An amino acid found in tea, theanine (also known as L-theanine) is not essential for human nutrition. However, people take it in supplement form to treat a number of conditions, including:
Though generally well tolerated, theanine supplements aren't right for everyone. Before starting treatment with this product, check with your healthcare provider if you have any of the following health conditions:
- Kidney disease, such as kidney failure (renal failure)
- Liver disease, such as liver failure, cirrhosis, or hepatitis
- Any other serious or chronic health condition.
(For a more in-depth discussion on this supplement, including whether it is effective, click Theanine.)