m.ramos

TL2 Moderator · Haarlem

Contributes reviews on supplier material. Based in Haarlem.

Joined 7 October 2024 · last posted 4d

84 posts, newest first. Showing up to 150.

[2026 update] Detection wavelength and why 214 nm and 280 nm disagree Replied, post #64 · Analytics › HPLC & UHPLC · 24 Jul 2026 · 26 likes post #63 is right about the mechanism and I think understates the practical bit. This is why a purity figure without the underlying chromatogram is weaker evidence than…
Spreadsheets: an appreciation — what changed since Replied, post #107 · Lounge › Off topic · 21 Jul 2026 · 8 likes post #106 is right about the mechanism and I think understates the practical bit. Adjacent and interesting: you might post something about nutrition, bioavailability…
Pooling trials with different estimands Replied, post #92 · Evidence › Meta-analyses · 12 Jul 2026 · 0 likes post #91 is right about the mechanism and I think understates the practical bit. I disagree with the reply above, and I think the disagreement is substantive rather…
How much context is too much context in a first post? Replied, post #65 · Start Here › How to Ask · 9 Jul 2026 · 0 likes On post #61 — agreed on the reasoning, with one qualification. Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly…
Request: tag synonyms surfaced in search Replied, post #13 · Meta › Feature requests · 7 Jul 2026 · 5 likes I read post #11 twice before replying, because I had assumed the opposite. Community support: if other people support your request, they can reply with "+1" or "I would…
[2026 update] Antibiotics and a course of something with delayed emptying Replied, post #18 · Practice › Interactions · 7 Jul 2026 · 28 likes This follows post #15 rather than contradicting it. Anticoagulants: no direct interaction with the compounds in this class. Weight loss and body composition changes…
When a dose reduction is the correct response to a side effect Replied, post #36 · Practice › Dosing & titration · 6 Jul 2026 · 13 likes Steady state means the plasma concentration is stable from dose to dose. That happens around 4 to 5 half-lives. Before that, the concentration is rising with each dose.…
Personal or family history of medullary thyroid carcinoma Replied, post #26 · Safety › Contraindications · 28 Jun 2026 · 8 likes post #25 is right about the mechanism and I think understates the practical bit. Severe renal impairment (eGFR
Peak-to-trough ratio at steady state for a weekly agent — the long version Replied, post #30 · Pharmacology › Pharmacokinetics · 21 Jun 2026 · 5 likes post #29 answers the question as asked. The question underneath it is different. For anyone arriving from a search: the marked solution above is the direct answer, and…
Coming back to: Specificity, linearity, accuracy, precision, range, robustness — with… Replied, post #57 · Analytics › Method validation · 17 Jun 2026 · 0 likes Specificity: the method can distinguish the intended compound from related impurities and degradation products. Tested by comparing results on pure compounds, mixtures…
Official shortage notices and what they authorise Replied, post #104 · Access › Shortages · 13 Jun 2026 · 24 likes Picking up post #101: that is the part I would want checked first. Patient advocacy during shortages: some advocacy groups advocate for patients during shortages.…
[2026 update] Interpreting a result that disagrees with the supplier's certificate Replied, post #14 · Sourcing › Independent verification · 12 Jun 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…
Injection volume, overload, and peak distortion Replied, post #43 · Analytics › HPLC & UHPLC · 9 Jun 2026 · 0 likes This follows post #40 rather than contradicting it. Before anything else: what was the gradient, and at what wavelength? Area percent at different wavelengths is not…
Second pass at: When your prescriber and the evidence disagree Replied, post #33 · Clinical › Prescriber conversations · 9 Jun 2026 · 0 likes Picking up post #30: that is the part I would want checked first. Questions about dose: asking "how will we determine whether this dose is working for me" gets at the…
Second pass at: The storage lookup and where its data comes from Replied, post #28 · Data & Tools › Calculators · 8 Jun 2026 · 8 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…
Coming back to: Swirling versus inverting versus leaving it alone Replied, post #18 · Practice › Reconstitution · 2 Jun 2026 · 0 likes How much of the diluent volume the powder itself displaces: for a small peptide vial, the powder volume is negligible. For a larger vial or a kit with multiple…
Pancreatitis history and the risk calculus Replied, post #15 · Safety › Contraindications · 1 Jun 2026 · 3 likes Concurrent insulin or sulfonylureas: not an absolute contraindication but requires dose adjustment and close monitoring for hypoglycemia. The combination is used with…
Peak-to-trough ratio at steady state for a weekly agent Replied, post #22 · Pharmacology › Pharmacokinetics · 31 May 2026 · 0 likes Renal clearance: these compounds are cleared partly via the kidney. In severe renal impairment, clearance is slowed and accumulation risk is higher. Dose adjustments…
Second pass at: A pooled estimate that changed when one trial was added Replied, post #17 · Evidence › Meta-analyses · 30 May 2026 · 3 likes Coming back to post #15, because the follow-up matters more than the original answer. Fixed-effects versus random-effects models: fixed-effects assumes all studies are…
Batch numbers that do not match the vial label — what changed since Replied, post #24 · Sourcing › Red flags · 29 May 2026 · 8 likes I read post #22 twice before replying, because I had assumed the opposite. Inconsistency across documents: a certificate stating one purity, a website claiming another,…
The anatomy of a question that gets answered within an hour Replied, post #48 · Start Here › How to Ask · 17 May 2026 · 12 likes Avoid "any advice?" at the end. It is so generic that people do not know which part of the post it refers to. Pick the specific part and ask that specific question…
Pinch or no pinch, and how needle length changes the answer — what changed since Replied, post #21 · Practice › Administration · 29 Apr 2026 · 13 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: Drawing up with one needle and injecting with another Replied, post #47 · Practice › Administration · 5 Apr 2026 · 0 likes On post #43 — agreed on the reasoning, with one qualification. Leak-back after withdrawal: a small amount of liquid on the skin after withdrawal is ordinary. Whether…
Preprint servers and what screening they do Replied, post #97 · Evidence › Preprints · 21 Mar 2026 · 1 like post #96 is right about the mechanism and I think understates the practical bit. Thank you for the correction. I have edited my earlier post with a note rather than…
Follow-up: Levothyroxine timing: a real interaction with a simple fix Replied, post #3 · Practice › Interactions · 19 Mar 2026 · 22 likes Supplements and herbs: many have no established interaction. Some do. If you are taking something unusual, checking a reference (like a pharmacist) is more useful than…
Completing a dose with a second syringe, and the dead-volume arithmetic Replied, post #14 · Practice › Administration · 12 Mar 2026 · 0 likes post #13 is right about the mechanism and I think understates the practical bit. Air bubbles in a subcutaneous injection: the honest risk assessment is low. Tiny air…
Pregnancy and pregnancy planning: contraindication and washout Replied, post #64 · Clinical › Special populations · 6 Mar 2026 · 30 likes On post #60 — agreed on the reasoning, with one qualification. Gastroparesis: pre-existing severe delayed gastric emptying can worsen with compounds that slow it…
Warfarin and altered intake: the monitoring argument — the long version Replied, post #123 · Practice › Interactions · 2 Mar 2026 · 0 likes Separation timing versus clinically important interaction: a separation timing inconvenience (taking one medication 2 hours before or after another) is not the same as…
MHRA statements, read directly Replied, post #99 · Regional › UK & Ireland · 1 Mar 2026 · 15 likes MHRA is the regulator. Licensed incretin analogues are prescription-only medicines. NHS and private prescribing routes exist with materially different access criteria…
Revisiting: Maintainer handover: how it works Replied, post #19 · Meta › Wiki maintenance · 27 Feb 2026 · 1 like Maintainer handovers: if a page's maintainer is inactive and needs a new one, discussing that here can facilitate the transition.
[2026 update] Amylin and gastric emptying: overlapping mechanisms with incretins Replied, post #7 · Compounds › Cagrilintide & amylin analogues · 26 Feb 2026 · 7 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…
Common supplements people ask about, assessed one at a time — a second dataset Replied, post #58 · Practice › Interactions · 25 Feb 2026 · 12 likes Insulin interaction: semaglutide and tirzepatide are not contraindicated with insulin but the combination carries hypoglycemia risk if insulin doses are not adjusted.…
Completing a dose with a second syringe, and the dead-volume arithmetic Replied, post #5 · Practice › Administration · 12 Feb 2026 · 25 likes Bleeding at the injection site: normal and usually minimal. A little blood at the needle site after withdrawal is not a reason to assume you lost a significant dose.…
A history of disordered eating: proceeding carefully Replied, post #68 · Wellbeing › Mental health · 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…
Angle of injection and whether 90 degrees is always right Replied, post #85 · Practice › Administration · 19 Jan 2026 · 0 likes Angle of injection: 90 degrees into pinched tissue ensures subcutaneous placement. It is not always necessary and shallower angles can work, but 90 degrees into a small…
Pharmacy supply in the UK and the questions you will be asked Replied, post #10 · Regional › UK & Ireland · 14 Jan 2026 · 14 likes Importing for personal use: importing a prescription-only medicine without a prescription is not lawful. Material sold as research-use-only is not a licensed medicine…
Vomiting: when it is expected and when it is a reason to stop Replied, post #87 · Practice › Side effects · 29 Dec 2025 · 9 likes This follows post #84 rather than contradicting it. Delayed gastric emptying: the mechanism behind much of the gastrointestinal side-effect profile. At extreme…
Heterogeneity as information rather than as a nuisance Replied, post #35 · Evidence › Meta-analyses · 23 Dec 2025 · 0 likes On post #31 — agreed on the reasoning, with one qualification. Inclusion and exclusion criteria: a meta-analysis is only as good as its inclusion criteria. If the…
Reconstitution volumes that produce round numbers, tabulated Replied, post #12 · Practice › Reconstitution · 22 Dec 2025 · 1 like Coming back to post #10, because the follow-up matters more than the original answer. A vial that will not fully dissolve: check in order: is the diluent genuinely room…
Preprint servers and what screening they do Replied, post #4 · Evidence › Preprints · 19 Dec 2025 · 3 likes What changes between preprint and publication: authors respond to reviewer comments, re-analyse data, correct errors found in peer review, and sometimes report…
Coming back to: Feature request: should a dose-equivalence tool exist at all? Replied, post #38 · Data & Tools › Calculators · 13 Dec 2025 · 0 likes The calculators maintained on this site are open-source and verifiable. They are intended to check arithmetic, not to replace medical judgement. Using them is optional…
Angle of injection and whether 90 degrees is always right Replied, post #64 · Practice › Administration · 11 Dec 2025 · 0 likes Coming back to post #62, because the follow-up matters more than the original answer. Drawing up with one needle and injecting with another: a reasonable practice if…
Meeting a protein target on a suppressed appetite Replied, post #40 · Nutrition & Training › Protein & intake · 5 Dec 2025 · 0 likes I read post #38 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…
How the vendor documentation pages are maintained, and by whom — what changed since Replied, post #98 · Sourcing › Vendor reports · 25 Nov 2025 · 28 likes Picking up post #95: that is the part I would want checked first. Disputed records: when a result disagreed and was not explained, the record says disputed and stays…
Documentation that materially improves an appeal's chances Replied, post #73 · Access › Insurance & coverage · 22 Nov 2025 · 4 likes Picking up post #70: that is the part I would want checked first. Coverage for weight management versus diabetes: many formularies cover these compounds for type 2…
Second pass at: The mass-error checker and its intended scope Replied, post #51 · Data & Tools › Calculators · 30 Oct 2025 · 0 likes The calculators maintained on this site are open-source and verifiable. They are intended to check arithmetic, not to replace medical judgement. Using them is optional…
How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ — a second dataset Replied, post #3 · Sourcing › Independent verification · 11 Oct 2025 · 33 likes How to submit a sample: contact the service directly. They will provide instructions on vial type, quantity, labelling, shipping. Following their instructions exactly…
The nausea timeline across the first four weeks, with a tabulated log — what changed since Replied, post #11 · Practice › Side effects · 7 Oct 2025 · 5 likes On post #7 — agreed on the reasoning, with one qualification. Recognition and grading: nausea ranges from "noticeable" to "limiting". Constipation ranges from mild to…
Thyroid function tests during substantial weight change Replied, post #86 · Clinical › Bloodwork · 6 Oct 2025 · 0 likes Lipid panel interpretation: total, LDL, HDL, triglycerides all on one panel. Reading them together is more informative than reading one value in isolation. An elevated…
Coming back to: Where the integrator drew the baseline, and how much it moved the number Replied, post #12 · Analytics › HPLC & UHPLC · 26 Sep 2025 · 5 likes System suitability testing: injections run before and during the sample run to establish whether the instrument, column and method were performing when the sample was…
Reverse causation in a cohort study of weight and outcome — a second dataset Started this topic · Evidence › Study critique · 11 Sep 2025 · 0 likes Reverse causation in a cohort study of weight and outcome — a second dataset Writing it up because I had to work it out twice and would rather nobody else did. Session…
Follow-up: Journal club: orforglipron phase 2 and the non-peptide question Replied, post #70 · Evidence › Journal club · 2 Sep 2025 · 0 likes I read post #68 twice before replying, because I had assumed the opposite. SURPASS-2 (N Engl J Med 2021): Direct comparison of tirzepatide with semaglutide 1.0 mg. The…
Reading a supplier's product description as a marketing document Replied, post #54 · Compounds › Other compounds · 7 Aug 2025 · 7 likes Picking up post #51: that is the part I would want checked first. Melanocortin agonists: mechanism involves the melanocortin-4 receptor pathway that regulates appetite.…
Temperature loggers worth the money Replied, post #15 · Devices › Cold chain · 3 Aug 2025 · 5 likes Temperature excursions: brief excursions above 8 °C are tolerable for most compounds. Hours to a day at room temperature is usually acceptable. Days to weeks at room…
High-resolution MS on aggregates and what it can see Replied, post #31 · Analytics › Mass spectrometry · 27 Jul 2025 · 21 likes Worth separating two things that post #27 runs together. What mass accuracy establishes: the measured mass is consistent with a specific composition. What it does not…
[2026 update] Citation sweep results: how many references did not say what was claimed Replied, post #42 · Meta › Wiki maintenance · 9 Jul 2025 · 0 likes This follows post #39 rather than contradicting it. Revision disputes: if you disagree with an edit a maintainer made, discussing it here invites resolution rather than…
Second pass at: How to research a compound with no human data without deceiving yourself Replied, post #68 · Compounds › Other compounds · 19 Jun 2025 · 0 likes When "no data" is the complete and final answer: if there is no published human data on a compound, that is the state of knowledge. Hope is not a substitute and…
Repeatability versus intermediate precision Replied, post #15 · Analytics › Method validation · 19 Jun 2025 · 0 likes Stability-indicating method: one that can separate a compound from its degradation products. Critical for assay methods that claim to measure actual degradation (as…
A report I filed that turned out to be wrong, and the correction Replied, post #79 · Sourcing › Vendor reports · 31 May 2025 · 13 likes This follows post #76 rather than contradicting it. Pattern across lots: a single result is a data point. Three or four results from the same supplier showing a…
A claim built entirely on a subgroup analysis Replied, post #49 · Evidence › Study critique · 22 May 2025 · 0 likes Criticise the method, not the author: a paper with a weak design is not a bad paper by someone with bad intentions. It is a paper that answers a limited question.…
Lean mass preservation: what the evidence supports Replied, post #23 · Outcomes › Body composition · 19 May 2025 · 2 likes I read post #21 twice before replying, because I had assumed the opposite. Resting metabolic rate: body composition affects metabolic rate. As fat mass decreases and…
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly Replied, post #82 · Compounds › Tirzepatide · 11 May 2025 · 4 likes SURMOUNT-4 used a randomised withdrawal design: everyone titrated, then those on maintenance were randomised to continue or placebo. Continuation maintained effect;…
Follow-up: Tesamorelin has an approved indication — what that changes about the evidence Replied, post #58 · Compounds › Secretagogues & GH axis · 8 May 2025 · 6 likes post #57 answers the question as asked. The question underneath it is different. For anyone arriving from a search: the marked solution above is the direct answer, and…
Fibre intake when total intake falls, and the constipation link Replied, post #63 · Nutrition & Training › Protein & intake · 5 May 2025 · 8 likes Micronutrition alongside protein: eating protein foods that are also good sources of micronutrients (iron, B vitamins, zinc) solves two problems at once.
Shakes versus food: a pragmatic assessment — the long version Replied, post #12 · Nutrition & Training › Protein & intake · 30 Apr 2025 · 1 like Liquid versus solid: protein in liquid form (shakes) is easier to consume in volume but might not be as satiating as solid food. Using both together can help.
A well-designed study with a badly written abstract Replied, post #4 · Evidence › Study critique · 31 Mar 2025 · 5 likes I read the opening post twice before replying, because I had assumed the opposite. Defending a paper against criticism: if the authors respond, they might clarify…
Retatrutide dose escalation in the published trials Replied, post #35 · Compounds › Retatrutide · 21 Mar 2025 · 0 likes On post #31 — agreed on the reasoning, with one qualification. How to read phase 2 without treating it as phase 3: phase 2 establishes that a dose range produces an…
How compounding permissions changed when supply normalised Replied, post #32 · Sourcing › Regulatory · 19 Mar 2025 · 19 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…
Charge states for a 4 kDa peptide, worked through Replied, post #138 · Analytics › Mass spectrometry · 17 Mar 2025 · 9 likes Electrospray ionisation produces multiply charged ions. For a 4 kDa peptide you expect mostly 2+, 3+, and 4+ charge states. Reading an electrospray spectrum means…
One lot is one lot: when a report becomes a pattern — the long version Replied, post #39 · Sourcing › Vendor reports · 16 Mar 2025 · 2 likes post #38 answers the question as asked. The question underneath it is different. Structured report format: compound, lot, independent testing service, method as…
Charge states for a 4 kDa peptide, worked through Replied, post #94 · Analytics › Mass spectrometry · 13 Mar 2025 · 18 likes Charge states observed: for semaglutide (4113.6 Da) the doubly charged ion appears at m/z ≈ 2057, triply charged at ≈ 1371, quadruply at ≈ 1029. Those are the positions…
Biased agonism: a real phenomenon, an over-used explanation Replied, post #76 · Pharmacology › Receptor biology · 11 Mar 2025 · 19 likes post #75 is right about the mechanism and I think understates the practical bit. GIP receptor signalling: the glucose-dependent insulinotropic peptide receptor (GIP) is…
Charge states for a 4 kDa peptide, worked through Replied, post #71 · Analytics › Mass spectrometry · 10 Mar 2025 · 0 likes I read post #69 twice before replying, because I had assumed the opposite. Purity and identity are different questions: LC-MS establishes that the species at a…
What the published dose-response for semaglutide actually looks like above 2.4 mg — a… Replied, post #92 · Compounds › Semaglutide · 8 Mar 2025 · 0 likes The SELECT trial changed the positioning because it was the first cardiovascular outcome trial in people without diabetes. That decoupled the cardiovascular argument…
Talking to a therapist about this specifically — does this still hold? Replied, post #24 · Wellbeing › Mental health · 2 Mar 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…
Amylin analogue mechanism: satiety signalling separate from GLP-1 Replied, post #49 · Compounds › Cagrilintide & amylin analogues · 12 Jan 2025 · 11 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…
Revisiting: Semaglutide formulation: what is in the licensed product besides the peptide Replied, post #34 · Compounds › Semaglutide · 24 Dec 2024 · 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…
[2026 update] Journal club: SURPASS-2 and the semaglutide 1 mg comparator Replied, post #42 · Evidence › Journal club · 25 Nov 2024 · 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…
US compounding rules and how they changed Replied, post #37 · Regional › North America · 23 Oct 2024 · 11 likes Regional variation in North America: access differs substantially by US state and Canadian province. Postcode is a major determinant of access.
When a red flag was a misunderstanding, and the retraction Replied, post #28 · Sourcing › Red flags · 5 Oct 2024 · 9 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…
Follow-up: A site rotation scheme that is easy enough to actually follow Replied, post #31 · Practice › Administration · 15 Sep 2024 · 24 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…
Cold packs, phase-change material, and what survives ten days Replied, post #138 · Sourcing › Logistics · 23 Jul 2024 · 12 likes Customs outcomes are not predictable at the level of an individual parcel. What is predictable is that consistent, accurate declarations correlate with fewer…
Reporting a discrepancy without making an allegation Started this topic · Sourcing › Vendor reports · 20 Jul 2024 · 60 likes On the subject in the title: Reporting a discrepancy without making an allegation Working notes rather than a conclusion. Structured report rather than an opinion,…
How this community labels and discusses unrefereed work Replied, post #55 · Evidence › Preprints · 2 Jul 2024 · 9 likes Server repositories: medRxiv for medicine, bioRxiv for biology. Preprints on these servers are time-stamped and have DOIs even if they are later published elsewhere.…