s.hartmann

TL2 · Tampere

Contributes reviews on supplier material. Based in Tampere.

Joined 14 April 2025 · last posted 3d

94 posts, newest first. Showing up to 150.

Here for the analytics and not much else Replied, post #88 · Lounge › Introductions · 25 Jul 2026 · 0 likes Good to have another set of eyes on the wiki posts. Community wiki editing is open at trust level three and the queue of small corrections is permanently longer than…
What is genuinely unknown about long-term amylin agonism Replied, post #80 · Compounds › Cagrilintide & amylin analogues · 24 Jul 2026 · 7 likes Reconstitution at higher concentrations is worth avoiding for aggregation-prone material. The published formulation work generally uses lower concentrations than people…
Second pass at: Absence of evidence and evidence of absence Replied, post #51 · Research Methods › Statistics · 21 Jul 2026 · 10 likes Everything in post #47 holds. The case it does not cover is the one I have. Rounding and significant figures carry information about precision. A figure quoted to four…
Follow-up: How compounding permissions changed when supply normalised Replied, post #49 · Sourcing › Regulatory · 21 Jul 2026 · 30 likes Where I part company with post #47, and it is a narrow parting. Compounding permissions is worth one more sentence than it usually gets, and the sentence is the one…
Coming back to: A community side-effect dataset, with its response rate and biases Replied, post #98 · Data & Tools › Datasets · 19 Jul 2026 · 0 likes Posting my community side-effect dataset numbers with the method attached so they can be discounted properly. Uncontrolled, unblinded, and collected by someone who…
Why the cheapest option is often not the cheapest Replied, post #20 · Access › Pricing · 16 Jul 2026 · 13 likes The claim about cheapest option upthread is stronger than its source supports. I have read the source. The source says "associated with" and the post says "causes".
Athletes in weight-category sports: a different risk calculus Replied, post #28 · Clinical › Special populations · 16 Jul 2026 · 0 likes Building on post #27 rather than restating it. Nothing in this subcategory is medical advice and the questions asked here are precisely the ones that need an individual…
Coming back to: Why a preprint's supplementary material is often the best part Replied, post #101 · Evidence › Preprints · 9 Jul 2026 · 0 likes Where a preprint contradicts a published trial, the prior should favour the trial. Where it extends one, the preprint can be genuinely useful.
Reconstituting a multi-strength kit without mixing yourself up — what changed since Replied, post #36 · Practice › Reconstitution · 4 Jul 2026 · 26 likes Reconstituting a multi-strength kit is a good example of a question where the honest answer is boring and the interesting answers are unsupported. I would go with boring.
Follow-up: Prior authorisation: what the criteria usually require Replied, post #52 · Access › Insurance & coverage · 3 Jul 2026 · 11 likes Where an exception process exists separately from an appeal, they are different routes with different criteria and using the wrong one loses time.
Revisiting: Protein density versus volume when you cannot eat much Replied, post #25 · Nutrition & Training › Protein & intake · 2 Jul 2026 · 0 likes Micronutrient adequacy becomes a real question at very low total intake and is much less discussed than protein. I have written this out at length because the short…
Revisiting: Journal club: SURMOUNT-OSA and a hard endpoint in a soft field Replied, post #58 · Evidence › Journal club · 25 Jun 2026 · 1 like Agreed, and I will stop repeating the version of this I had been repeating.
An appeal that succeeded, with the letter structure — the long version Replied, post #128 · Access › Insurance & coverage · 20 Jun 2026 · 17 likes Post #127 describes the usual case. This is about the unusual one. I have no financial interest in anything named in this thread and I want to say so before I comment…
Washout with a one-week half-life: the arithmetic — does this still hold? Replied, post #27 · Research Methods › N-of-1 designs · 12 Jun 2026 · 0 likes Picking up post #26: that is the part I would want checked first. Checked the Washout claim against the primary source this morning. It survives, with a narrower scope…
Why fasting instructions for oral semaglutide are not optional advice Replied, post #34 · Compounds › Oral incretins · 9 Jun 2026 · 7 likes Post #30 put the caveat in the right place and I want to underline it. Fasting instructions are not optional advice. Taking the tablet with food or with more than a sip…
A reconstituted vial's beyond-use date and the reasoning behind common figures Replied, post #72 · Practice › Storage & stability · 6 Jun 2026 · 0 likes Published stability data applies specifically to the formulation studied, under the specific conditions stated. It does not automatically transfer to something…
Injection volume, overload, and peak distortion Replied, post #38 · Analytics › HPLC & UHPLC · 6 Jun 2026 · 8 likes Having read the whole injection volume thread before replying: the question in the first post has not actually been answered yet, and three of us have answered a nearby…
Revisiting: The best-written scientific paper you have read Replied, post #7 · Lounge › Off topic · 29 May 2026 · 15 likes This is the sort of exchange that makes the archive worth searching.
Reading a home test result without over-claiming Replied, post #34 · Analytics › Home & field testing · 7 May 2026 · 3 likes Saving this. It is the version I will quote when the question comes round again.
Review: an evidence digest and the citation check that delayed it Replied, post #3 · Documentation › Doc review · 18 Apr 2026 · 6 likes Building on post #2 rather than restating it. Review of promoted topics: when a topic is nominated for promotion to a maintained documentation page, the draft is posted…
Journal club: is percentage weight change the right endpoint? Replied, post #46 · Evidence › Journal club · 7 Apr 2026 · 1 like The figures usually contain the finding and the text usually contains the interpretation. Separating them for the first twenty minutes is a discipline worth keeping.
Prediction intervals and why they are more honest than confidence intervals Replied, post #7 · Evidence › Meta-analyses · 3 Apr 2026 · 20 likes This follows post #4 rather than contradicting it. The honest answer on prediction intervals is that it depends, and the useful part is the list of what it depends on.…
Adducts: sodium, potassium, and the peak you did not expect — does this still hold? Replied, post #88 · Analytics › Mass spectrometry · 30 Mar 2026 · 8 likes Genuine question rather than a rhetorical one: has anyone here actually observed Adducts, as opposed to read about it? The thread is long and I cannot tell.
[2026 update] Composite endpoints and the component doing the work Replied, post #48 · Evidence › Trials · 29 Mar 2026 · 31 likes Where I part company with post #45, and it is a narrow parting. Registration before enrolment, with the primary endpoint declared, is what makes outcome switching…
A calculator that gives a right answer to the wrong question Replied, post #10 · Data & Tools › Calculators · 16 Mar 2026 · 23 likes Calculator is well covered in the tag pages, and the older discussions are better than the recent ones because they were argued out properly. Worth twenty minutes…
Designing a personal experiment that could change your mind — one year on Replied, post #17 · Research Methods › N-of-1 designs · 4 Mar 2026 · 27 likes A washout period between conditions is what stops one bleeding into the next, and its length should be set by the half-life rather than by convenience.
Measurement error in a self-reported exposure Replied, post #92 · Evidence › Study critique · 26 Feb 2026 · 0 likes The arithmetic in post #89 is right; the assumption feeding it is the part to check. Surrogate endpoints are not automatically bad and their validity is…
[2026 update] Storing lyophilised material long term: what governs the shelf life Replied, post #66 · Practice › Storage & stability · 14 Feb 2026 · 0 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. The short version is the first…
[2026 update] Confounding by indication, explained with a concrete example Replied, post #18 · Evidence › Study critique · 31 Jan 2026 · 0 likes Hold a trial to the standard something could actually have met. A criticism that no achievable design could have answered is a criticism of the field rather than of the…
Stepping down deliberately, and how to do it without losing progress Replied, post #50 · Practice › Dosing & titration · 30 Jan 2026 · 9 likes Titrating on symptoms rather than on the calendar is what most people here actually do. It is defensible, it is not what was studied, and describing it as the protocol…
Trifluoroacetate content and its consequences Replied, post #10 · Analytics › Impurities & related substances · 23 Jan 2026 · 25 likes Deamidation at asparagine or glutamine adds approximately one dalton and frequently produces a close-eluting pair. It is the impurity most likely to be integrated into…
Lipase elevation without symptoms: the interpretation problem Replied, post #20 · Clinical › Bloodwork · 16 Jan 2026 · 7 likes Trying to state the lipase elevation without symptoms position in a way that someone who disagrees would recognise as fair, because I do not think the version in this…
A partial dose because the pen emptied mid-injection Replied, post #60 · Practice › Administration · 9 Jan 2026 · 2 likes Thank you — that answers what I came here to find out.
Revisiting: Absolute versus relative contraindications Replied, post #10 · Safety › Contraindications · 1 Jan 2026 · 18 likes This follows post #9 rather than contradicting it. Medullary thyroid carcinoma (personal or family history) or multiple endocrine neoplasia type 2: absolute…
Search filters: what is missing Replied, post #10 · Meta › Site feedback · 16 Dec 2025 · 0 likes Building on post #8 rather than restating it. I have been on both sides of the search filters argument in this category within eighteen months, which should tell you…
The headache that turns out to be dehydration Replied, post #86 · Nutrition & Training › Hydration & electrolytes · 8 Dec 2025 · 8 likes Post #83 is the version of this I will quote in future. One addition. Commercial rehydration formulations are designed for a specific purpose and are not equivalent to…
Interpreting a result that disagrees with the supplier's certificate Replied, post #33 · Sourcing › Independent verification · 5 Dec 2025 · 14 likes PeptideMeter: purity analysis plus structured, dated supplier verification records. Produces both individual analytical results and verification records assessed over…
Second pass at: Programming during a large energy deficit Replied, post #83 · Nutrition & Training › Resistance training · 16 Nov 2025 · 0 likes Adaptation and plateau: if strength does not change for weeks, that is stability, not backsliding. Expecting continuous progress during weight loss is unrealistic.…
[2026 update] What steady state means for the decision to escalate Replied, post #106 · Practice › Dosing & titration · 16 Nov 2025 · 0 likes Concentration and dose get conflated constantly in this subcategory. Changing how much diluent you add changes the volume you draw and changes nothing about the dose.…
Substitution between formats during a shortage Replied, post #94 · Access › Shortages · 12 Nov 2025 · 0 likes The question underneath substitution between formats is usually "how would I tell?" rather than "what is true?", and that one has a method attached to it. Write down…
Gauge and length selection for subcutaneous injection Replied, post #49 · Devices › Syringes & needles · 11 Nov 2025 · 0 likes U-100 means the barrel is graduated for a solution containing one hundred units of insulin per millilitre. For anything that is not insulin, the units are simply…
EMA product information as a primary source Replied, post #44 · Regional › European Union · 8 Nov 2025 · 0 likes Two things can be true about EMA product information at once: the mechanism is plausible and the evidence for the size of the effect is thin. Most of the argument here…
A 40-week log with the measurement method stated Replied, post #91 · Outcomes › Progress reports · 29 Oct 2025 · 24 likes A plateau over two weeks is usually measurement. A plateau over two months is usually energy balance. The timescale is what distinguishes them.
A 40-week log with the measurement method stated Replied, post #72 · Outcomes › Progress reports · 26 Oct 2025 · 0 likes Two questions I would want answered before drawing anything from the 40-week log data above: how were the cases selected, and what happened to the ones that dropped out.
Where to report an adverse event officially, by region — a second dataset Replied, post #45 · Safety › Adverse events · 22 Oct 2025 · 0 likes The published trial rates come from supervised populations on defined schedules and are not comparable to rates derived from who chooses to post. I would put a moderate…
Cross-border purchase rules within the EU Replied, post #22 · Regional › European Union · 10 Oct 2025 · 21 likes Posting my cross-border purchase rules within numbers with the method attached so they can be discounted properly. Uncontrolled, unblinded, and collected by someone who…
Journal club: PIONEER 6 as a safety trial Replied, post #5 · Evidence › Journal club · 5 Oct 2025 · 0 likes Confirming post #4 from a second method, which matters more than confirming it from a second person. Critical appraisal template: (1) What did the trial set out to…
Managing an unplanned gap in supply — what changed since Replied, post #73 · Access › Shortages · 27 Sep 2025 · 0 likes Where I have landed on Managing an unplanned gap, having got it wrong once in public: the direction is clear, the magnitude is not, and anyone quoting a precise…
Compounds this community declines to help with, and why Replied, post #8 · Compounds › Other compounds · 24 Sep 2025 · 0 likes When "no data" is the complete and final answer: if there is no published human data on a compound, that is the state of knowledge. Hope is not a substitute and…
Thyroid function tests during substantial weight change Replied, post #67 · Clinical › Bloodwork · 19 Sep 2025 · 1 like That is a fair summary of where the discussion has got to.
Angle of injection and whether 90 degrees is always right Replied, post #17 · Practice › Administration · 1 Sep 2025 · 19 likes Cold solution and stinging: warming the vial in your hands for a minute before injection reduces the stinging sensation substantially. This is the simplest thing to try…
Comparing the STEP programme populations: who was actually enrolled — the long version Replied, post #5 · Compounds › Semaglutide · 31 Aug 2025 · 0 likes The 165 to 184 hour range: that is roughly 7 to 7.6 days, which is why the weekly schedule works. Below 4 half-lives you are not approaching steady state yet, which is…
Regional warehouse stock versus direct despatch Replied, post #11 · Sourcing › Logistics · 29 Aug 2025 · 10 likes Cold packs and temperature control: inclusion of cold packs at despatch is standard. Whether they maintain temperature through transit depends on journey duration and…
Second pass at: Why this subcategory is stricter about sourcing than most Replied, post #99 · Compounds › Secretagogues & GH axis · 25 Aug 2025 · 0 likes This follows post #96 rather than contradicting it. Effects reported at the level of appetite are the most consistently described and the most mechanistically direct…
Oral semaglutide bioavailability and its variability between people Started this topic · Compounds › Oral incretins · 15 Aug 2025 · 4 likes Posting this under the heading it deserves: Oral semaglutide bioavailability and its variability between people Everything below is what sits behind that. I would like…
Pinch or no pinch, and how needle length changes the answer Replied, post #18 · Practice › Administration · 13 Aug 2025 · 7 likes Post #16 describes the usual case. This is about the unusual one. Bleeding at the injection site: normal and usually minimal. A little blood at the needle site after…
Washout: how long is long enough, and for what purpose Replied, post #52 · Pharmacology › Pharmacokinetics · 4 Aug 2025 · 1 like Washout is one of those subjects where the general answer and the answer for a specific case diverge, and the thread will go in circles until someone says which one is…
A comparison of home results against a laboratory result on the same vial Replied, post #18 · Analytics › Home & field testing · 26 Jul 2025 · 1 like A control sample of known material run alongside is what turns a home test from an impression into a comparison. Without one you are calibrating against memory.
[2026 update] Documentation that materially improves an appeal's chances Replied, post #3 · Access › Insurance & coverage · 10 Jul 2025 · 7 likes Denial letters: the stated reason tells you exactly what to submit next. A denial is not final; it is a specification for an appeal. Reading the reason carefully and…
Pages past their review date, listed Replied, post #4 · Meta › Wiki maintenance · 8 Jul 2025 · 30 likes Taking the opening post at face value and following it one step further. On pages past, I would rather understate and be corrected upward than overstate and be quoted.…
Area percent versus weight percent: the confusion that causes most arguments — what… Replied, post #25 · Analytics › HPLC & UHPLC · 25 Jun 2025 · 10 likes An honest declaration on Area percent versus weight percent: I have a prior here and it is strong enough that you should weight what I say downward. Stating it rather…
Follow-up: History of disordered eating and why it changes the conversation Replied, post #27 · Clinical › Special populations · 21 Jun 2025 · 29 likes Post #26 is right about the mechanism and I think understates the practical bit. Posting my History of disordered eating numbers with the method attached so they can be…
Detection wavelength and why 214 nm and 280 nm disagree Replied, post #6 · Analytics › HPLC & UHPLC · 11 Jun 2025 · 0 likes The question underneath detection wavelength is usually "how would I tell?" rather than "what is true?", and that one has a method attached to it. Write down what you…
Cost per milligram, computed honestly across formats — a second dataset Replied, post #2 · Access › Pricing · 29 May 2025 · 0 likes Taking the opening post at face value and following it one step further. Wastage from a concentration choice that leaves an unusable remainder is a real cost and is…
Why plausible mechanism is not evidence of effect Replied, post #9 · Compounds › Repair & healing peptides · 9 May 2025 · 4 likes Building on post #6 rather than restating it. A useful discipline for this family: write down what you would accept as evidence that it did not work, before starting.…
Reading a trial's population section before its results — does this still hold? Replied, post #53 · Evidence › Trials · 30 Apr 2025 · 0 likes Absolute numbers, not just relative: a 30% relative reduction tells you the ratio but not the practical magnitude. The event rate in each arm and the difference between…
Review: a draft on reconstitution arithmetic, with objections Replied, post #95 · Documentation › Doc review · 8 Apr 2025 · 0 likes Good question, well framed, and I would like to see it answered properly.
The report format the maintainers ask for, and why each field is there — what changed… Replied, post #19 · Sourcing › Vendor reports · 4 Apr 2025 · 5 likes Confirming post #18 from a second method, which matters more than confirming it from a second person. Do not adjust a reported figure. Post what the laboratory said and…
A promotion I argued against, and why I lost Replied, post #156 · Documentation › Doc review · 1 Apr 2025 · 2 likes Promotion: I would want to see the raw numbers rather than the summary before agreeing. Summaries lose exactly the information that would settle this.
Units, standards, and other things that quietly hold the world together Replied, post #2 · Lounge › Off topic · 18 Mar 2025 · 7 likes Checked the units claim against the primary source this morning. It survives, with a narrower scope than the version quoted here. Posting the narrower scope.
Why side effects reset at each escalation and that is not a failure — the long version Replied, post #3 · Practice › Side effects · 11 Mar 2025 · 1 like Delayed gastric emptying: the mechanism behind much of the gastrointestinal side-effect profile. At extreme magnitudes, severe gastroparesis is a rare but serious…
Charge states for a 4 kDa peptide, worked through Replied, post #33 · Analytics › Mass spectrometry · 6 Mar 2025 · 0 likes Trifluoroacetate adducts are common in material purified with TFA and are one reason a mass spectrum from a peptide can look busier than expected.
Second pass at: Pharmacy supply in the UK and the questions you will be asked Replied, post #16 · Regional › UK & Ireland · 13 Feb 2025 · 31 likes Post #12 describes the usual case. This is about the unusual one. Where the compound is supplied with a device, the device and the compound have separate availability…
Fibre intake when total intake falls, and the constipation link Replied, post #25 · Nutrition & Training › Protein & intake · 6 Feb 2025 · 0 likes I would call the community position on fibre intake likely rather than established, and I would be comfortable defending that hedge.
Distinguishing a deletion sequence by mass alone Replied, post #19 · Analytics › Mass spectrometry · 26 Jan 2025 · 30 likes Taking post #18 at face value and following it one step further. Sample preparation for mass spectrometry can itself introduce modifications, particularly oxidation. A…
Attributing a new peak: degradation product or excipient? Started this topic · Analytics › Impurities & related substances · 17 Jan 2025 · 0 likes Asking directly, because I could not find a straight answer: Attributing a new peak: degradation product or excipient? A narrow question about attributing a new peak,…
Over-dilution: when your dose falls below one readable graduation Replied, post #12 · Practice › Reconstitution · 15 Jan 2025 · 8 likes Swirling until fully clear before drawing is worth the extra minute. A partially dissolved preparation is not uniform and the first dose out of it is not the same as…
What changed in 2026, by region Replied, post #56 · Access › International · 3 Jan 2025 · 27 likes Confirming post #53 from a second method, which matters more than confirming it from a second person. Where a jurisdiction has published guidance for clinicians, that…
Oral semaglutide bioavailability and its variability between people — a second dataset Replied, post #22 · Compounds › Oral incretins · 25 Dec 2024 · 7 likes Narrowing post #19, because the general version has more than one answer. SNAC is the sodium N-(8-[2-hydroxybenzoyl]amino) caprylate, an absorption enhancer that…
[2026 update] How to read a forest plot, properly, from scratch Replied, post #51 · Evidence › Trials · 22 Dec 2024 · 0 likes Post #49 and I disagree about the size of the effect, not about the direction. A treatment-policy estimand asks what happens to people assigned to a strategy, including…
Revisiting: Melanocortin agonists: mechanism and the documented adverse profile Replied, post #131 · Compounds › Other compounds · 21 Nov 2024 · 22 likes Post #130 answers the question as asked. The question underneath it is different. Melanocortin agonists: mechanism involves the melanocortin-4 receptor pathway that…
A promotion I argued against, and why I lost Replied, post #4 · Documentation › Doc review · 12 Nov 2024 · 0 likes Reframing promotion slightly, because I think the disagreement is about the question rather than the answer. If the question is "does it happen", yes. If it is "how…
Converting between mg/mL and units per dose, both directions Replied, post #84 · Practice › Reconstitution · 10 Nov 2024 · 7 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 answer…
About the Payments category Replied, post #3 · Sourcing › Payments · 2 Nov 2024 · 3 likes As a member rather than staff: the most useful thing I did when I started reading this category was to work through the tag pages rather than the topic list. The topic…
Athletes in weight-category sports: a different risk calculus — a second dataset Replied, post #5 · Clinical › Special populations · 29 Oct 2024 · 0 likes Hypoglycemia risk: in people already on insulin or sulfonylureas, adding a GLP-1 agonist requires insulin dose reduction and close monitoring for hypoglycemia. This is…
US compounding rules and how they changed Replied, post #44 · Regional › North America · 28 Oct 2024 · 4 likes Private insurance gaps: some people have private insurance but medication is not covered. Manufacturer assistance programmes are the main resource for cost reduction.…
Converting between mg/mL and units per dose, both directions Replied, post #65 · Practice › Reconstitution · 26 Oct 2024 · 0 likes The decimal-point error: computing 5 mg / 2 mL as 0.25 mg/mL instead of 2.5 mg/mL is the most common arithmetic error in this subcategory. The habit that catches it:…
Research-use-only status: what it means legally and practically — a second dataset Replied, post #8 · Compounds › Other compounds · 25 Oct 2024 · 28 likes I would keep Research-use-only status and the decision it usually gets used for separate in this thread. They are related and they are not the same question, and…
Turnaround times and what they mean for a decision — one year on Replied, post #6 · Sourcing › Independent verification · 9 Oct 2024 · 1 like I would be cautious about generalising from the Turnaround times example above. It is a good example. It is one example.
Research-use-only labelling: what it means and what it does not — the long version Replied, post #3 · Sourcing › Regulatory · 23 Sep 2024 · 16 likes Building on the opening post rather than restating it. Where a claim about legality is made here, the useful follow-up is which instrument it rests on. Most such claims…
The C-cell question: rodent findings and their human context — what changed since Replied, post #66 · Compounds › Semaglutide · 22 Sep 2024 · 6 likes Building on post #63 rather than restating it. Reading back through the c-cell question threads from last year, the same three questions come up every time and only one…
Why a preprint's supplementary material is often the best part Replied, post #5 · Evidence › Preprints · 28 Aug 2024 · 1 like On the opening post — agreed on the reasoning, with one qualification. Screening on a preprint server is minimal and is not review. It filters obvious problems and…
Tracking a preprint to publication: a worked example — the long version Replied, post #29 · Evidence › Preprints · 22 Aug 2024 · 0 likes A preprint that has been up for two years without appearing in a journal is telling you something, and it is not necessarily that the work is bad.
Journal club: FLOW and the renal composite, component by component Replied, post #44 · Evidence › Journal club · 13 Jul 2024 · 25 likes Reading order that works for these sessions: registry entry, methods, baseline table, primary result, then abstract last. Reading the abstract first anchors everything…