n.kaufmann

TL2 · Split

Contributes reviews on supplier material. Based in Split.

Joined 13 January 2025 · last posted 15h

79 posts, newest first. Showing up to 150.

Why pulsatile secretion matters for interpreting secretagogue claims Replied, post #10 · Compounds › Secretagogues & GH axis · 27 Jul 2026 · 0 likes What a well-designed human trial of a secretagogue would look like: randomised, placebo-controlled, adequate sample size, IGF-1 as primary outcome, muscle and strength…
GLP-1 receptor distribution: central and peripheral Replied, post #97 · Pharmacology › Receptor biology · 24 Jul 2026 · 6 likes Amylin signalling reaches satiety through a distinct receptor complex, which is the mechanistic basis for expecting an amylin analogue and an incretin agonist to add…
Specificity, linearity, accuracy, precision, range, robustness — with real criteria Replied, post #45 · Analytics › Method validation · 18 Jul 2026 · 16 likes Post #43 put the caveat in the right place and I want to underline it. Forced degradation under acid, base, oxidation, heat and light is how specificity is actually…
An 18-month record including the parts that went badly Replied, post #71 · Outcomes › Progress reports · 16 Jul 2026 · 2 likes The reason 18-month record is hard to answer is that the obvious measurement and the relevant quantity are not the same thing, and substituting one for the other is…
Private prescribing in the UK: what is actually involved Replied, post #66 · Regional › UK & Ireland · 16 Jul 2026 · 9 likes Reading back through, this was answered upthread and I missed it. My fault.
Angle of injection and whether 90 degrees is always right — the long version Replied, post #46 · Practice › Administration · 14 Jul 2026 · 0 likes Post #43 is right about the mechanism and I think understates the practical bit. Drawing up with one needle and injecting with another: a reasonable practice if you…
Follow-up: Reading an interaction checker output critically Replied, post #36 · Practice › Interactions · 8 Jul 2026 · 7 likes Absence of an interaction study is not evidence of no interaction. A great many combinations discussed here have simply never been studied, and saying so is more useful…
Spreadsheets: an appreciation — what changed since Replied, post #93 · Lounge › Off topic · 7 Jul 2026 · 33 likes Agreed, and the corollary is that a place with no visible corrections is not a place with fewer errors.
Review: a draft on reconstitution arithmetic, with objections — one year on Replied, post #39 · Documentation › Doc review · 5 Jul 2026 · 20 likes Reading back through, this was answered upthread and I missed it. My fault.
Reading a home test result without over-claiming Replied, post #93 · Analytics › Home & field testing · 25 Jun 2026 · 17 likes Two people in this thread mean different things by reading a home test result and are disagreeing about the definition while believing they are disagreeing about the…
Second pass at: The storage lookup and where its data comes from Replied, post #34 · Data & Tools › Calculators · 21 Jun 2026 · 0 likes Narrowing post #33, because the general version has more than one answer. Adding a null result on storage lookup. I looked, carefully, and found nothing, and null…
Batch numbers that do not match the vial label — what changed since Replied, post #38 · Sourcing › Red flags · 15 Jun 2026 · 11 likes Adding the measurement that post #37 says would settle it. Where somebody posts a concern, ask what would resolve it before arguing about it. Half of these threads end…
[2026 update] A vial that will not fully dissolve: what to check and in what order Replied, post #109 · Practice › Reconstitution · 15 Jun 2026 · 14 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. That is what…
Micronutrient adequacy at low total intake Replied, post #64 · Nutrition & Training › Protein & intake · 11 Jun 2026 · 6 likes Distribution across the day appears to matter less than total for most outcomes, and it matters practically because a single large meal is harder when appetite is…
Peak-to-trough ratio at steady state for a weekly agent Replied, post #40 · Pharmacology › Pharmacokinetics · 2 Jun 2026 · 17 likes Fair, and the limits you put on it are the part I will remember.
Prescription portability between countries Replied, post #51 · Access › International · 2 Jun 2026 · 27 likes Picking up post #48: that is the part I would want checked first. Prescription portability between countries: I would want to see the raw numbers rather than the…
A 5 mg vial and a 0.25 mg dose: the arithmetic in full Replied, post #51 · Practice › Reconstitution · 19 May 2026 · 3 likes Dead volume is the part nobody mentions until it costs them a dose. A fixed-needle insulin syringe holds very little; a detachable-needle luer configuration can hold…
Reading a trial's population section before its results Replied, post #23 · Evidence › Trials · 15 May 2026 · 0 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),…
Tracking intake honestly when appetite is absent Replied, post #12 · Nutrition & Training › Protein & intake · 30 Apr 2026 · 0 likes Building on post #11 rather than restating it. Answering the tracking intake question as asked, then the question I think is meant. As asked: yes, with the…
What "marked as solution" means and who gets to mark it — does this still hold? Replied, post #67 · Start Here › Welcome · 17 Apr 2026 · 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…
List price versus negotiated price versus what you pay Replied, post #93 · Access › Pricing · 16 Apr 2026 · 15 likes Coming back to post #91, because the follow-up matters more than the original answer. What I would check first on list price versus negotiated price is whether the…
List price versus negotiated price versus what you pay Replied, post #78 · Access › Pricing · 14 Apr 2026 · 32 likes Reading back through, this was answered upthread and I missed it. My fault.
Second pass at: What a 2 ppm match establishes, and what it does not Replied, post #2 · Analytics › Mass spectrometry · 10 Apr 2026 · 31 likes Building on the opening post rather than restating it. Calibration matters: a high-resolution instrument out of calibration can report mass with ppm error large enough…
Does a peptide degrade silently, with no visual change? Replied, post #4 · Practice › Storage & stability · 1 Apr 2026 · 3 likes Visible particulate is a strong signal in the other direction: it is a reason to stop and ask rather than to filter and proceed. Same conclusion as the reply above,…
Subgroup analyses: pre-specified versus discovered — a second dataset Replied, post #25 · Evidence › Trials · 29 Mar 2026 · 6 likes Thank you for the correction. I would rather find out here than later.
Why retatrutide discussion here is more cautious than elsewhere Replied, post #4 · marked as the solution · Compounds › Retatrutide · 29 Mar 2026 · 22 likes Retatrutide is investigational. Anything obtained outside a trial is by definition research-use-only material with no human-use authorisation. This site will state that…
Price changes over 2025 and 2026, tabulated and dated — does this still hold? Replied, post #117 · Access › Pricing · 16 Mar 2026 · 9 likes Price differences within a market are usually about scale, documentation and logistics rather than about anything mysterious. It took me longer than it should have to…
Second pass at: Temperature logging at home: what is worth the effort Replied, post #4 · Practice › Storage & stability · 13 Mar 2026 · 1 like Useful. I have added it to my own notes with the date on it.
Nausea profile of amylin analogues compared with GLP-1 agonists Replied, post #22 · Compounds › Cagrilintide & amylin analogues · 23 Feb 2026 · 5 likes Picking up post #21: that is the part I would want checked first. Nausea profile of amylin analogues came up in a thread eighteen months ago and was answered well. I…
Pinch or no pinch, and how needle length changes the answer — the long version Replied, post #20 · Practice › Administration · 15 Feb 2026 · 14 likes The arithmetic in post #19 is right; the assumption feeding it is the part to check. Needle length matters less than angle for subcutaneous delivery in most people. A…
Pre-registering a personal experiment, seriously — a second dataset Replied, post #29 · Research Methods › N-of-1 designs · 7 Feb 2026 · 0 likes Thank you for taking the time. That was more work than a reply usually is.
Storing lyophilised material long term: what governs the shelf life Replied, post #45 · Practice › Storage & stability · 30 Jan 2026 · 4 likes Visible particulate is a strong signal in the other direction: it is a reason to stop and ask rather than to filter and proceed. Two sources, same conclusion, and I…
Aggregates and why a purity assay may miss them entirely Replied, post #57 · Analytics › Impurities & related substances · 7 Jan 2026 · 0 likes Residual solvents: traces of solvents used in purification. These are usually tested by gas chromatography, not by HPLC. A specification for residual solvents should be…
Second pass at: What "verified" means on our vendor pages, stated narrowly Replied, post #48 · Sourcing › Vendor reports · 21 Dec 2025 · 22 likes Sensible. I would want the same detail before I acted on it either.
Personal import allowances, compared Replied, post #3 · Access › International · 18 Dec 2025 · 11 likes What I would check first on personal import allowances is whether the thing being measured moved or whether the way of measuring it moved. Those look identical in a…
The decimal-point error, and the habit that catches it Replied, post #97 · Practice › Reconstitution · 17 Dec 2025 · 28 likes Preservative effectiveness is tested against a defined microbial challenge under defined conditions. It is not a licence to treat an entered vial as sterile…
Reconstitution volumes that produce round numbers, tabulated Replied, post #9 · Practice › Reconstitution · 16 Dec 2025 · 1 like Noted, and thank you for writing it out rather than summarising it.
Sequence verification for an obscure compound: how it is done — what changed since Replied, post #108 · Compounds › Other compounds · 26 Nov 2025 · 21 likes This follows post #107 rather than contradicting it. Research-use-only status is a legal classification, not a safety classification. It means the compound is sold for…
Sequence verification for an obscure compound: how it is done — what changed since Replied, post #50 · Compounds › Other compounds · 24 Nov 2025 · 27 likes Having read the whole Sequence verification thread before replying: the question in the first post has not actually been answered yet, and three of us have answered a…
Second pass at: Robustness: the parameters worth deliberately varying Replied, post #22 · Analytics › Method validation · 28 Oct 2025 · 18 likes Worth separating two things that post #18 runs together. What I would check first on Robustness is whether the thing being measured moved or whether the way of…
New subcategory: rationale and scope Replied, post #134 · Meta › Announcements · 27 Oct 2025 · 6 likes The version of new subcategory that I was taught turned out to be a teaching simplification. Useful, and not true in the way I had assumed it was.
What happens after your first post: likes, trust levels, and why none of it matters much… Replied, post #110 · Start Here › Welcome · 22 Oct 2025 · 11 likes If you are not sure which subcategory a question belongs in, post it in the closest one. A moderator will move it, the move is logged, and nothing bad happens to you.…
Payment mechanics and the recovery options that do not exist Replied, post #68 · Sourcing › Payments · 22 Oct 2025 · 0 likes Picking up post #65: that is the part I would want checked first. What I can speak to on payment mechanics is narrow, so I will keep it narrow rather than generalising…
Older adults, sarcopenia risk, and the trade-off nobody quantifies — the long version Replied, post #28 · Clinical › Special populations · 28 Sep 2025 · 0 likes Two people in this thread mean different things by Older adults and are disagreeing about the definition while believing they are disagreeing about the facts. Worth…
Persistent vomiting and the threshold for seeking help Replied, post #38 · Safety › Adverse events · 22 Sep 2025 · 2 likes Pancreatitis is a genuine serious adverse event to know: severe epigastric pain, back pain, elevated lipase (≥3× upper limit of normal). If this constellation appears,…
Journal club: STEP-HFpEF and symptom endpoints Replied, post #15 · Evidence › Journal club · 5 Sep 2025 · 2 likes Adding the measurement that post #12 says would settle it. The reason step-hfpef and symptom endpoints is hard to answer is that the obvious measurement and the…
A calculator that gives a right answer to the wrong question — does this still hold? Replied, post #9 · Data & Tools › Calculators · 2 Sep 2025 · 31 likes Reporting bugs: if you notice a calculator giving wrong results, report it in this subcategory. Bugs are fixed when identified.
Tracking that stops updating and then resumes Replied, post #22 · Sourcing › Logistics · 30 Aug 2025 · 4 likes I read post #18 twice before replying, because I had assumed the opposite. Import restrictions by jurisdiction: what is legal to import for personal use varies…
Insurance and replacement policies, compared — the long version Replied, post #7 · Sourcing › Logistics · 19 Aug 2025 · 5 likes Quietly grateful for the plain phrasing. Not every thread gets that.
Asking about a compound your prescriber has not heard of Replied, post #130 · Clinical › Prescriber conversations · 18 Aug 2025 · 3 likes I read post #128 twice before replying, because I had assumed the opposite. Asking about the plan if the first approach does not work is a good use of an appointment…
Escalating every six weeks instead of four: what I observed over eight months — one year… Replied, post #49 · Practice › Dosing & titration · 13 Aug 2025 · 24 likes Dose equivalence between different incretin analogues is a weak concept. The molecules differ in structure, half-life, receptor selectivity, and in what has been…
Coming back to: Semaglutide half-life: where the 165 to 184 hour figure comes from Replied, post #95 · Compounds › Semaglutide · 31 Jul 2025 · 0 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…
How to research a compound with no human data without deceiving yourself Replied, post #23 · Compounds › Other compounds · 31 Jul 2025 · 10 likes AOD-9604 is a fragment of human growth hormone and has been discussed as a potential weight-loss agent based on theoretical mechanism. The fragment hypothesis — that…
TB-500 and thymosin beta-4: the fragment versus the protein Replied, post #65 · Compounds › Repair & healing peptides · 11 Jul 2025 · 4 likes On post #61 — agreed on the reasoning, with one qualification. Counterpoint on TB-500 and thymosin beta-4, offered without confidence: the same observation is…
Revisiting: Why a compound being unapproved is not the same as being illegal to possess Replied, post #45 · Sourcing › Regulatory · 9 Jul 2025 · 22 likes I would be cautious about generalising from the compound being unapproved example above. It is a good example. It is one example.
Revisiting: GLP-1 receptor distribution: central and peripheral Replied, post #10 · Pharmacology › Receptor biology · 26 Jun 2025 · 14 likes Narrowing post #7, because the general version has more than one answer. Pharmacological class effects: all GLP-1 agonists slow gastric emptying and suppress appetite.…
The CagriSema phase 2 paper and what a fixed combination buys — the long version Replied, post #70 · Compounds › Cagrilintide & amylin analogues · 11 Jun 2025 · 3 likes The arithmetic in post #68 is right; the assumption feeding it is the part to check. Is synergy the right word for the combination data? A phase 2 trial cannot…
[2026 update] An appeal that failed, and what I would do differently Started this topic · Access › Insurance & coverage · 5 Jun 2025 · 14 likes Posting this under the heading it deserves: An appeal that failed, and what I would do differently Everything below is what sits behind that. Asking about appeal…
System suitability injections: if they failed, the run did not happen Replied, post #5 · Analytics › HPLC & UHPLC · 4 Jun 2025 · 8 likes Taking post #4 at face value and following it one step further. Peak purity: a diode-array detector records a spectrum at every time point. If a peak contains two…
Pre-registering a personal experiment, seriously Replied, post #44 · Research Methods › N-of-1 designs · 29 May 2025 · 0 likes Measure the same thing the same way at the same time of day. Most of the noise in personal data is measurement protocol rather than biology.
Coming back to: Getting a referral rather than a refusal Replied, post #8 · marked as the solution · Clinical › Prescriber conversations · 27 May 2025 · 33 likes On post #7 — agreed on the reasoning, with one qualification. The most useful thing anyone has posted about Getting a referral in this category was a table of what had…
Forced degradation studies: designing one that is informative — does this still hold? Replied, post #3 · marked as the solution · Analytics › Method validation · 24 May 2025 · 11 likes The confident answers on Forced degradation studies and the well-sourced answers are not the same answers, which is the most useful thing I have learned reading this…
Adjudicated events and why the definition matters — the long version Replied, post #132 · Evidence › Trials · 3 May 2025 · 0 likes A note on how Adjudicated events gets discussed rather than on Adjudicated events itself: the confident posts get the replies and the careful ones get ignored, and the…
Journal club: STEP 1 and the treatment-policy estimand — does this still hold? Replied, post #56 · Evidence › Journal club · 19 Apr 2025 · 4 likes STEP 1 has been discussed here with more heat than it deserves, mostly because two definitions have been in play the whole time.
Why fasting instructions for oral semaglutide are not optional advice — does this still… Replied, post #15 · Compounds › Oral incretins · 7 Apr 2025 · 18 likes The absorption enhancer in the licensed oral product works by transiently raising local gastric pH and promoting absorption across the mucosa. It is the reason the…
Coming back to: Sample size calculations, read backwards from the published number Replied, post #7 · Evidence › Trials · 30 Mar 2025 · 0 likes What I would want before treating Sample size calculations as settled: the method, the sample, and whether anyone tried to find the opposite result. Two of the three…
A supplier that answers analytical questions with restated claims Replied, post #47 · Sourcing › Red flags · 28 Mar 2025 · 5 likes Inconsistency across documents: a certificate stating one purity, a website claiming another, and a supplier's verbal representation claiming a third, all on the same…
Telehealth prescribing models in the US Replied, post #74 · Regional › North America · 22 Mar 2025 · 0 likes This is the first time the answer has come with its own limits attached. Appreciated.
Pharmaceutical compounding rules, summarised from primary sources Replied, post #163 · Sourcing › Regulatory · 6 Mar 2025 · 0 likes Building on post #160 rather than restating it. Pharmaceutical compounding rules came up in a thread eighteen months ago and was answered well. I cannot find it, which…
Counter-ion form: the field almost nobody reports — one year on Replied, post #26 · Analytics › COA interpretation · 25 Feb 2025 · 5 likes Following, with nothing to contribute beyond having asked the same thing elsewhere.
Review: a draft on reconstitution arithmetic, with objections Replied, post #34 · Documentation › Doc review · 24 Feb 2025 · 0 likes Reviewing your own nomination is fine and is not sufficient. Somebody else has to read it for the process to mean anything. That has held every time I have looked,…
Fixed versus detachable needles: the trade-offs Replied, post #114 · Devices › Syringes & needles · 15 Jan 2025 · 16 likes Thank you for the correction. I would rather find out here than later.
Research-use-only labelling: what it means and what it does not — the long version Replied, post #46 · Sourcing › Regulatory · 18 Dec 2024 · 0 likes For anyone finding this later: the short answer on Research-use-only labelling is that it depends on one thing, and the rest of the thread is people identifying which…
Revisiting: Moderation log format change Replied, post #69 · Meta › Announcements · 15 Dec 2024 · 1 like Reporting rather than recommending, on Moderation log format change. What happened is above. Whether it should have is a different question and not one I am qualified…
How to ask for a dose change without antagonising anyone — what changed since Replied, post #50 · Clinical › Prescriber conversations · 11 Nov 2024 · 19 likes Answering the question post #46 raises rather than the one it answers. Prescription logistics: confirm whether it will be filled locally, requires mail order, or will…
Revisiting: How to bring a laboratory report to an appointment usefully Replied, post #72 · Clinical › Bloodwork · 1 Oct 2024 · 2 likes The bit of bring a laboratory that nobody enjoys is that the answer changes depending on what you are trying to decide with it. Say what the decision is and the thread…
What a stability-indicating method is and how you demonstrate one — one year on Replied, post #24 · Analytics › Method validation · 30 Aug 2024 · 19 likes Picking up post #21: that is the part I would want checked first. A method that reports the same number for every lot is worth a second look. Real processes vary, and a…
[2026 update] People with a low starting BMI: where the evidence stops Replied, post #7 · Clinical › Special populations · 29 Aug 2024 · 2 likes On post #5 — agreed on the reasoning, with one qualification. Dedicated trials in under-studied populations are the only real remedy and several are ongoing, which is…
Correlation in a self-tracked dataset: what it can support Replied, post #165 · Research Methods › Statistics · 26 Aug 2024 · 29 likes On correlation, 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.