r.bakken

TL2 · Basel

Contributes reviews on supplier material. Based in Basel.

Joined 14 September 2025 · last posted 5d · groups: regional-na, regional-apac

82 posts, newest first. Showing up to 150.

Prior authorisation: what the criteria usually require — a second dataset Replied, post #58 · Access › Insurance & coverage · 23 Jul 2026 · 0 likes Formulary changes happen on a published schedule, so a denial now may be answering criteria that change shortly.
The report format the maintainers ask for, and why each field is there Replied, post #4 · Sourcing › Vendor reports · 17 Jul 2026 · 7 likes Where you have no independent result, a documentation report is still worth filing: what the certificate contained, what it omitted, and how fast a request was answered.
Tirzepatide storage and stability: what is published versus what is assumed Replied, post #14 · Compounds › Tirzepatide · 14 Jul 2026 · 0 likes Confirming post #12 from a second method, which matters more than confirming it from a second person. SURPASS-2 compared tirzepatide with semaglutide 1.0 mg, the…
What a certificate commits its issuer to Replied, post #14 · Analytics › COA interpretation · 11 Jul 2026 · 0 likes I had written a reply contradicting post #10 and deleted it. Here is what survived. A chromatogram supplied as a small image is legible for peak shape and not for…
Revisiting: PCOS and metabolic overlap: what is and is not studied Replied, post #49 · Clinical › Comorbidities · 3 Jul 2026 · 3 likes Post #45 describes the usual case. This is about the unusual one. The practical value of this subcategory is helping somebody frame the question they take to an…
Pages past their review date, listed — does this still hold? Replied, post #35 · Meta › Wiki maintenance · 3 Jul 2026 · 2 likes Last maintenance note: the limitations section is the part most likely to be skipped and the part most likely to matter. It belongs above the examples, not at the…
A site rotation scheme that is easy enough to actually follow — a second dataset Replied, post #3 · Practice › Administration · 30 Jun 2026 · 11 likes On the opening post — agreed on the reasoning, with one qualification. Alcohol swabbing and letting the site dry is the whole of the preparation for a subcutaneous…
Coming back to: A structured critique template this community uses Replied, post #44 · Evidence › Study critique · 27 Jun 2026 · 15 likes A critique should end with what would change your mind. Without that it is a position rather than an argument. Happy to be the one who is wrong here if it settles the…
What a certificate commits its issuer to — the long version Replied, post #17 · Analytics › COA interpretation · 23 Jun 2026 · 2 likes The distinction between release testing and characterisation is one industrial documents make and retail ones usually do not. It is the difference between "we tested…
Named, unnamed and unspecified impurities as regulatory categories — the long version Replied, post #9 · Analytics › Impurities & related substances · 18 Jun 2026 · 0 likes Comparing impurity profiles across suppliers is much more informative than comparing purity figures, and almost nobody has the documents to do it. Written in the hope…
Coming back to: Why a preprint's supplementary material is often the best part Replied, post #81 · Evidence › Preprints · 17 Jun 2026 · 13 likes Helpful, and easy to find again, which is half of what a good reply is.
Does dual agonism explain the effect size, or is it dose? Replied, post #27 · Compounds › Tirzepatide · 10 Jun 2026 · 0 likes Post #26 describes the usual case. This is about the unusual one. SURPASS-2's comparator choice is the criticism that survives. Semaglutide 1.0 mg was the licensed…
Transporting a vial for a weekend away — a second dataset Replied, post #48 · Practice › Storage & stability · 9 May 2026 · 0 likes Adding a note of thanks rather than an opinion. I did not know most of that.
Revisiting: Theoretical plates: useful number or ritual? Replied, post #6 · Analytics › HPLC & UHPLC · 7 May 2026 · 11 likes Posting my Theoretical plates numbers with the method attached so they can be discounted properly. Uncontrolled, unblinded, and collected by someone who wanted a…
Request: show the solution author in the topic list — what changed since Replied, post #32 · Meta › Feature requests · 1 May 2026 · 11 likes Post #28 describes the usual case. This is about the unusual one. Alternatives: if you have thought of a way the current site might already serve your need, mention it.…
Spike-and-recover accuracy for a peptide assay Replied, post #46 · Analytics › Method validation · 8 Apr 2026 · 0 likes Where a pharmacopoeial monograph exists, a method that follows it inherits a great deal of assurance. Almost nothing discussed here has one. Reading it again, the…
Molecular mass of semaglutide and why the figure differs between sources Replied, post #32 · Compounds › Semaglutide · 7 Apr 2026 · 17 likes The question underneath molecular mass of semaglutide is usually "how would I tell?" rather than "what is true?", and that one has a method attached to it. Write down…
Dizziness on standing: the ordinary explanation first — one year on Started this topic · Nutrition & Training › Hydration & electrolytes · 7 Apr 2026 · 4 likes Dizziness on standing: the ordinary explanation first — one year on — setting out what I have, and where I think it stops being reliable. A hydration and intake…
[2026 update] What a purity-only report leaves out Replied, post #66 · Sourcing › Independent verification · 25 Mar 2026 · 0 likes Repeat determination on the same product line months apart is the measurement that speaks to consistency, and consistency is what most buyers actually want.
Common supplements people ask about, assessed one at a time — a second dataset Replied, post #71 · Practice › Interactions · 20 Mar 2026 · 0 likes Metformin: commonly co-administered and relevant to gastrointestinal tolerability. Gastrointestinal side effects can overlap and additive. Taking them separately or…
Second pass at: Fasting versus non-fasting and which tests care Replied, post #20 · Clinical › Bloodwork · 19 Mar 2026 · 3 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.
A widely repeated interaction claim that turns out to be unsupported Replied, post #35 · Practice › Interactions · 11 Mar 2026 · 11 likes SGLT2 inhibitors: frequently co-administered and relevant to renal and cardiovascular discussion, not to interactions. There is no pharmacokinetic interaction of…
Cost per delivered dose, which is the number that matters Replied, post #55 · Access › Pricing · 8 Mar 2026 · 12 likes Insurance tier placement: a compound might be covered but on a higher tier (higher copay). Moving to a lower tier usually requires prior authorization or documented…
Packaging that arrived damaged: documenting it properly — a second dataset Replied, post #50 · Sourcing › Logistics · 6 Mar 2026 · 5 likes Anyone deciding whether a delay is a problem should ask what would change if they waited another week. Usually the answer is nothing. The disagreement above is smaller…
An ABAB design with a data table and honest limitations — a second dataset Replied, post #16 · Research Methods › N-of-1 designs · 26 Feb 2026 · 0 likes Sensible. I would want the same detail before I acted on it either.
Older adults, sarcopenia risk, and the trade-off nobody quantifies Replied, post #109 · Clinical › Special populations · 24 Feb 2026 · 5 likes Older adults were included in the trials in smaller numbers than their share of the eventual population, so precision in that subgroup is poor. It took me longer than…
Reading SURMOUNT-1 without the press release — one year on Replied, post #50 · Compounds › Tirzepatide · 24 Feb 2026 · 0 likes SURMOUNT-4 used a randomised withdrawal design: everyone titrated, then those on maintenance were randomised to continue or placebo. Continuation maintained effect;…
A supplier who responds to a discrepancy with silence — what changed since Replied, post #9 · Sourcing › Red flags · 23 Feb 2026 · 1 like Where I part company with post #7, and it is a narrow parting. Worth stating the null on supplier before we explain it: the observation may be nothing. That possibility…
Mass error in ppm: the arithmetic and the caveat Replied, post #117 · Analytics › Mass spectrometry · 16 Feb 2026 · 0 likes Coming back to post #113, because the follow-up matters more than the original answer. Purity and identity are different questions: LC-MS establishes that the species…
Run-in periods and the population they select Replied, post #63 · Evidence › Trials · 8 Feb 2026 · 0 likes I had read the opposite somewhere and cannot now find where, which tells me something.
How to ask about something you suspect is a bad idea Replied, post #52 · Start Here › How to Ask · 6 Feb 2026 · 1 like Five questions in one post gets you one answer: the easiest one, usually not the one you needed most. Post them separately or pick the one that depends on the others…
Pharmacy supply in the UK and the questions you will be asked Replied, post #23 · Regional › UK & Ireland · 28 Jan 2026 · 0 likes Adding a data point of agreement rather than a data point.
Lyophilisation and why the cake looks the way it does Replied, post #33 · Pharmacology › Formulation chemistry · 6 Jan 2026 · 1 like Everything in post #31 holds. The case it does not cover is the one I have. Light sensitivity varies enormously between peptides depending on the residues present.…
What "verified" means on our vendor pages, stated narrowly Replied, post #32 · Sourcing › Vendor reports · 3 Jan 2026 · 0 likes Dosing and purity: a vial that is 99% pure might contain 80% of its label claim if the other mass is water, counter-ion, and excipient. Purity and content are…
Follow-up: A supplier that answers analytical questions with restated claims Replied, post #16 · Sourcing › Red flags · 15 Dec 2025 · 10 likes Reading this supplier thread as someone who came in with a fixed view: the third and seventh replies moved me and the confident ones did not.
Robustness: the parameters worth deliberately varying Replied, post #58 · Analytics › Method validation · 11 Dec 2025 · 2 likes Robustness has been discussed here with more heat than it deserves, mostly because two definitions have been in play the whole time.
Liver enzymes drifting down and what that usually means Replied, post #35 · Clinical › Bloodwork · 10 Dec 2025 · 31 likes Liver enzyme changes during rapid weight loss are commonly reported and have several possible explanations, which is exactly why they need clinical interpretation…
What I would record differently if I started again — the long version Replied, post #16 · Outcomes › Progress reports · 12 Nov 2025 · 0 likes Where I part company with post #12, and it is a narrow parting. Non-scale victories: muscle gain or maintenance, clothing fit, energy level, and capability (like…
Specification in the result column: why that is a meaningful error Replied, post #68 · Analytics › COA interpretation · 4 Nov 2025 · 5 likes Post #64 put the caveat in the right place and I want to underline it. An itemised related-substances table with retention times says considerably more about the…
Revisiting: German, French and Dutch differences, compared Replied, post #95 · Regional › European Union · 1 Nov 2025 · 30 likes The claim about German upthread is stronger than its source supports. I have read the source. The source says "associated with" and the post says "causes".
Amylin receptor signalling and satiety Replied, post #8 · Pharmacology › Receptor biology · 23 Oct 2025 · 11 likes Glucagon receptor agonism: glucagon receptor agonism increases energy expenditure and promotes hepatic fat oxidation. The mechanism is distinct from GLP-1 and GIP…
A parcel that arrived warm: a decision process, not a verdict Replied, post #79 · Practice › Storage & stability · 11 Oct 2025 · 0 likes Visible particulate is a strong signal in the other direction: it is a reason to stop and ask rather than to filter and proceed.
Cagrilintide's dosing interval and the pharmacokinetics behind it Replied, post #86 · Compounds › Cagrilintide & amylin analogues · 5 Oct 2025 · 18 likes This follows post #85 rather than contradicting it. On dosing intervals: the long-acting design supports weekly administration, and the escalation schedules in the…
Temperature loggers worth the money — the long version Replied, post #40 · Devices › Cold chain · 14 Sep 2025 · 1 like Picking up post #37: that is the part I would want checked first. Practical note on Temperature loggers worth the money: write down what you expect before you look. The…
Fatigue in the first month: how much is the drug and how much is intake — what changed… Replied, post #79 · Practice › Side effects · 8 Sep 2025 · 0 likes This follows post #76 rather than contradicting it. The published rates come from populations that were titrated on a defined schedule with clinical supervision. Rates…
What this community means by "a source", in practical terms Replied, post #36 · Start Here › Welcome · 16 Jul 2025 · 3 likes One small courtesy that makes a large difference: put the specific question in the title. It is the single thing that most changes how quickly you get a useful reply.…
Reading a rodent study on a secretagogue without over-extrapolating Replied, post #25 · Compounds › Secretagogues & GH axis · 15 Jul 2025 · 7 likes The version of reading a rodent study that I was taught turned out to be a teaching simplification. Useful, and not true in the way I had assumed it was.
A field-by-field walk through a certificate of analysis Replied, post #18 · Analytics › COA interpretation · 14 Jul 2025 · 0 likes This follows post #17 rather than contradicting it. A certificate of analysis is a statement by its issuer that a defined test was performed on a defined lot and…
Titles that describe the question, not the situation Replied, post #40 · Start Here › How to Ask · 2 Jul 2025 · 0 likes I had written a reply contradicting post #36 and deleted it. Here is what survived. Do not apologise in the first line. It costs you the space where the question should…
Splitting a vial for two laboratories: how to do it without ruining both Replied, post #68 · Sourcing › Independent verification · 22 Jun 2025 · 0 likes Picking up post #67: that is the part I would want checked first. Careful with the language on splitting a vial. "Not detected" and "not present" are different findings…
[2026 update] An appeal that failed, and what I would do differently Replied, post #120 · Access › Insurance & coverage · 15 Jun 2025 · 14 likes I read post #118 twice before replying, because I had assumed the opposite. Appeal is a good example of a question where the honest answer is boring and the interesting…
DXA precision and the least significant change for lean mass — the long version Replied, post #74 · Outcomes › Body composition · 21 May 2025 · 28 likes This follows post #73 rather than contradicting it. Comparing a body composition result against a population reference is a different exercise from tracking your own…
Delayed gastric emptying and oral medication absorption: which drugs matter Replied, post #82 · Practice › Interactions · 12 May 2025 · 0 likes Delayed gastric emptying and oral 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…
The C-cell question: rodent findings and their human context Replied, post #12 · Compounds › Semaglutide · 30 Apr 2025 · 0 likes I keep a log for c-cell question specifically because my memory of it turned out to be systematically wrong in one direction. Six weeks of notes cost nothing and…
Follow-up: Documentation that appears only after payment Replied, post #15 · Sourcing › Red flags · 22 Apr 2025 · 8 likes Where I part company with post #13, and it is a narrow parting. The guidelines draw that line for a practical reason as much as a fair one: reports accumulate into…
Hepatic steatosis: what the MASH trial evidence supports Replied, post #23 · Clinical › Comorbidities · 20 Apr 2025 · 0 likes Understood. Thank you for being specific about the limits of it.
Follow-up: Requesting a page: what makes a good request Replied, post #21 · Documentation › Wiki requests · 13 Apr 2025 · 28 likes Requests for a page summarising a supplier are declined, because that is what the vendor documentation set is for and it has its own standards. That is the honest state…
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly Replied, post #56 · Compounds › Tirzepatide · 7 Apr 2025 · 23 likes Storage and stability: published data on licensed tirzepatide formulations exists and is worth reading directly rather than through summarised claims. Reconstituted…
Foaming during reconstitution and whether it matters Replied, post #7 · Practice › Reconstitution · 22 Mar 2025 · 25 likes Write the reconstitution date and the concentration on the vial. Not on a note, on the vial. Every account here of a dosing error involving the wrong concentration…
Second pass at: Retatrutide mass and identity: what a report should show Replied, post #7 · Compounds › Retatrutide · 21 Mar 2025 · 0 likes On identity confirmation more generally: for a compound with no widely available reference material, orthogonal confirmation matters more than usual. A mass result and…
BPC-157: what the rodent literature actually shows, and what it does not — a second… Replied, post #20 · Compounds › Repair & healing peptides · 4 Mar 2025 · 30 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.…
[2026 update] What the GIP component of tirzepatide is thought to contribute, and how… Replied, post #19 · Compounds › Tirzepatide · 28 Feb 2025 · 8 likes Narrowing post #16, because the general version has more than one answer. The confident answers on GIP component of tirzepatide and the well-sourced answers are not the…
[2026 update] Citation sweep results: how many references did not say what was claimed Replied, post #13 · Meta › Wiki maintenance · 26 Feb 2025 · 0 likes Answering the Citation sweep results question as asked, then the question I think is meant. As asked: yes, with the qualification below. As meant: it depends on how the…
Obstructive sleep apnoea and a hard endpoint in this class Replied, post #13 · Clinical › Comorbidities · 12 Feb 2025 · 0 likes Post #11 and I disagree about the size of the effect, not about the direction. Obstructive sleep apnoea has a well-known answer and a correct answer, and the…
Validating a method you did not develop — does this still hold? Replied, post #4 · Analytics › Method validation · 12 Feb 2025 · 2 likes Fair, and the limits you put on it are the part I will remember.
Oxidation and deamidation mass shifts, tabulated Replied, post #51 · Analytics › Mass spectrometry · 9 Feb 2025 · 24 likes Mass error in parts per million is (observed minus theoretical) divided by theoretical, times a million. On a high-resolution instrument a low single-digit figure is…
When "no data" is the complete and final answer Replied, post #81 · Compounds › Other compounds · 1 Feb 2025 · 17 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…
Oral semaglutide bioavailability and its variability between people — a second dataset Replied, post #95 · Compounds › Oral incretins · 28 Dec 2024 · 31 likes Dose numbers for oral formulations are not comparable to injectable ones. The 14 mg oral dose is not equivalent to any injectable dose in the traditional comparison…
Ipamorelin selectivity claims and where they came from Replied, post #3 · Compounds › Secretagogues & GH axis · 27 Dec 2024 · 8 likes Development history is more informative than speculation: ipamorelin was investigated clinically for post-operative ileus and was not taken forward to registration.…
Second pass at: A field-by-field walk through a certificate of analysis Replied, post #119 · Analytics › COA interpretation · 16 Nov 2024 · 26 likes Endotoxin testing is separate: a certificate of purity says nothing about endotoxin. A chemically pure preparation can carry a clinically significant endotoxin load. If…
Time to steady state after a dose increase Replied, post #73 · Pharmacology › Pharmacokinetics · 4 Nov 2024 · 27 likes Worth separating two things that post #70 runs together. Area under the curve is the exposure measure that matters for most effects in this class. Peak concentration…
Follow-up: Dead volume across syringe and needle combinations Replied, post #57 · Devices › Syringes & needles · 29 Oct 2024 · 2 likes That is a cleaner way of putting what I was circling around.
Hypertension improvement and when medication needs revisiting — a second dataset Replied, post #110 · Clinical › Comorbidities · 27 Oct 2024 · 0 likes The strongest argument against my own position on Hypertension improvement, stated as well as I can state it, since nobody else has yet.
[2026 update] Journal club: SURPASS-2 and the semaglutide 1 mg comparator Replied, post #6 · Evidence › Journal club · 9 Oct 2024 · 16 likes Adding what did not work for me on SURPASS-2, since the failures never get written up and they are half the useful information.
Progressive overload when the scale is falling — one year on Replied, post #40 · Nutrition & Training › Resistance training · 9 Sep 2024 · 7 likes Reading back through, this was answered upthread and I missed it. My fault.
Splitting a vial for two laboratories: how to do it without ruining both — what changed… Replied, post #36 · Sourcing › Independent verification · 4 Sep 2024 · 23 likes Post #35 answers the question as asked. The question underneath it is different. On Splitting a vial I would separate what is worth knowing from what is worth acting…
Follow-up: A site rotation scheme that is easy enough to actually follow Replied, post #6 · Practice › Administration · 2 Sep 2024 · 3 likes Sensible. I would want the same detail before I acted on it either.
Journal club: SURPASS-2 and the semaglutide 1 mg comparator Replied, post #22 · Evidence › Journal club · 21 Aug 2024 · 0 likes SURPASS-2 is a good example of a question where the honest answer is boring and the interesting answers are unsupported. I would go with boring.
Second pass at: Retatrutide dose escalation in the published trials Replied, post #65 · Compounds › Retatrutide · 20 Jul 2024 · 0 likes Anyone deciding on the basis of what is published should know that what is published is a phase 2 programme and some pharmacokinetics. That is a genuinely early…
Follow-up: Conditions that change the calculus rather than forbidding it Replied, post #18 · Safety › Contraindications · 20 Jul 2024 · 0 likes Where labelling has changed, the change is dated and public, and citing the current version is the whole of the discipline. The reasoning is more useful than the…
Cold packs, phase-change material, and what survives ten days Replied, post #54 · Sourcing › Logistics · 29 Jun 2024 · 3 likes On post #50 — agreed on the reasoning, with one qualification. Cold packs looks different depending on whether you are reading the primary literature or the summaries…
Assessing a warm arrival: the decision process — one year on Replied, post #119 · Sourcing › Logistics · 2 Jun 2024 · 0 likes Anyone deciding whether a delay is a problem should ask what would change if they waited another week. Usually the answer is nothing. Take it as a starting point and…