Huberman has started taking Rhodiola Rosea prior to workouts, and found that he can push much harder and much longer through the workout.

He takes it at the same time as he takes Alpha GPC and says he’s impressed with it.

The benefits of Rhodiola Rosea include:

- Reducing physical fatigue
- Potentially enhancing memory and cognition

In Layne’s post on Instagram, he discusses dosage details, saying:

The Rhodiola extract should contain 3% rosavins and 1% salidroside. It’s best to take on an empty stomach, but not close to bedtime, due to its slight stimulant effect.

In terms of dosage, amounts as low as 50 mg have been found to reduce fatigue, with 680 mg being the suggested upper limit, due to a bell-curve effect.

This info on dosages appears to come directly from Examine.com’s Rhodiola page, which Layne credits at the bottom of the Instagram post.