L-theanine is a naturally occurring amino acid found almost exclusively in tea leaves. It crosses the blood-brain barrier and modulates alpha-wave activity, the same brain rhythm associated with a relaxed but alert state.
Most of the calm-without-drowsiness claims you read about come from studies pairing L-theanine with caffeine.
L-theanine does not put you to sleep, it softens the transition. The heavier sleep-onset work in a DRIFT can is handled by glycine. L-theanine just smooths the edges of the day.
Ingredient · 1 min read · Updated 03.05.26
