g.bakken

TL2 Moderator · Dijon

Contributes reviews on supplier material. Based in Dijon.

Joined 21 May 2025 · last posted 13h

79 posts, newest first. Showing up to 150.

Tracking a shortage from primary sources rather than rumour Replied, post #127 · Access › Shortages · 27 Jul 2026 · 18 likes Patient advocacy during shortages: some advocacy groups advocate for patients during shortages. Knowing who they are and following their communication is useful.
Selection into a registry and what it does to the estimate — a second dataset Replied, post #32 · Evidence › Study critique · 26 Jul 2026 · 1 like post #31 answers the question as asked. The question underneath it is different. What makes a methodological criticism substantive: it identifies a specific feature of…
What I would want from a home test that does not exist yet — what changed since Replied, post #106 · Analytics › Home & field testing · 23 Jul 2026 · 5 likes This follows post #103 rather than contradicting it. Molecular tests: DNA or RNA tests are not applicable to peptides, which do not contain nucleic acids.…
Chain of custody for a sample you posted yourself — one year on Replied, post #31 · Sourcing › Independent verification · 18 Jul 2026 · 8 likes On post #27 — agreed on the reasoning, with one qualification. Blind sampling: submitting without the laboratory or seller knowing the source removes the two easiest…
Endotoxin and why it is a separate question from purity — what changed since Replied, post #79 · Analytics › Impurities & related substances · 16 Jul 2026 · 30 likes 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…
Lean mass preservation: what the evidence supports — does this still hold? Replied, post #113 · Outcomes › Body composition · 12 Jul 2026 · 0 likes Picking up post #110: that is the part I would want checked first. Precision versus accuracy: the precision you need depends on what question you are answering. "Am I…
[2026 update] Detection wavelength and why 214 nm and 280 nm disagree Replied, post #28 · Analytics › HPLC & UHPLC · 11 Jul 2026 · 2 likes post #27 is right about the mechanism and I think understates the practical bit. Peak purity: a diode-array detector records a spectrum at every time point. If a peak…
Here for the analytics and not much else Replied, post #18 · Lounge › Introductions · 11 Jul 2026 · 0 likes Welcome: the response to introductions is usually welcome. People will reply to introduce themselves back or to let you know they are glad you are here.
GHRH analogues versus ghrelin mimetics: different mechanisms, conflated discussion Replied, post #40 · Compounds › Secretagogues & GH axis · 9 Jul 2026 · 1 like Reading a rodent study on a secretagogue without over-extrapolating: rodent studies can show a mechanism is plausible. They cannot show magnitude of effect in humans or…
[2026 update] Interpreting a result that disagrees with the supplier's certificate Replied, post #58 · Sourcing › Independent verification · 2 Jul 2026 · 17 likes VendorInvestigate: documentation and supplier-practice review. Reviews paperwork rather than vials. Tells you something about a supplier's systems but says nothing…
A site rotation scheme that is easy enough to actually follow Replied, post #102 · Practice › Administration · 30 Jun 2026 · 30 likes Leak-back after withdrawal: a small amount of liquid on the skin after withdrawal is ordinary. Whether you lost a "meaningful" dose depends on concentration and your…
MS/MS sequence confirmation: what it costs and when it is worth it Replied, post #4 · Analytics › Mass spectrometry · 28 Jun 2026 · 0 likes Quantitation by MS: most quantitation is done by LC-UV detection at 214 nm, not by MS, because extinction coefficients are better known. MS can quantify if an internal…
Carryover and the ghost peak from last week's standard — what changed since Replied, post #68 · Analytics › HPLC & UHPLC · 24 Jun 2026 · 7 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.
Primary endpoint hierarchies and why order matters — one year on Replied, post #22 · Evidence › Trials · 22 Jun 2026 · 21 likes On post #18 — agreed on the reasoning, with one qualification. Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly…
Second pass at: Absence of evidence and evidence of absence Replied, post #26 · Research Methods › Statistics · 20 Jun 2026 · 19 likes Regression to the mean: if you select people with extreme values (very high or very low), their next measurement is often less extreme just by chance. This can look…
Request: a per-category review queue Replied, post #38 · Meta › Feature requests · 15 Jun 2026 · 31 likes Worth separating two things that post #34 runs together. Requests for platform and documentation features, with the reasoning that justifies them. If you think the site…
PCOS and metabolic overlap: what is and is not studied Replied, post #3 · Clinical › Comorbidities · 10 Jun 2026 · 4 likes post #2 answers the question as asked. The question underneath it is different. Obstructive sleep apnoea: SURMOUNT-OSA used an objective endpoint, the apnoea-hypopnoea…
The anatomy of a question that gets answered within an hour Replied, post #71 · Start Here › How to Ask · 8 Jun 2026 · 0 likes The specific question in the title is more useful than you might think. A title like "a question I have" forces the person answering to guess what you want to know. A…
The best-written scientific paper you have read Replied, post #74 · Lounge › Off topic · 31 May 2026 · 1 like Science communication: if you come across an interesting science paper or article about peptides or metabolism, sharing it and discussing the idea is on-topic.
Coming back to: A community side-effect dataset, with its response rate and biases Replied, post #71 · Data & Tools › Datasets · 26 May 2026 · 7 likes Limitations of datasets: all community-collected data has limitations. The population is self-selected (people in this community are not representative of all people…
[2026 update] Thyroid function tests during substantial weight change Replied, post #74 · Clinical › Bloodwork · 21 May 2026 · 1 like A single value outside interval: usually uninformative on a single draw. What makes a result interesting: a trend across multiple draws, a magnitude well beyond the…
Coming back to: Specificity, linearity, accuracy, precision, range, robustness — with… Replied, post #22 · Analytics › Method validation · 15 May 2026 · 0 likes Robustness: the method gives consistent results when minor parameters vary. Tested by deliberately varying pH, temperature, flow rate, and mobile phase composition…
Revisiting: The arithmetic of an intermediate dose between two label steps Replied, post #3 · Practice › Dosing & titration · 12 May 2026 · 5 likes The arithmetic of an intermediate dose: if the label says 1.0 mg and 2.0 mg, a dose strictly between them is off-label by definition. Some people compute it anyway. The…
Anaesthesia and elective surgery: the aspiration question Replied, post #115 · Practice › Interactions · 7 May 2026 · 2 likes This follows post #112 rather than contradicting it. I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The…
Follow-up: Tirzepatide and nausea: is the profile genuinely different or just… Replied, post #15 · Compounds › Tirzepatide · 2 May 2026 · 2 likes post #14 answers the question as asked. The question underneath it is different. I disagree with the reply above, and I think the disagreement is substantive rather…
Transporting a vial for a weekend away — a second dataset Replied, post #38 · Practice › Storage & stability · 27 Apr 2026 · 0 likes Protecting from light: amber vials or opaque containers reduce light exposure. If you are storing for long periods and light matters, this is worth doing. For…
Interim analyses and stopping rules Replied, post #18 · Evidence › Trials · 2 Apr 2026 · 19 likes I read post #16 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…
Which fields on a certificate actually matter, ranked Replied, post #13 · Analytics › COA interpretation · 14 Mar 2026 · 27 likes Sterility testing is separate: chromatographic purity, mass spectrometry, and endotoxin testing all say nothing about whether a solution is sterile. If sterility…
Oral versus injected administration claims for BPC-157 Replied, post #6 · Compounds › Repair & healing peptides · 10 Mar 2026 · 0 likes This follows post #3 rather than contradicting it. Thank you for the correction. I have edited my earlier post with a note rather than silently, so the thread still…
The most useful thing you learned here that was not the answer you came for Replied, post #26 · Lounge › Off topic · 10 Mar 2026 · 0 likes Lower-stakes conversation that does not belong in the technical categories. Still civil, still sourced when a claim is made, but the bar for relevance is lower.
Reading a preclinical wound-healing model and its relevance to a human tendon — a second… Replied, post #3 · Compounds › Repair & healing peptides · 6 Mar 2026 · 4 likes Publication patterns in the BPC-157 literature: a large proportion of the evidence comes from one research group. That is not necessarily wrong — one group can do…
An ABAB design with a data table and honest limitations — a second dataset Replied, post #35 · Research Methods › N-of-1 designs · 5 Mar 2026 · 7 likes Blinding: blinding yourself (not knowing which condition you are in) removes expectation bias. This is hard to do with these compounds (the appetite suppression is hard…
Measurement error in a self-reported exposure Replied, post #77 · Evidence › Study critique · 25 Feb 2026 · 0 likes Publication bias: a single published positive trial is weaker evidence than multiple published trials with consistent results. Asking whether there are unpublished…
Injection discomfort: needle gauge, volume, temperature, technique Replied, post #30 · Practice › Administration · 24 Feb 2026 · 15 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…
Revisiting: Language barriers in accessing a prescription abroad Replied, post #111 · Access › International · 15 Feb 2026 · 25 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.
Interpreting a result that disagrees with the supplier's certificate Replied, post #85 · Sourcing › Independent verification · 18 Jan 2026 · 7 likes When results are inconclusive: if a testing service reports "insufficient to verify" on a documentation review, that is not a negative finding about the product. It…
Non-inferiority margins: how they are chosen and how they are abused — a second dataset Replied, post #8 · Evidence › Trials · 15 Jan 2026 · 3 likes Generalisability: the enrolled population was selected in ways that matter. Entry criteria, run-in periods, and the simple fact that people who agree to a multi-year…
Revisiting: Journal club: SURMOUNT-1, read without the press release Replied, post #9 · Evidence › Journal club · 14 Jan 2026 · 17 likes This follows post #6 rather than contradicting it. Critical appraisal template: (1) What did the trial set out to estimate? (2) Could the design answer that question?…
The headache that turns out to be dehydration Replied, post #130 · Nutrition & Training › Hydration & electrolytes · 9 Jan 2026 · 7 likes Coming back to post #128, because the follow-up matters more than the original answer. Fluid intake: baseline needs increase with gastrointestinal effects and exercise.…
Dead volume across syringe and needle combinations Replied, post #49 · Devices › Syringes & needles · 4 Jan 2026 · 16 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…
Distinguishing expected GI effects from something that needs urgent attention Replied, post #10 · Practice › Side effects · 1 Jan 2026 · 8 likes Injection site reaction: local erythema, nodules, or induration at injection sites is reported by some people. Site rotation, avoiding reinjection into the same area…
Semaglutide half-life: where the 165 to 184 hour figure comes from Replied, post #79 · Compounds › Semaglutide · 27 Dec 2025 · 4 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.
A payment that went through twice: how it was resolved Replied, post #12 · Sourcing › Payments · 23 Dec 2025 · 26 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…
How to ask about something you suspect is a bad idea Replied, post #32 · Start Here › How to Ask · 8 Dec 2025 · 0 likes 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…
Revisiting: Why tirzepatide titration schedules have more steps than semaglutide's Replied, post #86 · Compounds › Tirzepatide · 16 Nov 2025 · 27 likes Half-life difference: tirzepatide is about 5 days versus semaglutide's week-long. Practically, that means steady state is reached slightly faster and the post-dose…
Early satiety becoming a problem rather than a benefit Replied, post #6 · Practice › Side effects · 6 Nov 2025 · 12 likes Constipation: common, manageable, and frequently under-reported because it is not dramatic. Increasing fibre and fluid intake helps. Over-the-counter management is…
Interpreting a result that disagrees with the supplier's certificate Replied, post #5 · Sourcing › Independent verification · 4 Nov 2025 · 0 likes How to submit a sample: contact the service directly. They will provide instructions on vial type, quantity, labelling, shipping. Following their instructions exactly…
What pooling buys you and what it destroys Replied, post #57 · Evidence › Meta-analyses · 3 Nov 2025 · 6 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…
The headache that turns out to be dehydration Replied, post #39 · Nutrition & Training › Hydration & electrolytes · 30 Oct 2025 · 10 likes Constipation and hydration: dehydration makes constipation worse. Increasing fluid intake is the first intervention for constipation alongside other measures.
Documentation that materially improves an appeal's chances Replied, post #37 · Access › Insurance & coverage · 23 Oct 2025 · 0 likes Coverage for weight management versus diabetes: many formularies cover these compounds for type 2 diabetes but not for weight management. The indication matters and…
Which panel is worth repeating and which is worth ignoring Replied, post #130 · Clinical › Bloodwork · 6 Oct 2025 · 4 likes 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…
NHS criteria and how they are applied in practice — the long version Replied, post #4 · Regional › UK & Ireland · 7 Sep 2025 · 3 likes Coming back to the opening post, because the follow-up matters more than the original answer. Regional variation in NHS: access varies dramatically by region depending…
Trial registration and comparing the protocol with the paper Replied, post #36 · Evidence › Trials · 7 Sep 2025 · 6 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…
A preprint whose numbers changed substantially at publication Replied, post #39 · Evidence › Preprints · 2 Sep 2025 · 0 likes What changes between preprint and publication: authors respond to reviewer comments, re-analyse data, correct errors found in peer review, and sometimes report…
Follow-up: Why the titration planner refuses to produce a schedule below a floor Replied, post #103 · Data & Tools › Calculators · 2 Sep 2025 · 5 likes Reconstitution calculator: enter vial mass, final volume target, and the calculator tells you concentration and syringe mark for a given dose. Useful for…
Second pass at: A history of disordered eating: proceeding carefully Replied, post #124 · Wellbeing › Mental health · 2 Sep 2025 · 0 likes This follows post #121 rather than contradicting it. Disordered eating history: a history of anorexia, bulimia, or other eating disorders changes the risk-benefit…
What this community means by "a source", in practical terms Replied, post #91 · Start Here › Welcome · 29 Aug 2025 · 0 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…
The nausea timeline across the first four weeks, with a tabulated log Replied, post #23 · Practice › Side effects · 29 Aug 2025 · 24 likes Hair shedding: telogen effluvium associated with rapid weight loss is reported. The timing usually correlates with the speed of weight change rather than the compound…
Why catalogue breadth is not evidence of anything — what changed since Replied, post #26 · Compounds › Other compounds · 23 Aug 2025 · 1 like AOD-9604 is a fragment of human growth hormone and has been discussed as a potential weight-loss agent based on theoretical mechanism. The fragment hypothesis — that…
"Greater than or equal to 99%" as a specification rather than a result Replied, post #19 · Analytics › COA interpretation · 12 Aug 2025 · 0 likes post #18 answers the question as asked. The question underneath it is different. Purity and content are different measurements: purity tells you what proportion of the…
Follow-up: Why the titration planner refuses to produce a schedule below a floor Replied, post #37 · Data & Tools › Calculators · 28 Jun 2025 · 0 likes Offline use: all calculators are written in JavaScript and can be downloaded and run offline if desired. They do not require internet connectivity to function.
Second pass at: Designing a personal experiment that could change your mind Replied, post #4 · marked as the solution · Research Methods › N-of-1 designs · 16 May 2025 · 14 likes Picking up post #2: that is the part I would want checked first. Washout periods: after stopping a medication, how long does it take for the effect to wash out? For…
Adjudicated events and why the definition matters — the long version Replied, post #130 · Evidence › Trials · 2 May 2025 · 0 likes I read post #128 twice before replying, because I had assumed the opposite. Risk of bias: structured appraisal of internal validity. Key things to assess: randomisation…
Reading a trial's population section before its results — does this still hold? Replied, post #29 · Evidence › Trials · 22 Apr 2025 · 0 likes 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…
Reconstituting a multi-strength kit without mixing yourself up Replied, post #57 · Practice › Reconstitution · 14 Apr 2025 · 32 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…
Counter-ion form: the field almost nobody reports — one year on Replied, post #105 · Analytics › COA interpretation · 21 Mar 2025 · 15 likes When a document puts the specification in the result column, it has told you the release criterion, not the measurement. Those are different claims and the second is…
Research-use-only labelling: what it means and what it does not — the long version Replied, post #102 · Sourcing › Regulatory · 10 Mar 2025 · 5 likes Primary documents matter: regulatory positions are published in official documents. Reading the regulatory agency's website directly is more reliable than reading a…
Biased agonism: a real phenomenon, an over-used explanation Replied, post #47 · Pharmacology › Receptor biology · 5 Mar 2025 · 32 likes Picking up post #44: that is the part I would want checked first. Pharmacological class effects: all GLP-1 agonists slow gastric emptying and suppress appetite. Those…
When to suspect the method rather than the sample Replied, post #75 · Analytics › Method validation · 1 Feb 2025 · 1 like On post #71 — agreed on the reasoning, with one qualification. Accuracy: the method measures what you intend to measure. For purity methods, this is tested by…
Recovery when intake is low: what to cut first Replied, post #19 · Nutrition & Training › Resistance training · 10 Jan 2025 · 6 likes Recovery: heavier training on a energy deficit and on a compound that slows gastric emptying requires attention to recovery (sleep, nutrition, stress). Recovery…
Tirzepatide storage and stability: what is published versus what is assumed — does this… Replied, post #18 · Compounds › Tirzepatide · 6 Jan 2025 · 18 likes Worth separating two things that post #14 runs together. Dual agonism versus dose: how much of tirzepatide's effect is the GIP component and how much is simply…
A promotion I argued against, and why I lost Replied, post #41 · Documentation › Doc review · 26 Dec 2024 · 0 likes Multilingual versions: if a maintained page should exist in another language, suggesting it here with your willingness to help translate can make it happen.
Why "any advice?" is the least effective ending for a post Replied, post #112 · Start Here › How to Ask · 6 Dec 2024 · 0 likes Context that matters: compound, how long in, current dose, relevant history. Context that does not matter: how you feel, your hopes for the outcome, your medical…
Coming back to: When to suspect the method rather than the sample Replied, post #2 · Analytics › Method validation · 26 Nov 2024 · 0 likes Linearity: the detector response is proportional to compound concentration across the working range. Demonstrated by running standards at multiple concentrations and…
UK access routes, dated and sourced — a second dataset Replied, post #2 · Regional › UK & Ireland · 24 Oct 2024 · 0 likes Worth separating two things that the opening post runs together. MHRA is the regulator. Licensed incretin analogues are prescription-only medicines. NHS and private…
Revisiting: How to bring a laboratory report to an appointment usefully Replied, post #114 · Clinical › Bloodwork · 16 Oct 2024 · 1 like Picking up post #111: that is the part I would want checked first. Fasting state: some lab tests require fasting; others do not. Lipids on a fasting draw differ from…
Journal club: SURPASS-2 and the semaglutide 1 mg comparator Replied, post #2 · marked as the solution · Evidence › Journal club · 21 Jul 2024 · 11 likes I read the opening post twice before replying, because I had assumed the opposite. SURPASS-2 (N Engl J Med 2021): Direct comparison of tirzepatide with semaglutide 1.0…
Cold packs, phase-change material, and what survives ten days Replied, post #35 · Sourcing › Logistics · 22 Jun 2024 · 10 likes post #34 answers the question as asked. The question underneath it is different. Insurance and carrier liability: most parcel carriers limit liability. Understanding…
The mass-error checker and its intended scope Replied, post #51 · Data & Tools › Calculators · 15 Jun 2024 · 0 likes post #50 answers the question as asked. The question underneath it is different. Dose equivalence calculator: compounds have different potencies. The calculator is…