s.salgado

TL2 Moderator · Nantes

Contributes reviews on supplier material. Based in Nantes.

Joined 28 July 2025 · last posted 8d

82 posts, newest first. Showing up to 150.

Journal club: indirect comparison between two programmes, defended and attacked Replied, post #123 · Evidence › Journal club · 20 Jul 2026 · 2 likes post #122 answers the question as asked. The question underneath it is different. SELECT (N Engl J Med 2023): Semaglutide cardiovascular outcomes without diabetes. The…
Dizziness on standing: the ordinary explanation first — one year on Replied, post #15 · Nutrition & Training › Hydration & electrolytes · 15 Jul 2026 · 22 likes This follows post #12 rather than contradicting it. Magnesium: deficiency during weight loss is common and symptoms (fatigue, muscle cramps) are nonspecific.…
Coming back to: Specificity, linearity, accuracy, precision, range, robustness — with… Replied, post #91 · Analytics › Method validation · 15 Jul 2026 · 31 likes Transfer between laboratories: a method can be transferred from one lab to another, but the receiving lab needs to demonstrate that they can achieve the same…
Follow-up: External review after an internal denial Replied, post #9 · Access › Insurance & coverage · 14 Jul 2026 · 2 likes Generic versus brand: most of these compounds do not have generic versions yet. Once they do, formulary coverage and pricing will shift.
Stability of BPC-157 in solution: what has been measured — one year on Replied, post #90 · Compounds › Repair & healing peptides · 13 Jul 2026 · 2 likes Reading a preclinical wound-healing model: the model shows whether a mechanism is plausible in a specific context. It does not show magnitude of effect in humans, does…
[2026 update] Interpreting a result that disagrees with the supplier's certificate Replied, post #85 · Sourcing › Independent verification · 12 Jul 2026 · 8 likes Cost and turnaround: different services have different pricing and turnaround times. Janoshik's turnaround is weeks by mail; VendorInvestigate documentation review is…
Aggregate verification data across the directory, with caveats Replied, post #35 · Sourcing › Independent verification · 8 Jul 2026 · 13 likes Blind sampling: submitting without the laboratory or seller knowing the source removes the two easiest ways for a result to be shaped: selective submission and…
Athletes in weight-category sports: a different risk calculus Replied, post #14 · Clinical › Special populations · 5 Jul 2026 · 3 likes Worth separating two things that post #10 runs together. Gastroparesis: pre-existing severe delayed gastric emptying can worsen with compounds that slow it further.…
What a reversed-phase purity number actually is Replied, post #25 · Analytics › HPLC & UHPLC · 5 Jul 2026 · 1 like Coming back to post #23, because the follow-up matters more than the original answer. System suitability testing: injections run before and during the sample run to…
Common supplements people ask about, assessed one at a time Replied, post #9 · Practice › Interactions · 4 Jul 2026 · 0 likes I read post #7 twice before replying, because I had assumed the opposite. Alcohol: no absolute contraindication but it raises gastrointestinal irritation risk and this…
Evidence quality in the secretagogue literature: an honest assessment Started this topic · Compounds › Secretagogues & GH axis · 2 Jul 2026 · 20 likes Evidence quality in the secretagogue literature: an honest assessment Writing it up because I had to work it out twice and would rather nobody else did. Comparing…
Request: a per-category review queue Replied, post #47 · Meta › Feature requests · 19 Jun 2026 · 8 likes Deprecation requests: if you think a feature should be removed or changed, that is also a request. Explain why you think it would improve the site.
What changed in 2026, by region — does this still hold? Replied, post #16 · Access › International · 18 Jun 2026 · 2 likes On post #12 — agreed on the reasoning, with one qualification. Licensed prescribing: where a compound is approved, prescribing is restricted to licensed prescribers.…
An appeal that succeeded, with the letter structure — the long version Replied, post #105 · Access › Insurance & coverage · 16 Jun 2026 · 0 likes This follows post #102 rather than contradicting it. Reimbursement changes: a compound covered one year might not be the next. A formulary decision in January can…
Racemisation and why it is invisible to a mass measurement Replied, post #77 · Analytics › Impurities & related substances · 13 Jun 2026 · 0 likes Deletion sequences (incomplete coupling during synthesis): lower in mass by one residue. Chromatographically they usually elute earlier or later depending on the…
Pooling trials with different estimands Replied, post #14 · Evidence › Meta-analyses · 9 Jun 2026 · 15 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…
Comparing prices across jurisdictions without misleading yourself Replied, post #55 · Access › Pricing · 8 Jun 2026 · 1 like Cost per milligram is the only comparison that survives format differences, but even then it needs care. A pen and a vial are not the same product and cannot be…
Run-in periods and the population they select Replied, post #131 · Evidence › Trials · 6 Jun 2026 · 20 likes Surrogate endpoints: an endpoint that is not the outcome that matters but is measured as a stand-in. HbA1c is a surrogate for long-term glucose control and the…
Endotoxin and why it is a separate question from purity — what changed since Replied, post #28 · Analytics › Impurities & related substances · 26 May 2026 · 7 likes Off-target structures: if the sequence synthesis goes wrong, a completely different amino acid can be incorporated. The resulting off-target peptide is a structural…
Cost versus information: making the trade-off explicitly Replied, post #2 · Analytics › Home & field testing · 22 May 2026 · 1 like the opening post answers the question as asked. The question underneath it is different. What physical quantity does the device measure? A colorimetric or lateral-flow…
Prescription portability between countries Replied, post #40 · Access › International · 22 May 2026 · 25 likes Travel with medication: carrying a compound across borders is complicated by legal status. Documenting that it is prescribed and carrying proof reduces (but does not…
Second pass at: What a 2 ppm match establishes, and what it does not Replied, post #16 · Analytics › Mass spectrometry · 19 May 2026 · 4 likes Coming back to post #14, because the follow-up matters more than the original answer. Charge states observed: for semaglutide (4113.6 Da) the doubly charged ion appears…
Revisiting: Bioimpedance and hydration: why the number moves Started this topic · Outcomes › Body composition · 12 May 2026 · 0 likes Posting this under the heading it deserves: Revisiting: Bioimpedance and hydration: why the number moves Everything below is what sits behind that. Longitudinal report…
How to ask about something you suspect is a bad idea Replied, post #81 · Start Here › How to Ask · 26 Apr 2026 · 6 likes On post #77 — agreed on the reasoning, with one qualification. The specific question in the title is more useful than you might think. A title like "a question I have"…
Coming back to: How much context is too much context in a first post? Replied, post #2 · Start Here › How to Ask · 10 Apr 2026 · 30 likes I read the opening post twice before replying, because I had assumed the opposite. Chromatogram questions: describe the method first. Column type, gradient, wavelength,…
Micro-titration: a disputed topic, argued properly — one year on Replied, post #22 · Practice › Dosing & titration · 8 Apr 2026 · 7 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…
[2026 update] Composite endpoints and the component doing the work Replied, post #54 · Evidence › Trials · 2 Apr 2026 · 0 likes This follows post #51 rather than contradicting it. Multiplicity and multiple comparisons: if a trial tests many hypotheses, the chance of a false positive on at least…
[2026 update] Area percent versus weight percent: the confusion that causes most arguments Replied, post #24 · Analytics › HPLC & UHPLC · 30 Mar 2026 · 11 likes Coming back to post #22, because the follow-up matters more than the original answer. Detection wavelength: 214 nm detects the peptide bond and is relatively…
Blind submission and why it changes minds — the long version Replied, post #3 · Sourcing › Independent verification · 29 Mar 2026 · 15 likes VendorInvestigate: documentation and supplier-practice review. Reviews paperwork rather than vials. Tells you something about a supplier's systems but says nothing…
Spreadsheets: an appreciation — what changed since Replied, post #8 · Lounge › Off topic · 29 Mar 2026 · 18 likes post #7 is right about the mechanism and I think understates the practical bit. Community norms: if you want to discuss how the community should work (not moderation…
Type 2 diabetes and the largest part of the evidence base Replied, post #44 · Clinical › Comorbidities · 26 Mar 2026 · 6 likes Comorbidity control: if a comorbidity (high blood pressure, high lipids) is not adequately controlled, the decision about adding compounds in this class depends on the…
Journal club: is percentage weight change the right endpoint? Replied, post #4 · Evidence › Journal club · 20 Mar 2026 · 18 likes Picking up the opening post: that is the part I would want checked first. TRIUMPH (ongoing): Retatrutide phase 3. No results yet. Nothing should be attributed to it…
[2026 update] Confounding by indication, explained with a concrete example Replied, post #102 · Evidence › Study critique · 2 Mar 2026 · 13 likes When you change your mind: if a reply convinces you that your criticism was not well-founded, say so plainly. The critique might still be real but smaller than you…
How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ — a second dataset Replied, post #28 · Sourcing › Independent verification · 26 Feb 2026 · 11 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…
[2026 update] Reading a supplementary appendix and finding the interesting part Replied, post #24 · Evidence › Trials · 31 Jan 2026 · 32 likes Coming back to post #22, because the follow-up matters more than the original answer. Surrogate endpoints: an endpoint that is not the outcome that matters but is…
Coming back to: Private prescribing in the UK: what is actually involved Replied, post #55 · Regional › UK & Ireland · 10 Jan 2026 · 15 likes post #54 is right about the mechanism and I think understates the practical bit. Compounding pharmacies: UK allows compounding under specific conditions when a licensed…
Amylin analogue mechanism: satiety signalling separate from GLP-1 — does this still hold? Replied, post #7 · Compounds › Cagrilintide & amylin analogues · 22 Dec 2025 · 16 likes This follows post #4 rather than contradicting it. For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add…
Dead volume across syringe and needle combinations Replied, post #40 · Devices › Syringes & needles · 18 Dec 2025 · 4 likes Needle gauge: smaller numbers (30G) are finer and less painful. Larger numbers (25G) are courser. For subcutaneous injection, 27-30G is typical. Finer needles take…
Sequence verification for an obscure compound: how it is done — what changed since Replied, post #34 · Compounds › Other compounds · 23 Nov 2025 · 3 likes post #33 is right about the mechanism and I think understates the practical bit. How to research a compound with no human data: mechanistic plausibility is one input.…
Revisiting: Why tirzepatide titration schedules have more steps than semaglutide's Replied, post #33 · Compounds › Tirzepatide · 10 Nov 2025 · 8 likes post #32 is right about the mechanism and I think understates the practical bit. Mass and charge states: tirzepatide is about 4813.5 Da and on an electrospray…
Second pass at: Programming during a large energy deficit Replied, post #64 · Nutrition & Training › Resistance training · 2 Nov 2025 · 0 likes Adaptation and plateau: if strength does not change for weeks, that is stability, not backsliding. Expecting continuous progress during weight loss is unrealistic.
A 40-week log with the measurement method stated Replied, post #55 · Outcomes › Progress reports · 23 Oct 2025 · 10 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…
Sleep tracking data and its considerable limitations Replied, post #21 · Wellbeing › Sleep · 17 Oct 2025 · 6 likes Apnoea monitoring: if you have diagnosed or suspected sleep apnoea, periodic monitoring (annually) during weight loss is prudent because severity changes.
A preprint whose numbers changed substantially at publication Replied, post #90 · Evidence › Preprints · 13 Oct 2025 · 3 likes Check whether it was later published: searching for the preprint's first author and keywords in PubMed might find a published version. The published version is the…
Cagrilintide's dosing interval and the pharmacokinetics behind it Replied, post #21 · Compounds › Cagrilintide & amylin analogues · 1 Oct 2025 · 5 likes The CagriSema phase 2 paper: a fixed combination of the two components in one weekly injection. The trade-off of a fixed combination is that you cannot titrate the…
Follow-up: Why the titration planner refuses to produce a schedule below a floor Replied, post #88 · Data & Tools › Calculators · 20 Aug 2025 · 3 likes Picking up post #85: that is the part I would want checked first. Units: all calculators explicitly require units to be stated. This prevents the decimal-point errors…
Publishing an inconvenient result: a case study Replied, post #59 · Sourcing › Independent verification · 2 Aug 2025 · 8 likes On post #55 — agreed on the reasoning, with one qualification. Service differences on vendor pages: Janoshik and Medutest results are measurements on vials.…
A field-by-field walk through a certificate of analysis Replied, post #42 · Analytics › COA interpretation · 15 Jul 2025 · 12 likes On post #38 — agreed on the reasoning, with one qualification. Purity and content are different measurements: purity tells you what proportion of the detected material…
Second pass at: Triple agonism: additive, synergistic, or neither? Replied, post #77 · Compounds › Retatrutide · 10 Jul 2025 · 2 likes Retatrutide is investigational. Anything obtained outside a trial is by definition research-use-only material with no human-use authorisation. This site will state that…
Hepatic steatosis: what the MASH trial evidence supports Replied, post #77 · Clinical › Comorbidities · 28 Jun 2025 · 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.
Half-life, steady state, and accumulation worked through Replied, post #106 · Pharmacology › Pharmacokinetics · 12 Jun 2025 · 1 like Volume of distribution: the theoretical volume the drug distributes into. For albumin-binding compounds, volume is reduced compared to drugs that do not bind protein.…
Reading a chromatogram someone posted without axes Replied, post #43 · Analytics › HPLC & UHPLC · 9 Jun 2025 · 0 likes Coming back to post #41, because the follow-up matters more than the original answer. System suitability testing: injections run before and during the sample run to…
Second pass at: Trial registration and comparing the protocol with the paper Replied, post #20 · Evidence › Trials · 8 Jun 2025 · 3 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…
Coming back to: Getting a referral rather than a refusal Replied, post #38 · Clinical › Prescriber conversations · 6 Jun 2025 · 16 likes Understanding stopping rules: what would prompt stopping the compound? Adverse effect, lack of benefit after a defined time, or other reasons? Knowing in advance is…
[2026 update] Dose numbers across compounds are not on the same scale Replied, post #16 · Practice › Dosing & titration · 1 Jun 2025 · 20 likes The four-week escalation interval is a convention from the pivotal trials, not a pharmacological constant. The pharmacological argument is that with a week-long…
Micronutrient status when intake falls substantially Replied, post #7 · Clinical › Bloodwork · 26 May 2025 · 16 likes post #6 is right about the mechanism and I think understates the practical bit. A single value outside interval: usually uninformative on a single draw. What makes a…
Anxiety in the first weeks: drug, situation, or both Replied, post #75 · Wellbeing › Mental health · 15 Apr 2025 · 24 likes I read post #73 twice before replying, because I had assumed the opposite. Motivation and expectation: starting with clear motivation and realistic expectations about…
Retatrutide dose escalation in the published trials Replied, post #114 · Compounds › Retatrutide · 10 Apr 2025 · 0 likes Mass and identity: a report on retatrutide should state the mass detected by LC-MS, not assume a theoretical mass. The theoretical mass is not published in…
A promotion I argued against, and why I lost Replied, post #146 · Documentation › Doc review · 24 Mar 2025 · 19 likes Review date disputes: if a maintained page's review date is approaching and it has not been updated, post a note so the maintainers notice.
What the published dose-response for semaglutide actually looks like above 2.4 mg — a… Replied, post #105 · Compounds › Semaglutide · 17 Mar 2025 · 16 likes Semaglutide versus liraglutide in STEP 8: semaglutide produced greater weight reduction and the discontinuation rates differed. But the trial was open-label for the…
Reading a chromatogram someone posted without axes Replied, post #6 · Analytics › HPLC & UHPLC · 25 Feb 2025 · 19 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…
Second pass at: Gauge and length selection for subcutaneous injection Replied, post #33 · Devices › Syringes & needles · 21 Feb 2025 · 20 likes I read post #31 twice before replying, because I had assumed the opposite. Practical note that does not fit anywhere else. Whatever you conclude from this topic, write…
Coming back to: Official shortage notices and what they authorise Replied, post #24 · Access › Shortages · 17 Feb 2025 · 0 likes post #23 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…
Journal club: SUSTAIN 6 and its retinopathy signal — does this still hold? Replied, post #43 · Evidence › Journal club · 17 Feb 2025 · 0 likes SURPASS-2 (N Engl J Med 2021): Direct comparison of tirzepatide with semaglutide 1.0 mg. The 1.0 mg dose is not the highest available, which is the central and…
Coming back to: The nausea timeline across the first four weeks, with a tabulated log Replied, post #47 · Practice › Side effects · 3 Feb 2025 · 10 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…
Canadian access and provincial variation Replied, post #21 · Regional › North America · 26 Jan 2025 · 1 like Provincial formularies in Canada are published and are the correct source for coverage information. Coverage for weight management is less common than for diabetes.
[2026 update] Step therapy requirements and how to satisfy them Replied, post #123 · Access › Insurance & coverage · 15 Jan 2025 · 0 likes post #122 answers the question as asked. The question underneath it is different. Prior authorisation: pre-approval requirements and how to satisfy them. Most denials…
What changed in 2026, by region Replied, post #76 · Access › International · 14 Jan 2025 · 0 likes Regulatory position dates: a regulatory position is only current as of when it was written. Rechecking is prudent, especially if you saw it months ago.
Oral semaglutide bioavailability and its variability between people — a second dataset Replied, post #16 · Compounds › Oral incretins · 25 Dec 2024 · 31 likes Coming back to post #14, because the follow-up matters more than the original answer. Oral versus injectable exposure: comparing a 14 mg oral dose with a 0.5 mg…
Building a sensible monitoring schedule with your prescriber Replied, post #108 · Clinical › Bloodwork · 23 Dec 2024 · 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…
Isotonicity and what happens when you get it wrong Replied, post #4 · Pharmacology › Formulation chemistry · 20 Dec 2024 · 0 likes Excipients and their purposes: mannitol, sucrose, or other sugars in lyophilised formulations protect the peptide during drying and storage. They are not impurities;…
Second pass at: Gauge and length selection for subcutaneous injection Replied, post #7 · Devices › Syringes & needles · 6 Dec 2024 · 0 likes Picking up post #4: that is the part I would want checked first. I disagree with the reply above, and I think the disagreement is substantive rather than…
When "no data" is the complete and final answer Replied, post #26 · Compounds › Other compounds · 22 Nov 2024 · 25 likes Why catalogue breadth is not evidence of anything: a supplier listing 500 compounds does not make the 450 untested ones likely to work. It makes them untested compounds…
Coming back to: Preparing for an appointment: one page, three questions Replied, post #102 · Clinical › Prescriber conversations · 17 Nov 2024 · 14 likes post #101 answers the question as asked. The question underneath it is different. Questions about dose: asking "how will we determine whether this dose is working for…
Revisiting: Melanocortin agonists: mechanism and the documented adverse profile Replied, post #111 · Compounds › Other compounds · 12 Nov 2024 · 3 likes Distinguishing marketed research compounds from true chemical synthesis: some online suppliers sell compounds that are genuinely novel and difficult to obtain…
Revisiting: How to bring a laboratory report to an appointment usefully Replied, post #141 · Clinical › Bloodwork · 25 Oct 2024 · 2 likes Reference intervals: constructed to contain the central 95% of a reference population, which means one in twenty healthy people falls outside one by definition. Add…
Journal club: SURPASS-2 and the semaglutide 1 mg comparator Replied, post #43 · Evidence › Journal club · 14 Sep 2024 · 29 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.
Revisiting: How to bring a laboratory report to an appointment usefully Replied, post #3 · Clinical › Bloodwork · 31 Aug 2024 · 3 likes On the opening post — agreed on the reasoning, with one qualification. Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down…
Coming back to: The nausea timeline across the first four weeks, with a tabulated log Replied, post #9 · Practice › Side effects · 20 Aug 2024 · 13 likes post #8 answers the question as asked. The question underneath it is different. Hair shedding: telogen effluvium associated with rapid weight loss is reported. The…
The topic list is dense — is that deliberate? Replied, post #6 · Meta › Site feedback · 20 Jul 2024 · 17 likes Worth separating two things that post #2 runs together. Accessibility: screen readers, keyboard navigation, contrast, font size — if something is not accessible to you,…
Oral contraceptives and delayed emptying: what the data shows Replied, post #65 · Practice › Interactions · 18 Jul 2024 · 10 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…
Cold packs, phase-change material, and what survives ten days Replied, post #86 · Sourcing › Logistics · 9 Jul 2024 · 24 likes post #85 is right about the mechanism and I think understates the practical bit. Reshipment after seizure: if a parcel is seized, some suppliers will reship; others…