Theanine is an amino acid found in tea and some mushrooms. It comes in two forms: L-theanine and D-theanine. L-theanine is the most common form.
Theanine is a naturally occurring amino acid - ideal for all workouts. Theanine might also affect the brain chemicals GABA, dopamine, and serotonin.
People use L-theanine to improve mental function. It is also used for anxiety, mental impairment, stress, and other conditions.
Getting theanine from your diet alone can be expensive and time consuming, hence we incorporated in Brain and Brawn Optimal Body Vegan Protein to provide added benefit to your daily workout routine.
Reference
https://www.webmd.com/vitamins/ai/ingredientmono-1053/theanine
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6836118/