d.ferreira

TL2 Moderator · Bochum

Contributes reviews on supplier material. Based in Bochum.

Joined 17 June 2025 · last posted 1d

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[2026 update] Detection wavelength and why 214 nm and 280 nm disagree Replied, post #74 · Analytics › HPLC & UHPLC · 27 Jul 2026 · 3 likes Method validation is the demonstration that a method can separate the compound from its degradation products and impurities reliably. A method that cannot resolve an…
What to bring: records that a clinician can actually use — a second dataset Replied, post #82 · Clinical › Prescriber conversations · 27 Jul 2026 · 1 like Questions about dose: asking "how will we determine whether this dose is working for me" gets at the monitoring plan. Asking "can we start lower" or "can we escalate…
GHRH analogues versus ghrelin mimetics: different mechanisms, conflated discussion Replied, post #53 · Compounds › Secretagogues & GH axis · 26 Jul 2026 · 12 likes I read post #51 twice before replying, because I had assumed the opposite. Evidence quality in the secretagogue literature is honestly weaker than in the incretin…
Why retatrutide discussion here is more cautious than elsewhere — one year on Replied, post #66 · Compounds › Retatrutide · 16 Jul 2026 · 12 likes How to read phase 2 without treating it as phase 3: phase 2 establishes that a dose range produces an effect and is tolerable enough to justify large trials. It does…
Immortal time bias in a claims-database study — one year on Replied, post #24 · Evidence › Study critique · 15 Jul 2026 · 11 likes Worth separating two things that post #20 runs together. Building consensus on which criticisms matter: if everyone agrees that the sample size is small but only you…
Submitting a sample: the process end to end Replied, post #76 · Sourcing › Independent verification · 12 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…
Heart failure with preserved ejection fraction: symptom endpoints Replied, post #18 · Clinical › Comorbidities · 8 Jul 2026 · 0 likes Bariatric surgery history: altered anatomy after surgery affects absorption. That matters for oral medications and for reconstituted solutions. Discussing specific…
How shortages have affected compounding permissions Replied, post #19 · Access › Shortages · 6 Jul 2026 · 32 likes Patient advocacy during shortages: some advocacy groups advocate for patients during shortages. Knowing who they are and following their communication is useful.
HbA1c lag and what it can and cannot tell you at eight weeks — one year on Replied, post #16 · Clinical › Bloodwork · 4 Jul 2026 · 0 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…
Personal or family history of medullary thyroid carcinoma Replied, post #32 · Safety › Contraindications · 30 Jun 2026 · 0 likes Concurrent insulin or sulfonylureas: not an absolute contraindication but requires dose adjustment and close monitoring for hypoglycemia. The combination is used with…
[2026 update] Travelling with an injectable: documentation and practicalities Replied, post #40 · Access › International · 27 Jun 2026 · 2 likes I read post #38 twice before replying, because I had assumed the opposite. Customs and import outcomes: different routes have different seizure rates. Some countries…
A reconstituted vial's beyond-use date and the reasoning behind common figures Replied, post #127 · Practice › Storage & stability · 10 Jun 2026 · 1 like Protecting from light: amber vials or opaque containers reduce light exposure. If you are storing for long periods and light matters, this is worth doing. For…