Is Theanine Bad for You?

Theanine, or L-theanine, is an amino acid that is found in the leaves of the tea plant. This amino acid is used as a nutritional health supplement and is added to many products in Japan with no known negative effects.

Health Effects

• According to Drugs.com, theanine is used to relieve stress and it has a relaxing effect without causing drowsiness. This amino acid may boost the body’s immune system and fight infections.

Food Uses

• A synthetic version of L-theanine is added to many food products in Japan including chocolate, herb teas and soft drinks.

Other Uses

• L-theanine has been added to cosmetics because of its moisturizing effect on the skin.

Women

• Theanine use has not been studied in pregnant women and breastfeeding mothers. Women who are nursing or pregnant should discuss theanine use with a doctor.

Negative Effects

• Side effects have not been reported with L-theanine consumption and this amino acid has not been found to be toxic to humans.