d.fontaine

TL2 Moderator · Catania

Contributes reviews on supplier material. Based in Catania.

Joined 1 January 2025 · last posted 3d

80 posts, newest first. Showing up to 150.

[2026 update] Interpreting a result that disagrees with the supplier's certificate Replied, post #122 · Sourcing › Independent verification · 25 Jul 2026 · 0 likes VendorInvestigate: documentation and supplier-practice review. Reviews paperwork rather than vials. Tells you something about a supplier's systems but says nothing…
Follow-up: How compounding permissions changed when supply normalised Replied, post #62 · Sourcing › Regulatory · 23 Jul 2026 · 0 likes Why this category is maintained as documentation, not as recommendations: the goal is factual accuracy and sourcing, not endorsement of any specific regulatory position.
What a certificate commits its issuer to Replied, post #84 · Analytics › COA interpretation · 23 Jul 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…
Revisiting: Why the absence of controlled human data on BPC-157 matters more than people… Replied, post #47 · Compounds › Repair & healing peptides · 22 Jul 2026 · 6 likes Why plausible mechanism is not evidence of effect: a mechanism that is chemically or biologically plausible can fail in practice for dozens of reasons —…
The headache that turns out to be dehydration — the long version Replied, post #65 · Nutrition & Training › Hydration & electrolytes · 11 Jul 2026 · 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.
[2026 update] Antibiotics and a course of something with delayed emptying Replied, post #26 · Practice › Interactions · 9 Jul 2026 · 8 likes Oral medications versus time: if you take an oral medication 30 minutes before semaglutide (which slows gastric emptying), the delayed stomach emptying affects when and…
Cold solution and stinging: the simplest fix Replied, post #40 · Practice › Administration · 28 Jun 2026 · 3 likes post #39 is right about the mechanism and I think understates the practical bit. Cold solution and stinging: warming the vial in your hands for a minute before…
Insurance and replacement policies, compared Replied, post #35 · Sourcing › Logistics · 22 Jun 2026 · 14 likes Coming back to post #33, because the follow-up matters more than the original answer. Packaging integrity on arrival: if a parcel arrives with compromised packaging,…
Does dual agonism explain the effect size, or is it dose? Replied, post #51 · Compounds › Tirzepatide · 21 Jun 2026 · 9 likes post #50 answers the question as asked. The question underneath it is different. The GIP component: GIP receptor agonism is thought to amplify the GLP-1 effect on…
Why we ask for units every single time, with three examples of what goes wrong Replied, post #46 · Start Here › How to Ask · 16 Jun 2026 · 0 likes Worth separating two things that post #42 runs together. What you have already read matters. Saying "I read the maintained page on this and I still have a gap" tells…
A 10 mg vial reconstituted three different ways, compared Replied, post #24 · Practice › Reconstitution · 5 Jun 2026 · 0 likes Worth separating two things that post #20 runs together. Over-dilution: if your target dose is 0.25 mg and your syringe is a 1 mL insulin syringe, you need a…
A reconstituted vial's beyond-use date and the reasoning behind common figures Replied, post #26 · Practice › Storage & stability · 3 Jun 2026 · 15 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…
A certificate whose chromatogram axes do not match its stated method — one year on Replied, post #8 · Sourcing › Red flags · 2 Jun 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…
Revisiting: The report format the maintainers ask for, and why each field is there Replied, post #77 · Sourcing › Vendor reports · 2 Jun 2026 · 3 likes Coming back to post #75, because the follow-up matters more than the original answer. Pattern across lots: a single result is a data point. Three or four results from…
Receptor desensitisation as a tolerance hypothesis, and its weak evidence Replied, post #8 · Pharmacology › Receptor biology · 1 Jun 2026 · 17 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…
Alcohol: what is documented and what is folklore Replied, post #32 · Practice › Interactions · 29 May 2026 · 27 likes post #31 is right about the mechanism and I think understates the practical bit. Thyroid medications: semaglutide is associated with a slowing of gastric emptying,…
Comparing my trajectory with the trial curves, carefully — a second dataset Replied, post #47 · Outcomes › Progress reports · 19 May 2026 · 0 likes Medication changes: escalating dose, or adding or removing other medications, can affect the rate of weight loss. Documenting medication changes alongside weight makes…
Reconstituting a multi-strength kit without mixing yourself up — what changed since Replied, post #13 · Practice › Reconstitution · 10 May 2026 · 28 likes Swirling versus inverting versus leaving it alone: the vial can be gently warmed (hands around it) and swirled with a rolling motion. Vigorous shaking introduces air…
Coming back to: Washout: how long is long enough, and for what purpose Replied, post #126 · Pharmacology › Pharmacokinetics · 2 May 2026 · 4 likes Hepatic metabolism: the degree to which each compound is hepatically metabolised versus renally cleared is known but varies. Severe liver disease changes clearance.
Semaglutide and gastric emptying — the mechanism behind most of the side-effect profile Replied, post #10 · Compounds › Semaglutide · 27 Apr 2026 · 0 likes Gastric emptying delay is the mechanism behind most of the gastrointestinal side effects. Slowing the stomach empties it feeds less food into the intestines at a time,…
A supplier who responds to a discrepancy with silence — what changed since Replied, post #36 · Sourcing › Red flags · 25 Apr 2026 · 0 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…
Manufacturer assistance programmes and their eligibility rules Replied, post #19 · Access › Pricing · 18 Apr 2026 · 23 likes International pricing: the same compound costs very different amounts in different countries because healthcare systems and regulatory frameworks differ. Generally, US…
Lean mass preservation: what the evidence supports — does this still hold? Replied, post #60 · Outcomes › Body composition · 17 Apr 2026 · 5 likes post #59 answers the question as asked. The question underneath it is different. Comparison to published data: the trials reported mean fat and lean mass changes.…
A single out-of-range value on an otherwise normal panel Replied, post #34 · Clinical › Bloodwork · 13 Apr 2026 · 7 likes This follows post #31 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…
Reconstitution volumes that produce round numbers, tabulated Replied, post #89 · Practice › Reconstitution · 12 Apr 2026 · 0 likes On post #85 — agreed on the reasoning, with one qualification. Osmolarity and reconstitution: the osmolarity of the reconstituted solution affects comfort on injection.…
[2026 update] Thyroid function tests during substantial weight change Replied, post #34 · Clinical › Bloodwork · 8 Apr 2026 · 0 likes HbA1c and glucose: HbA1c reflects average glucose over months; a spot glucose measurement reflects the moment. Trending glucose downward while HbA1c stays flat is a…
[2026 update] What a purity-only report leaves out Replied, post #82 · Sourcing › Independent verification · 8 Apr 2026 · 8 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 plateau that disappeared when I changed how I measured — the long version Replied, post #20 · Outcomes › Progress reports · 26 Mar 2026 · 10 likes Plateaus and resets: if weight loss stalls and then resumes, that is ordinary. It is not evidence that the medication stopped working. It is not evidence that it is…
An ABAB design with a data table and honest limitations — a second dataset Replied, post #83 · Research Methods › N-of-1 designs · 20 Mar 2026 · 14 likes post #82 answers the question as asked. The question underneath it is different. Blinding: blinding yourself (not knowing which condition you are in) removes…
Second pass at: Metformin co-administration and additive GI effects Replied, post #68 · Practice › Interactions · 17 Mar 2026 · 8 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…
Measurement error in home scales, with a worked standard deviation — the long version Replied, post #51 · Research Methods › Statistics · 12 Mar 2026 · 0 likes Confounding: a third variable explains an apparent association. In randomised data, randomisation balances confounders. In observational data, confounders can be…
The lowest dose that does anything: is that a real question? Replied, post #13 · Practice › Dosing & titration · 1 Mar 2026 · 1 like Stepping down deliberately: the withdrawal trials show that stopping is followed by regain. The step-down literature is thinner. The conservative assumption is that…
Second pass at: What pooling buys you and what it destroys Replied, post #21 · Evidence › Meta-analyses · 24 Feb 2026 · 0 likes Picking up post #18: that is the part I would want checked first. Study quality and weighting: some meta-analyses weight all studies equally; others weight by study…
[2026 update] A rising related-substance total over six months: degradation or method… Replied, post #42 · Analytics › Impurities & related substances · 15 Feb 2026 · 22 likes post #41 is right about the mechanism and I think understates the practical bit. Deamidation at asparagine and glutamine: adds 1 approximately. Frequently appears as a…
Second pass at: Which categories are strict and which are relaxed, honestly Replied, post #5 · Start Here › Welcome · 23 Jan 2026 · 5 likes Off-topic posts that do not belong here belong in the Lounge instead. You are not in trouble if a moderator moves your post — they are just routing it to the right…
Promotion criteria, and the one that stops most nominations — the long version Replied, post #137 · Documentation › Doc review · 21 Jan 2026 · 0 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…
Reading SURMOUNT-1 without the press release — one year on Replied, post #40 · Compounds › Tirzepatide · 21 Jan 2026 · 10 likes Worth separating two things that post #36 runs together. Dual agonism versus dose: how much of tirzepatide's effect is the GIP component and how much is simply…
Reference intervals: how they are constructed and why one in twenty flags Replied, post #37 · Clinical › Bloodwork · 17 Jan 2026 · 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…
Vomiting: when it is expected and when it is a reason to stop Replied, post #11 · Practice › Side effects · 26 Dec 2025 · 1 like I read post #9 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…
MHRA statements, read directly Replied, post #49 · Regional › UK & Ireland · 15 Dec 2025 · 0 likes Coming back to post #47, 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…
Airline travel with a temperature-sensitive injectable Replied, post #22 · Devices › Cold chain · 13 Dec 2025 · 5 likes I read post #20 twice before replying, because I had assumed the opposite. Domestic refrigeration: most lyophilised peptides are stored at 2–8 °C (35–46 °F). That is…
What a good consultation looks like from the other side Replied, post #2 · Clinical › Prescriber conversations · 2 Dec 2025 · 26 likes Discussing off-label dosing: if you want to dose differently than the label specifies (slower titration, higher final dose), discussing that explicitly and…
[2026 update] What steady state means for the decision to escalate Replied, post #68 · Practice › Dosing & titration · 12 Nov 2025 · 0 likes Micro-titration: the concept of increments smaller than the labelled steps. It has no evidence base from trials but is described by some people. The downside is that…
Second pass at: Programming during a large energy deficit Replied, post #75 · Nutrition & Training › Resistance training · 10 Nov 2025 · 4 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…
Documentation that appears only after payment Replied, post #68 · Sourcing › Red flags · 5 Nov 2025 · 9 likes This follows post #65 rather than contradicting it. Exaggerated claims without documentation: every compound has limits. No peptide is "100% pure" because purity is…
The anatomy of a question that gets answered within an hour — the long version Replied, post #35 · Start Here › How to Ask · 28 Oct 2025 · 33 likes Questions you cannot explain: "I cannot say why I am asking this, but is this compound stable at room temperature?" is more productive than no question at all. People…
Price changes over 2025 and 2026, tabulated and dated — does this still hold? Replied, post #3 · Access › Pricing · 21 Oct 2025 · 32 likes I read the opening post twice before replying, because I had assumed the opposite. Subscription services and subscriptions: some online clinics bundle compounds into…
Where impurities in solid-phase peptide synthesis come from Replied, post #10 · Analytics › Impurities & related substances · 28 Sep 2025 · 28 likes Truncation products: fragments from incomplete synthesis or from degradation. They elute quite differently from the intact peptide because they are much smaller and…
Revisiting: German, French and Dutch differences, compared Replied, post #71 · Regional › European Union · 11 Sep 2025 · 9 likes On post #67 — agreed on the reasoning, with one qualification. France: ANSM implements EU framework. Reimbursement has been narrower for weight management. Prescribing…
A request that was declined, and the reasoning — a second dataset Replied, post #46 · Documentation › Wiki requests · 10 Aug 2025 · 2 likes This follows post #43 rather than contradicting it. Authority and authorship: if you think a maintained page needs input from someone with specific expertise (a…
How to read a forest plot, properly, from scratch Replied, post #13 · Evidence › Trials · 7 Aug 2025 · 27 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…
Canadian access and provincial variation — one year on Replied, post #12 · Regional › North America · 21 Jul 2025 · 15 likes Telehealth prescribing: widespread in the US and varying in quality. Models without a clinician reviewing measurements and history are not recommended by this community.
A field-by-field walk through a certificate of analysis Replied, post #85 · Analytics › COA interpretation · 16 Jul 2025 · 26 likes Sterility testing is separate: chromatographic purity, mass spectrometry, and endotoxin testing all say nothing about whether a solution is sterile. If sterility…
[2026 update] Clearance pathways and what renal impairment changes Replied, post #41 · Pharmacology › Pharmacokinetics · 12 Jun 2025 · 20 likes This follows post #38 rather than contradicting it. Fasting requirement for oral semaglutide: food and large fluid volumes reduce absorption. The fasting window (30…
Needle changes between doses on a reusable pen Replied, post #8 · Devices › Pens & autoinjectors · 12 May 2025 · 7 likes Coming back to post #6, because the follow-up matters more than the original answer. Priming: most pens require priming before the first use (injecting a small amount…
Comparators chosen for regulatory reasons rather than clinical ones — one year on Replied, post #19 · Evidence › Trials · 28 Apr 2025 · 23 likes This follows post #16 rather than contradicting it. Risk of bias: structured appraisal of internal validity. Key things to assess: randomisation method (was it truly…
Metformin co-administration and additive GI effects Replied, post #10 · Practice › Interactions · 23 Apr 2025 · 2 likes Metformin: commonly co-administered and relevant to gastrointestinal tolerability. Gastrointestinal side effects can overlap and additive. Taking them separately or…
A promotion I argued against, and why I lost Replied, post #140 · Documentation › Doc review · 20 Mar 2025 · 0 likes Revision disputes: if you disagree with an edit a maintainer made to a page, discuss it here. The goal is accuracy and clarity, not authorship.
One lot is one lot: when a report becomes a pattern — the long version Replied, post #119 · Sourcing › Vendor reports · 18 Mar 2025 · 3 likes Pattern across lots: a single result is a data point. Three or four results from the same supplier showing a consistent pattern becomes a record worth discussing. Two…
Delayed gastric emptying and oral medication absorption: which drugs matter Replied, post #16 · Practice › Interactions · 15 Mar 2025 · 14 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…
Consistent declarations and why they matter more than clever ones Replied, post #117 · Sourcing › Logistics · 3 Mar 2025 · 1 like At what point is a parcel genuinely a problem: if it was despatched weeks ago and there has been no update for days at customs, it might be held or lost. Days of delay…
Pharmaceutical compounding rules, summarised from primary sources Replied, post #58 · Sourcing › Regulatory · 2 Mar 2025 · 2 likes Worth separating two things that post #54 runs together. Import restrictions vary by compound and by jurisdiction: what is a controlled substance in one place is legal…
Consistent declarations and why they matter more than clever ones Replied, post #86 · Sourcing › Logistics · 25 Feb 2025 · 11 likes Customs holds: if a parcel is held at customs and you can contact customs directly, declaring your personal use and providing documentation (order, labelling) can help.…
Requesting a page: what makes a good request Replied, post #4 · Documentation › Wiki requests · 20 Feb 2025 · 0 likes Picking up the opening post: that is the part I would want checked first. Authority and authorship: if you think a maintained page needs input from someone with…
A promotion I argued against, and why I lost Replied, post #93 · Documentation › Doc review · 11 Feb 2025 · 4 likes Promoted topic withdrawal: if a promoted topic becomes outdated or inaccurate and the maintainer does not update, requesting withdrawal is appropriate.
Journal club: SUSTAIN 6 and its retinopathy signal — does this still hold? Replied, post #39 · Evidence › Journal club · 9 Feb 2025 · 10 likes post #38 answers the question as asked. The question underneath it is different. TRIUMPH (ongoing): Retatrutide phase 3. No results yet. Nothing should be attributed to…
Anxiety in the first weeks: drug, situation, or both Replied, post #47 · Wellbeing › Mental health · 7 Feb 2025 · 11 likes post #46 is right about the mechanism and I think understates the practical bit. Support and community: some people process weight change through community (online or…
Reading a supplementary appendix and finding the interesting part Replied, post #66 · Evidence › Trials · 13 Jan 2025 · 23 likes Picking up post #63: that is the part I would want checked first. Intent-to-treat versus per-protocol: ITT includes everyone assigned regardless of whether they took…
Coming back to: Preparing for an appointment: one page, three questions Replied, post #143 · Clinical › Prescriber conversations · 9 Jan 2025 · 0 likes Discussing off-label dosing: if you want to dose differently than the label specifies (slower titration, higher final dose), discussing that explicitly and…
Research-use-only status: what it means legally and practically — a second dataset Replied, post #39 · Compounds › Other compounds · 13 Dec 2024 · 13 likes post #38 is right about the mechanism and I think understates the practical bit. Distinguishing marketed research compounds from true chemical synthesis: some online…
[2026 update] New subcategory: rationale and scope Replied, post #50 · Meta › Announcements · 8 Dec 2024 · 20 likes post #49 is right about the mechanism and I think understates the practical bit. When announcements are made: major policy changes, technical changes affecting site…
Fixed versus detachable needles: the trade-offs Replied, post #25 · Devices › Syringes & needles · 29 Nov 2024 · 29 likes Sharps disposal: needles and syringes should be disposed in a sharps container (a rigid, puncture-resistant container). Do not put them in regular trash. Many…
[2026 update] Step therapy requirements and how to satisfy them Replied, post #29 · Access › Insurance & coverage · 16 Nov 2024 · 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…
Over-dilution: when your dose falls below one readable graduation Replied, post #6 · Practice › Reconstitution · 22 Oct 2024 · 6 likes A vial that will not fully dissolve: check in order: is the diluent genuinely room temperature (some preservatives crystallise in cold), is the vial being warmed gently…
Coming back to: Research-use-only labelling: what it means and what it does not Replied, post #7 · Sourcing › Regulatory · 15 Oct 2024 · 0 likes Worth separating two things that post #3 runs together. Two things before anyone answers the substance. First, the context in the first post is clear and specific.…
Revisiting: Melanocortin agonists: mechanism and the documented adverse profile Replied, post #47 · Compounds › Other compounds · 13 Oct 2024 · 0 likes Distinguishing marketed research compounds from true chemical synthesis: some online suppliers sell compounds that are genuinely novel and difficult to obtain…
The topic list is dense — is that deliberate? Replied, post #32 · Meta › Site feedback · 30 Sep 2024 · 1 like Moderation decisions: if you disagree with a moderation decision, raising it here gives it visibility. Staff will reconsider if you make a substantive case.
Why a preprint's supplementary material is often the best part Replied, post #35 · Evidence › Preprints · 23 Sep 2024 · 4 likes How to cite a preprint: author last name, first initial, et al. Title. Server name [preprint]. Posted date. Doi. Include the server name and note that it is a preprint.
Correlation in a self-tracked dataset: what it can support Replied, post #80 · Research Methods › Statistics · 23 Aug 2024 · 11 likes Worth separating two things that post #76 runs together. Multiplicity and multiple comparisons: if you test many hypotheses, the chance of finding a false positive by…
Guidelines revision: what changed and why Replied, post #38 · Meta › Announcements · 26 Jul 2024 · 9 likes Questions welcomed: if an announcement is unclear, asking for clarification is welcome. Staff will explain their reasoning.