Nature's Way's L-Theanine is a dietary. stress-relieving supplement. It uses a patented form of L-Theanine. called Suntheanine. that is a relaxation supplement clinically proven to reduce stress. L-Theanine provides the L-Theanine amino acid. in veg capsule form. for natural stress management that is free of side effects. The L-Theanine caps act as a natural calming agent that eases your anxieties and leaves your body rested and relaxed; however. your daytime alertness will not decrease. so you'll be able to stay focused and productive throughout the day. After taken. L-Theanine will continue to promote relaxation and well-being during your day.