A calming extract of green tea, theanine, is gaining a significant reputation among nutritional practitioners for its positive effects on anxiety. Other benefits, which are attributed to green tea's antioxidant epigallocatechin gallate (EGCG), include assistance in the fight against cancer and heart disease.
L-Theanine has had significant clinical results for naturally calming and focusing the brain. The nutrient seems to help center a mind that is often running in several different directions. Research is still limited in humans, but small studies have pointed to some anti-anxiety effect as well [Source: Kimura, Lu]. Patients typically describe effects as mild, but helpful. The soothing quality may also benefit those who are not necessarily anxious, but can't relax the mind at night before sleep, and those with muscle tension in the neck.