matter Replied, post #83 · Practice › Interactions · 13 May 2025 · 6 likes Post #82 is right about the mechanism and I think understates the practical bit. Thyroid medications: semaglutide is associated with a slowing of gastric emptying,…
A well-designed study with a badly written abstract Replied, post #50 · Evidence › Study critique · 29 Apr 2025 · 3 likes A criticism that would apply equally to every trial in the field is worth stating once and is not a reason to discount a particular paper. This is the version I would…
Follow-up: Documentation that appears only after payment Replied, post #18 · Sourcing › Red flags · 24 Apr 2025 · 26 likes Patterns that reliably precede a problem: underdosing (less active material than stated, documented by independent testing), mislabelling (wrong compound, wrong…
Second pass at: Gauge and length selection for subcutaneous injection Replied, post #57 · Devices › Syringes & needles · 20 Apr 2025 · 16 likes Answering the question post #54 raises rather than the one it answers. What I would check first on Gauge and length selection is whether the thing being measured moved…
BPC-157: what the rodent literature actually shows, and what it does not — a second… Replied, post #28 · Compounds › Repair & healing peptides · 28 Mar 2025 · 9 likes This is the first time the answer has come with its own limits attached. Appreciated.
Second pass at: Retatrutide mass and identity: what a report should show Replied, post #10 · Compounds › Retatrutide · 27 Mar 2025 · 0 likes I would put moderate confidence on the mainstream reading of Retatrutide mass and identity and no more. That is not scepticism for its own sake; it is where the…
Charge states for a 4 kDa peptide, worked through Replied, post #86 · Analytics › Mass spectrometry · 12 Mar 2025 · 0 likes The strongest argument against my own position on charge states, stated as well as I can state it, since nobody else has yet.
The CagriSema phase 2 paper and what a fixed combination buys Replied, post #18 · Compounds › Cagrilintide & amylin analogues · 11 Mar 2025 · 15 likes Sensible. I would want the same detail before I acted on it either.
Charge states for a 4 kDa peptide, worked through Replied, post #65 · Analytics › Mass spectrometry · 10 Mar 2025 · 3 likes Taking post #64 at face value and following it one step further. The arithmetic for a doubly charged species is (M + 2 x 1.00728) / 2, and the analogous expression for…
Consistent declarations and why they matter more than clever ones Replied, post #146 · Sourcing › Logistics · 8 Mar 2025 · 7 likes Consistent declarations: I have looked for the primary source twice and failed twice. Either it does not exist or it is somewhere I do not know to look, and I would…
[2026 update] What the GIP component of tirzepatide is thought to contribute, and how… Replied, post #16 · Compounds › Tirzepatide · 20 Feb 2025 · 13 likes Mass and charge states: tirzepatide is about 4813.5 Da and on an electrospray instrument you would expect to see charge states mostly in the 2+ to 4+ range, the same as…
BPC-157: what the rodent literature actually shows, and what it does not — a second… Replied, post #15 · Compounds › Repair & healing peptides · 16 Feb 2025 · 23 likes Oral versus injected administration claims for BPC-157: the preclinical work studied injection. Oral claims are common in supplier marketing and poorly supported by…
Foaming during reconstitution and whether it matters Replied, post #4 · Practice › Reconstitution · 16 Feb 2025 · 0 likes Bacteriostatic water contains benzyl alcohol; sterile water for injection does not. The difference matters when a container will be entered repeatedly over days and…
Follow-up: Attributing a new peak: degradation product or excipient? Replied, post #9 · Analytics › Impurities & related substances · 16 Feb 2025 · 0 likes Everything in post #5 holds. The case it does not cover is the one I have. Answering the Attributing a new peak question as asked, then the question I think is meant.…
Oxidation and deamidation mass shifts, tabulated Replied, post #54 · Analytics › Mass spectrometry · 14 Feb 2025 · 0 likes Monoisotopic and average mass are different numbers and both appear on documents. At this molecular weight the difference is a few daltons, which is more than the…
Consistent declarations and why they matter more than clever ones Replied, post #29 · Sourcing › Logistics · 13 Feb 2025 · 0 likes Peak periods and public holidays affect this more than any other factor and are entirely predictable in advance. I have kept the units in throughout, for the obvious…
Second pass at: Triple agonism: additive, synergistic, or neither? Replied, post #13 · Compounds › Retatrutide · 9 Feb 2025 · 21 likes Triple agonism 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 of a thread.
Random versus fixed effects: choosing rather than defaulting — a second dataset Replied, post #8 · Evidence › Meta-analyses · 26 Jan 2025 · 20 likes I had written a reply contradicting post #4 and deleted it. Here is what survived. Number needed to treat from a meta-analysis: can be computed from the pooled estimate…
Recovery when intake is low: what to cut first Replied, post #2 · Nutrition & Training › Resistance training · 8 Jan 2025 · 0 likes Picking up the opening post: that is the part I would want checked first. Nothing here is medical advice and anybody with a relevant condition should have a programme…
Fixed versus detachable needles: the trade-offs Replied, post #92 · Devices › Syringes & needles · 5 Jan 2025 · 0 likes Needle length: typical lengths for subcutaneous injection are 4-6 mm (short), 8 mm (standard), or 10-12 mm (longer). Longer needles are needed for deeper tissue or if…
Revisiting: Semaglutide formulation: what is in the licensed product besides the peptide Replied, post #75 · Compounds › Semaglutide · 3 Jan 2025 · 21 likes Counter-ion form matters for the arithmetic and is almost never stated. A vial labelled 5 mg of peptide as an acetate salt and one labelled 5 mg as trifluoroacetate do…
Dose numbers for oral formulations are not comparable to injectable ones — a second… Replied, post #6 · Compounds › Oral incretins · 29 Dec 2024 · 0 likes Dose equivalence between oral and injectable formulations is not a simple conversion and no published factor should be used as one. The two were developed and titrated…
Oral semaglutide bioavailability and its variability between people — a second dataset Replied, post #61 · Compounds › Oral incretins · 27 Dec 2024 · 19 likes Missed doses behave differently for a daily oral than for a weekly injection. With a short interval you are near a trough rather than perturbing a slowly moving…
Domestic fridge temperature mapping: a cheap experiment — what changed since Replied, post #27 · Devices › Cold chain · 26 Dec 2024 · 23 likes Practical note on Domestic fridge temperature mapping: write down what you expect before you look. The number of times I have found what I went looking for is higher…
Oxidation and deamidation mass shifts, tabulated Replied, post #18 · Analytics › Mass spectrometry · 11 Dec 2024 · 1 like Practical note on oxidation and deamidation mass shifts: write down what you expect before you look. The number of times I have found what I went looking for is higher…
[2026 update] How to read a forest plot, properly, from scratch Replied, post #21 · Evidence › Trials · 7 Dec 2024 · 0 likes Building on post #18 rather than restating it. A treatment-policy estimand asks what happens to people assigned to a strategy, including those who abandon it. A…
Training through a dose escalation week Started this topic · Nutrition & Training › Resistance training · 15 Nov 2024 · 15 likes Training through a dose escalation week — setting out what I have, and where I think it stops being reliable. What changes if the standard account of training through a…
Second pass at: Reimbursement variation across member states Replied, post #29 · Regional › European Union · 7 Nov 2024 · 28 likes Post #27 is right about the mechanism and I think understates the practical bit. Say which member state. A statement true in one is regularly false in another and the…
Time to steady state after a dose increase Replied, post #76 · Pharmacology › Pharmacokinetics · 4 Nov 2024 · 0 likes Post #73 answers the question as asked. The question underneath it is different. Metabolism for peptide drugs is proteolytic rather than hepatic in the usual sense,…
Irish differences from the UK position Started this topic · Regional › UK & Ireland · 17 Sep 2024 · 56 likes Posting this under the heading it deserves: Irish differences from the UK position Everything below is what sits behind that. Trying to establish the boundary…
Second pass at: Sodium, potassium and magnesium when intake drops Replied, post #82 · Nutrition & Training › Hydration & electrolytes · 8 Sep 2024 · 16 likes Saving this. It is the version I will quote when the question comes round again.
Follow-up: A site rotation scheme that is easy enough to actually follow Replied, post #9 · Practice › Administration · 4 Sep 2024 · 16 likes Bleeding at the injection site: normal and usually minimal. A little blood at the needle site after withdrawal is not a reason to assume you lost a significant dose.…
Follow-up: Where the four-week escalation interval comes from, and what it is not Replied, post #52 · Practice › Dosing & titration · 27 Aug 2024 · 18 likes There is no published evidence about slower escalation because nobody studied it. That means the trials support not going faster and are silent on going slower, which…
Circumference measurements as a poor man's composition estimate Replied, post #69 · Outcomes › Body composition · 15 Aug 2024 · 18 likes Distinguishing three things in the circumference measurements discussion that keep getting used interchangeably: the observation, the proposed mechanism, and the…
Guidelines revision: what changed and why Replied, post #106 · Meta › Announcements · 28 Jul 2024 · 4 likes Post #102 put the caveat in the right place and I want to underline it. Reading the changed pages: the diff is smaller than the announcement implies, which is…
Second pass at: Retatrutide dose escalation in the published trials Replied, post #68 · Compounds › Retatrutide · 20 Jul 2024 · 2 likes The hepatic-steatosis rationale follows directly from glucagon receptor agonism promoting fat oxidation in the liver. Mechanistic plausibility in this field has a poor…
Follow-up: Conditions that change the calculus rather than forbidding it Replied, post #13 · Safety › Contraindications · 18 Jul 2024 · 4 likes A history of pancreatitis appears in the cautions and the decision around it needs somebody who knows the history rather than a general rule. Where I would look next,…
How this community labels and discusses unrefereed work Replied, post #12 · Evidence › Preprints · 10 Jun 2024 · 0 likes Unrefereed work is not worthless and a great deal of it survives review substantially unchanged. That is the accurate framing and it is not a licence to treat it as…