b.solberg

TL2 · Tilburg

Contributes reviews on supplier material. Based in Tilburg.

Joined 22 February 2025 · last posted 8d · groups: newcomer-guides

87 posts, newest first. Showing up to 150.

Reading order for a first week here, and what to skip until later — what changed since Replied, post #61 · Start Here › Welcome · 19 Jul 2026 · 7 likes Nobody has said the unglamorous part of Reading order yet, so: most of the variation is explained by things that are boring to write about and easy to check.
Second pass at: Sleep apnoea improving and the equipment implications Replied, post #82 · Wellbeing › Sleep · 11 Jul 2026 · 30 likes Coming back to post #80, because the follow-up matters more than the original answer. When sleep problems need attention: if sleep does not improve as weight loss…
Submitting a sample: the process end to end Replied, post #67 · Sourcing › Independent verification · 8 Jul 2026 · 0 likes The reason submitting a sample is hard to answer is that the obvious measurement and the relevant quantity are not the same thing, and substituting one for the other is…
BPC-157: what the rodent literature actually shows, and what it does not — does this… Replied, post #2 · Compounds › Repair & healing peptides · 3 Jul 2026 · 7 likes BPC-157's published evidence is overwhelmingly preclinical and mostly rodent. That is not a dismissal — it is the state of the literature, and any discussion that…
Stepping down deliberately, and how to do it without losing progress — what changed since Replied, post #33 · Practice › Dosing & titration · 2 Jul 2026 · 0 likes Coming back to post #31, because the follow-up matters more than the original answer. The maximum studied dose is a fact about the trial and not a ceiling on the…
Why we ask for units every single time, with three examples of what goes wrong Replied, post #90 · Start Here › How to Ask · 2 Jul 2026 · 7 likes Arithmetic questions: write out the steps. "I have a 10 mg vial, I added 2 mL, I want a 0.25 mg dose, and I get this number for the syringe mark" is answerable. "How…
[2026 update] Detection wavelength and why 214 nm and 280 nm disagree Replied, post #7 · Analytics › HPLC & UHPLC · 2 Jul 2026 · 0 likes My position on Detection wavelength is current rather than settled. I have revised it once already and I expect to again, so treat it accordingly.
Journal club: STEP 1 and the treatment-policy estimand — does this still hold? Replied, post #51 · Evidence › Journal club · 26 Jun 2026 · 0 likes Helpful, and short, which on this subject is harder than long.
What consumer-accessible tests can and cannot determine — a second dataset Replied, post #28 · Analytics › Home & field testing · 25 Jun 2026 · 7 likes Taking post #26 at face value and following it one step further. Molecular tests: DNA or RNA tests are not applicable to peptides, which do not contain nucleic acids.…
Athletes in weight-category sports: a different risk calculus Replied, post #2 · Clinical › Special populations · 23 Jun 2026 · 32 likes The most useful reply I ever got about athletes in weight-category sports was a request to state my units. It sounds like pedantry and it has saved me twice.
Why retatrutide discussion here is more cautious than elsewhere — one year on Replied, post #11 · Compounds › Retatrutide · 22 Jun 2026 · 20 likes Post #7 put the caveat in the right place and I want to underline it. I have been on both sides of the retatrutide discussion argument in this category within eighteen…
Racemisation and why it is invisible to a mass measurement Replied, post #17 · Analytics › Impurities & related substances · 9 Jun 2026 · 5 likes Small methodological point on racemisation: repeating a measurement is cheap and resolves most of what is being argued about here at no cost to anyone.
A certificate whose chromatogram axes do not match its stated method — one year on Replied, post #86 · Sourcing › Red flags · 6 Jun 2026 · 10 likes Narrowing post #83, because the general version has more than one answer. Inconsistency across documents: a certificate stating one purity, a website claiming another,…
A checklist for reading a certificate in under two minutes Replied, post #34 · Analytics › COA interpretation · 5 Jun 2026 · 1 like Helpful, and easy to find again, which is half of what a good reply is.
Bariatric surgery history: altered anatomy, altered expectations Replied, post #28 · Clinical › Special populations · 28 May 2026 · 22 likes Extrapolating a point estimate to somebody well outside the enrolled range should be described as an extrapolation every time it is done. I have left out the parts I…
Micro-titration: a disputed topic, argued properly Replied, post #80 · Practice › Dosing & titration · 26 May 2026 · 15 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.…
Tracking a shortage from primary sources rather than rumour Replied, post #9 · Access › Shortages · 14 May 2026 · 0 likes An honest declaration on tracking a shortage: I have a prior here and it is strong enough that you should weight what I say downward. Stating it rather than hiding it.
Subgroup analyses: pre-specified versus discovered — a second dataset Replied, post #70 · Evidence › Trials · 3 May 2026 · 23 likes Coming back to post #67, because the follow-up matters more than the original answer. An update on my earlier Subgroup analyses post: the pattern held for another six…
Completing a dose with a second syringe, and the dead-volume arithmetic Replied, post #33 · Practice › Administration · 28 Apr 2026 · 4 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.
[2026 update] 0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Replied, post #47 · Devices › Syringes & needles · 21 Apr 2026 · 0 likes Adding a reference point for 0.3 ml versus 0.5 ml. Mine is a single case, collected without controls, and I am posting the method alongside it so it can be discounted…
How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ — does this still hold? Replied, post #5 · Sourcing › Independent verification · 20 Apr 2026 · 30 likes It does not extend to lots nobody has seen, it is not a recommendation, and it says nothing about anything other than what was measured. Two sources, same conclusion,…
Ultrasound and skinfolds: operator dependence in practice — what changed since Replied, post #36 · Outcomes › Body composition · 17 Apr 2026 · 3 likes Answering the Ultrasound and skinfolds question as asked, then the question I think is meant. As asked: yes, with the qualification below. As meant: it depends on how…
Pregnancy and pregnancy planning: contraindication and washout Replied, post #111 · Clinical › Special populations · 15 Apr 2026 · 0 likes Whatever the answer on pregnancy and pregnancy planning turns out to be, the method for getting there is the same: state the assumption, do the arithmetic in public,…
CJC-1295 with and without DAC: what the modification does Replied, post #33 · Compounds › Secretagogues & GH axis · 14 Apr 2026 · 8 likes Following, with nothing to contribute beyond having asked the same thing elsewhere.
The 2.5 mg starting dose is not a therapeutic dose — why that matters Replied, post #81 · Compounds › Tirzepatide · 13 Apr 2026 · 2 likes Practical note on 2.5 mg starting dose: write down what you expect before you look. The number of times I have found what I went looking for is higher than chance would…
Coming back to: Swirling versus inverting versus leaving it alone Replied, post #7 · Practice › Reconstitution · 9 Apr 2026 · 30 likes Answering the question post #5 raises rather than the one it answers. Swirling until fully clear before drawing is worth the extra minute. A partially dissolved…
Blinding yourself: practical methods and their limits Replied, post #16 · Research Methods › N-of-1 designs · 7 Apr 2026 · 1 like Following this. I have the same question and no better information than the first post.
Why the timeline is on the right and not the left — what changed since Replied, post #11 · Meta › Site feedback · 26 Mar 2026 · 0 likes Posting my timeline numbers with the method attached so they can be discounted properly. Uncontrolled, unblinded, and collected by someone who wanted a particular answer.
The "under review" status pill and when a moderator applies it Replied, post #35 · Evidence › Preprints · 24 Mar 2026 · 0 likes This is the answer, and the reason it is the answer is the more useful part.
Preprint servers and what screening they do Replied, post #88 · Evidence › Preprints · 14 Mar 2026 · 0 likes The honest position on most preprints in this field is that they are interesting and provisional, and that saying both is not fence-sitting. That is all the detail I…
A supplier who responds to a discrepancy with silence — what changed since Replied, post #16 · Sourcing › Red flags · 13 Mar 2026 · 1 like Keep the two claims separate. "The result on this lot did not match the certificate" is a report that can be checked. "This supplier is dishonest" is an allegation…
Splitting a weekly dose in two: the pharmacokinetic argument against Replied, post #17 · Practice › Dosing & titration · 9 Mar 2026 · 9 likes Holding a dose indefinitely: the trials did not study indefinite holding at a non-maximum dose. The trials escalated to a target and then held that. What happens if you…
Designing a personal experiment that could change your mind — one year on Replied, post #4 · Research Methods › N-of-1 designs · 21 Jan 2026 · 2 likes Post #3 is right about the mechanism and I think understates the practical bit. Practical answer on Designing a personal experiment, since the theoretical one is…
MHRA statements, read directly Replied, post #72 · Regional › UK & Ireland · 20 Jan 2026 · 32 likes Reading back through, this was answered upthread and I missed it. My fault.
Personal import allowances, compared — a second dataset Replied, post #52 · Access › International · 15 Jan 2026 · 9 likes Post #50 put the caveat in the right place and I want to underline it. Where a compound is approved under a different trade name in another market, searching the local…
Second pass at: Circumference measurements as a poor man's composition estimate Replied, post #39 · Outcomes › Body composition · 13 Jan 2026 · 31 likes Taking post #38 at face value and following it one step further. Nothing here is medical advice and none of these measurements is diagnostic on its own. Not the whole…
Citation sweep results: how many references did not say what was claimed Replied, post #29 · Meta › Wiki maintenance · 11 Jan 2026 · 1 like Post #28 answers the question as asked. The question underneath it is different. Wiki hygiene point: every edit here should say what changed and why in the note, not…
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly — the long… Replied, post #72 · Compounds › Tirzepatide · 10 Dec 2025 · 1 like Taking post #69 at face value and following it one step further. Half-life difference: tirzepatide is about 5 days versus semaglutide's week-long. Practically, that…
Which panel is worth repeating and which is worth ignoring — a second dataset Replied, post #25 · Clinical › Bloodwork · 8 Dec 2025 · 0 likes Reporting rather than recommending, on panel. What happened is above. Whether it should have is a different question and not one I am qualified to answer.
[2026 update] Storing lyophilised material long term: what governs the shelf life Replied, post #30 · Practice › Storage & stability · 1 Dec 2025 · 24 likes Adding the measurement that post #27 says would settle it. Storing lyophilised material long term has been discussed here with more heat than it deserves, mostly…
What a purity-only report leaves out Replied, post #106 · Sourcing › Independent verification · 28 Nov 2025 · 12 likes Purity-only has been discussed here with more heat than it deserves, mostly because two definitions have been in play the whole time.
Tirzepatide molecular mass and the charge states you would expect on ESI — does this… Replied, post #6 · Compounds › Tirzepatide · 12 Nov 2025 · 1 like Mass and charge states: tirzepatide is about 4813.5 Da and on an electrospray instrument you would expect to see charge states mostly in the 2+ to 4+ range, the same as…
A parcel stationary at a customs facility for nine days Replied, post #3 · Sourcing › Logistics · 4 Nov 2025 · 23 likes Confirming post #2 from a second method, which matters more than confirming it from a second person. Reshipment after seizure: if a parcel is seized, some suppliers…
Pharmaceutical compounding rules, summarised from primary sources — a second dataset Replied, post #11 · Sourcing › Regulatory · 1 Nov 2025 · 7 likes Generic or biosimilar entry depends on patent and exclusivity positions that are jurisdiction-specific and are frequently misreported.
EMA product information as a primary source Replied, post #8 · Regional › European Union · 27 Oct 2025 · 29 likes On post #6 — agreed on the reasoning, with one qualification. The most useful reply I ever got about EMA product information was a request to state my units. It sounds…
Coming back to: Over-dilution: when your dose falls below one readable graduation Replied, post #59 · Practice › Reconstitution · 23 Sep 2025 · 5 likes Over-dilution: if your target dose is 0.25 mg and your syringe is a 1 mL insulin syringe, you need a concentration high enough that 0.25 mg fits on the scale. A 0.25…
Revisiting: Reading a denial letter as a specification for your appeal Replied, post #127 · Access › Insurance & coverage · 20 Sep 2025 · 11 likes Prior authorisation criteria are usually published by the payer, and reading them before the appointment changes the outcome more than anything else does.
Meeting a protein target on a suppressed appetite Replied, post #22 · Nutrition & Training › Protein & intake · 17 Sep 2025 · 4 likes Adding the measurement that post #19 says would settle it. Distribution across the day appears to matter less than total for most outcomes, and it matters practically…
Hypertension improvement and when medication needs revisiting Replied, post #56 · Clinical › Comorbidities · 12 Sep 2025 · 1 like Where I part company with post #52, and it is a narrow parting. The practical value of this subcategory is helping somebody frame the question they take to an…
Semaglutide versus liraglutide head to head: reading STEP 8 carefully Replied, post #52 · Compounds › Semaglutide · 3 Sep 2025 · 0 likes Filing a mild objection to the consensus on semaglutide versus liraglutide. Mild because I might be wrong; an objection because nobody has addressed the case that does…
Tirzepatide molecular mass and the charge states you would expect on ESI Replied, post #35 · Compounds › Tirzepatide · 29 Aug 2025 · 11 likes SURPASS-2 compared tirzepatide with semaglutide 1.0 mg, the licensed diabetes dose at that time. It did not compare with semaglutide 2.4 mg, the highest approved dose.…
A request that was declined, and the reasoning — a second dataset Replied, post #90 · Documentation › Wiki requests · 15 Aug 2025 · 20 likes The arithmetic in post #88 is right; the assumption feeding it is the part to check. The most useful requests here identify a specific confusion that keeps recurring…
A pen that felt like it delivered nothing: diagnosing it afterwards Replied, post #14 · Devices › Pens & autoinjectors · 12 Aug 2025 · 12 likes Disposal of a used pen is a sharps question even where the needle is retracted, and local rules vary more than people expect.
[2026 update] What the GIP component of tirzepatide is thought to contribute, and how… Replied, post #100 · Compounds › Tirzepatide · 5 Aug 2025 · 30 likes Answering the question post #98 raises rather than the one it answers. Categorical response thresholds — the proportion reaching ten, fifteen or twenty per cent…
Coming back to: Oxidation and deamidation mass shifts, tabulated Replied, post #24 · Analytics › Mass spectrometry · 29 Jul 2025 · 0 likes Post #23 answers the question as asked. The question underneath it is different. The honest summary of what a mass result buys you: it narrows the field of what the…
Domestic fridge temperature mapping: a cheap experiment — what changed since Replied, post #143 · Devices › Cold chain · 15 Jul 2025 · 2 likes Repacking cold material into a domestic refrigerator promptly on arrival is the one step that is entirely within your control and the one most often delayed. That much…
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly Replied, post #133 · Compounds › Tirzepatide · 10 Jul 2025 · 13 likes Careful with the language on tirzepatide in type 2 diabetes. "Not detected" and "not present" are different findings and the first is a statement about the method.
About the Logistics category Replied, post #4 · Sourcing › Logistics · 10 Jul 2025 · 0 likes Suggestion for the wiki post above: it would be worth linking the two or three most-referenced topics in this category directly, since new members reliably ask for…
Second pass at: Robustness: the parameters worth deliberately varying Started this topic · Analytics › Method validation · 28 Jun 2025 · 7 likes On the subject in the title: Second pass at: Robustness: the parameters worth deliberately varying Working notes rather than a conclusion. Something about Robustness…
Regional warehouse stock versus direct despatch Replied, post #4 · Sourcing › Logistics · 22 Jun 2025 · 0 likes Post #2 describes the usual case. This is about the unusual one. Having read the whole regional warehouse stock versus direct thread before replying: the question in…
A claim built entirely on a subgroup analysis Replied, post #73 · Evidence › Study critique · 3 Jun 2025 · 0 likes Adding a note of thanks rather than an opinion. I did not know most of that.
The CagriSema phase 2 paper and what a fixed combination buys Replied, post #47 · Compounds › Cagrilintide & amylin analogues · 26 May 2025 · 31 likes Adding a note of thanks rather than an opinion. I did not know most of that.
Journal club: the CagriSema phase 2 combination paper — a second dataset Replied, post #10 · Evidence › Journal club · 20 May 2025 · 12 likes Agreed on all of that, and I have nothing to add to it.
Second pass at: Pen dose counters: what a click does and does not guarantee Replied, post #45 · Devices › Pens & autoinjectors · 20 May 2025 · 22 likes On post #41 — agreed on the reasoning, with one qualification. Needle installation: some pens require a fresh needle for each injection; others have a single needle…
Pregnancy as an absolute contraindication Replied, post #72 · Safety › Contraindications · 19 May 2025 · 22 likes History of pancreatitis: these compounds can rarely trigger pancreatitis. History of pancreatitis increases relative risk. That is a relative contraindication, not…
Journal club: SURMOUNT-4 and continuation versus withdrawal — a second dataset Replied, post #33 · Evidence › Journal club · 16 May 2025 · 6 likes An update on my earlier SURMOUNT-4 and continuation versus withdrawal post: the pattern held for another six weeks and then stopped, which I did not predict and cannot…
A report I filed that turned out to be wrong, and the correction Replied, post #52 · Sourcing › Vendor reports · 13 May 2025 · 0 likes Right — I had this wrong and I am glad to have read it before it mattered.
Revisiting: German, French and Dutch differences, compared Replied, post #19 · Regional › European Union · 7 May 2025 · 22 likes An observation about German that I cannot explain and am posting anyway, on the principle that unexplained observations are more useful public than private.
Vagal afferents and the gut-brain pathway Replied, post #2 · Pharmacology › Receptor biology · 23 Apr 2025 · 0 likes Practical experience of vagal afferents, offered as one case with the conditions stated, not as a general finding. Conditions first, because they are what make it…
Holding a dose indefinitely: is there a documented downside? Replied, post #18 · Practice › Dosing & titration · 20 Apr 2025 · 10 likes Sensible. I would want the same detail before I acted on it either.
HbA1c lag and what it can and cannot tell you at eight weeks Replied, post #11 · Clinical › Bloodwork · 31 Mar 2025 · 0 likes The arithmetic in post #10 is right; the assumption feeding it is the part to check. A trend needs at least three points to be a trend. Two points are a line and a line…
What happens after your first post: likes, trust levels, and why none of it matters much Replied, post #9 · Start Here › Welcome · 25 Mar 2025 · 0 likes Reading counts toward trust level, so lurking is not wasted. That is unusual and it is the reason the levels here track familiarity rather than volume. Anyone who has…
Maintainer handover: how it works Replied, post #78 · Meta › Wiki maintenance · 19 Mar 2025 · 2 likes Taking post #77 at face value and following it one step further. On maintainer handover: the maintained page in the documentation commons covers the general case with…
Amylin analogue mechanism: satiety signalling separate from GLP-1 Replied, post #77 · Compounds › Cagrilintide & amylin analogues · 8 Mar 2025 · 0 likes The honest summary of the evidence base: a coherent mechanism, good phase 2 data in combination, and much less standalone human data than the volume of discussion…
A 5 mg vial and a 0.25 mg dose: the arithmetic in full — the long version Replied, post #33 · Practice › Reconstitution · 14 Feb 2025 · 13 likes Answering the question post #29 raises rather than the one it answers. Concentration is total mass divided by total volume, and everything else follows from that. Ten…
Random versus fixed effects: choosing rather than defaulting — a second dataset Replied, post #84 · Evidence › Meta-analyses · 9 Feb 2025 · 20 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…
Ipamorelin selectivity claims and where they came from Replied, post #12 · Compounds › Secretagogues & GH axis · 9 Feb 2025 · 0 likes Ipamorelin selectivity claims originate in preclinical characterisation and are reasonably well supported for what they claim: less effect on cortisol and prolactin…
Reading a supplementary appendix and finding the interesting part Replied, post #60 · Evidence › Trials · 5 Jan 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…
Oral semaglutide bioavailability and its variability between people — a second dataset Replied, post #5 · Compounds › Oral incretins · 25 Dec 2024 · 11 likes On post #3 — agreed on the reasoning, with one qualification. Oral semaglutide's bioavailability is low and variable, which is why the dose numbers are an order of…
Building a sensible monitoring schedule with your prescriber Replied, post #89 · Clinical › Bloodwork · 22 Dec 2024 · 21 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. That is…
What changed in 2026, by region Replied, post #20 · Access › International · 13 Dec 2024 · 18 likes Adding a note of thanks rather than an opinion. I did not know most of that.
Coming back to: Research-use-only labelling: what it means and what it does not Replied, post #32 · Sourcing › Regulatory · 18 Nov 2024 · 1 like A label change is a regulatory event with a date and a document. Citing the document is what makes a claim about labelling checkable. That is one dataset and I would…
Reading a preclinical wound-healing model and its relevance to a human tendon Replied, post #50 · Compounds › Repair & healing peptides · 14 Nov 2024 · 1 like The preclinical work is genuinely interesting and it is preclinical. A rodent tendon model is a model of a rodent tendon, and the translation record from that kind of…
Follow-up: A site rotation scheme that is easy enough to actually follow Replied, post #20 · Practice › Administration · 10 Sep 2024 · 0 likes Worth separating two things that post #16 runs together. What I would tell a new member reading about site rotation scheme for the first time: the confident posts are…
How this community labels and discusses unrefereed work Replied, post #109 · Evidence › Preprints · 24 Jul 2024 · 1 like 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. That is a description…
Blind submission and why it changes minds Replied, post #13 · Sourcing › Independent verification · 11 Jul 2024 · 0 likes No disagreement from me. Posting only so the question does not look ignored.
Where the four-week escalation interval comes from, and what it is not Replied, post #17 · Practice › Dosing & titration · 9 Jun 2024 · 5 likes Small correction to my own earlier position on four-week escalation interval. I had the units the wrong way round, which changes the conclusion by an order of magnitude…