Nardone

TL2 Member · Dijon, FR

Practical questions, practical answers. Not interested in speculation without a source.

Joined 10 December 2024 · last posted 8d

85 posts, newest first. Showing up to 150.

Second pass at: When your prescriber and the evidence disagree Replied, post #53 · Clinical › Prescriber conversations · 20 Jul 2026 · 30 likes Adding the measurement that post #52 says would settle it. Where the prescriber reasoning breaks down for me is the step from the group result to the individual case.…
An 18-month record including the parts that went badly Replied, post #74 · Outcomes › Progress reports · 19 Jul 2026 · 0 likes Self-reported intake is optimistic in a consistent direction, and saying so in your own report is more credible than not. That is what the documentation says. What…
Revisiting: Hepatic effects of glucagon receptor agonism: the mechanistic worry Replied, post #6 · Compounds › Retatrutide · 17 Jul 2026 · 21 likes Building on post #5 rather than restating it. Hepatic effects: glucagon receptor agonism promotes hepatic fat oxidation, which is mechanistically plausible for benefit…
Washout with a one-week half-life: the arithmetic — does this still hold? Replied, post #41 · Research Methods › N-of-1 designs · 15 Jul 2026 · 0 likes Post #40 is right about the mechanism and I think understates the practical bit. Washout is well covered in the tag pages, and the older discussions are better than the…
Specificity, linearity, accuracy, precision, range, robustness — with real criteria Replied, post #42 · Analytics › Method validation · 12 Jul 2026 · 10 likes That is clearer than the version I had in my head. Thank you.
Private prescribing in the UK: what is actually involved Replied, post #61 · Regional › UK & Ireland · 10 Jul 2026 · 5 likes Building on post #60 rather than restating it. Agreed on private prescribing, with one qualification that I think matters. The reasoning holds for the case as…
[2026 update] Detection wavelength and why 214 nm and 280 nm disagree Replied, post #17 · Analytics › HPLC & UHPLC · 7 Jul 2026 · 0 likes Worth stating the null on Detection wavelength before we explain it: the observation may be nothing. That possibility deserves a sentence and usually does not get one.
Designing a personal experiment that could change your mind — one year on Replied, post #71 · Research Methods › N-of-1 designs · 6 Jul 2026 · 1 like Answering the Designing a personal experiment question as asked, then the question I think is meant. As asked: yes, with the qualification below. As meant: it depends…
What a simple presence test is genuinely useful for Replied, post #2 · Analytics › Home & field testing · 5 Jul 2026 · 3 likes False positives and false negatives: no test has 100% sensitivity and 100% specificity. A negative result does not guarantee absence; a positive result does not…
How much context is too much context in a first post? Replied, post #16 · Start Here › How to Ask · 5 Jul 2026 · 8 likes Number your questions if there is more than one. It sounds fussy. It means the answer can be numbered back, and you find out which one nobody addressed.
Follow-up: Reading an interaction checker output critically Replied, post #31 · Practice › Interactions · 4 Jul 2026 · 0 likes Seconded. It reads as careful rather than confident, which is the right register.
Review: a draft on reconstitution arithmetic, with objections — one year on Replied, post #38 · Documentation › Doc review · 3 Jul 2026 · 0 likes A methods point on draft on reconstitution arithmetic rather than a substantive one: if the comparison is not like for like, the difference you are measuring is the…
Second pass at: Absence of evidence and evidence of absence Replied, post #33 · Research Methods › Statistics · 29 Jun 2026 · 25 likes On post #29 — agreed on the reasoning, with one qualification. Filing a mild objection to the consensus on Absence of evidence. Mild because I might be wrong; an…
Aggregate verification data across the directory, with caveats Replied, post #17 · Sourcing › Independent verification · 28 Jun 2026 · 17 likes Verification is about documents and measurements. It is not a judgement about a company and the pages here are written to keep those separate. The variance between…
NHS criteria and how they are applied in practice Replied, post #11 · Regional › UK & Ireland · 25 Jun 2026 · 32 likes Adding the measurement that post #8 says would settle it. Where a service has its own criteria layered on top of national guidance, those are the criteria that decide…
What a reversed-phase purity number actually is Started this topic · Analytics › HPLC & UHPLC · 23 Jun 2026 · 21 likes The question in the title: What a reversed-phase purity number actually is I will give what I have already checked below so nobody repeats it. I would like to…
Batch numbers that do not match the vial label — what changed since Replied, post #35 · Sourcing › Red flags · 12 Jun 2026 · 1 like I had read the opposite somewhere and cannot now find where, which tells me something.
Micronutrient adequacy at low total intake Replied, post #61 · Nutrition & Training › Protein & intake · 11 Jun 2026 · 1 like Temperature and texture change what is tolerable for a lot of people during the first weeks, and that is worth experimenting with before concluding nothing works.…
Endotoxin and why it is a separate question from purity — what changed since Replied, post #42 · Analytics › Impurities & related substances · 10 Jun 2026 · 1 like Dimer and higher-order multimers: two or more peptide molecules bonded together. They appear at double the mass and higher. They may or may not separate from the…
Why the cheapest option is often not the cheapest Replied, post #8 · Access › Pricing · 9 Jun 2026 · 6 likes Cheapest option: I would want to see the raw numbers rather than the summary before agreeing. Summaries lose exactly the information that would settle this.
Prescription portability between countries Replied, post #58 · Access › International · 9 Jun 2026 · 13 likes Reciprocal recognition between regulators exists in some regions and not others, and assuming it is how people end up surprised. This is the sort of thing that ought to…
Request: a per-category review queue Replied, post #25 · Meta › Feature requests · 8 Jun 2026 · 0 likes Modest request: remember my sort preference per category rather than globally. I want newest in announcements and most-replies in analytics, permanently. I would put a…
The anatomy of a question that gets answered within an hour Replied, post #68 · Start Here › How to Ask · 5 Jun 2026 · 30 likes Post #67 answers the question as asked. The question underneath it is different. "Has anyone had this happen" gets you anecdotes. "What would cause this, and what would…
Peak-to-trough ratio at steady state for a weekly agent Replied, post #37 · Pharmacology › Pharmacokinetics · 2 Jun 2026 · 0 likes A note on how peak-to-trough ratio gets discussed rather than on peak-to-trough ratio itself: the confident posts get the replies and the careful ones get ignored, and…
Ultrasound and skinfolds: operator dependence in practice Replied, post #3 · Outcomes › Body composition · 31 May 2026 · 0 likes Ultrasound and skinfolds is worth one more sentence than it usually gets, and the sentence is the one about how the number was arrived at.
What to include when your question involves a chromatogram — one year on Replied, post #4 · Start Here › How to Ask · 12 May 2026 · 21 likes Nobody minds being asked to explain a term. The people who use them most are the quickest to define them, and a question that stops to ask is usually a question that…
Subgroup analyses: pre-specified versus discovered — a second dataset Replied, post #77 · Evidence › Trials · 7 May 2026 · 30 likes On post #74 — agreed on the reasoning, with one qualification. A definition problem is doing most of the work in this Subgroup analyses discussion. Once the term is…
Tracking intake honestly when appetite is absent Replied, post #13 · Nutrition & Training › Protein & intake · 1 May 2026 · 12 likes Fibre and fluid tend to fall alongside protein when intake drops, and the constipation reported here follows from that as much as from the mechanism.
Sample size intuition for a personal experiment — does this still hold? Replied, post #18 · Research Methods › Statistics · 25 Apr 2026 · 3 likes Reading this Sample size intuition thread as someone who came in with a fixed view: the third and seventh replies moved me and the confident ones did not.
Journal club: orforglipron phase 2 and the non-peptide question Replied, post #42 · Evidence › Journal club · 19 Apr 2026 · 5 likes Building on post #39 rather than restating it. Checked the orforglipron phase 2 claim against the primary source this morning. It survives, with a narrower scope than…
Fasting versus non-fasting and which tests care Replied, post #13 · Clinical › Bloodwork · 16 Apr 2026 · 0 likes Taking post #11 at face value and following it one step further. A definition problem is doing most of the work in this fasting versus non-fasting discussion. Once the…
List price versus negotiated price versus what you pay Replied, post #75 · Access › Pricing · 14 Apr 2026 · 11 likes Larger orders shift risk as well as price, because more of your material then comes from one lot. That is where I would start, not where I would stop.
Revisiting: Drawing up with one needle and injecting with another Replied, post #78 · Practice › Administration · 8 Apr 2026 · 26 likes Answering the question post #75 raises rather than the one it answers. Pinch or no pinch: the decision depends on needle length and on your own anatomy. A longer needle…
Clearance pathways and what renal impairment changes Replied, post #12 · Pharmacology › Pharmacokinetics · 6 Apr 2026 · 0 likes Coming back to post #8, because the follow-up matters more than the original answer. Where two sources give different half-lives, check the study design before deciding…
Second pass at: Which categories are strict and which are relaxed, honestly Replied, post #36 · Start Here › Welcome · 6 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…
Why retatrutide discussion here is more cautious than elsewhere Replied, post #5 · Compounds › Retatrutide · 5 Apr 2026 · 6 likes On retatrutide discussion I would separate what is worth knowing from what is worth acting on. The first list is long and the second is short, and conflating them is…
Grapefruit: why this class is not the class that cares Replied, post #120 · Practice › Interactions · 4 Apr 2026 · 0 likes Grapefruit has a well-known answer and a correct answer, and the interesting work is establishing that they are the same. Nobody has done that here yet.
Bug report: the reconstitution calculator and a rounding edge case Replied, post #10 · Data & Tools › Calculators · 1 Apr 2026 · 0 likes Precision and significant figures: the calculators do not round to match your input precision. If you input values to one decimal place, the output might have more. Use…
Measurement error in home scales, with a worked standard deviation Replied, post #32 · Research Methods › Statistics · 26 Mar 2026 · 32 likes Relative risk and odds ratios: both compare the rate in one group to the rate in another. Relative risk is easier to understand. Odds ratios are standard in many…
Common supplements people ask about, assessed one at a time — a second dataset Replied, post #67 · Practice › Interactions · 13 Mar 2026 · 19 likes Oral contraceptive absorption has been studied specifically for some compounds in this class and the findings are compound-specific. Generalising from one to another is…
Nausea profile of amylin analogues compared with GLP-1 agonists Replied, post #23 · Compounds › Cagrilintide & amylin analogues · 23 Feb 2026 · 1 like I had written a reply contradicting post #21 and deleted it. Here is what survived. On analysis: an amylin analogue and its aggregates are not equally detectable by a…
Angle of injection and whether 90 degrees is always right Replied, post #98 · Practice › Administration · 11 Feb 2026 · 2 likes The arithmetic in post #95 is right; the assumption feeding it is the part to check. Pinching a fold is useful for lean tissue and unnecessary elsewhere. The point is…
Storing lyophilised material long term: what governs the shelf life Replied, post #44 · Practice › Storage & stability · 29 Jan 2026 · 0 likes I would call the community position on storing lyophilised material long term likely rather than established, and I would be comfortable defending that hedge.
Research-use-only labelling: what it means and what it does not Replied, post #89 · Sourcing › Regulatory · 18 Jan 2026 · 25 likes Post #88 answers the question as asked. The question underneath it is different. Off-label use and medical practice: clinicians can prescribe approved medications…
Adducts: sodium, potassium, and the peak you did not expect — does this still hold? Replied, post #6 · Analytics › Mass spectrometry · 11 Jan 2026 · 2 likes Adducts — sodium and potassium especially — shift the observed mass in predictable increments. A report showing an unexplained plus twenty-two is usually showing you a…
Coming back to: Private prescribing in the UK: what is actually involved Replied, post #33 · Regional › UK & Ireland · 3 Jan 2026 · 1 like 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…
Vomiting: when it is expected and when it is a reason to stop Replied, post #100 · Practice › Side effects · 29 Dec 2025 · 0 likes Fine by me. I had wanted a stronger conclusion and there is not one available.
The decimal-point error, and the habit that catches it Replied, post #92 · Practice › Reconstitution · 17 Dec 2025 · 5 likes Post #89 and I disagree about the size of the effect, not about the direction. Preservative effectiveness is tested against a defined microbial challenge under defined…
Personal import allowances, compared Replied, post #2 · Access › International · 17 Dec 2025 · 3 likes A definition problem is doing most of the work in this personal import allowances discussion. Once the term is pinned down I suspect the disagreement mostly goes away…
Robustness: the parameters worth deliberately varying Replied, post #37 · Analytics › Method validation · 3 Dec 2025 · 0 likes Precision has two levels worth distinguishing: repeatability within a run and intermediate precision across days, analysts and instruments. The second is where most…
Second pass at: What "verified" means on our vendor pages, stated narrowly Replied, post #41 · Sourcing › Vendor reports · 2 Dec 2025 · 3 likes Reports of ordinary results are more valuable than reports of remarkable ones, precisely because only the remarkable ones get posted elsewhere. The claim is narrower…
A history of disordered eating: proceeding carefully Replied, post #17 · Wellbeing › Mental health · 1 Dec 2025 · 3 likes Mood and anxiety: mood changes and anxiety are reported by some people. Baseline mental health status matters for risk. Someone with a history of depression should plan…
New subcategory: rationale and scope Replied, post #137 · Meta › Announcements · 27 Oct 2025 · 3 likes I have been on both sides of the new subcategory argument in this category within eighteen months, which should tell you how strong the evidence for either side is.
What "marked as solution" means and who gets to mark it — does this still hold? Replied, post #6 · Start Here › Welcome · 25 Oct 2025 · 0 likes Sensible. I would want the same detail before I acted on it either.
Payment mechanics and the recovery options that do not exist Replied, post #61 · Sourcing › Payments · 21 Oct 2025 · 10 likes That is consistent with mine, for whatever one more account is worth.
Citing a preprint in a maintained document: our rule and its reasoning — does this still… Replied, post #92 · Evidence › Preprints · 2 Oct 2025 · 7 likes Do not build anything on a preprint that you would mind rebuilding: if the preprint later changes substantially in revision or shows different results when published,…
Reading SURMOUNT-1 without the press release — one year on Replied, post #10 · Compounds › Tirzepatide · 24 Sep 2025 · 10 likes Confirming post #7 from a second method, which matters more than confirming it from a second person. Categorical response thresholds — the proportion reaching ten,…
Older adults, sarcopenia risk, and the trade-off nobody quantifies — the long version Replied, post #25 · Clinical › Special populations · 22 Sep 2025 · 26 likes I had written a reply contradicting post #23 and deleted it. Here is what survived. Adolescents: a distinct evidence base exists. The compounds are not approved for…
Persistent vomiting and the threshold for seeking help Replied, post #35 · Safety › Adverse events · 17 Sep 2025 · 0 likes Taking persistent vomiting seriously for a moment rather than deflecting: the honest position is that the community has observations and no controlled comparison, and…
What a documentation review can and cannot tell you Replied, post #44 · Sourcing › Independent verification · 22 Jul 2025 · 6 likes Post #42 and I disagree about the size of the effect, not about the direction. I have been on both sides of the documentation review argument in this category within…
Trial registration and comparing the protocol with the paper Replied, post #23 · Evidence › Trials · 20 Jul 2025 · 15 likes Generalisability: the enrolled population was selected in ways that matter. Entry criteria, run-in periods, and the simple fact that people who agree to a multi-year…
A 5 mg vial and a 0.25 mg dose: the arithmetic in full — the long version Replied, post #166 · Practice › Reconstitution · 16 Jul 2025 · 1 like Taking post #165 at face value and following it one step further. A 10 mg vial reconstituted three different ways: 1 mL diluent gives 10 mg/mL, 2 mL gives 5 mg/mL, 4 mL…
Adolescents: a distinct evidence base — one year on Started this topic · Clinical › Special populations · 1 Jul 2025 · 35 likes Posting this under the heading it deserves: Adolescents: a distinct evidence base — one year on Everything below is what sits behind that. A methods question rather…
System suitability injections: if they failed, the run did not happen Replied, post #8 · Analytics › HPLC & UHPLC · 18 Jun 2025 · 2 likes Two sentences on system suitability injections and then I will stop, because the rest is speculation and the thread is better without mine. What is documented is…
Asking about a compound your prescriber has not heard of Replied, post #58 · Clinical › Prescriber conversations · 6 Jun 2025 · 19 likes Post #56 put the caveat in the right place and I want to underline it. Bringing a record of symptoms with dates and severities makes an assessment materially easier and…
Pre-registering a personal experiment, seriously Replied, post #45 · Research Methods › N-of-1 designs · 29 May 2025 · 10 likes Sample size in n-of-1: you are the sample. Repeated measurements (weekly weighings, daily mood scores) increase the power to detect a real effect even though n=1. Worth…
Coming back to: Getting a referral rather than a refusal Replied, post #3 · Clinical › Prescriber conversations · 25 May 2025 · 11 likes Two claims get bundled together under Getting a referral and they need separating. The descriptive one — this is what was observed — is usually well supported. The…
Second pass at: Retatrutide mass and identity: what a report should show Replied, post #51 · Compounds › Retatrutide · 24 May 2025 · 9 likes Sensible. I would want the same detail before I acted on it either.
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly Replied, post #79 · Compounds › Tirzepatide · 8 May 2025 · 18 likes Taking post #78 at face value and following it one step further. For anyone finding this later: the short answer on tirzepatide in type 2 diabetes is that it depends on…
Adjudicated events and why the definition matters — the long version Replied, post #133 · Evidence › Trials · 3 May 2025 · 19 likes Multiplicity and multiple comparisons: if a trial tests many hypotheses, the chance of a false positive on at least one by random chance increases. This is why…
Review: a draft on reconstitution arithmetic, with objections Replied, post #119 · Documentation › Doc review · 22 Apr 2025 · 0 likes Grateful for the specificity. Vague answers to this question are what sent me looking.
Journal club: STEP 1 and the treatment-policy estimand — does this still hold? Replied, post #57 · Evidence › Journal club · 19 Apr 2025 · 0 likes I read post #55 twice before replying, because I had assumed the opposite. A note on scope: what I am saying about STEP 1 applies to the case in the first post and I…
Why fasting instructions for oral semaglutide are not optional advice — does this still… Replied, post #20 · Compounds › Oral incretins · 19 Apr 2025 · 24 likes Post #19 answers the question as asked. The question underneath it is different. Trial adherence in an oral trial with strict administration requirements is genuinely…
Coming back to: Sample size calculations, read backwards from the published number Replied, post #6 · Evidence › Trials · 27 Mar 2025 · 26 likes I read post #4 twice before replying, because I had assumed the opposite. Absolute numbers, not just relative: a 30% relative reduction tells you the ratio but not the…
Validating a method you did not develop — does this still hold? Replied, post #89 · Analytics › Method validation · 8 Mar 2025 · 0 likes Robustness testing deliberately varies the parameters most likely to drift — organic percentage, pH, temperature, flow — and shows the result does not. It is the part…
Biased agonism: a real phenomenon, an over-used explanation Replied, post #52 · Pharmacology › Receptor biology · 6 Mar 2025 · 28 likes An honest declaration on biased agonism: I have a prior here and it is strong enough that you should weight what I say downward. Stating it rather than hiding it.
Counter-ion form: the field almost nobody reports — one year on Replied, post #21 · Analytics › COA interpretation · 23 Feb 2025 · 2 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…
Revisiting: What a well-designed human trial of a secretagogue would look like Replied, post #43 · Compounds › Secretagogues & GH axis · 21 Jan 2025 · 6 likes The pulsatile character of endogenous growth hormone release is why a secretagogue and exogenous growth hormone are not interchangeable, and why a single measured level…
Fixed versus detachable needles: the trade-offs Replied, post #117 · Devices › Syringes & needles · 16 Jan 2025 · 10 likes This follows post #116 rather than contradicting it. Fixed versus detachable needles has been discussed here with more heat than it deserves, mostly because two…
Criticising the method without criticising the authors Replied, post #29 · Evidence › Study critique · 5 Jan 2025 · 0 likes A critique should end with what would change your mind. Without that it is a position rather than an argument. I would want to see it done twice before believing it once.
A certificate whose chromatogram axes do not match its stated method Started this topic · Sourcing › Red flags · 5 Dec 2024 · 12 likes Posting this under the heading it deserves: A certificate whose chromatogram axes do not match its stated method Everything below is what sits behind that. A narrow…
Food noise reducing and the disorientation that can follow Replied, post #43 · Wellbeing › Mental health · 18 Nov 2024 · 26 likes This follows post #42 rather than contradicting it. Expectations set by other people's reported trajectories are a documented source of distress, and the trajectories…
About the International category Replied, post #5 · Access › International · 8 Oct 2024 · 22 likes Travel with medication: carrying a compound across borders is complicated by legal status. Documenting that it is prescribed and carrying proof reduces (but does not…
High-resolution MS on aggregates and what it can see — one year on Replied, post #50 · Analytics › Mass spectrometry · 20 Aug 2024 · 6 likes Calibration matters: a high-resolution instrument out of calibration can report mass with ppm error large enough to be uninformative. Check when the instrument was last…
Second pass at: Journal club: LEADER as the historical anchor Replied, post #71 · Evidence › Journal club · 27 Jul 2024 · 5 likes Small correction to my own earlier position on LEADER. I had the units the wrong way round, which changes the conclusion by an order of magnitude and therefore changes…