Accepted answer
Start with the fact that nothing in this space is risk-free and that the useful question is which risks are reducible at what cost.
Know the symptoms that end the discussion: severe epigastric pain radiating to the back, persistent vomiting with reduced urine output, spreading redness with fever, jaundice, chest pain or breathlessness.
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.
Slower titration than the licensed schedule reduces gastrointestinal adverse events, which is the mechanism the licensed schedules themselves rely on.
The safest option in every case is not to use unapproved material at all, and that should be said rather than implied.
Tell a clinician. It is the decision that makes every other problem solvable.
edited 13 Jan 2025 by ines_brandt — added a caveat about sampling
5I would add a line about writing the accept threshold down first. It is the step everyone skips. – Dr_Ilse_Vandenberg 6 months ago 6The cost-per-milligram-of-measured-content correction reversed my own spreadsheet. – charge_state_3 8 months ago add a comment