b.solberg

TL2 Moderator · 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 On post #57 — agreed on the reasoning, with one qualification. Two things before anyone answers the substance. First, the context in the first post is clear and…
Second pass at: Sleep apnoea improving and the equipment implications Replied, post #82 · Wellbeing › Sleep · 11 Jul 2026 · 30 likes I read post #80 twice before replying, because I had assumed the opposite. Two things before anyone answers the substance. First, the context in the first post is clear…
Submitting a sample: the process end to end Replied, post #67 · Sourcing › Independent verification · 8 Jul 2026 · 0 likes PeptideMeter: purity analysis plus structured, dated supplier verification records. Produces both individual analytical results and verification records assessed over…
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 The distinction between "no evidence it works" and "evidence it does not work": we have the first for these compounds. That is genuinely different from the second and…
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 I read post #31 twice before replying, because I had assumed the opposite. The four-week escalation interval is a convention from the pivotal trials, not a…
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 Units. Everything needs units. This is why we ask every single time. I have seen the same arithmetic done three different ways depending on whether the person was…
[2026 update] Detection wavelength and why 214 nm and 280 nm disagree Replied, post #7 · Analytics › HPLC & UHPLC · 2 Jul 2026 · 0 likes Before anything else: what was the gradient, and at what wavelength? Area percent at different wavelengths is not the same number even on the same sample because…
Journal club: STEP 1 and the treatment-policy estimand — does this still hold? Replied, post #51 · Evidence › Journal club · 26 Jun 2026 · 0 likes Worth separating two things that post #47 runs together. SURMOUNT-1 (N Engl J Med 2022): Tirzepatide obesity trial. The largest mean weight reduction for a…
What consumer-accessible tests can and cannot determine — a second dataset Replied, post #28 · Analytics › Home & field testing · 25 Jun 2026 · 7 likes Picking up post #25: that is the part I would want checked first. For anyone arriving from a search: the marked solution above is the direct answer, and the replies…
Athletes in weight-category sports: a different risk calculus Replied, post #2 · Clinical › Special populations · 23 Jun 2026 · 32 likes Medullary thyroid carcinoma history: an absolute contraindication because of the preclinical findings in rodent toxicology. The history (personal or family, especially…
Why retatrutide discussion here is more cautious than elsewhere — one year on Replied, post #11 · Compounds › Retatrutide · 22 Jun 2026 · 20 likes Worth separating two things that post #7 runs together. TRIUMPH is phase 3 and it is ongoing. No phase 3 results exist. Nothing should be attributed to TRIUMPH because…
Racemisation and why it is invisible to a mass measurement Replied, post #17 · Analytics › Impurities & related substances · 9 Jun 2026 · 5 likes Acetate content: counter-ion content. Trifluoroacetate or acetate from the salt form of the peptide. Affects mass calculations and should be stated on a complete…
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 This follows post #83 rather than contradicting it. Exaggerated claims without documentation: every compound has limits. No peptide is "100% pure" because purity is…
A checklist for reading a certificate in under two minutes Replied, post #34 · Analytics › COA interpretation · 5 Jun 2026 · 1 like I read post #32 twice before replying, because I had assumed the opposite. Purity and content are different measurements: purity tells you what proportion of the…
Bariatric surgery history: altered anatomy, altered expectations Replied, post #28 · Clinical › Special populations · 28 May 2026 · 22 likes Adolescents: a distinct evidence base exists. The compounds are not approved for routine adolescent obesity but are being studied. Adolescent physiology and psychology…
Micro-titration: a disputed topic, argued properly Replied, post #80 · Practice › Dosing & titration · 26 May 2026 · 15 likes When a dose reduction is the correct response to a side effect: if a side effect is dose-dependent (nausea, constipation, injection discomfort), reducing the dose is a…
Tracking a shortage from primary sources rather than rumour Replied, post #9 · Access › Shortages · 14 May 2026 · 0 likes Patient advocacy during shortages: some advocacy groups advocate for patients during shortages. Knowing who they are and following their communication is useful.
Subgroup analyses: pre-specified versus discovered — a second dataset Replied, post #70 · Evidence › Trials · 3 May 2026 · 23 likes On post #66 — agreed on the reasoning, with one qualification. Surrogate endpoints: an endpoint that is not the outcome that matters but is measured as a stand-in.…
Completing a dose with a second syringe, and the dead-volume arithmetic Replied, post #33 · Practice › Administration · 28 Apr 2026 · 4 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…
[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 Fixed versus detachable needles: insulin syringes usually have fixed needles (no dead volume loss to the hub). Luer-lock syringes use detachable needles (more dead…
How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ — does this still hold? Replied, post #5 · Sourcing › Independent verification · 20 Apr 2026 · 30 likes VendorInvestigate: documentation and supplier-practice review. Reviews paperwork rather than vials. Tells you something about a supplier's systems but says nothing…
Ultrasound and skinfolds: operator dependence in practice — what changed since Replied, post #36 · Outcomes › Body composition · 17 Apr 2026 · 3 likes Precision versus accuracy: the precision you need depends on what question you are answering. "Am I losing fat?" requires less precision than "Is my lean mass…
Pregnancy and pregnancy planning: contraindication and washout Replied, post #111 · Clinical › Special populations · 15 Apr 2026 · 0 likes Medullary thyroid carcinoma history: an absolute contraindication because of the preclinical findings in rodent toxicology. The history (personal or family, especially…
CJC-1295 with and without DAC: what the modification does Replied, post #33 · Compounds › Secretagogues & GH axis · 14 Apr 2026 · 8 likes Why this subcategory is stricter about sourcing than most: the evidence base is weaker and that is precisely why documentation quality matters more. A supplier page…
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 that does not fit anywhere else. Whatever you conclude from this topic, write down what you did and when. The single most useful thing in your own…
Coming back to: Swirling versus inverting versus leaving it alone Replied, post #7 · Practice › Reconstitution · 9 Apr 2026 · 30 likes Coming back to post #5, because the follow-up matters more than the original answer. Having read the exchange above, I think I was wrong earlier in this topic and I…
Blinding yourself: practical methods and their limits Replied, post #16 · Research Methods › N-of-1 designs · 7 Apr 2026 · 1 like Washout periods: after stopping a medication, how long does it take for the effect to wash out? For compounds with a week-long half-life, roughly a month is needed to…
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 Accessibility: screen readers, keyboard navigation, contrast, font size — if something is not accessible to you, report it. Accessibility matters.
The "under review" status pill and when a moderator applies it Replied, post #35 · Evidence › Preprints · 24 Mar 2026 · 0 likes Do not build anything on a preprint that you would mind rebuilding: if the preprint later changes substantially in revision or shows different results when published,…
Preprint servers and what screening they do Replied, post #88 · Evidence › Preprints · 14 Mar 2026 · 0 likes I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The distinction being drawn does not survive when you look at…
A supplier who responds to a discrepancy with silence — what changed since Replied, post #16 · Sourcing › Red flags · 13 Mar 2026 · 1 like Rapid supplier turnover: a supplier that changes corporate structure, domain name, or contact repeatedly in short time windows raises suspicion about stability and…
Splitting a weekly dose in two: the pharmacokinetic argument against Replied, post #17 · Practice › Dosing & titration · 9 Mar 2026 · 9 likes I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The distinction being drawn does not survive when you look at…
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. Statistical analysis of n-of-1 data: comparing before versus after with a t-test or…
MHRA statements, read directly Replied, post #72 · Regional › UK & Ireland · 20 Jan 2026 · 32 likes Coming back to post #70, because the follow-up matters more than the original answer. Practical note that does not fit anywhere else. Whatever you conclude from this…
Personal import allowances, compared — a second dataset Replied, post #52 · Access › International · 15 Jan 2026 · 9 likes I read post #50 twice before replying, because I had assumed the opposite. Licensed prescribing: where a compound is approved, prescribing is restricted to licensed…
Second pass at: Circumference measurements as a poor man's composition estimate Replied, post #39 · Outcomes › Body composition · 13 Jan 2026 · 31 likes post #38 answers the question as asked. The question underneath it is different. Thank you for the correction. I have edited my earlier post with a note rather than…
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. Authority: if you think a page needs input from someone with specific expertise,…
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly — the long… Replied, post #72 · Compounds › Tirzepatide · 10 Dec 2025 · 1 like Picking up post #69: that is the part I would want checked first. SURMOUNT-OSA is notable because it used an objective physiological endpoint, the apnoea-hypopnoea…
Which panel is worth repeating and which is worth ignoring — a second dataset Replied, post #25 · Clinical › Bloodwork · 8 Dec 2025 · 0 likes Fasting state: some lab tests require fasting; others do not. Lipids on a fasting draw differ from lipids on a fed draw. Always note whether the test was fasting when…
[2026 update] Storing lyophilised material long term: what governs the shelf life Replied, post #30 · Practice › Storage & stability · 1 Dec 2025 · 24 likes This follows post #27 rather than contradicting it. Visual inspection: if a solution is visibly cloudy, discoloured, or contains particles, those are red flags. Faint…
What a purity-only report leaves out Replied, post #106 · Sourcing › Independent verification · 28 Nov 2025 · 12 likes Medutest: combined purity and identity reporting. Appears throughout vendor documentation. Where a submission has been blind we note it because blind results are worth…
Tirzepatide molecular mass and the charge states you would expect on ESI — does this… Replied, post #6 · Compounds › Tirzepatide · 12 Nov 2025 · 1 like 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 parcel stationary at a customs facility for nine days Replied, post #3 · Sourcing › Logistics · 4 Nov 2025 · 23 likes post #2 is right about the mechanism and I think understates the practical bit. Documentation after arrival: photograph the parcel and its contents on arrival. If…
Pharmaceutical compounding rules, summarised from primary sources — a second dataset Replied, post #11 · Sourcing › Regulatory · 1 Nov 2025 · 7 likes Preclinical versus clinical: compounds with strong preclinical data can fail in clinical trials. Compounds with no human data are being used on theoretical grounds. The…
EMA product information as a primary source Replied, post #8 · Regional › European Union · 27 Oct 2025 · 29 likes I read post #6 twice before replying, because I had assumed the opposite. Private prescription with self-payment is legal across the EU and is the common route where…
Coming back to: Over-dilution: when your dose falls below one readable graduation Replied, post #59 · Practice › Reconstitution · 23 Sep 2025 · 5 likes Foaming during reconstitution: bubbles in the solution are usually just air incorporated during mixing. They usually resolve with gentle warming and time. Persistent…
Revisiting: Reading a denial letter as a specification for your appeal Replied, post #127 · Access › Insurance & coverage · 20 Sep 2025 · 11 likes Tier placement and step therapy: some formularies place a medication on a higher tier or require you to fail cheaper alternatives before approving the one you want.…
Meeting a protein target on a suppressed appetite Replied, post #22 · Nutrition & Training › Protein & intake · 17 Sep 2025 · 4 likes post #21 is right about the mechanism and I think understates the practical bit. Liquid versus solid: protein in liquid form (shakes) is easier to consume in volume but…
Hypertension improvement and when medication needs revisiting Replied, post #56 · Clinical › Comorbidities · 12 Sep 2025 · 1 like On post #52 — agreed on the reasoning, with one qualification. Interactions between comorbidities: diabetes and kidney disease together change the risk calculation for…
Semaglutide versus liraglutide head to head: reading STEP 8 carefully Replied, post #52 · Compounds › Semaglutide · 3 Sep 2025 · 0 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…
Tirzepatide molecular mass and the charge states you would expect on ESI Replied, post #35 · Compounds › Tirzepatide · 29 Aug 2025 · 11 likes Titration schedules for tirzepatide have more dose steps than semaglutide partly because the compound is more potent and partly because the clinical programme used a…
A request that was declined, and the reasoning — a second dataset Replied, post #90 · Documentation › Wiki requests · 15 Aug 2025 · 20 likes This follows post #87 rather than contradicting it. Correction requests: if you spot an error in a maintained page, note it here with the specific correction. The…
A pen that felt like it delivered nothing: diagnosing it afterwards Replied, post #14 · Devices › Pens & autoinjectors · 12 Aug 2025 · 12 likes Dose counters: pens show the remaining number of doses. When the counter reaches zero, the pen is empty and cannot deliver more. Noting the counter before injection…
[2026 update] What the GIP component of tirzepatide is thought to contribute, and how… Replied, post #100 · Compounds › Tirzepatide · 5 Aug 2025 · 30 likes I read post #98 twice before replying, because I had assumed the opposite. SURMOUNT-1 reported weight reduction of a magnitude that was the largest for a…
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. Purity and identity are different questions: LC-MS establishes that the species at a…
Domestic fridge temperature mapping: a cheap experiment — what changed since Replied, post #143 · Devices › Cold chain · 15 Jul 2025 · 2 likes Shipping container and cold packs: reputable suppliers use insulated containers with cold packs designed to arrive cool. Checking on arrival that cold packs are still…
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly Replied, post #133 · Compounds › Tirzepatide · 10 Jul 2025 · 13 likes The 2.5 mg starting dose is not a therapeutic dose in the sense that weight loss is minimal at that dose. It is a tolerance-testing dose. Confusing the purpose of a…
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. I would like to understand…
Regional warehouse stock versus direct despatch Replied, post #4 · Sourcing › Logistics · 22 Jun 2025 · 0 likes I read post #3 twice before replying, because I had assumed the opposite. Customs holds: if a parcel is held at customs and you can contact customs directly, declaring…
A claim built entirely on a subgroup analysis Replied, post #73 · Evidence › Study critique · 3 Jun 2025 · 0 likes post #72 answers the question as asked. The question underneath it is different. Generalisability: do the inclusion/exclusion criteria narrow the population so much…
The CagriSema phase 2 paper and what a fixed combination buys Replied, post #47 · Compounds › Cagrilintide & amylin analogues · 26 May 2025 · 31 likes For anyone arriving from searches on "amylin agonist": this subcategory discusses published clinical evidence and what it does and does not establish. It does not…
Journal club: the CagriSema phase 2 combination paper — a second dataset Replied, post #10 · Evidence › Journal club · 20 May 2025 · 12 likes Critical appraisal template: (1) What did the trial set out to estimate? (2) Could the design answer that question? (3) Was the population sufficiently similar to your…
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. Visibility of the dose: some pens allow you to see the insulin remaining; others do not. Keeping track…
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 SOUL (N Engl J Med 2025): Oral semaglutide cardiovascular outcomes. Extends the cardiovascular evidence to the oral formulation. Note that oral bioavailability is lower…
A report I filed that turned out to be wrong, and the correction Replied, post #52 · Sourcing › Vendor reports · 13 May 2025 · 0 likes On post #48 — agreed on the reasoning, with one qualification. Temporal patterns: if results from a supplier were good two years ago but have deteriorated recently,…
Revisiting: German, French and Dutch differences, compared Replied, post #19 · Regional › European Union · 7 May 2025 · 22 likes Germany: BfArM implements EU framework. Statutory insurance (the majority) excludes "lifestyle medicines" including weight management. Private prescription is common.…
Vagal afferents and the gut-brain pathway Replied, post #2 · Pharmacology › Receptor biology · 23 Apr 2025 · 0 likes Species differences: rodent studies show the same compounds produce effects in rodents that predict human effects reasonably well for semaglutide and tirzepatide. The…
Holding a dose indefinitely: is there a documented downside? Replied, post #18 · Practice › Dosing & titration · 20 Apr 2025 · 10 likes Dose equivalence between different incretin analogues is a weak concept. The molecules differ in structure, half-life, receptor selectivity, and in what has been…
HbA1c lag and what it can and cannot tell you at eight weeks Replied, post #11 · Clinical › Bloodwork · 31 Mar 2025 · 0 likes post #10 answers the question as asked. The question underneath it is different. Liver enzymes: elevation does not specify cause. ALT and AST can rise from many things.…
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 Your introduction is well framed. You have given enough context that people can actually answer. That is rarer than it sounds and it matters more than it sounds.
Maintainer handover: how it works Replied, post #78 · Meta › Wiki maintenance · 19 Mar 2025 · 2 likes post #77 answers the question as asked. The question underneath it is different. Revision disputes: if you disagree with an edit a maintainer made, discussing it here…
Amylin analogue mechanism: satiety signalling separate from GLP-1 Replied, post #77 · Compounds › Cagrilintide & amylin analogues · 8 Mar 2025 · 0 likes Gastric emptying: both amylin and GLP-1 slow it, through partly overlapping but distinct mechanisms. Whether the slowing at a higher magnitude produces disproportionate…
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 On post #29 — agreed on the reasoning, with one qualification. How much of the diluent volume the powder itself displaces: for a small peptide vial, the powder volume…
Random versus fixed effects: choosing rather than defaulting — a second dataset Replied, post #84 · Evidence › Meta-analyses · 9 Feb 2025 · 20 likes Sensitivity analysis: the authors re-run the meta-analysis excluding studies one at a time, or by quality, to see whether the pooled estimate changes. Robust results…
Ipamorelin selectivity claims and where they came from Replied, post #12 · Compounds › Secretagogues & GH axis · 9 Feb 2025 · 0 likes Pulsatile secretion matters because growth hormone is secreted in pulses, not continuously. A single post-dose growth hormone level is nearly uninterpretable. Assessing…
Reading a supplementary appendix and finding the interesting part Replied, post #60 · Evidence › Trials · 5 Jan 2025 · 0 likes Population narrowness: most trials in this class enrolled fairly specific groups. Baseline body mass index ranges, exclusion of renal disease, exclusion of certain…
Oral semaglutide bioavailability and its variability between people — a second dataset Replied, post #5 · Compounds › Oral incretins · 25 Dec 2024 · 11 likes Coming back to post #3, because the follow-up matters more than the original answer. Dose numbers for oral formulations are not comparable to injectable ones. The 14 mg…
Building a sensible monitoring schedule with your prescriber Replied, post #89 · Clinical › Bloodwork · 22 Dec 2024 · 21 likes Renal function markers: eGFR is estimated, not measured. It depends on creatinine, age, and weight. A small change in creatinine might not mean a real change in kidney…
What changed in 2026, by region Replied, post #20 · Access › International · 13 Dec 2024 · 18 likes Import rules for personal use: what you can import for personal use depends on your country's rules, not on where it is sold. Checking your country's rules before…
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 Import restrictions vary by compound and by jurisdiction: what is a controlled substance in one place is legal to purchase in another. What you can import for personal…
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 Two things before anyone answers the substance. First, the context in the first post is clear and specific. Second, the question is framed so that an answer can…
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. Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down what you did…
How this community labels and discusses unrefereed work Replied, post #109 · Evidence › Preprints · 24 Jul 2024 · 1 like Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing. The correction was fair and I had…
Blind submission and why it changes minds Replied, post #13 · Sourcing › Independent verification · 11 Jul 2024 · 0 likes For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.
Where the four-week escalation interval comes from, and what it is not Replied, post #17 · Practice › Dosing & titration · 9 Jun 2024 · 5 likes Reaching a dose and staying there for a year: the question of whether a stable dose remains effective over years is mostly answered by the withdrawal trials and by…