Expert Position
Stanford neuroscientist, host of the Huberman Lab podcast
Andrew Huberman recommends 1-3 milligrams of caffeine per kilogram of body weight, which for a 100kg adult is 100-300mg. His better-known rule is timing: delay caffeine 90-120 minutes after waking so it does not blunt the natural morning cortisol pulse and cause an afternoon crash.
“So for most people, ingesting 1 to 3 milligrams of caffeine per kilogram of body weight is going to be the range in which caffeine can have positive effects without making us feel overly anxious”
Andrew Huberman · watch @ 45:54 →
2 of the other 4 experts also take a positive position on Caffeine.
1 to 3 milligrams per kilogram of body weight. He works the example on air: at 100kg that is 100-300mg of caffeine, and he notes lighter people belong nearer 50-150mg.
To let the natural morning cortisol pulse run its course. Drinking caffeine immediately on waking blunts it, and he links that to the afternoon crash people then blame on lunch.
He describes caffeine before exercise increasing dopamine release, and caffeine taken after a learning bout enhancing memory consolidation — an after-the-fact use most people miss.