Theanine

Theanine or L-theanine is an amino acid found in green tea that is sometimes taken as a herbal or alternative medicine.

Uses
Theanine is has suggested for:
 * Anxiety
 * Brain fog, particularly in combination with caffeine
 * Improving response to conventional cancer treatment or reducing cancer treatment side effects
 * Depression
 * Insomnia

Evidence
Evidence is limited for most suggested uses and some trials have reported no benefits or mixed results.

Learn more

 * L-theanine - Memorial Sloan-Kettering Cancer Center