L-Theanine is a naturally occurring amino acid found in black and green tea. It has long been used to support a relaxed, calm mood. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease. Known for supporting a relaxed and calm mood, L-Theanine is an amino acid naturally found in black and green tea leaves.† Made from only the best ingredients, our L-Theanine provides you with 200 mg of this beneficial amino acid per serving.Known for supporting a relaxed and calm mood, L-Theanine is an amino acid naturally found in black and green tea leaves.† Made from only the best ingredients, our L-Theanine provides you with 200 mg of this beneficial amino acid per serving.