Results indicated that the mice that received an initial low dose of psilocybin of 5 mg/kg, followed by a monthly high dose of 15 mg/kg for 10 months, had a 30% increase in survival compared to mice who hadn’t received any.
So if we take a standard 80 kg adult male, 80 * 15 mg = 1.2 g, which sources indicate is enough for a standard trip. That’s also like almost half an ounce of dried mushrooms. Time to start tripping… for science.