c.correia

TL2 Moderator · 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 I read post #100 twice before replying, because I had assumed the opposite. No spam: introductions are not a place to advertise commercial products or services. That is…
[2026 update] Interpreting a result that disagrees with the supplier's certificate Replied, post #125 · Sourcing › Independent verification · 26 Jul 2026 · 2 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…
Follow-up: How compounding permissions changed when supply normalised Replied, post #65 · Sourcing › Regulatory · 24 Jul 2026 · 9 likes Off-label use and medical practice: clinicians can prescribe approved medications off-label under some circumstances. That is different from research-use-only…
Receptor desensitisation as a tolerance hypothesis, and its weak evidence Replied, post #49 · Pharmacology › Receptor biology · 19 Jul 2026 · 22 likes Bias and desensitisation: receptors can be biased (preferentially activating some downstream pathways over others) and can desensitise over time (responding less to the…
[2026 update] Interpreting a result that disagrees with the supplier's certificate Replied, post #100 · Sourcing › Independent verification · 17 Jul 2026 · 18 likes Janoshik Analytical: chromatographic purity and mass-spectrometric identity on submitted samples. Reports are issued with the analytical method stated and a…
Journal club: SUSTAIN 6 and its retinopathy signal Replied, post #44 · Evidence › Journal club · 10 Jul 2026 · 0 likes On post #40 — agreed on the reasoning, with one qualification. Critical appraisal template: (1) What did the trial set out to estimate? (2) Could the design answer that…
Does a peptide degrade silently, with no visual change? Replied, post #59 · Practice › Storage & stability · 30 Jun 2026 · 26 likes Vial integrity: once a vial is entered with a needle repeatedly, the rubber closure degrades and the integrity fails. Using the same vial repeatedly over weeks or…
Coming back to: Specificity, linearity, accuracy, precision, range, robustness — with… Replied, post #64 · Analytics › Method validation · 23 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…
How shortages have affected compounding permissions — does this still hold? Replied, post #12 · Access › Shortages · 12 Jun 2026 · 22 likes Dose hold versus tapering: if a temporary shortage forces a gap, holding your dose and resuming when supply returns is different from gradually tapering. The two are…
Follow-up: Search filters: what is missing Replied, post #125 · Meta › Site feedback · 10 Jun 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…
A reconstituted vial's beyond-use date and the reasoning behind common figures Replied, post #27 · Practice › Storage & stability · 3 Jun 2026 · 0 likes post #26 answers the question as asked. The question underneath it is different. Temperature excursions: if a vial sat at room temperature for a time, the question is…
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 post #75 answers the question as asked. The question underneath it is different. Blind submission is worth the effort: have someone else relabel the sample so neither…
Run-in periods and the population they select Replied, post #126 · Evidence › Trials · 29 May 2026 · 2 likes post #125 answers the question as asked. The question underneath it is different. Surrogate endpoints: an endpoint that is not the outcome that matters but is measured…
I have no scientific background — can I still follow the analytics categories? Replied, post #3 · Start Here › Welcome · 14 May 2026 · 32 likes Worth separating two things that the opening post runs together. There is no stupid-questions rule and no penalty for asking badly. The response to a poorly framed…
Micro-titration: a disputed topic, argued properly — one year on Replied, post #35 · Practice › Dosing & titration · 11 May 2026 · 1 like 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…
Reconstituting a multi-strength kit without mixing yourself up — what changed since Replied, post #12 · Practice › Reconstitution · 7 May 2026 · 0 likes post #11 answers the question as asked. The question underneath it is different. A 10 mg vial reconstituted three different ways: 1 mL diluent gives 10 mg/mL, 2 mL…
The best-written scientific paper you have read Replied, post #32 · Lounge › Off topic · 5 May 2026 · 0 likes Newer drugs and mechanisms: when a new drug launches or a new mechanism is discovered, the Lounge is a place to discuss the news and speculate before hard data exists.
Blind submission and why it changes minds — the long version Replied, post #36 · Sourcing › Independent verification · 22 Apr 2026 · 0 likes Janoshik Analytical: chromatographic purity and mass-spectrometric identity on submitted samples. Reports are issued with the analytical method stated and a…
A single out-of-range value on an otherwise normal panel Replied, post #37 · Clinical › Bloodwork · 21 Apr 2026 · 11 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…
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 Reversed-phase separates on hydrophobicity. A peptide is retained on a non-polar stationary phase and eluted by increasing organic solvent. For peptides the mobile…
[2026 update] Thyroid function tests during substantial weight change Replied, post #35 · Clinical › Bloodwork · 9 Apr 2026 · 2 likes Picking up post #32: 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…
A parcel stationary at a customs facility for nine days Replied, post #46 · Sourcing › Logistics · 7 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…
Measurement error in home scales, with a worked standard deviation — the long version Replied, post #61 · Research Methods › Statistics · 25 Mar 2026 · 0 likes Number needed to treat: how many people need to be treated to prevent one bad outcome or achieve one good outcome. More intuitive than relative risk reduction.
Coming back to: Time to steady state after a dose increase Replied, post #19 · Pharmacology › Pharmacokinetics · 23 Mar 2026 · 9 likes Hepatic metabolism: the degree to which each compound is hepatically metabolised versus renally cleared is known but varies. Severe liver disease changes clearance.
Micro-titration: a disputed topic, argued properly Replied, post #49 · Practice › Dosing & titration · 21 Mar 2026 · 10 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] Distinguishing expected GI effects from something that needs urgent… Replied, post #11 · Practice › Side effects · 19 Mar 2026 · 6 likes Recognition and grading: nausea ranges from "noticeable" to "limiting". Constipation ranges from mild to severe. Having language to describe the magnitude helps you…
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 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…
Second pass at: Metformin co-administration and additive GI effects Replied, post #65 · Practice › Interactions · 12 Mar 2026 · 26 likes Insulin interaction: semaglutide and tirzepatide are not contraindicated with insulin but the combination carries hypoglycemia risk if insulin doses are not adjusted.…
Second pass at: What pooling buys you and what it destroys Replied, post #26 · Evidence › Meta-analyses · 11 Mar 2026 · 0 likes I read post #24 twice before replying, because I had assumed the opposite. Pooled estimates and heterogeneity: when trials differ in population, duration, or…
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 Dose equivalence between different incretin analogues is a weak concept. The molecules differ in structure, half-life, receptor selectivity, and in what has been…
Second pass at: Identical chromatograms across two different lots Replied, post #15 · Sourcing › Red flags · 19 Feb 2026 · 13 likes Rapid supplier turnover: a supplier that changes corporate structure, domain name, or contact repeatedly in short time windows raises suspicion about stability and…
Interpreting a result that disagrees with the supplier's certificate Replied, post #122 · Sourcing › Independent verification · 14 Feb 2026 · 29 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…
The 2.5 mg starting dose is not a therapeutic dose — why that matters Replied, post #7 · marked as the solution · Compounds › Tirzepatide · 4 Feb 2026 · 11 likes 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…
Filter needles: when they help and what they cost you Replied, post #39 · Devices › Syringes & needles · 30 Jan 2026 · 0 likes Fixed versus detachable needles: insulin syringes usually have fixed needles (no dead volume loss to the hub). Luer-lock syringes use detachable needles (more dead…
Second pass at: Which categories are strict and which are relaxed, honestly Replied, post #2 · Start Here › Welcome · 13 Jan 2026 · 9 likes I read the opening post twice before replying, because I had assumed the opposite. Nothing here requires expertise. The experienced members here got that way by posting…
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 Gallbladder complications: rapid weight loss increases the risk of gallstone formation. The mechanism is not specific to this drug class. The risk is greatest in the…
Vomiting: when it is expected and when it is a reason to stop Replied, post #14 · Practice › Side effects · 26 Dec 2025 · 12 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…
Airline travel with a temperature-sensitive injectable Replied, post #23 · Devices › Cold chain · 17 Dec 2025 · 20 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…
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 logistics question, since the…
Second pass at: Programming during a large energy deficit Replied, post #78 · Nutrition & Training › Resistance training · 12 Nov 2025 · 19 likes post #77 answers the question as asked. The question underneath it is different. Frequency: three sessions per week of full-body training is easier to maintain than…
Revisiting: Why tirzepatide titration schedules have more steps than semaglutide's Replied, post #9 · Compounds › Tirzepatide · 6 Nov 2025 · 0 likes SURPASS-2 compared tirzepatide with semaglutide 1.0 mg, the licensed diabetes dose at that time. It did not compare with semaglutide 2.4 mg, the highest approved dose.…
Price changes over 2025 and 2026, tabulated and dated — does this still hold? Replied, post #2 · Access › Pricing · 18 Oct 2025 · 1 like Price variation between pharmacies: identical prescriptions can cost different amounts at different pharmacies because pharmacies negotiate individually with insurers…
Compounds this community declines to help with, and why Replied, post #52 · Compounds › Other compounds · 3 Oct 2025 · 10 likes I read post #50 twice before replying, because I had assumed the opposite. Research-use-only status is a legal classification, not a safety classification. It means the…
Pooling trials with different estimands — what changed since Replied, post #32 · Evidence › Meta-analyses · 3 Oct 2025 · 32 likes On post #28 — agreed on the reasoning, with one qualification. Two things before anyone answers the substance. First, the context in the first post is clear and…
A preprint whose numbers changed substantially at publication Replied, post #76 · Evidence › Preprints · 3 Oct 2025 · 23 likes Discussing preprints in this community: bring them in for early discussion, label them clearly as preprints, invite peer critique, and be prepared for the discussion to…
Request: a diff view for wiki revisions — the long version Replied, post #37 · Meta › Feature requests · 1 Sep 2025 · 10 likes Feature scope: some requests are for the site itself (search, filtering, navigation). Some are for the documentation (new topics, different formats). Scope helps…
Hepatic impairment and the absence of data Replied, post #8 · Clinical › Special populations · 7 Aug 2025 · 21 likes Medullary thyroid carcinoma history: an absolute contraindication because of the preclinical findings in rodent toxicology. The history (personal or family, especially…
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 have seen LEADER ( N Engl J Med ,…
How to read a forest plot, properly, from scratch Replied, post #9 · Evidence › Trials · 26 Jul 2025 · 10 likes I read post #7 twice before replying, because I had assumed the opposite. Having read the exchange above, I think I was wrong earlier in this topic and I want to say so…
Canadian access and provincial variation — one year on Replied, post #17 · Regional › North America · 22 Jul 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.
Second pass at: Triple agonism: additive, synergistic, or neither? Replied, post #82 · Compounds › Retatrutide · 20 Jul 2025 · 2 likes Glucagon receptor agonism seems paradoxical in a weight-loss compound because glucagon raises blood glucose. The paradox resolves because glucagon agonism also…
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 Context that matters: compound, how long in, current dose, relevant history. Context that does not matter: how you feel, your hopes for the outcome, your medical…
Insulin combinations and hypoglycaemia risk Replied, post #17 · Practice › Interactions · 22 Jun 2025 · 0 likes Sulfonylureas and meglitinides: these agents stimulate insulin release and carry hypoglycemia risk. Combining them with semaglutide or tirzepatide requires dose…
Retatrutide phase 2 in type 2 diabetes: the Lancet paper Replied, post #11 · Compounds › Retatrutide · 12 Jun 2025 · 31 likes Phase 2 sample sizes are not adequate for safety characterisation of a novel triple agonist. Phase 3 is where that question gets answered. Using phase 2 results to make…
Follow-up: What other technical communities get right that we do not Replied, post #124 · Lounge › Off topic · 8 Jun 2025 · 3 likes Science communication: if you come across an interesting science paper or article about peptides or metabolism, sharing it and discussing the idea is on-topic.
Follow-up: Tracking intake honestly when appetite is absent Replied, post #35 · Nutrition & Training › Protein & intake · 7 Jun 2025 · 19 likes Micronutrition alongside protein: eating protein foods that are also good sources of micronutrients (iron, B vitamins, zinc) solves two problems at once.
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 Worth separating two things that post #13 runs together. Potassium: similar to sodium; losing weight involves some potassium loss. Bananas, sweet potatoes, and other…
Retatrutide dose escalation in the published trials Replied, post #103 · Compounds › Retatrutide · 8 Apr 2025 · 0 likes I read post #101 twice before replying, because I had assumed the opposite. Practical note that does not fit anywhere else. Whatever you conclude from this topic, write…
Documenting a supplier's response to a discrepancy — does this still hold? Replied, post #39 · Sourcing › Vendor reports · 30 Mar 2025 · 1 like What "verified" means on our pages: specific lots were independently measured on stated dates by named services and results were consistent with the supplier's…
Charge states for a 4 kDa peptide, worked through Replied, post #20 · Analytics › Mass spectrometry · 4 Mar 2025 · 13 likes post #19 answers the question as asked. The question underneath it is different. Mass accuracy is expressed in parts per million. It is the difference between observed…
Consistent declarations and why they matter more than clever ones Replied, post #89 · Sourcing › Logistics · 26 Feb 2025 · 7 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…
Requesting a page: what makes a good request Replied, post #7 · Documentation › Wiki requests · 24 Feb 2025 · 3 likes I read post #5 twice before replying, because I had assumed the opposite. Translation suggestions: if a maintained page should exist in another language, suggesting it…
Coming back to: Official shortage notices and what they authorise Replied, post #11 · Access › Shortages · 10 Feb 2025 · 0 likes Picking up post #8: that is the part I would want checked first. Thank you for the correction. I have edited my earlier post with a note rather than silently, so the…
Why mass spectrometry cannot tell you about an epimer Replied, post #49 · Analytics › Mass spectrometry · 6 Feb 2025 · 0 likes Resolution: "high resolution" commonly means
[2026 update] Lipid changes during rapid weight loss: the expected trajectory Replied, post #38 · Clinical › Bloodwork · 31 Jan 2025 · 0 likes Worth separating two things that post #34 runs together. HbA1c and glucose: HbA1c reflects average glucose over months; a spot glucose measurement reflects the moment.…
Anxiety in the first weeks: drug, situation, or both Replied, post #44 · Wellbeing › Mental health · 30 Jan 2025 · 32 likes On post #40 — agreed on the reasoning, with one qualification. 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 Risk of bias: structured appraisal of internal validity. Key things to assess: randomisation method (was it truly random or could someone predict the next assignment),…
How compounding permissions changed when supply normalised Replied, post #3 · Sourcing › Regulatory · 25 Dec 2024 · 9 likes post #2 is right about the mechanism and I think understates the practical bit. Primary documents matter: regulatory positions are published in official documents.…
Research-use-only status: what it means legally and practically — a second dataset Replied, post #36 · Compounds › Other compounds · 9 Dec 2024 · 0 likes Research-use-only status is a legal classification, not a safety classification. It means the compound is sold for laboratory use and not for human consumption or…
What a seizure notice actually says Replied, post #13 · Sourcing › Logistics · 4 Dec 2024 · 0 likes Cold packs and temperature control: inclusion of cold packs at despatch is standard. Whether they maintain temperature through transit depends on journey duration and…
When "no data" is the complete and final answer Replied, post #31 · Compounds › Other compounds · 30 Nov 2024 · 31 likes Coming back to post #29, because the follow-up matters more than the original answer. Why catalogue breadth is not evidence of anything: a supplier listing 500…
Fixed versus detachable needles: the trade-offs Replied, post #22 · Devices › Syringes & needles · 27 Nov 2024 · 0 likes Fixed versus detachable needles: insulin syringes usually have fixed needles (no dead volume loss to the hub). Luer-lock syringes use detachable needles (more dead…
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 Coming back to post #77, because the follow-up matters more than the original answer. Reading a preclinical wound-healing model: the model shows whether a mechanism is…
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 answers the question as asked. The question underneath it is different. Foaming during reconstitution: bubbles in the solution are usually just air incorporated…
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 Picking up the opening post: that is the part I would want checked first. Compounding and pharmacy rules: some jurisdictions allow a pharmacy to compound a drug that is…
Journal club: SURPASS-2 and the semaglutide 1 mg comparator Replied, post #54 · Evidence › Journal club · 25 Sep 2024 · 5 likes Picking up post #51: that is the part I would want checked first. STEP 1 (N Engl J Med 2021): The pivotal obesity trial for semaglutide and the reference point for most…
Correlation in a self-tracked dataset: what it can support Replied, post #77 · Research Methods › Statistics · 23 Aug 2024 · 2 likes Picking up post #74: that is the part I would want checked first. P-values and significance: p
Assessing a warm arrival: the decision process — one year on Replied, post #92 · Sourcing › Logistics · 1 Jun 2024 · 2 likes Customs outcomes are not predictable at the level of an individual parcel. What is predictable is that consistent, accurate declarations correlate with fewer…