I routinely use 300 to 600 milligrams of alpha-GPC prior to hard physical training, typically weight training. But occasionally I'll take 300 milligrams prior to a mental work bout. There's not much human exercise performance data on those sorts of compounds. They are not stimulants, but they can be performance enhancing. And so you least like mentally, you're more likely to be alert and focused... despite the fact that we didn't change fuel.

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