The short version: independent testing, conservative titration, sterile-ish technique, a written record and a clinician who knows.
Material risk is reduced by independent testing: identity, purity and quantified content on your own lot, before committing to a larger order. That is the only step that addresses what is actually in the vial.
Keep a written log: date, dose, lot, site, and anything noticed. It converts an anecdote into a record and is what makes any later consultation productive.
Start lower and go slower than the label. Time costs nothing here.
edited 12 May 2026 by anja_hellstrom — clarified the distinction between purity and content
Adding for future readers: ask for the lot-specific certificate before ordering, not after. – tobias_maartens 42 days ago add a comment