L-Theanine is a naturally occurring amino acid found in green tea, with the ability to cross the blood-brain barrier. Theanine has been shown to be responsible for the calmative effects of Green Tea, that are known to induce a relaxed but alert state. This resulting calmative state without sedation is what makes L-Theanine such a popular nootropic to combine with stimulants due to the "flow-state" that results. L-Theanine has been shown to assist with the following: Anxiety Focus Learning Mood Not only does L-Theanine have positive effects on stress levels, but has also been shown to have effects on the levels of both dopamine and serotonin in the brain. What's in the box Higher Health - L-Theanine 60 Capsules (30 Servings)