Dose: 3–6 mg/kg of body mass. For a 80 kg person, that’s 240–480 mg (roughly 2–4 cups of coffee).
FWIW, in https://mennohenselmans.com/online-pt-course/ i learned that 3mg/kg/day is the upper end. good for occasional use (e.g. competitions, record attempts, etc). For normal training, we were taught that about 100mg or 1mg/kg/day is more appropriate. there were a bunch of cited studies, i would need to dig them up if you're interested. another reason for this is also that side-effects like impact on cognition, tolerance and anxiety start to manifest with chronic use.
FWIW, in https://mennohenselmans.com/online-pt-course/ i learned that 3mg/kg/day is the upper end. good for occasional use (e.g. competitions, record attempts, etc). For normal training, we were taught that about 100mg or 1mg/kg/day is more appropriate. there were a bunch of cited studies, i would need to dig them up if you're interested. another reason for this is also that side-effects like impact on cognition, tolerance and anxiety start to manifest with chronic use.