NOOTROPICS
GUIDE

Straight answers on nootropics, focus, and cognitive performance — backed by science.

01 L-Theanine: Calm Focus, Stress Support, and Cognitive Performance January 15, 2026 L-Theanine is a naturally occurring amino acid most commonly found in tea leaves, especially green tea. It has gained popularity in cognitive supplements and... L-Theanine: Calm Focus, Stress Support, and Cognitive Performance