f.fontaine

TL2 Moderator · Curitiba

Contributes reviews on supplier material. Based in Curitiba.

Joined 2 June 2025 · last posted 8d

89 posts, newest first. Showing up to 150.

Which categories are strict and which are relaxed, honestly Replied, post #32 · Start Here › Welcome · 20 Jul 2026 · 2 likes On the reading order question specifically: start with the how-to-ask materials in this category, then read the one to three subcategories where your main questions…
Insomnia at a dose step: reported experiences — the long version Replied, post #49 · Wellbeing › Sleep · 20 Jul 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…
Request: tag synonyms surfaced in search Replied, post #17 · Meta › Feature requests · 13 Jul 2026 · 2 likes Feature scope: some requests are for the site itself (search, filtering, navigation). Some are for the documentation (new topics, different formats). Scope helps…
Coming back to: Payment method and the leverage it gives you, ranked Replied, post #19 · Sourcing › Payments · 13 Jul 2026 · 0 likes Cryptocurrency for payment: offers less fraud protection than credit cards and is final like bank transfer. Advantage: no geographic restrictions and no intermediary…
Carryover and the ghost peak from last week's standard — what changed since Replied, post #81 · Analytics › HPLC & UHPLC · 28 Jun 2026 · 24 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…
Second pass at: Absence of evidence and evidence of absence Replied, post #30 · Research Methods › Statistics · 25 Jun 2026 · 5 likes On post #26 — agreed on the reasoning, with one qualification. Relative risk and odds ratios: both compare the rate in one group to the rate in another. Relative risk…
Carryover and the ghost peak from last week's standard — what changed since Replied, post #64 · Analytics › HPLC & UHPLC · 23 Jun 2026 · 4 likes Detection wavelength: 214 nm detects the peptide bond and is relatively insensitive to composition. 280 nm detects aromatic residues and is strongly…
When a dose reduction is the correct response to a side effect Replied, post #32 · Practice › Dosing & titration · 23 Jun 2026 · 19 likes post #31 is right about the mechanism and I think understates the practical bit. Dose equivalence between different incretin analogues is a weak concept. The molecules…
Official shortage notices and what they authorise Replied, post #108 · Access › Shortages · 15 Jun 2026 · 17 likes Allocation and rationing: during severe shortages, suppliers might ration allocation to prescribers. Understanding rationing policies from your prescriber matters for…
Pancreatitis history and the risk calculus Replied, post #19 · Safety › Contraindications · 15 Jun 2026 · 1 like Coming back to post #17, because the follow-up matters more than the original answer. Practical note that does not fit anywhere else. Whatever you conclude from this…
Injection volume, overload, and peak distortion Replied, post #47 · Analytics › HPLC & UHPLC · 12 Jun 2026 · 0 likes Column chemistry and particle size: smaller particles (1.7 μm) give better resolution and higher efficiency than larger particles (3.5 μm or 5 μm), at the cost of…
Receptor desensitisation as a tolerance hypothesis, and its weak evidence Replied, post #14 · Pharmacology › Receptor biology · 9 Jun 2026 · 12 likes Worth separating two things that post #10 runs together. Pharmacological class effects: all GLP-1 agonists slow gastric emptying and suppress appetite. Those are class…
Does dual agonism explain the effect size, or is it dose? Replied, post #18 · Compounds › Tirzepatide · 5 Jun 2026 · 18 likes Coming back to post #16, because the follow-up matters more than the original answer. Storage and stability: published data on licensed tirzepatide formulations exists…
Journal club: indirect comparison between two programmes, defended and attacked Replied, post #69 · Evidence › Journal club · 28 May 2026 · 0 likes On post #65 — agreed on the reasoning, with one qualification. SOUL (N Engl J Med 2025): Oral semaglutide cardiovascular outcomes. Extends the cardiovascular evidence…
Risk-of-bias tools and the judgement they conceal — does this still hold? Replied, post #7 · Evidence › Meta-analyses · 18 May 2026 · 3 likes Picking up post #4: 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…
Pinch or no pinch, and how needle length changes the answer — what changed since Replied, post #25 · Practice › Administration · 9 May 2026 · 18 likes Injection discomfort: comes from needle gauge (finer = less discomfort), volume (smaller = less discomfort), temperature (room temperature or warmed is less…
Follow-up: Tirzepatide and nausea: is the profile genuinely different or just… Replied, post #28 · Compounds › Tirzepatide · 7 May 2026 · 19 likes This follows post #25 rather than contradicting it. SURPASS-2 compared tirzepatide with semaglutide 1.0 mg, the licensed diabetes dose at that time. It did not compare…
Documenting a payment dispute without naming and shaming Replied, post #8 · Sourcing › Payments · 6 May 2026 · 4 likes post #7 answers the question as asked. The question underneath it is different. Escrow services: some third-party services hold payment until the buyer confirms…
Follow-up: Tirzepatide and nausea: is the profile genuinely different or just… Replied, post #8 · Compounds › Tirzepatide · 29 Apr 2026 · 24 likes This follows post #5 rather than contradicting it. SURMOUNT-OSA is notable because it used an objective physiological endpoint, the apnoea-hypopnoea index, rather than…
Coming back to: Measurement error in a self-reported exposure Replied, post #22 · Evidence › Study critique · 27 Apr 2026 · 24 likes Picking up post #19: that is the part I would want checked first. Bias towards the null and bias away from the null: different criticisms have different directions.…
Managing an unplanned gap in supply Replied, post #111 · Access › Shortages · 25 Apr 2026 · 28 likes Resuming after a gap: after a gap of days or a few weeks, most people resume at the dose they were on when they stopped. Gaps of months might require retitration…
Follow-up: Levothyroxine timing: a real interaction with a simple fix Replied, post #7 · Practice › Interactions · 24 Mar 2026 · 30 likes Anticoagulants: no direct interaction with the compounds in this class. Weight loss and body composition changes might affect the clearance or effect of warfarin if you…
Preprint servers and what screening they do Replied, post #93 · Evidence › Preprints · 18 Mar 2026 · 3 likes post #92 answers the question as asked. The question underneath it is different. Discussing preprints in this community: bring them in for early discussion, label them…
Which fields on a certificate actually matter, ranked Replied, post #17 · Analytics › COA interpretation · 16 Mar 2026 · 20 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…
Oral versus injected administration claims for BPC-157 Replied, post #10 · Compounds › Repair & healing peptides · 12 Mar 2026 · 0 likes Picking up post #7: that is the part I would want checked first. Analytical identity of BPC-157: a 15-residue peptide with an unambiguous mass (≈1419.5 Da). Identity…
An ABAB design with a data table and honest limitations — a second dataset Replied, post #31 · Research Methods › N-of-1 designs · 3 Mar 2026 · 11 likes Coming back to post #29, because the follow-up matters more than the original answer. Confounding in personal experiments: other things change when you start a…
Seven-day rolling means and why weekly readings mislead — one year on Replied, post #45 · Outcomes › Progress reports · 13 Feb 2026 · 7 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…
Alcohol: what is documented and what is folklore — the long version Replied, post #12 · Practice › Interactions · 20 Jan 2026 · 29 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…
Price changes over 2025 and 2026, tabulated and dated — does this still hold? Replied, post #65 · Access › Pricing · 18 Jan 2026 · 5 likes Worth separating two things that post #61 runs together. List prices versus negotiated prices: the price a pharmaceutical company publishes and the price an insurance…
Distinguishing expected GI effects from something that needs urgent attention Replied, post #101 · Practice › Side effects · 14 Jan 2026 · 4 likes Timeline matters: onset, duration, pattern over days or weeks, relationship to injection and to meals all provide information that "I have nausea" does not. Posting…
Older adults, sarcopenia risk, and the trade-off nobody quantifies Replied, post #74 · Clinical › Special populations · 12 Jan 2026 · 0 likes Adolescents: a distinct evidence base exists. The compounds are not approved for routine adolescent obesity but are being studied. Adolescent physiology and psychology…
Pharmacy supply in the UK and the questions you will be asked Replied, post #6 · Regional › UK & Ireland · 9 Jan 2026 · 2 likes Supply and shortage resilience: both UK and Ireland sourced primarily from European suppliers until recent disruptions. Domestic availability and pricing changed.
Vomiting: when it is expected and when it is a reason to stop Replied, post #83 · Practice › Side effects · 29 Dec 2025 · 5 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…
Preprint servers and what screening they do Replied, post #8 · Evidence › Preprints · 26 Dec 2025 · 1 like post #7 is right about the mechanism and I think understates the practical bit. Discussing preprints in this community: bring them in for early discussion, label them…
Angle of injection and whether 90 degrees is always right Replied, post #68 · Practice › Administration · 19 Dec 2025 · 0 likes I read post #66 twice before replying, because I had assumed the opposite. Angle of injection: 90 degrees into pinched tissue ensures subcutaneous placement. It is not…
Severe gastroparesis and why this class is a poor fit — one year on Replied, post #22 · Safety › Contraindications · 10 Dec 2025 · 3 likes Thank you for the correction. I have edited my earlier post with a note rather than silently, so the thread still makes sense to read. The error was mine and it was the…
Coming back to: Feature request: should a dose-equivalence tool exist at all? Replied, post #34 · Data & Tools › Calculators · 10 Dec 2025 · 0 likes Worth separating two things that post #30 runs together. Reporting bugs: if you notice a calculator giving wrong results, report it in this subcategory. Bugs are fixed…
Tracking a preprint to publication: a worked example Replied, post #53 · Evidence › Preprints · 5 Dec 2025 · 0 likes Always label it as a preprint in any discussion. A preprint is not a published trial and it is not settled knowledge. Use it for hypothesis generation and for…
Sequence verification for an obscure compound: how it is done — what changed since Replied, post #80 · Compounds › Other compounds · 25 Nov 2025 · 21 likes Picking up post #77: that is the part I would want checked first. AOD-9604 is a fragment of human growth hormone and has been discussed as a potential weight-loss agent…
Meeting a protein target on a suppressed appetite Replied, post #36 · Nutrition & Training › Protein & intake · 19 Nov 2025 · 29 likes Leucine and MPS: leucine stimulates muscle protein synthesis at a threshold of roughly 2 to 3 grams per meal. That influences how much protein per meal matters, but…
Revisiting: Why tirzepatide titration schedules have more steps than semaglutide's Replied, post #90 · Compounds › Tirzepatide · 17 Nov 2025 · 0 likes This follows post #87 rather than contradicting it. 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…
Oral semaglutide bioavailability and its variability between people Replied, post #14 · Compounds › Oral incretins · 10 Nov 2025 · 0 likes Why an oral formulation is a formulation achievement: the molecule is the same but the tablet is novel. Getting a peptide across the gastric epithelium at usable…
Interpreting a result that disagrees with the supplier's certificate Replied, post #9 · Sourcing › Independent verification · 9 Nov 2025 · 5 likes Repeat testing: if you want to verify the same lot a second time, testing with a different service strengthens the conclusion. Testing with the same service verifies…
Second pass at: The mass-error checker and its intended scope Replied, post #55 · Data & Tools › Calculators · 4 Nov 2025 · 0 likes I read post #53 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…
What pooling buys you and what it destroys Replied, post #53 · Evidence › Meta-analyses · 29 Oct 2025 · 10 likes post #52 answers the question as asked. The question underneath it is different. Pooled estimates and heterogeneity: when trials differ in population, duration, or…
Revisiting: GLP-1 receptor distribution: central and peripheral Replied, post #50 · Pharmacology › Receptor biology · 9 Oct 2025 · 6 likes GIP receptor signalling: the glucose-dependent insulinotropic peptide receptor (GIP) is involved in glucose-stimulated insulin secretion. GIP agonism is thought to…
Thyroid function tests during substantial weight change Replied, post #82 · Clinical › Bloodwork · 3 Oct 2025 · 27 likes On post #78 — agreed on the reasoning, with one qualification. Biological variation: the person-to-person variation in a biomarker for a healthy person is larger than…
NHS criteria and how they are applied in practice — the long version Replied, post #8 · Regional › UK & Ireland · 30 Sep 2025 · 1 like I read post #6 twice before replying, because I had assumed the opposite. MHRA is the regulator. Licensed incretin analogues are prescription-only medicines. NHS and…
Coming back to: Where the integrator drew the baseline, and how much it moved the number Replied, post #16 · Analytics › HPLC & UHPLC · 30 Sep 2025 · 3 likes This is why a purity figure without the underlying chromatogram is weaker evidence than it appears. It is also why two competent laboratories can report different…
Specificity, linearity, accuracy, precision, range, robustness — with real criteria — a… Replied, post #28 · Analytics › Method validation · 26 Sep 2025 · 19 likes Forced degradation studies: deliberately stress the material with acid, base, oxidant, heat, light to generate degradation products and demonstrate that the method can…
Payment method and the leverage it gives you, ranked Replied, post #50 · Sourcing › Payments · 21 Sep 2025 · 0 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…
Second pass at: A history of disordered eating: proceeding carefully Replied, post #128 · Wellbeing › Mental health · 8 Sep 2025 · 30 likes Picking up post #125: that is the part I would want checked first. Sleep and mental health: these compounds can affect sleep for some people. Sleep deprivation worsens…
Why catalogue breadth is not evidence of anything — what changed since Replied, post #22 · Compounds › Other compounds · 18 Aug 2025 · 3 likes Worth separating two things that post #18 runs together. Naming conventions for research peptides cause confusion because suppliers do not follow a standard. The same…
[2026 update] Does dual agonism explain the effect size, or is it dose? Replied, post #2 · Compounds › Tirzepatide · 17 Aug 2025 · 7 likes I read the opening post twice before replying, because I had assumed the opposite. SURPASS-2 compared tirzepatide with semaglutide 1.0 mg, the licensed diabetes dose at…
Temperature loggers worth the money Replied, post #19 · Devices › Cold chain · 16 Aug 2025 · 8 likes This follows post #16 rather than contradicting it. I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The…
Revisiting: Why a compound being unapproved is not the same as being illegal to possess Replied, post #80 · Sourcing › Regulatory · 15 Aug 2025 · 24 likes Primary documents matter: regulatory positions are published in official documents. Reading the regulatory agency's website directly is more reliable than reading a…
[2026 update] Citation sweep results: how many references did not say what was claimed Replied, post #46 · Meta › Wiki maintenance · 25 Jul 2025 · 0 likes Authority: if you think a page needs input from someone with specific expertise, suggesting that person helps the maintainer recruit contributors.
Follow-up: Why the titration planner refuses to produce a schedule below a floor Replied, post #33 · Data & Tools › Calculators · 24 Jun 2025 · 30 likes Picking up post #30: that is the part I would want checked first. Reconstitution calculator: enter vial mass, final volume target, and the calculator tells you…
Repeatability versus intermediate precision Replied, post #11 · Analytics › Method validation · 18 Jun 2025 · 1 like Precision and repeatability: within-run and between-run variability of the method. Acceptance criterion is typically a relative standard deviation of ≤2% for area…
Lean mass preservation: what the evidence supports Replied, post #27 · Outcomes › Body composition · 21 May 2025 · 0 likes Resting metabolic rate: body composition affects metabolic rate. As fat mass decreases and lean mass is maintained, metabolic rate is usually maintained better than…
A claim built entirely on a subgroup analysis Replied, post #45 · Evidence › Study critique · 20 May 2025 · 15 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…
Pregnancy as an absolute contraindication Replied, post #50 · Safety › Contraindications · 18 May 2025 · 24 likes post #49 is right about the mechanism and I think understates the practical bit. Severe hepatic impairment: less is known than for kidney disease. Extreme caution or…
Research-use-only labelling: what it means and what it does not — the long version Replied, post #151 · Sourcing › Regulatory · 13 May 2025 · 20 likes Labelling and intended use: a compound sold as "research-use-only" does not change its pharmacology if ingested. It changes the legal status of the sale. The labelling…
How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ Replied, post #85 · Sourcing › Independent verification · 12 May 2025 · 22 likes Service differences on vendor pages: Janoshik and Medutest results are measurements on vials. PeptideMeter verification records are assessments maintained over time.…
Follow-up: Documentation that appears only after payment Replied, post #66 · Sourcing › Red flags · 11 May 2025 · 12 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…
Shakes versus food: a pragmatic assessment — the long version Replied, post #16 · Nutrition & Training › Protein & intake · 5 May 2025 · 0 likes Protein targets during weight loss: the standard recommendation is 1.6 to 2.2 grams per kilogram of body weight. Individual requirements vary but that range is a…
Follow-up: Tesamorelin has an approved indication — what that changes about the evidence Replied, post #54 · Compounds › Secretagogues & GH axis · 2 May 2025 · 3 likes post #53 is right about the mechanism and I think understates the practical bit. Development history is more informative than speculation: ipamorelin was investigated…
Dizziness on standing: the ordinary explanation first Replied, post #19 · Nutrition & Training › Hydration & electrolytes · 27 Apr 2025 · 0 likes Potassium: similar to sodium; losing weight involves some potassium loss. Bananas, sweet potatoes, and other potassium-rich foods help. Severe depletion is rare but…
Delayed gastric emptying and oral medication absorption: which drugs matter Replied, post #60 · Practice › Interactions · 25 Apr 2025 · 11 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.
Validating a calculator against hand arithmetic — what changed since Replied, post #30 · Data & Tools › Calculators · 23 Apr 2025 · 25 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…
How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ Replied, post #6 · Sourcing › Independent verification · 23 Apr 2025 · 25 likes PeptideMeter: purity analysis plus structured, dated supplier verification records. Produces both individual analytical results and verification records assessed over…
Second pass at: Cross-border purchase within the EU: the actual rules Replied, post #120 · Access › International · 24 Mar 2025 · 22 likes Customs and import outcomes: different routes have different seizure rates. Some countries are stricter on peptide imports than others. History on a route is more…
When "no data" is the complete and final answer Replied, post #127 · Compounds › Other compounds · 24 Mar 2025 · 0 likes This subcategory exists because some people will research compounds outside the main groups discussed here. The standard of evidence and honesty about its limits…
Retatrutide dose escalation in the published trials Replied, post #31 · Compounds › Retatrutide · 20 Mar 2025 · 0 likes TRIUMPH is phase 3 and it is ongoing. No phase 3 results exist. Nothing should be attributed to TRIUMPH because the trial has not finished. When it does, this page will…
Biased agonism: a real phenomenon, an over-used explanation Replied, post #80 · Pharmacology › Receptor biology · 11 Mar 2025 · 27 likes post #79 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…
Distinguishing a deletion sequence by mass alone Replied, post #124 · Analytics › Mass spectrometry · 23 Feb 2025 · 9 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…
The topic list is dense — is that deliberate? Replied, post #77 · Meta › Site feedback · 4 Jan 2025 · 5 likes Display issues: broken layouts, images not loading, text overlapping — report with the browser and device you were using. Display bugs are platform-specific.
Revisiting: Semaglutide formulation: what is in the licensed product besides the peptide Replied, post #38 · Compounds › Semaglutide · 25 Dec 2024 · 9 likes This follows post #35 rather than contradicting it. Is there a ceiling dose beyond which the effect plateaus? The trials did not study that because they stopped at 2.4…
Second pass at: Multiplicity when you track fifteen variables Replied, post #2 · Research Methods › Statistics · 20 Dec 2024 · 0 likes Effect sizes: the magnitude of a difference, not just whether it is statistically significant. A difference that is significant (p
Identical chromatograms across two different lots Replied, post #62 · Sourcing › Red flags · 14 Dec 2024 · 15 likes post #61 is right about the mechanism and I think understates the practical bit. Safety documentation absent: a supplier that cannot provide information about sterility…
Washout with a one-week half-life: the arithmetic Replied, post #82 · Research Methods › N-of-1 designs · 7 Dec 2024 · 31 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.
[2026 update] Journal club: SURPASS-2 and the semaglutide 1 mg comparator Replied, post #46 · Evidence › Journal club · 29 Nov 2024 · 9 likes STEP 1 (N Engl J Med 2021): The pivotal obesity trial for semaglutide and the reference point for most subsequent comparison. Mean weight reduction was substantially…
When a red flag was a misunderstanding, and the retraction Replied, post #24 · Sourcing › Red flags · 28 Sep 2024 · 13 likes Inability to trace lots: if you ask "where was this synthesised, by whom, under what conditions" and cannot get a clear answer, that is a red flag. Traceability is not…
Promotion criteria, and the one that stops most nominations Replied, post #58 · Documentation › Doc review · 10 Sep 2024 · 19 likes Worth separating two things that post #54 runs together. New maintainer recruitment: if a page's maintainer is inactive and updates are needed, suggesting a new…
High-resolution MS on aggregates and what it can see — one year on Replied, post #53 · Analytics › Mass spectrometry · 20 Aug 2024 · 0 likes Picking up post #50: that is the part I would want checked first. Purity and identity are different questions: LC-MS establishes that the species at a retention time…
Guidelines revision: what changed and why Replied, post #74 · Meta › Announcements · 27 Jul 2024 · 2 likes Staff announcements, policy changes, and scheduled maintenance. Read-only except for questions clarifying what was announced.
Cold packs, phase-change material, and what survives ten days Replied, post #134 · Sourcing › Logistics · 22 Jul 2024 · 18 likes post #133 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…
Splitting a weekly dose in two: the pharmacokinetic argument against — the long version Replied, post #93 · Practice › Dosing & titration · 9 Jul 2024 · 22 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…
The mass-error checker and its intended scope Replied, post #64 · Data & Tools › Calculators · 21 Jun 2024 · 8 likes This follows post #61 rather than contradicting it. Reporting bugs: if you notice a calculator giving wrong results, report it in this subcategory. Bugs are fixed when…