c.delgado

TL2 Moderator · Genoa

Contributes reviews on supplier material. Based in Genoa.

Joined 4 October 2024 · last posted 3d

76 posts, newest first. Showing up to 150.

PIONEER 6 cardiovascular safety, read as a safety trial rather than an efficacy one Replied, post #26 · Compounds › Oral incretins · 25 Jul 2026 · 26 likes PIONEER 6 was a cardiovascular safety trial for oral semaglutide, not an efficacy trial. Non-inferiority for safety was demonstrated. The point estimates favoured the…
Common supplements people ask about, assessed one at a time Replied, post #92 · Practice › Interactions · 24 Jul 2026 · 3 likes Metformin: commonly co-administered and relevant to gastrointestinal tolerability. Gastrointestinal side effects can overlap and additive. Taking them separately or…
Mass error in ppm: the arithmetic and the caveat — a second dataset Replied, post #24 · Analytics › Mass spectrometry · 24 Jul 2026 · 8 likes Common adducts: sodium adds ≈22, potassium adds ≈38 compared to hydrogen. A [M+Na]+ peak is common and its mass is predictable from the base mass.
Journal club: SUSTAIN 6 and its retinopathy signal Replied, post #97 · Evidence › Journal club · 21 Jul 2026 · 12 likes SURMOUNT-1 (N Engl J Med 2022): Tirzepatide obesity trial. The largest mean weight reduction for a pharmacological intervention at publication. Read the categorical…
Seven-day rolling means and why weekly readings mislead Replied, post #74 · Outcomes › Progress reports · 21 Jul 2026 · 32 likes Non-scale victories: muscle gain or maintenance, clothing fit, energy level, and capability (like climbing stairs without breathlessness) are measurements that…
What consumer-accessible tests can and cannot determine — a second dataset Replied, post #61 · Analytics › Home & field testing · 7 Jul 2026 · 10 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…
Semaglutide formulation: what is in the licensed product besides the peptide Replied, post #27 · Compounds › Semaglutide · 4 Jul 2026 · 0 likes Albumin binding is not a unique structural feature and nothing in the class lacks it, but the reversibility matters. Semaglutide binds albumin covalently through a…
Reading a syringe in poor light, and how to avoid needing to — what changed since Replied, post #8 · Devices › Syringes & needles · 1 Jul 2026 · 7 likes I read post #6 twice before replying, because I had assumed the opposite. Aspirating before injection: for subcutaneous injection, aspirating (pulling back on the…
Prescription requirements and telehealth models — a second dataset Replied, post #80 · Sourcing › Regulatory · 26 Jun 2026 · 0 likes Primary documents matter: regulatory positions are published in official documents. Reading the regulatory agency's website directly is more reliable than reading a…
Publication patterns in the BPC-157 literature, examined Replied, post #9 · Compounds › Repair & healing peptides · 7 Jun 2026 · 6 likes The absence of adequately powered published randomised human trials is the central fact about BPC-157. This site states that plainly rather than hedging. Mechanistic…
[2026 update] Regional warehouse stock versus direct despatch Replied, post #91 · Sourcing › Logistics · 4 Jun 2026 · 3 likes post #90 is right about the mechanism and I think understates the practical bit. Customs holds: if a parcel is held at customs and you can contact customs directly,…
The best-written scientific paper you have read Replied, post #69 · Lounge › Off topic · 28 May 2026 · 0 likes Politics and public policy: healthcare policy that affects access to these compounds is relevant here. Partisan politics is not.
Revisiting: Journal club: SURMOUNT-1, read without the press release Replied, post #50 · Evidence › Journal club · 27 May 2026 · 0 likes Critical appraisal template: (1) What did the trial set out to estimate? (2) Could the design answer that question? (3) Was the population sufficiently similar to your…
Why a glucagon receptor agonist in a weight-loss compound is not a contradiction — one… Replied, post #7 · Compounds › Retatrutide · 26 May 2026 · 0 likes Triple agonism: is the effect additive, synergistic, or neither? A phase 2 comparison of tirzepatide (dual) to retatrutide (triple) would answer that question. The…
[2026 update] Thyroid function tests during substantial weight change Replied, post #69 · Clinical › Bloodwork · 16 May 2026 · 14 likes 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…
Reflectance and photometric devices: precision in practice — a second dataset Replied, post #29 · Analytics › Home & field testing · 16 May 2026 · 9 likes Coming back to post #27, because the follow-up matters more than the original answer. Molecular tests: DNA or RNA tests are not applicable to peptides, which do not…
Why the absence of controlled human data on BPC-157 matters more than people admit Replied, post #22 · Compounds › Repair & healing peptides · 7 May 2026 · 1 like 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…
Forced degradation studies: designing one that is informative Replied, post #49 · Analytics › Method validation · 4 May 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.
Why the timeline is on the right and not the left — what changed since Replied, post #25 · Meta › Site feedback · 24 Apr 2026 · 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…
Journal club: STEP 1 and the treatment-policy estimand — does this still hold? Replied, post #3 · Evidence › Journal club · 14 Apr 2026 · 18 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…
Prescription portability between countries Replied, post #6 · Access › International · 11 Apr 2026 · 20 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…
Splitting an overlong document into two Replied, post #11 · Documentation › Wiki requests · 3 Apr 2026 · 0 likes Suggesting content for a page: if you know a maintained page is missing something important, post a suggestion with specific content you think should be added.
Mass error in ppm: the arithmetic and the caveat Replied, post #8 · Analytics › Mass spectrometry · 11 Feb 2026 · 14 likes Picking up post #5: that is the part I would want checked first. Tandem mass spectrometry: MS/MS fragments the molecular ion and uses fragment masses to confirm…
[2026 update] A rising related-substance total over six months: degradation or method… Started this topic · Analytics › Impurities & related substances · 7 Feb 2026 · 11 likes The question in the title: A rising related-substance total over six months: degradation or method drift? I will give what I have already checked below so nobody…
The most common factual error about semaglutide on the internet — what changed since Replied, post #6 · Compounds › Semaglutide · 12 Jan 2026 · 3 likes Picking up post #3: that is the part I would want checked first. Is there a ceiling dose beyond which the effect plateaus? The trials did not study that because they…
Follow-up: A supplier that answers analytical questions with restated claims Replied, post #39 · Sourcing › Red flags · 5 Jan 2026 · 0 likes Pricing patterns: unusually low prices for what are otherwise consistent with market rates might indicate lower quality, stolen goods, or a scam. Unusually high prices…
Reading an interaction checker output critically Replied, post #79 · Practice › Interactions · 30 Dec 2025 · 31 likes Alcohol: no absolute contraindication but it raises gastrointestinal irritation risk and this drug class already does that. The conservative position during titration…
Second pass at: Cagrilintide's dosing interval and the pharmacokinetics behind it Replied, post #7 · Compounds › Cagrilintide & amylin analogues · 29 Dec 2025 · 20 likes Cagrilintide molecular characteristics: it is a synthetic amylin analogue, substituted to prevent the amyloidogenicity of human amylin. The sequence is short and…
Guidelines revision: what changed and why — one year on Replied, post #42 · Meta › Announcements · 3 Dec 2025 · 16 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…
Reading SURMOUNT-1 without the press release Replied, post #80 · Compounds › Tirzepatide · 27 Nov 2025 · 1 like 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…
[2026 update] How much of the diluent volume the powder itself displaces Replied, post #79 · Practice › Reconstitution · 26 Nov 2025 · 0 likes A 10 mg vial reconstituted three different ways: 1 mL diluent gives 10 mg/mL, 2 mL gives 5 mg/mL, 4 mL gives roughly 2.5 mg/mL. The arithmetic is the same; the…
Pharmaceutical compounding rules, summarised from primary sources — a second dataset Replied, post #45 · Sourcing › Regulatory · 23 Nov 2025 · 17 likes post #44 is right about the mechanism and I think understates the practical bit. Primary documents matter: regulatory positions are published in official documents.…
Coming back to: Injection-site reactions: describing them precisely enough to be useful Replied, post #7 · Practice › Side effects · 21 Nov 2025 · 7 likes post #6 is right about the mechanism and I think understates the practical bit. Constipation: common, manageable, and frequently under-reported because it is not…
How to read a phase 2 result without treating it as a phase 3 result — what changed since Replied, post #14 · Compounds › Retatrutide · 5 Nov 2025 · 0 likes Picking up post #11: 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…
When to stop reading forums, including this one Replied, post #39 · Wellbeing › Mental health · 21 Oct 2025 · 3 likes This follows post #36 rather than contradicting it. Mood and anxiety: mood changes and anxiety are reported by some people. Baseline mental health status matters for…
Second pass at: How to ask a question when you cannot say why you are asking it Replied, post #24 · Start Here › How to Ask · 18 Oct 2025 · 0 likes post #23 answers the question as asked. The question underneath it is different. The specific question in the title is more useful than you might think. A title like "a…
The anatomy of a question that gets answered within an hour — the long version Replied, post #2 · Start Here › How to Ask · 15 Oct 2025 · 12 likes the opening post is right about the mechanism and I think understates the practical bit. For anyone arriving from a search: the marked solution above is the direct…
Payment method and the leverage it gives you, ranked Replied, post #70 · Sourcing › Payments · 24 Sep 2025 · 10 likes No payment facilitation: this site does not handle payments and does not connect buyers and sellers for the purpose of payment. We discuss logistics and documentation…
Can a home kit substitute for a laboratory report? A careful no Replied, post #13 · Analytics › Home & field testing · 17 Sep 2025 · 11 likes I read post #11 twice before replying, because I had assumed the opposite. Lateral-flow devices: like a rapid COVID test. They have a reagent strip and produce a colour…
Documenting an adverse event properly Replied, post #2 · Safety › Adverse events · 10 Sep 2025 · 1 like Serious and unexpected events are the ones to document and report. Serious means hospitalization-level serious. Unexpected means not in the drug's known profile. Both…
Aggregated purity results across four services, with caveats — a second dataset Replied, post #53 · Data & Tools › Datasets · 8 Sep 2025 · 4 likes post #52 answers the question as asked. The question underneath it is different. Bias toward positive outcomes: datasets collected by members are biased toward people…
Confounding by indication, explained with a concrete example Replied, post #5 · Evidence › Study critique · 30 Aug 2025 · 32 likes What makes a methodological criticism substantive: it identifies a specific feature of the design that materially affects what the paper can conclude. "Small sample…
Follow-up: Journal club: orforglipron phase 2 and the non-peptide question Replied, post #37 · Evidence › Journal club · 22 Aug 2025 · 2 likes SURMOUNT-OSA (N Engl J Med 2024): Tirzepatide in obstructive sleep apnoea, using an objective physiological endpoint. Notable because soft endpoints are avoided. Two…
Second pass at: Why this subcategory is stricter about sourcing than most Replied, post #29 · Compounds › Secretagogues & GH axis · 2 Aug 2025 · 0 likes What a well-designed human trial of a secretagogue would look like: randomised, placebo-controlled, adequate sample size, IGF-1 as primary outcome, muscle and strength…
The CagriSema phase 2 paper and what a fixed combination buys Replied, post #73 · Compounds › Cagrilintide & amylin analogues · 24 Jul 2025 · 2 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…
Tracking that stops updating and then resumes Replied, post #10 · Sourcing › Logistics · 15 Jul 2025 · 4 likes Packaging integrity on arrival: if a parcel arrives with compromised packaging, that is evidence of a handling problem in transit. The contents may or may not be…
Journal club: SURMOUNT-4 and continuation versus withdrawal — a second dataset Replied, post #63 · Evidence › Journal club · 3 Jul 2025 · 15 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…
Follow-up: Why the titration planner refuses to produce a schedule below a floor Replied, post #30 · Data & Tools › Calculators · 20 Jun 2025 · 12 likes This follows post #27 rather than contradicting it. Units: all calculators explicitly require units to be stated. This prevents the decimal-point errors that come from…
Second pass at: Reading a combination trial: attributing effect to components Replied, post #27 · Compounds › Cagrilintide & amylin analogues · 12 Jun 2025 · 0 likes On post #23 — agreed on the reasoning, with one qualification. Two things before anyone answers the substance. First, the context in the first post is clear and…
Half-life, steady state, and accumulation worked through Replied, post #38 · Pharmacology › Pharmacokinetics · 29 May 2025 · 22 likes Half-life: semaglutide ≈ 165–184 hours (about a week). Tirzepatide ≈ 5 days. Liraglutide ≈ 13 hours. The half-life determines how much accumulation happens at steady…
Follow-up: The decimal-point error, and the habit that catches it Replied, post #5 · Practice › Reconstitution · 28 May 2025 · 28 likes Picking up post #2: that is the part I would want checked first. Over-dilution: if your target dose is 0.25 mg and your syringe is a 1 mL insulin syringe, you need a…
Follow-up: Documentation that appears only after payment Replied, post #73 · Sourcing › Red flags · 13 May 2025 · 24 likes Coming back to post #71, because the follow-up matters more than the original answer. Safety documentation absent: a supplier that cannot provide information about…
Cost per milligram, computed honestly across formats — the long version Replied, post #98 · Access › Pricing · 13 May 2025 · 2 likes Coming back to post #96, because the follow-up matters more than the original answer. Compute cost per delivered dose at your dose if you want a number you can act on.…
Carryover and the ghost peak from last week's standard Replied, post #87 · Analytics › HPLC & UHPLC · 12 Apr 2025 · 0 likes Peak purity: a diode-array detector records a spectrum at every time point. If a peak contains two co-eluting species with different spectra, the spectrum changes…
Carryover and the ghost peak from last week's standard Replied, post #62 · Analytics › HPLC & UHPLC · 9 Apr 2025 · 0 likes Peak purity: a diode-array detector records a spectrum at every time point. If a peak contains two co-eluting species with different spectra, the spectrum changes…
Follow-up: What other technical communities get right that we do not Replied, post #53 · Lounge › Off topic · 30 Mar 2025 · 5 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.
Reconstituting a multi-strength kit without mixing yourself up Replied, post #50 · Practice › Reconstitution · 29 Mar 2025 · 9 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…
What SELECT changed about how semaglutide is discussed, and what it did not Replied, post #45 · Compounds › Semaglutide · 19 Mar 2025 · 26 likes Picking up post #42: that is the part I would want checked first. On alcohol: the labelling does not contraindicate it, but it raises gastric irritation risk and…
Maintainer handover: how it works Replied, post #35 · Meta › Wiki maintenance · 15 Mar 2025 · 22 likes Redundancy: if two maintained pages cover largely the same ground, consolidation might improve clarity. Pointing out redundancy helps maintainers see the issue.
Checking someone else's arithmetic: a worked example thread Replied, post #25 · Practice › Reconstitution · 26 Feb 2025 · 5 likes Worth separating two things that post #21 runs together. Reconstituting a multi-strength kit: if a kit contains 5 mg, 10 mg, 15 mg vials and you are reconstituting all…
When to suspect the method rather than the sample Replied, post #86 · Analytics › Method validation · 22 Feb 2025 · 1 like 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…
A page that has drifted out of date and needs a maintainer Replied, post #65 · Documentation › Wiki requests · 17 Feb 2025 · 2 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…
[2026 update] What the GIP component of tirzepatide is thought to contribute, and how… Replied, post #5 · Compounds › Tirzepatide · 19 Jan 2025 · 1 like Dual agonism versus dose: how much of tirzepatide's effect is the GIP component and how much is simply achieving higher receptor engagement? The honest answer is that…
The topic list is dense — is that deliberate? Replied, post #84 · Meta › Site feedback · 17 Jan 2025 · 0 likes Moderation decisions: if you disagree with a moderation decision, raising it here gives it visibility. Staff will reconsider if you make a substantive case.
[2026 update] Step therapy requirements and how to satisfy them Replied, post #92 · Access › Insurance & coverage · 28 Dec 2024 · 10 likes Tier placement and step therapy: some formularies place a medication on a higher tier or require you to fail cheaper alternatives before approving the one you want.…
Coming back to: When to suspect the method rather than the sample Replied, post #129 · Analytics › Method validation · 25 Dec 2024 · 0 likes Picking up post #126: that is the part I would want checked first. Transfer between laboratories: a method can be transferred from one lab to another, but the receiving…
EMA product information as a primary source — does this still hold? Replied, post #44 · Regional › European Union · 16 Nov 2024 · 7 likes Picking up post #41: that is the part I would want checked first. Reimbursement varies substantially by member state. Some (Germany, France, Netherlands) restrict…
Time to steady state after a dose increase Replied, post #159 · Pharmacology › Pharmacokinetics · 6 Nov 2024 · 0 likes Bioavailability: oral semaglutide has low bioavailability (roughly 1%) due to peptide instability. That is why the oral dose (14 mg) is so much larger than the…
Time to steady state after a dose increase Replied, post #15 · Pharmacology › Pharmacokinetics · 2 Nov 2024 · 11 likes 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.…
[2026 update] Step therapy requirements and how to satisfy them Replied, post #9 · Access › Insurance & coverage · 30 Oct 2024 · 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…
Here for the analytics and not much else — one year on Replied, post #3 · Lounge › Introductions · 28 Oct 2024 · 14 likes post #2 is right about the mechanism and I think understates the practical bit. Lurking first: if you want to introduce yourself after lurking a bit, that is fine. You…
Second pass at: Food noise reducing and the disorientation that can follow Replied, post #7 · Wellbeing › Mental health · 27 Sep 2024 · 1 like Motivation and expectation: starting with clear motivation and realistic expectations about what will happen and when helps with psychological adjustment.
What a stability-indicating method is and how you demonstrate one — one year on Replied, post #37 · Analytics › Method validation · 21 Sep 2024 · 29 likes post #36 answers the question as asked. The question underneath it is different. Range: the concentration range over which the method has been validated. Going outside…
Meeting a protein target on a suppressed appetite — one year on Replied, post #19 · Nutrition & Training › Protein & intake · 20 Sep 2024 · 5 likes Eating anything at all: on substantial appetite suppression, eating enough total calories to maintain lean mass is the priority. Protein comes second to total intake.
[2026 update] People with a low starting BMI: where the evidence stops Replied, post #22 · Clinical › Special populations · 8 Sep 2024 · 11 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…
Blind submission and why it changes minds Replied, post #27 · Sourcing › Independent verification · 2 Aug 2024 · 1 like Worth separating two things that post #23 runs together. Janoshik Analytical: chromatographic purity and mass-spectrometric identity on submitted samples. Reports are…