j.ivaturi

TL2 · Uppsala

Contributes reviews on supplier material. Based in Uppsala.

Joined 30 April 2025 · last posted 2d

89 posts, newest first. Showing up to 150.

Tracking a shortage from primary sources rather than rumour Replied, post #125 · Access › Shortages · 26 Jul 2026 · 1 like Planning around a known shortage window is easier than reacting to one, and the notices give advance warning more often than people expect. It is the sort of thing that…
Angle of injection and whether 90 degrees is always right — the long version Replied, post #54 · Practice › Administration · 24 Jul 2026 · 3 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. That…
Reflectance and photometric devices: precision in practice — a second dataset Replied, post #80 · Analytics › Home & field testing · 24 Jul 2026 · 6 likes On post #76 — agreed on the reasoning, with one qualification. If you are new and reading this thread for the answer to Reflectance and photometric devices: the answer…
Spreadsheets: an appreciation — what changed since Replied, post #101 · Lounge › Off topic · 15 Jul 2026 · 0 likes Spreadsheets is a question about a distribution, not about a value, and treating it as a value is what produces the confident wrong answers.
How much context is too much context in a first post? Replied, post #63 · Start Here › How to Ask · 9 Jul 2026 · 28 likes Chromatography questions need the method before anything else: column, gradient, wavelength, injection volume. A purity figure with no method attached cannot be…
Here for the analytics and not much else Replied, post #12 · Lounge › Introductions · 9 Jul 2026 · 5 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…
Request: tag synonyms surfaced in search Replied, post #11 · Meta › Feature requests · 4 Jul 2026 · 0 likes Request from the analytics side: allow a table in a post to be marked as data rather than layout, so it can be copied without the formatting. Half the tables here are…
Journal club: SUSTAIN 6 and its retinopathy signal Replied, post #5 · Evidence › Journal club · 28 Jun 2026 · 0 likes What I would tell a new member reading about SUSTAIN 6 for the first time: the confident posts are not the reliable ones, and the reliable ones are longer.
Carryover and the ghost peak from last week's standard — what changed since Replied, post #66 · Analytics › HPLC & UHPLC · 24 Jun 2026 · 0 likes Summarising the Carryover thread so far, since it is long and the answer is buried: the first reply has the method, the fourth has the correction to it, and the rest is…
Second pass at: Absence of evidence and evidence of absence Replied, post #24 · Research Methods › Statistics · 17 Jun 2026 · 0 likes Worth stating the null on Absence of evidence before we explain it: the observation may be nothing. That possibility deserves a sentence and usually does not get one.
Coming back to: Specificity, linearity, accuracy, precision, range, robustness — with… Replied, post #55 · Analytics › Method validation · 16 Jun 2026 · 9 likes Post #51 put the caveat in the right place and I want to underline it. Specificity: the method can distinguish the intended compound from related impurities and…
The anatomy of a question that gets answered within an hour Replied, post #77 · Start Here › How to Ask · 14 Jun 2026 · 18 likes Post #74 is right about the mechanism and I think understates the practical bit. If the answer you got does not fit your case, say which part does not fit rather than…
Official shortage notices and what they authorise Replied, post #102 · Access › Shortages · 12 Jun 2026 · 1 like Managing an unplanned gap: if a shortage causes a gap in treatment, the questions are how long the gap will be and how that affects your condition. Discussing with your…
Request: a per-category review queue Replied, post #32 · Meta › Feature requests · 12 Jun 2026 · 3 likes Post #30 describes the usual case. This is about the unusual one. Request that would help newcomers more than regulars: show the subcategory description on hover in the…
[2026 update] Interpreting a result that disagrees with the supplier's certificate Replied, post #12 · Sourcing › Independent verification · 11 Jun 2026 · 17 likes Combining a chromatographic result with a documentation review gives a more complete picture than two chromatographic results, because the failure modes are different.
Pancreatitis history and the risk calculus Replied, post #17 · Safety › Contraindications · 8 Jun 2026 · 32 likes Answering the question post #13 raises rather than the one it answers. History of pancreatitis: these compounds can rarely trigger pancreatitis. History of pancreatitis…
Injection volume, overload, and peak distortion Replied, post #41 · Analytics › HPLC & UHPLC · 8 Jun 2026 · 12 likes What I would want before treating injection volume as settled: the method, the sample, and whether anyone tried to find the opposite result. Two of the three are…
Second pass at: When your prescriber and the evidence disagree Replied, post #31 · Clinical › Prescriber conversations · 5 Jun 2026 · 8 likes The confident answers on prescriber and the well-sourced answers are not the same answers, which is the most useful thing I have learned reading this category.
Second pass at: The storage lookup and where its data comes from Replied, post #26 · Data & Tools › Calculators · 4 Jun 2026 · 0 likes If someone has run storage lookup properly I would rather read that than my own reconstruction of it. Posting mine only because the thread has gone quiet.
Peak-to-trough ratio at steady state for a weekly agent Replied, post #28 · Pharmacology › Pharmacokinetics · 1 Jun 2026 · 5 likes Worth separating two things that post #27 runs together. Metabolism for peptide drugs is proteolytic rather than hepatic in the usual sense, which is why the cytochrome…
Second pass at: A pooled estimate that changed when one trial was added Replied, post #15 · Evidence › Meta-analyses · 28 May 2026 · 29 likes I read the earlier replies on pooled estimate twice before writing this, because I had assumed the opposite and wanted to be sure I was disagreeing with what was said…
Batch numbers that do not match the vial label — what changed since Replied, post #22 · Sourcing › Red flags · 26 May 2026 · 0 likes I have three months of notes on Batch numbers and the honest summary is that the trend is real and the week-to-week numbers are noise. I nearly drew the opposite…
Risk-of-bias tools and the judgement they conceal — does this still hold? Replied, post #9 · Evidence › Meta-analyses · 25 May 2026 · 30 likes Study quality and weighting: some meta-analyses weight all studies equally; others weight by study size or study quality. The choice affects the result and should be…
Coming back to: Swirling versus inverting versus leaving it alone Replied, post #16 · Practice › Reconstitution · 24 May 2026 · 4 likes This settles it for me, at least until somebody posts a reason it should not.
Journal club: indirect comparison between two programmes, defended and attacked Replied, post #63 · Evidence › Journal club · 21 May 2026 · 4 likes Post #62 describes the usual case. This is about the unusual one. Where the indirect comparison reasoning breaks down for me is the step from the group result to the…
Private prescribing in the UK: what is actually involved Replied, post #18 · Regional › UK & Ireland · 19 May 2026 · 2 likes Narrowing post #15, because the general version has more than one answer. Private prescribing is a question about a distribution, not about a value, and treating it as…
Pinch or no pinch, and how needle length changes the answer — what changed since Replied, post #23 · Practice › Administration · 4 May 2026 · 0 likes If you have to inject at a different time of day than usual, that is a much smaller perturbation than it feels for a weekly compound with a week-long half-life. A…
Follow-up: A parcel that arrived warm: a decision process, not a verdict Replied, post #8 · Practice › Storage & stability · 28 Apr 2026 · 22 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. Happy to expand any of that if it is…
List price versus negotiated price versus what you pay Replied, post #70 · Access › Pricing · 14 Apr 2026 · 2 likes Worth separating two things that post #66 runs together. Adding what did not work for me on list price versus negotiated price, since the failures never get written up…
Revisiting: Drawing up with one needle and injecting with another Replied, post #41 · Practice › Administration · 4 Apr 2026 · 4 likes Post #39 put the caveat in the right place and I want to underline it. If you have to inject at a different time of day than usual, that is a much smaller perturbation…
Research-use-only status: what it means legally and practically Replied, post #20 · Compounds › Other compounds · 28 Mar 2026 · 4 likes Where I part company with post #16, and it is a narrow parting. Thymosin alpha-1 has a regulatory history in several jurisdictions and a real clinical literature, which…
Preprint servers and what screening they do Replied, post #99 · Evidence › Preprints · 23 Mar 2026 · 17 likes Post #96 is right about the mechanism and I think understates the practical bit. Always label it as a preprint in any discussion. A preprint is not a published trial…
Completing a dose with a second syringe, and the dead-volume arithmetic Replied, post #16 · Practice › Administration · 17 Mar 2026 · 11 likes Nothing in this subcategory is medical advice and none of it is a substitute for a demonstration from somebody qualified to give one, which most prescribers will do…
Oral versus injected administration claims for BPC-157 Replied, post #8 · Compounds › Repair & healing peptides · 11 Mar 2026 · 17 likes The confident answers on oral versus injected administration claims and the well-sourced answers are not the same answers, which is the most useful thing I have learned…
An ABAB design with a data table and honest limitations — a second dataset Replied, post #37 · Research Methods › N-of-1 designs · 5 Mar 2026 · 0 likes I had written a reply contradicting post #33 and deleted it. Here is what survived. The question underneath ABAB design is usually "how would I tell?" rather than "what…
Measurement error in a self-reported exposure Replied, post #75 · Evidence › Study critique · 25 Feb 2026 · 9 likes I read post #71 twice before replying, because I had assumed the opposite. Hold a trial to the standard something could actually have met. A criticism that no…
Storing lyophilised material long term: what governs the shelf life Replied, post #75 · Practice › Storage & stability · 21 Feb 2026 · 0 likes Clarity is a weak test. A solution can lose a significant fraction of its active content to degradation or adsorption while remaining perfectly clear.
Adducts: sodium, potassium, and the peak you did not expect — does this still hold? Replied, post #40 · Analytics › Mass spectrometry · 17 Feb 2026 · 2 likes Two questions I would want answered before drawing anything from the Adducts data above: how were the cases selected, and what happened to the ones that dropped out.
Common supplements people ask about, assessed one at a time — a second dataset Replied, post #52 · Practice › Interactions · 15 Feb 2026 · 0 likes Adding a small correction to the Common supplements summary above rather than a disagreement with it. The substance holds; one of the figures is out by a factor that…
Angle of injection and whether 90 degrees is always right Replied, post #87 · Practice › Administration · 23 Jan 2026 · 9 likes If you have to inject at a different time of day than usual, that is a much smaller perturbation than it feels for a weekly compound with a week-long half-life.
Interpreting a result that disagrees with the supplier's certificate Replied, post #87 · Sourcing › Independent verification · 19 Jan 2026 · 0 likes Worth separating two things that post #83 runs together. Where I have landed on interpreting a result, having got it wrong once in public: the direction is clear, the…
A history of disordered eating: proceeding carefully Replied, post #66 · Wellbeing › Mental health · 19 Jan 2026 · 7 likes What I want from this history of disordered eating thread is the list of things that would need to be true for the claim to hold. If we can write that list, we can…
Second pass at: What "verified" means on our vendor pages, stated narrowly Replied, post #56 · Sourcing › Vendor reports · 11 Jan 2026 · 0 likes Where I part company with post #54, and it is a narrow parting. Dosing and purity: a vial that is 99% pure might contain 80% of its label claim if the other mass is…
Non-inferiority margins: how they are chosen and how they are abused — a second dataset Replied, post #2 · Evidence › Trials · 2 Jan 2026 · 31 likes Pre-specification is the property that makes a primary endpoint trustworthy. An endpoint chosen after seeing the data can be the best endpoint in the world and it no…
Vomiting: when it is expected and when it is a reason to stop Replied, post #85 · Practice › Side effects · 29 Dec 2025 · 0 likes The relationship between symptom burden and outcome is not what people assume. Feeling worse is not evidence of a larger effect and feeling nothing is not evidence of…
Citation sweep results: how many references did not say what was claimed Replied, post #19 · Meta › Wiki maintenance · 19 Dec 2025 · 0 likes Helpful, and short, which on this subject is harder than long.
Oral semaglutide bioavailability and its variability between people Replied, post #20 · Compounds › Oral incretins · 10 Dec 2025 · 28 likes The practical argument for an oral is adherence, and the published adherence data is less flattering than the argument. Daily dosing with fasting requirements is not…
Why an oral GLP-1 agonist is a formulation achievement more than a chemistry one Replied, post #81 · Compounds › Oral incretins · 8 Dec 2025 · 4 likes Timing consistency matters more for oral dosing than for weekly injection, because absorption depends on the state of the stomach and the state of the stomach varies…
Angle of injection and whether 90 degrees is always right Replied, post #62 · Practice › Administration · 7 Dec 2025 · 11 likes Small methodological point on angle of injection: repeating a measurement is cheap and resolves most of what is being argued about here at no cost to anyone.
The nausea timeline across the first four weeks, with a tabulated log — what changed since Replied, post #17 · Practice › Side effects · 17 Nov 2025 · 0 likes I read post #15 twice before replying, because I had assumed the opposite. Adding what did not work for me on nausea timeline, since the failures never get written up…
Revisiting: Why tirzepatide titration schedules have more steps than semaglutide's Replied, post #88 · Compounds › Tirzepatide · 17 Nov 2025 · 2 likes Nothing to add on the substance. Thank you for taking the question at face value.
Availability by country, dated, with primary sources Replied, post #59 · Access › International · 14 Nov 2025 · 7 likes Where a compound is approved under a different trade name in another market, searching the local name finds documents the English name does not. Not a strong opinion,…
What pooling buys you and what it destroys Replied, post #59 · Evidence › Meta-analyses · 5 Nov 2025 · 3 likes Double extraction with disagreement resolution is standard and is worth checking for, because single extraction errors are common and non-random. Reporting the…
Second pass at: The mass-error checker and its intended scope Replied, post #53 · Data & Tools › Calculators · 2 Nov 2025 · 18 likes Adding a note of thanks rather than an opinion. I did not know most of that.
Interpreting a result that disagrees with the supplier's certificate Replied, post #3 · Sourcing › Independent verification · 1 Nov 2025 · 16 likes Interpreting a result looks different depending on whether you are reading the primary literature or the summaries of it, and the difference is not in our favour.
Payment mechanics and the recovery options that do not exist Replied, post #76 · Sourcing › Payments · 22 Oct 2025 · 3 likes No payment facilitation: this site does not handle payments and does not connect buyers and sellers for the purpose of payment. We discuss logistics and documentation…
Micronutrient adequacy at low total intake — does this still hold? Replied, post #22 · Nutrition & Training › Protein & intake · 8 Oct 2025 · 1 like On post #20 — agreed on the reasoning, with one qualification. Fibre and fluid tend to fall alongside protein when intake drops, and the constipation reported here…
Specificity, linearity, accuracy, precision, range, robustness — with real criteria — a… Replied, post #30 · Analytics › Method validation · 5 Oct 2025 · 12 likes Where I part company with post #26, and it is a narrow parting. Precision has two levels worth distinguishing: repeatability within a run and intermediate precision…
Persistent vomiting and the threshold for seeking help Replied, post #30 · Safety › Adverse events · 7 Sep 2025 · 0 likes Signs of dehydration after repeated vomiting are the most common serious secondary problem described here and are also the most preventable.
Second pass at: A history of disordered eating: proceeding carefully Replied, post #122 · Wellbeing › Mental health · 30 Aug 2025 · 6 likes Motivation and expectation: starting with clear motivation and realistic expectations about what will happen and when helps with psychological adjustment. Nothing above…
NHS criteria and how they are applied in practice — the long version Replied, post #2 · Regional › UK & Ireland · 24 Aug 2025 · 24 likes NHS criteria has been discussed here with more heat than it deserves, mostly because two definitions have been in play the whole time.
Temperature loggers worth the money Replied, post #17 · Devices › Cold chain · 10 Aug 2025 · 27 likes Lyophilised material is far more tolerant of a warm transit than a solution would be, which is why suppliers ship dry and why an excursion is not automatically a loss.…
Reading a supplier's product description as a marketing document Replied, post #52 · Compounds › Other compounds · 2 Aug 2025 · 0 likes A compound with no established assay is a compound where a certificate can say almost anything. That is not an accusation about anyone; it is a statement about what a…
What a 2 ppm match establishes, and what it does not Replied, post #34 · Analytics › Mass spectrometry · 17 Jul 2025 · 7 likes Resolution and mass accuracy are different specifications. An instrument can resolve two species and still assign their masses imprecisely, and the reverse is also…
[2026 update] Citation sweep results: how many references did not say what was claimed Replied, post #44 · Meta › Wiki maintenance · 17 Jul 2025 · 6 likes Wiki hygiene point: every edit here should say what changed and why in the note, not what section it touched. "Fixed typo" and "corrected the concentration in example…
Follow-up: Why the titration planner refuses to produce a schedule below a floor Replied, post #35 · Data & Tools › Calculators · 26 Jun 2025 · 6 likes Adding the measurement that post #34 says would settle it. Mass error checking: enter your observed mass and theoretical mass and check whether the difference in ppm is…
Repeatability versus intermediate precision Replied, post #17 · Analytics › Method validation · 19 Jun 2025 · 11 likes Taking post #16 at face value and following it one step further. Where a pharmacopoeial monograph exists, a method that follows it inherits a great deal of assurance.…
Second pass at: How to research a compound with no human data without deceiving yourself Replied, post #66 · Compounds › Other compounds · 14 Jun 2025 · 11 likes Picking up post #65: that is the part I would want checked first. How to research a compound with no human data: mechanistic plausibility is one input. Preclinical data…
Pre-registering a personal experiment, seriously Replied, post #60 · Research Methods › N-of-1 designs · 31 May 2025 · 23 likes Generalisability: a robust n-of-1 result applies to you. It does not tell you much about whether the effect generalises to others similar to you, much less to people…
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly Replied, post #88 · Compounds › Tirzepatide · 19 May 2025 · 0 likes Taking post #86 at face value and following it one step further. Tirzepatide's half-life of roughly five days means steady state is approached in about three weeks…
Lean mass preservation: what the evidence supports Replied, post #21 · Outcomes › Body composition · 18 May 2025 · 21 likes A note on how lean mass preservation gets discussed rather than on lean mass preservation itself: the confident posts get the replies and the careful ones get ignored,…
Second pass at: Designing a personal experiment that could change your mind Replied, post #2 · Research Methods › N-of-1 designs · 15 May 2025 · 0 likes Duration should be set by how long an effect would take to appear rather than by patience. Stopping early is the commonest reason a personal experiment answers nothing.
Follow-up: Tesamorelin has an approved indication — what that changes about the evidence Replied, post #60 · Compounds › Secretagogues & GH axis · 11 May 2025 · 0 likes That is a cleaner way of putting what I was circling around.
Delayed gastric emptying and oral medication absorption: which drugs matter Replied, post #54 · Practice › Interactions · 20 Apr 2025 · 1 like Delayed gastric emptying and oral would be much easier to settle if anyone reported the denominator. Almost nobody reports the denominator.
When "no data" is the complete and final answer Replied, post #129 · Compounds › Other compounds · 26 Mar 2025 · 12 likes Distinguishing marketed research compounds from true chemical synthesis: some online suppliers sell compounds that are genuinely novel and difficult to obtain…
Charge states for a 4 kDa peptide, worked through Replied, post #132 · Analytics › Mass spectrometry · 17 Mar 2025 · 0 likes On post #130 — agreed on the reasoning, with one qualification. Speaking only to charge states as I have actually seen it, rather than as it is usually described: the…
Charge states for a 4 kDa peptide, worked through Replied, post #92 · Analytics › Mass spectrometry · 13 Mar 2025 · 1 like Adding what did not work for me on charge states, since the failures never get written up and they are half the useful information.
Biased agonism: a real phenomenon, an over-used explanation Replied, post #74 · Pharmacology › Receptor biology · 10 Mar 2025 · 0 likes Reading rather than contributing, but this is the most useful thread I have found on it.
Talking to a therapist about this specifically — does this still hold? Replied, post #26 · Wellbeing › Mental health · 7 Mar 2025 · 24 likes Reading rather than answering, but this is the post I would point somebody at.
Follow-up: What other technical communities get right that we do not Replied, post #30 · Lounge › Off topic · 3 Mar 2025 · 33 likes That is true everywhere. The reference material that gets used is the material that answers a question you have at the moment you have it, and glamour has nothing to do…
Revisiting: Semaglutide formulation: what is in the licensed product besides the peptide Replied, post #32 · Compounds › Semaglutide · 23 Dec 2024 · 0 likes On the injection-day question: the labelling for licensed semaglutide allows the day to be changed provided at least two days separate the two injections. That interval…
Why "any advice?" is the least effective ending for a post Replied, post #118 · Start Here › How to Ask · 7 Dec 2024 · 9 likes A photograph of a vial is rarely useful and a photograph of a document usually is. Redact the identifiers before you post either.
Research-use-only labelling: what it means and what it does not — the long version Replied, post #38 · Sourcing › Regulatory · 4 Dec 2024 · 0 likes Confirming post #35 from a second method, which matters more than confirming it from a second person. Where I have landed on Research-use-only labelling, having got it…
[2026 update] Journal club: SURPASS-2 and the semaglutide 1 mg comparator Replied, post #44 · Evidence › Journal club · 27 Nov 2024 · 10 likes Building on post #42 rather than restating it. I read the earlier replies on SURPASS-2 twice before writing this, because I had assumed the opposite and wanted to be…
UK access routes, dated and sourced — a second dataset Replied, post #8 · Regional › UK & Ireland · 18 Nov 2024 · 18 likes Cost comparisons should state whether they include the consultation, the device, the needles and the follow-up, because those differ between routes.
US compounding rules and how they changed Replied, post #35 · Regional › North America · 22 Oct 2024 · 0 likes Formulary position changes on a schedule that is published in advance, which means a decision made now may be answering last year's formulary. That holds for the case…
Guidelines revision: what changed and why Replied, post #80 · Meta › Announcements · 27 Jul 2024 · 14 likes The rare case here is the one that costs somebody a week, though, and the common case costs everyone ten seconds. I think the trade is clearly correct.
Splitting a weekly dose in two: the pharmacokinetic argument against — the long version Replied, post #99 · Practice › Dosing & titration · 9 Jul 2024 · 5 likes Stepping down deliberately: the withdrawal trials show that stopping is followed by regain. The step-down literature is thinner. The conservative assumption is that…
Assessing a warm arrival: the decision process — one year on Replied, post #20 · Sourcing › Logistics · 29 May 2024 · 3 likes Post #16 describes the usual case. This is about the unusual one. Anyone deciding whether a delay is a problem should ask what would change if they waited another week.…