Purchased some L-Theanine supplements today at whole foods. Each capsule contains about 100mg. L-Theanine is a naturally occurring amino acid. It is commonly found in Green Tea and is the explanation as to why the caffeine in green tea does not give you the same effect as coffee. L-Theanine counteracts the effects of caffeine and the jittery feeling you often feel. Calm and alert is what we are going for. L-Theanine is known to produce more Alpha brainwaves in humans. Synthetic theanine has been licensed for unlimited use in all foods (except infant food) in Japan since 1964. Basically when you see Suntheanine in products all it really means is it was synthetically extracted. Most experts would agree 1000mg is daily max for most people. 200-400mg being the most common dosage. There are a few drinks out that contain this powerful amino acid. Just Chill being the most popular, while a drink called Zenify is becoming my favorite because it contains 350mg, while Just chill contains 150mg. Benzodiazepines such as Xanax are highly physically addictive and and L-Theanine may help lowering your dosage or assisting with getting off them. Since L-Theanine has direct effects on your stress responses it will help with blood pressure, Theanine will increase GABA in the brain and could be taken with a GABA supplement. Check it out next you go shopping or are looking for a natural stress reliever.