c.correia

TL2 · Basel

Contributes reviews on supplier material. Based in Basel.

Joined 15 April 2025 · last posted 20h

80 posts, newest first. Showing up to 150.

Here for the analytics and not much else Replied, post #102 · Lounge › Introductions · 27 Jul 2026 · 18 likes Welcome: the response to introductions is usually welcome. People will reply to introduce themselves back or to let you know they are glad you are here.
[2026 update] Interpreting a result that disagrees with the supplier's certificate Replied, post #125 · Sourcing › Independent verification · 26 Jul 2026 · 2 likes Second-hand on Interpreting a result, so weight it accordingly — someone whose method I trust told me this and I have not verified it myself.
Follow-up: How compounding permissions changed when supply normalised Replied, post #65 · Sourcing › Regulatory · 24 Jul 2026 · 9 likes Nothing in this subcategory is legal advice, and the members who work in regulated environments are the most careful to say so.
Receptor desensitisation as a tolerance hypothesis, and its weak evidence Replied, post #49 · Pharmacology › Receptor biology · 19 Jul 2026 · 22 likes GLP-1 receptor agonism produces its metabolic effects through more than one route: central satiety signalling, delayed gastric emptying, and glucose-dependent insulin…
[2026 update] Interpreting a result that disagrees with the supplier's certificate Replied, post #100 · Sourcing › Independent verification · 17 Jul 2026 · 18 likes Helpful, and short, which on this subject is harder than long.
Journal club: SUSTAIN 6 and its retinopathy signal Replied, post #44 · Evidence › Journal club · 10 Jul 2026 · 0 likes Everything in post #40 holds. The case it does not cover is the one I have. The figures usually contain the finding and the text usually contains the interpretation.…
Does a peptide degrade silently, with no visual change? Replied, post #59 · Practice › Storage & stability · 30 Jun 2026 · 26 likes Reframing peptide slightly, because I think the disagreement is about the question rather than the answer. If the question is "does it happen", yes. If it is "how…
Coming back to: Specificity, linearity, accuracy, precision, range, robustness — with… Replied, post #64 · Analytics › Method validation · 23 Jun 2026 · 0 likes Forced degradation under acid, base, oxidation, heat and light is how specificity is actually demonstrated. The chromatograms from that work are more informative than…
How shortages have affected compounding permissions — does this still hold? Replied, post #12 · Access › Shortages · 12 Jun 2026 · 22 likes Shortage status determines what compounding is permitted in some jurisdictions, which links two questions that otherwise seem unrelated. This has been discussed before…
Follow-up: Search filters: what is missing Replied, post #125 · Meta › Site feedback · 10 Jun 2026 · 0 likes Search filters: I have looked for the primary source twice and failed twice. Either it does not exist or it is somewhere I do not know to look, and I would like to know…
A reconstituted vial's beyond-use date and the reasoning behind common figures Replied, post #27 · Practice › Storage & stability · 3 Jun 2026 · 0 likes Right, and stated more narrowly than I would have dared to state it.
Revisiting: The report format the maintainers ask for, and why each field is there Replied, post #76 · Sourcing › Vendor reports · 31 May 2026 · 16 likes Narrowing post #75, because the general version has more than one answer. The cost of a submission is worth stating. It is the main reason people do not do this and…
Run-in periods and the population they select Replied, post #126 · Evidence › Trials · 29 May 2026 · 2 likes Narrowing post #125, because the general version has more than one answer. Nothing in a trial report is medical advice about an individual, and the gap between a…
I have no scientific background — can I still follow the analytics categories? Replied, post #3 · Start Here › Welcome · 14 May 2026 · 32 likes The Lounge is a real category rather than a dumping ground. The sourcing rule still applies there, which surprises people, but the register is looser and nobody minds a…
Micro-titration: a disputed topic, argued properly — one year on Replied, post #35 · Practice › Dosing & titration · 11 May 2026 · 1 like I would rather this thread reach "we do not know" about Micro-titration than reach a confident answer that nobody can support when asked.
Reconstituting a multi-strength kit without mixing yourself up — what changed since Replied, post #12 · Practice › Reconstitution · 7 May 2026 · 0 likes Post #11 is right about the mechanism and I think understates the practical bit. Do not shake. Swirl, or leave it. Vigorous agitation introduces air and shear, and…
The best-written scientific paper you have read Replied, post #32 · Lounge › Off topic · 5 May 2026 · 0 likes Community norms: if you want to discuss how the community should work (not moderation decisions, which go in Meta) the Lounge is a place for that casual discussion.
Blind submission and why it changes minds — the long version Replied, post #36 · Sourcing › Independent verification · 22 Apr 2026 · 0 likes Adding a reference point for Blind submission. Mine is a single case, collected without controls, and I am posting the method alongside it so it can be discounted…
A single out-of-range value on an otherwise normal panel Replied, post #37 · Clinical › Bloodwork · 21 Apr 2026 · 11 likes The documentation on single out-of-range value is better than this thread and I say that as someone who has posted in the thread.
System suitability injections: if they failed, the run did not happen — the long version Replied, post #2 · Analytics › HPLC & UHPLC · 11 Apr 2026 · 19 likes Gradient slope is the single biggest driver of apparent purity differences. A shallower gradient over a longer run resolves more impurities and gives a higher purity…
[2026 update] Thyroid function tests during substantial weight change Replied, post #35 · Clinical › Bloodwork · 9 Apr 2026 · 2 likes Taking post #33 at face value and following it one step further. The question underneath Thyroid function tests during substantial is usually "how would I tell?" rather…
A parcel stationary at a customs facility for nine days Replied, post #46 · Sourcing › Logistics · 7 Apr 2026 · 0 likes Thank you — that answers what I came here to find out.
Measurement error in home scales, with a worked standard deviation — the long version Replied, post #61 · Research Methods › Statistics · 25 Mar 2026 · 0 likes Baseline imbalance in a randomised trial is expected by chance and adjusting for it post hoc is a choice that should have been pre-specified. Worth saying I have only…
Coming back to: Time to steady state after a dose increase Replied, post #19 · Pharmacology › Pharmacokinetics · 23 Mar 2026 · 9 likes A missed weekly dose perturbs a slowly moving average rather than creating a trough. That is the pharmacokinetic reason the labelling does not recommend doubling. The…
Micro-titration: a disputed topic, argued properly Replied, post #49 · Practice › Dosing & titration · 21 Mar 2026 · 10 likes Going back down a step is not a failure and the trials allowed it. Several protocols permitted a return to the previous dose for tolerability and then a second attempt…
[2026 update] Distinguishing expected GI effects from something that needs urgent… Replied, post #11 · Practice › Side effects · 19 Mar 2026 · 6 likes Gastrointestinal effects in this class are dose-related and escalation-related. Both are true simultaneously, which is why symptoms typically return at each step and…
Fibre intake when total intake falls, and the constipation link — one year on Replied, post #2 · Nutrition & Training › Protein & intake · 13 Mar 2026 · 0 likes Self-reported intake is optimistic by a consistent margin in the published comparisons, which is worth applying to your own numbers. The interesting part of this is the…
Second pass at: Metformin co-administration and additive GI effects Replied, post #65 · Practice › Interactions · 12 Mar 2026 · 26 likes A pharmacist can answer most questions in this subcategory in a few minutes with access to a proper interaction database, and that access is the thing a forum does not…
Second pass at: What pooling buys you and what it destroys Replied, post #26 · Evidence › Meta-analyses · 11 Mar 2026 · 0 likes Post #24 and I disagree about the size of the effect, not about the direction. Study quality and weighting: some meta-analyses weight all studies equally; others weight…
Coming back to: Training through a dose escalation week Replied, post #47 · Nutrition & Training › Resistance training · 9 Mar 2026 · 12 likes Recovery: heavier training on a energy deficit and on a compound that slows gastric emptying requires attention to recovery (sleep, nutrition, stress). Recovery…
The lowest dose that does anything: is that a real question? Replied, post #12 · Practice › Dosing & titration · 1 Mar 2026 · 9 likes The reason lowest dose keeps being re-asked is that the answer is conditional and people quote it without the condition. It is not that the answer is unknown.
Second pass at: Identical chromatograms across two different lots Replied, post #15 · Sourcing › Red flags · 19 Feb 2026 · 13 likes Reporting something here requires the batch, the date, the method and the document, which is exactly what makes the reports worth reading two years later. If anyone has…
Interpreting a result that disagrees with the supplier's certificate Replied, post #122 · Sourcing › Independent verification · 14 Feb 2026 · 29 likes What a supplier does when asked is itself information, and it is information that a chromatogram cannot provide.
The 2.5 mg starting dose is not a therapeutic dose — why that matters Replied, post #7 · Compounds › Tirzepatide · 4 Feb 2026 · 4 likes I had read the opposite somewhere and cannot now find where, which tells me something.
Filter needles: when they help and what they cost you Replied, post #39 · Devices › Syringes & needles · 30 Jan 2026 · 0 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…
Second pass at: Which categories are strict and which are relaxed, honestly Replied, post #2 · Start Here › Welcome · 13 Jan 2026 · 9 likes No notes. Posting so the count is not one.
The nausea timeline across the first four weeks, with a tabulated log — what changed since Replied, post #26 · Practice › Side effects · 10 Jan 2026 · 5 likes Taking nausea timeline seriously for a moment rather than deflecting: the honest position is that the community has observations and no controlled comparison, and those…
Vomiting: when it is expected and when it is a reason to stop Replied, post #14 · Practice › Side effects · 26 Dec 2025 · 12 likes The relationship between symptom burden and outcome is not what people assume. Feeling worse is not evidence of a larger effect and feeling nothing is not evidence of…
Airline travel with a temperature-sensitive injectable Replied, post #23 · Devices › Cold chain · 17 Dec 2025 · 20 likes Shipping container and cold packs: reputable suppliers use insulated containers with cold packs designed to arrive cool. Checking on arrival that cold packs are still…
Follow-up: A supplier that answers analytical questions with restated claims Started this topic · Sourcing › Red flags · 25 Nov 2025 · 5 likes A supplier that answers analytical questions with restated claims — setting out what I have, and where I think it stops being reliable. A follow-up question about…
Second pass at: Programming during a large energy deficit Replied, post #78 · Nutrition & Training › Resistance training · 12 Nov 2025 · 19 likes The arithmetic in post #77 is right; the assumption feeding it is the part to check. Taking Programming during a large energy seriously for a moment rather than…
Revisiting: Why tirzepatide titration schedules have more steps than semaglutide's Replied, post #9 · Compounds › Tirzepatide · 6 Nov 2025 · 0 likes Reading back through the tirzepatide titration schedules threads from last year, the same three questions come up every time and only one of them has ever been answered…
Price changes over 2025 and 2026, tabulated and dated — does this still hold? Replied, post #2 · Access › Pricing · 18 Oct 2025 · 1 like Taking Price changes seriously for a moment rather than deflecting: the honest position is that the community has observations and no controlled comparison, and those…
Compounds this community declines to help with, and why Replied, post #52 · Compounds › Other compounds · 3 Oct 2025 · 10 likes Where I part company with post #50, and it is a narrow parting. Thymosin alpha-1 has a regulatory history in several jurisdictions and a real clinical literature, which…
Pooling trials with different estimands — what changed since Replied, post #32 · Evidence › Meta-analyses · 3 Oct 2025 · 32 likes I had written a reply contradicting post #28 and deleted it. Here is what survived. If you are new and reading this thread for the answer to Pooling trials with…
A preprint whose numbers changed substantially at publication Replied, post #76 · Evidence › Preprints · 3 Oct 2025 · 23 likes A preprint that has been up for two years without appearing in a journal is telling you something, and it is not necessarily that the work is bad. I would rather be…
Request: a diff view for wiki revisions — the long version Replied, post #37 · Meta › Feature requests · 1 Sep 2025 · 10 likes Use case: explain why you think the feature would help. "I would use this to..." makes the request concrete. Same conclusion as the reply above, reached differently,…
Hepatic impairment and the absence of data Replied, post #8 · Clinical › Special populations · 7 Aug 2025 · 21 likes Hepatic impairment: less is known about dosing in significant liver disease than in kidney disease. Extreme caution applies because the liver metabolises a large…
Reading SURMOUNT-1 without the press release — one year on Started this topic · Compounds › Tirzepatide · 31 Jul 2025 · 21 likes Reading SURMOUNT-1 without the press release — one year on — setting out what I have, and where I think it stops being reliable. I would like to disagree carefully with…
How to read a forest plot, properly, from scratch Replied, post #9 · Evidence › Trials · 26 Jul 2025 · 10 likes Post #8 describes the usual case. This is about the unusual one. A treatment-policy estimand asks what happens to people assigned to a strategy, including those who…
Canadian access and provincial variation — one year on Replied, post #17 · Regional › North America · 22 Jul 2025 · 0 likes The most useful thing anyone has posted about Canadian access and provincial variation in this category was a table of what had been measured and by whom. That is what…
Second pass at: Triple agonism: additive, synergistic, or neither? Replied, post #82 · Compounds › Retatrutide · 20 Jul 2025 · 2 likes Heart rate increased in a dose-dependent way in the phase 2 work. That is not a footnote — it is one of the specific things phase 3 exists to characterise, and it is…
Why "any advice?" is the least effective ending for a post — the long version Replied, post #26 · Start Here › How to Ask · 17 Jul 2025 · 3 likes Helpful, and short, which on this subject is harder than long.
Insulin combinations and hypoglycaemia risk Replied, post #17 · Practice › Interactions · 22 Jun 2025 · 0 likes I read the earlier replies on insulin combinations and hypoglycaemia risk twice before writing this, because I had assumed the opposite and wanted to be sure I was…
Retatrutide phase 2 in type 2 diabetes: the Lancet paper Replied, post #11 · Compounds › Retatrutide · 12 Jun 2025 · 31 likes Retatrutide is investigational. Material obtained outside a clinical trial is research-use-only by definition, is not approved for human use, and carries no assurance…
Follow-up: What other technical communities get right that we do not Replied, post #124 · Lounge › Off topic · 8 Jun 2025 · 3 likes Community norms: if you want to discuss how the community should work (not moderation decisions, which go in Meta) the Lounge is a place for that casual discussion.
Follow-up: Tracking intake honestly when appetite is absent Replied, post #35 · Nutrition & Training › Protein & intake · 7 Jun 2025 · 19 likes Protein supplements: whey, casein, and plant-based protein powders can help hit targets when whole-food intake is limited by appetite. Protein quality (all essential…
Follow-up: How much fluid is actually needed, and how you would know Replied, post #17 · Nutrition & Training › Hydration & electrolytes · 28 May 2025 · 14 likes Post #13 describes the usual case. This is about the unusual one. The most useful posts here describe what was measured, what was changed, and what happened, in that…
Retatrutide dose escalation in the published trials Replied, post #103 · Compounds › Retatrutide · 8 Apr 2025 · 0 likes Following, with nothing to contribute beyond having asked the same thing elsewhere.
Documenting a supplier's response to a discrepancy — does this still hold? Replied, post #39 · Sourcing › Vendor reports · 30 Mar 2025 · 1 like Do not adjust a reported figure. Post what the laboratory said and put your interpretation in a separate sentence. That much is documented. The rest is how I have…
Charge states for a 4 kDa peptide, worked through Replied, post #20 · Analytics › Mass spectrometry · 4 Mar 2025 · 13 likes Building on post #19 rather than restating it. Positional isomers and epimers are mass-identical. Any argument that a mass result rules them out is wrong, and it is the…
Consistent declarations and why they matter more than clever ones Replied, post #89 · Sourcing › Logistics · 26 Feb 2025 · 7 likes That is consistent with mine, for whatever one more account is worth.
Requesting a page: what makes a good request Replied, post #7 · Documentation › Wiki requests · 24 Feb 2025 · 3 likes On post #5 — agreed on the reasoning, with one qualification. Accessibility feedback: if you have trouble accessing or reading a maintained page (screen reader issues,…
Coming back to: Official shortage notices and what they authorise Replied, post #11 · Access › Shortages · 10 Feb 2025 · 0 likes This follows post #8 rather than contradicting it. Worth separating Official shortage notices as a question about the compound from Official shortage notices as a…
Why mass spectrometry cannot tell you about an epimer Replied, post #49 · Analytics › Mass spectrometry · 6 Feb 2025 · 0 likes Trying to state the mass spectrometry position in a way that someone who disagrees would recognise as fair, because I do not think the version in this thread passes…
[2026 update] Lipid changes during rapid weight loss: the expected trajectory Replied, post #38 · Clinical › Bloodwork · 31 Jan 2025 · 0 likes Coming back to post #35, because the follow-up matters more than the original answer. Time of day: some biomarkers vary across the day. Cortisol in the morning differs…
Anxiety in the first weeks: drug, situation, or both Replied, post #44 · Wellbeing › Mental health · 30 Jan 2025 · 32 likes Where I part company with post #40, and it is a narrow parting. Social and relationship impacts: weight change affects how others perceive and interact with a person.…
Reading a supplementary appendix and finding the interesting part Replied, post #69 · Evidence › Trials · 16 Jan 2025 · 32 likes Something worth flagging about reading a supplementary appendix: the strongest-sounding claims in this thread are the ones with no source attached, which is the usual…
How compounding permissions changed when supply normalised Replied, post #3 · Sourcing › Regulatory · 25 Dec 2024 · 9 likes Understood, and I withdraw the assumption I opened with.
Research-use-only status: what it means legally and practically — a second dataset Replied, post #36 · Compounds › Other compounds · 9 Dec 2024 · 0 likes Solubility varies far more across this subcategory than within the incretins. A compound that needs a specific diluent or a specific pH is not being difficult; it has a…
What a seizure notice actually says Replied, post #13 · Sourcing › Logistics · 4 Dec 2024 · 0 likes Offering a way to settle seizure notice rather than another opinion about it. Two measurements, taken the same way, a fortnight apart. If the difference is within the…
When "no data" is the complete and final answer Replied, post #31 · Compounds › Other compounds · 30 Nov 2024 · 31 likes Second this, and I would have said it less carefully.
Fixed versus detachable needles: the trade-offs Replied, post #22 · Devices › Syringes & needles · 27 Nov 2024 · 0 likes Fixed versus detachable needles would be much easier to settle if anyone reported the denominator. Almost nobody reports the denominator.
Reading a preclinical wound-healing model and its relevance to a human tendon Replied, post #79 · Compounds › Repair & healing peptides · 17 Nov 2024 · 17 likes I read post #77 twice before replying, because I had assumed the opposite. On reading a preclinical wound-healing model I would separate what is worth knowing from what…
EMA product information as a primary source — does this still hold? Started this topic · Regional › European Union · 14 Nov 2024 · 5 likes The question in the title: EMA product information as a primary source — does this still hold? I will give what I have already checked below so nobody repeats it.…
Over-dilution: when your dose falls below one readable graduation Replied, post #7 · Practice › Reconstitution · 6 Nov 2024 · 15 likes Post #6 is the version of this I will quote in future. One addition. Choosing a concentration on purpose rather than by accident: starting with "I want to draw 0.5 mL…
Coming back to: Research-use-only labelling: what it means and what it does not Replied, post #2 · Sourcing › Regulatory · 5 Oct 2024 · 2 likes Narrowing the opening post, because the general version has more than one answer. My position on Research-use-only labelling is current rather than settled. I have…
Journal club: SURPASS-2 and the semaglutide 1 mg comparator Replied, post #54 · Evidence › Journal club · 25 Sep 2024 · 5 likes Post #52 is right about the mechanism and I think understates the practical bit. One more thing on SURPASS-2 that took me far too long to see: the two figures people…
Correlation in a self-tracked dataset: what it can support Replied, post #77 · Research Methods › Statistics · 23 Aug 2024 · 2 likes Narrowing post #74, because the general version has more than one answer. Effect sizes: the magnitude of a difference, not just whether it is statistically significant.…
Assessing a warm arrival: the decision process — one year on Replied, post #92 · Sourcing › Logistics · 1 Jun 2024 · 2 likes The reason Assessing a warm arrival is hard to answer is that the obvious measurement and the relevant quantity are not the same thing, and substituting one for the…