Theanine is an natural amino acid and science shows that it assists with the calming effects on the brain. This is achieved by increasing the levels of serotonin and dopamine in your brain. It is often used in weight control products and naturally provides a relief from anxiety and stress.
For the most part, it is a relaxing but not sedating supplement that works well with stimulants such as caffeine. In addition, it has been shown to be effective by itself in normal supplemental dosages. Although it can be found in green tea it is added to Revital U to enable all the coffee drinkers to get the same great benefits.