Theanine is an amino acid found in tea that has calming effects on your brain, by increasing levels of serotonin and dopamine and blocking the activation of glutamate receptors. Life Extension members can enjoy the benefits of this unique ingredient offered in a 100 mg supplement. This product causes no adverse reactions. The Japanese people add theanine to soft drinks and chewing gum to induce relaxation. The calming mood-enhancing effect is achieved by promoting electrical brain activity commonly present when you are very relaxed, which literally sets you in a better mood. Nowadays, the effect that theanine has on the brain is compared with meditation, massage and aromatherapy. What you can expect is relaxation and a sense of wellbeing. L-Theanine is a non-toxic, highly desirable mood regulator. Beware of Imitations: There are different forms of L-theanine. Suntheanine is the only pure form that is protected by internationally recognised patents and proven in clinical studies to be safe to use. Independent laboratory analysis have identified products on the market that claim to contain L-theanine. In reality, they are half L-theanine or D-theanine, forms that have not been empirically studied.