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L-theanine is a unique amino acid that is gaining popularity as a natural way to promote healthy relaxation without any drowsiness. It’s derived from green tea leaves—yet another benefit of green tea — and has enjoyed extensive research, which has been demonstrating its relaxation potential. Researchers have discovered that L-theanine is able to enhance your body’s natural endocrine function, stimulating specific brain waves that support mental calmness and relaxation, while leaving other brain waves—seemingly the ones that would otherwise produce feelings of drowsiness—unaffected. Not convinced? Check out the customer reviews and see what others are really saying about L-theanine.