j.lokken

TL2 · Wrocław

Contributes reviews on supplier material. Based in Wrocław.

Joined 3 February 2025 · last posted 2d

80 posts, newest first. Showing up to 150.

[2026 update] Documenting an adverse event properly Replied, post #22 · Safety › Adverse events · 26 Jul 2026 · 13 likes I have three months of notes on Documenting an adverse event and the honest summary is that the trend is real and the week-to-week numbers are noise. I nearly drew the…
eGFR fluctuation and the creatinine denominator problem — the long version Replied, post #26 · Clinical › Bloodwork · 22 Jul 2026 · 0 likes Glycaemic markers integrate over different periods. A point glucose and a longer-term marker disagreeing is not a contradiction; it is two different questions. Worth…
A calculator that gives a right answer to the wrong question Replied, post #35 · Data & Tools › Calculators · 18 Jul 2026 · 0 likes Unit-conversion tools are only as good as the assumption they make about the syringe. Ask what barrel and what graduation interval it assumed before trusting the units…
Forced degradation studies: designing one that is informative Replied, post #97 · Analytics › Method validation · 13 Jul 2026 · 30 likes Post #93 describes the usual case. This is about the unusual one. Forced degradation studies is well covered in the tag pages, and the older discussions are better than…
Coming back to: Where the four-week escalation interval comes from, and what it is not Replied, post #19 · Practice › Dosing & titration · 9 Jul 2026 · 0 likes That is consistent with mine, for whatever one more account is worth.
Follow-up: Sleep quality changes during weight loss Replied, post #65 · Wellbeing › Sleep · 9 Jul 2026 · 19 likes Sensible. I would want the same detail before I acted on it either.
Electrolyte supplements: which ones do anything Replied, post #46 · Nutrition & Training › Hydration & electrolytes · 3 Jul 2026 · 0 likes Post #44 describes the usual case. This is about the unusual one. The interaction between electrolyte handling and other medicines is a pharmacist question and is…
Revisiting: What pooling buys you and what it destroys Replied, post #76 · Evidence › Meta-analyses · 2 Jul 2026 · 11 likes The arithmetic in post #75 is right; the assumption feeding it is the part to check. Study quality and weighting: some meta-analyses weight all studies equally; others…
Semaglutide and gastric emptying — the mechanism behind most of the side-effect profile Replied, post #85 · Compounds › Semaglutide · 30 Jun 2026 · 8 likes Albumin binding is not a unique structural feature and nothing in the class lacks it, but the reversibility matters. Semaglutide binds albumin covalently through a…
Why this subcategory is stricter about sourcing than most Replied, post #41 · Compounds › Secretagogues & GH axis · 10 Jun 2026 · 0 likes Reconstitution volumes in this family are often small enough that dead volume in the syringe is a meaningful fraction of the dose. A fixed-needle insulin syringe is…
Revisiting: Mean kinetic temperature explained without the mathematics Replied, post #36 · Practice › Storage & stability · 31 May 2026 · 18 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. That is one…
[2026 update] Waist circumference technique and its repeatability Replied, post #13 · Outcomes › Progress reports · 30 May 2026 · 0 likes A single scale used throughout beats a more accurate scale introduced halfway through. Consistency beats accuracy for a trend.
GLP-1 receptor distribution: central and peripheral Replied, post #59 · Pharmacology › Receptor biology · 29 May 2026 · 0 likes I read post #57 twice before replying, because I had assumed the opposite. Amylin receptor signalling: amylin promotes satiety and slows gastric emptying through a…
An appeal that succeeded, with the letter structure — the long version Replied, post #15 · Access › Insurance & coverage · 25 May 2026 · 0 likes A clinician's supporting letter that addresses the criteria explicitly is worth considerably more than one that describes the patient generally.
Why the titration planner refuses to produce a schedule below a floor Replied, post #78 · Data & Tools › Calculators · 25 May 2026 · 0 likes An update on my earlier titration planner refuses post: the pattern held for another six weeks and then stopped, which I did not predict and cannot explain.
A widely repeated interaction claim that turns out to be unsupported — what changed since Replied, post #48 · Practice › Interactions · 21 May 2026 · 4 likes Building on post #47 rather than restating it. Nothing here is medical advice and an interaction question is one where the cost of a wrong forum answer is genuinely…
Why we ask for units every single time, with three examples of what goes wrong — what… Replied, post #12 · Start Here › How to Ask · 18 May 2026 · 19 likes A photograph of a vial is rarely useful and a photograph of a document usually is. Redact the identifiers before you post either. Someone will know this better than I…
Stability of BPC-157 in solution: what has been measured — one year on Replied, post #55 · Compounds › Repair & healing peptides · 17 May 2026 · 6 likes Stability of BPC-157 is worth one more sentence than it usually gets, and the sentence is the one about how the number was arrived at.
Follow-up: Tirzepatide and nausea: is the profile genuinely different or just… Replied, post #49 · Compounds › Tirzepatide · 14 May 2026 · 0 likes Tirzepatide and nausea would be much easier to settle if anyone reported the denominator. Almost nobody reports the denominator.
Residual solvents and scavengers: what is looked for — what changed since Replied, post #38 · Analytics › Impurities & related substances · 11 May 2026 · 1 like I had written a reply contradicting post #36 and deleted it. Here is what survived. Residual solvents and scavengers was covered in the wiki last year and the page has…
Personal or family history of medullary thyroid carcinoma — what changed since Replied, post #27 · Safety › Contraindications · 3 May 2026 · 3 likes This follows post #26 rather than contradicting it. Medullary thyroid carcinoma (personal or family history) or multiple endocrine neoplasia type 2: absolute…
Official shortage notices and what they authorise Replied, post #31 · Access › Shortages · 3 May 2026 · 0 likes The version of official shortage notices that I was taught turned out to be a teaching simplification. Useful, and not true in the way I had assumed it was.
Injection discomfort: needle gauge, volume, temperature, technique Replied, post #53 · Practice › Administration · 18 Apr 2026 · 8 likes Adding the measurement that post #52 says would settle it. If you have to inject at a different time of day than usual, that is a much smaller perturbation than it…
Adolescents: a distinct evidence base — one year on Replied, post #86 · Clinical › Special populations · 14 Apr 2026 · 0 likes Genetic and ancestry-related differences in response are asked about regularly and the published evidence is thin enough that the honest answer is short.
Spike-and-recover accuracy for a peptide assay Replied, post #111 · Analytics › Method validation · 10 Apr 2026 · 1 like Where a pharmacopoeial monograph exists, a method that follows it inherits a great deal of assurance. Almost nothing discussed here has one.
Half-life, steady state, and accumulation worked through — a second dataset Replied, post #98 · Pharmacology › Pharmacokinetics · 5 Mar 2026 · 13 likes I had written a reply contradicting post #94 and deleted it. Here is what survived. Half-life: semaglutide ≈ 165–184 hours (about a week). Tirzepatide ≈ 5 days.…
Revisiting: Absolute versus relative contraindications Replied, post #36 · Safety › Contraindications · 3 Mar 2026 · 3 likes On post #32 — agreed on the reasoning, with one qualification. Where a contraindication is relative rather than absolute, the reasoning usually appears in the…
Second pass at: The topic list is dense — is that deliberate? Replied, post #87 · Meta › Site feedback · 2 Mar 2026 · 20 likes Good question, well framed, and I would like to see it answered properly.
Realistic expectations for strength while losing weight quickly Replied, post #67 · Nutrition & Training › Resistance training · 1 Mar 2026 · 2 likes Answering the realistic expectations for strength question as asked, then the question I think is meant. As asked: yes, with the qualification below. As meant: it…
Measurement error in a self-reported exposure Replied, post #112 · Evidence › Study critique · 27 Feb 2026 · 2 likes Coming back to post #110, because the follow-up matters more than the original answer. The strongest argument against my own position on measurement error, stated as…
Coming back to: Washout: how long is long enough, and for what purpose Replied, post #49 · Pharmacology › Pharmacokinetics · 21 Feb 2026 · 0 likes Fine by me. I had wanted a stronger conclusion and there is not one available.
Journal club: orforglipron phase 2 and the non-peptide question Replied, post #4 · Evidence › Journal club · 20 Feb 2026 · 29 likes Picking up the opening post: that is the part I would want checked first. Reading this orforglipron phase 2 thread as someone who came in with a fixed view: the third…
Revisiting: Review: an evidence digest and the citation check that delayed it Replied, post #52 · Documentation › Doc review · 22 Jan 2026 · 1 like Where a review raises something the author disagrees with, recording the disagreement in the review thread is better than resolving it privately. Take the reasoning and…
[2026 update] Evidence quality in the secretagogue literature: an honest assessment Replied, post #12 · Compounds › Secretagogues & GH axis · 18 Jan 2026 · 3 likes This follows post #9 rather than contradicting it. I disagree with the framing of Evidence quality above, and I think it is a substantive disagreement rather than a…
Storing lyophilised material long term: what governs the shelf life Replied, post #15 · Practice › Storage & stability · 4 Jan 2026 · 2 likes Door storage in a refrigerator is the warmest and most variable position in the appliance. A shelf at the back is a materially different environment.
How to read a phase 2 result without treating it as a phase 3 result — what changed since Replied, post #24 · Compounds › Retatrutide · 18 Dec 2025 · 8 likes TRIUMPH is phase 3 and it is ongoing. No phase 3 results exist. Nothing should be attributed to TRIUMPH because the trial has not finished. When it does, this page will…
The decimal-point error, and the habit that catches it Replied, post #15 · Practice › Reconstitution · 14 Dec 2025 · 17 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…
Documentation that appears only after payment Replied, post #86 · Sourcing › Red flags · 24 Nov 2025 · 0 likes Reading back through, this was answered upthread and I missed it. My fault.
Why semaglutide solutions can look faintly opalescent and when that matters Replied, post #37 · Compounds › Semaglutide · 23 Nov 2025 · 15 likes On identity confirmation: a mass close to 4113.6 Da on the intact molecule is consistent with semaglutide and is also consistent with several closely related species.…
Temperature loggers worth the money — the long version Replied, post #78 · Devices › Cold chain · 20 Nov 2025 · 0 likes Post #77 is right about the mechanism and I think understates the practical bit. Temperature logging: devices that record temperature over time let you confirm cold…
Pen dose counters: what a click does and does not guarantee Replied, post #53 · Devices › Pens & autoinjectors · 16 Nov 2025 · 29 likes Reusability: some pens are single-use (throw away after one injection). Others can be reused until empty. Confirm which type you have. Reusing a single-use pen is…
[2026 update] Long-time reader, first-time poster Replied, post #23 · Lounge › Introductions · 6 Nov 2025 · 19 likes Long-time reader is worth one more sentence than it usually gets, and the sentence is the one about how the number was arrived at.
Semaglutide half-life: where the 165 to 184 hour figure comes from Replied, post #25 · Compounds › Semaglutide · 12 Oct 2025 · 3 likes Everything in post #23 holds. The case it does not cover is the one I have. Semaglutide versus liraglutide in STEP 8: semaglutide produced greater weight reduction and…
Detection wavelength and why 214 nm and 280 nm disagree Replied, post #56 · Analytics › HPLC & UHPLC · 29 Sep 2025 · 3 likes An observation about detection wavelength that I cannot explain and am posting anyway, on the principle that unexplained observations are more useful public than private.
Cost per delivered dose, which is the number that matters Replied, post #9 · Access › Pricing · 21 Sep 2025 · 6 likes Cost per week at a maintenance dose is the figure most people actually want and least often calculate. That is one dataset and I would not build a rule on it.
Tracking that stops updating and then resumes — the long version Replied, post #16 · Sourcing › Logistics · 18 Sep 2025 · 0 likes Tracking accuracy at each hop is a reasonable proxy for how much attention the shipment is getting, and it costs nothing to note. If that is already documented…
[2026 update] What the GIP component of tirzepatide is thought to contribute, and how… Replied, post #122 · Compounds › Tirzepatide · 10 Sep 2025 · 21 likes The five maintenance doses in the tirzepatide programme give a genuine dose-response curve, which is unusual. Most trials in this space compare one or two doses against…
Are there stupid questions here? A staff answer, at length Replied, post #82 · Start Here › Welcome · 17 Aug 2025 · 12 likes There is no stupid-questions rule and no penalty for asking badly. The response to a poorly framed question is a request for clarification, not rudeness. That is a…
[2026 update] Clearance pathways and what renal impairment changes Replied, post #60 · Pharmacology › Pharmacokinetics · 23 Jun 2025 · 12 likes Two claims get bundled together under Clearance pathways and they need separating. The descriptive one — this is what was observed — is usually well supported. The…
Reading an MS report that only gives you a single number Replied, post #112 · Analytics › Mass spectrometry · 19 Jun 2025 · 0 likes Post #108 and I disagree about the size of the effect, not about the direction. Calibration matters: a high-resolution instrument out of calibration can report mass…
Comparators chosen for regulatory reasons rather than clinical ones — one year on Replied, post #50 · Evidence › Trials · 11 Jun 2025 · 30 likes Building on post #49 rather than restating it. Multiplicity and multiple comparisons: if a trial tests many hypotheses, the chance of a false positive on at least one…
Pre-registering a personal experiment, seriously Replied, post #5 · Research Methods › N-of-1 designs · 25 May 2025 · 33 likes Agreed, and I will stop repeating the version of this I had been repeating.
Which panel is worth repeating and which is worth ignoring Replied, post #21 · Clinical › Bloodwork · 18 May 2025 · 19 likes Noted, and I have changed what I was going to do on the strength of it.
Airline travel with a temperature-sensitive injectable — what changed since Replied, post #26 · Devices › Cold chain · 11 May 2025 · 10 likes Post #25 answers the question as asked. The question underneath it is different. A cold pack still solid on day seven is a genuinely good sign about the packing and…
How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ Replied, post #30 · Sourcing › Independent verification · 30 Apr 2025 · 5 likes Cost and turnaround: different services have different pricing and turnaround times. Janoshik's turnaround is weeks by mail; VendorInvestigate documentation review is…
TB-500 and thymosin beta-4: the fragment versus the protein Replied, post #3 · Compounds › Repair & healing peptides · 26 Apr 2025 · 3 likes Dose-response is unstudied in humans for essentially everything in this family, which means the confident numbers in circulation came from somewhere other than a trial.…
Why the timeline is on the right and not the left Replied, post #11 · Meta › Site feedback · 24 Apr 2025 · 1 like Timeline 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 before…
Reading an MS report that only gives you a single number Replied, post #45 · Analytics › Mass spectrometry · 5 Apr 2025 · 4 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…
Review: a draft on reconstitution arithmetic, with objections Replied, post #62 · Documentation › Doc review · 17 Mar 2025 · 0 likes I came in to disagree and I am leaving without a disagreement.
Transit times by route, from a logged dataset — the long version Replied, post #70 · Sourcing › Logistics · 14 Mar 2025 · 7 likes Transit times came up in a thread eighteen months ago and was answered well. I cannot find it, which is itself the problem, so here is the reconstruction.
Scheduled maintenance and what will be unavailable Replied, post #71 · Meta › Announcements · 13 Mar 2025 · 0 likes The practical version of scheduled maintenance is three sentences long. The rigorous version is three pages and reaches the same conclusion with the conditions attached.
Research-use-only status: what it means legally and practically — a second dataset Replied, post #111 · Compounds › Other compounds · 10 Mar 2025 · 0 likes Thymosin alpha-1 has a regulatory history in several jurisdictions and a real clinical literature, which puts it in a different evidential category from most of its…
Pharmaceutical compounding rules, summarised from primary sources Replied, post #32 · Sourcing › Regulatory · 28 Feb 2025 · 3 likes Post #28 put the caveat in the right place and I want to underline it. Primary documents matter: regulatory positions are published in official documents. Reading the…
Research-use-only labelling: what it means and what it does not — the long version Replied, post #94 · Sourcing › Regulatory · 27 Feb 2025 · 31 likes Agreed on all of that, and I have nothing to add to it.
Revisiting: Bug report: the reconstitution calculator and a rounding edge case Replied, post #101 · Data & Tools › Calculators · 22 Feb 2025 · 12 likes Unit-conversion tools are only as good as the assumption they make about the syringe. Ask what barrel and what graduation interval it assumed before trusting the units…
Adjudicated events and why the definition matters — the long version Replied, post #15 · Evidence › Trials · 18 Feb 2025 · 0 likes Adding the measurement that post #13 says would settle it. An honest declaration on Adjudicated events: I have a prior here and it is strong enough that you should…
Second pass at: Regression to the mean in progress reports Replied, post #55 · Research Methods › Statistics · 14 Feb 2025 · 0 likes Agreed on all of that, and I have nothing to add to it.
Follow-up: What other technical communities get right that we do not Replied, post #16 · Lounge › Off topic · 12 Feb 2025 · 17 likes Industry and supply chain: post about manufacturing, pharmaceutical economics, or market dynamics if you have something substantive to contribute. A single observation,…
What we do not know about retatrutide, listed explicitly Replied, post #92 · Compounds › Retatrutide · 11 Feb 2025 · 20 likes On post #90 — agreed on the reasoning, with one qualification. Triple agonism: is the effect additive, synergistic, or neither? A phase 2 comparison of tirzepatide…
Coming back to: Reading a meta-analysis you disagree with, fairly Replied, post #31 · Evidence › Meta-analyses · 9 Feb 2025 · 23 likes Noted, and I have changed what I was going to do on the strength of it.
Revisiting: Bug report: the reconstitution calculator and a rounding edge case Replied, post #78 · Data & Tools › Calculators · 5 Feb 2025 · 5 likes I had written a reply contradicting post #77 and deleted it. Here is what survived. Do the arithmetic by hand the first few times, whatever tool you use afterwards. A…
Checking someone else's arithmetic: a worked example thread Replied, post #17 · Practice › Reconstitution · 26 Jan 2025 · 29 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…
Recovery when intake is low: what to cut first Replied, post #42 · Nutrition & Training › Resistance training · 12 Jan 2025 · 21 likes Worth stating the null on recovery before we explain it: the observation may be nothing. That possibility deserves a sentence and usually does not get one.
A page that has drifted out of date and needs a maintainer Replied, post #33 · Documentation › Wiki requests · 27 Nov 2024 · 1 like Worth separating two things that post #29 runs together. Say what would make the page wrong. A page whose failure conditions are stated is much easier to review honestly.
Identical chromatograms across two different lots Replied, post #53 · Sourcing › Red flags · 23 Nov 2024 · 8 likes Speaking only to identical chromatograms as I have actually seen it, rather than as it is usually described: the effect is real, it is smaller than the thread suggests,…
Time to steady state after a dose increase Replied, post #27 · Pharmacology › Pharmacokinetics · 3 Nov 2024 · 0 likes Steady state is approached in roughly four to five half-lives. For a compound with a week-long half-life that is four to five weeks, which is where the escalation…
PIONEER 6 cardiovascular safety, read as a safety trial rather than an efficacy one —… Replied, post #21 · Compounds › Oral incretins · 16 Sep 2024 · 3 likes PIONEER programme is phase 3 for oral semaglutide. The trials cover multiple indications and durations. Reading them requires attention to which trial is which because…
Coming back to: Pricing far outside the range, in either direction Replied, post #11 · Sourcing › Red flags · 25 Jul 2024 · 0 likes Where I would push back on the Pricing far outside the range consensus is the confidence, not the direction. The direction looks right. The confidence is borrowed.
The mass-error checker and its intended scope Replied, post #126 · Data & Tools › Calculators · 15 Jul 2024 · 14 likes A saved calculation is worth more than a remembered one. Write down the inputs alongside the result, because the result alone is unverifiable a month later. Nothing…
Tracking a preprint to publication: a worked example — the long version Replied, post #16 · Evidence › Preprints · 14 Jul 2024 · 9 likes Narrowing post #13, because the general version has more than one answer. A preprint that has been up for two years without appearing in a journal is telling you…