Alpha-GPC
Product
Focus during swims, cycled to avoid tolerance
"That and alpha GPC. If I take that combination, I am just dialed in and just swimming... Alpha GPC, I know Huberman talks about you have to cycle that. So that I will... You can build up a very quick tolerance to it."
More source quotes
Taken before workouts or cognitive work, about 4 days per week
"Indeed, I use these myself. The most effective one I've found is Alpha GPC. Alpha GPC consumed at dosages of 300 milligrams to 600 milligrams prior to a workout greatly increase one's ability to focus and concentrate."
Focus and cognitive enhancement, REM sleep improvement
"I am a big fan of alpha GPC — 600 milligrams or 900 milligrams of it. It increases choline which increases acetylcholine, which can increase your ability to focus. Rather than going straight to a prescription stimulant — alpha GPC gives you more REM sleep. ..."