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Theanine is an amino acid present in the leaves of the tea shrub, Camellia sinensis. Theanine functions as a mild and non-sedating relaxant in the human body and can therefore help us relax and relieve anxiety. Theanine is also believed to enhance out mental focus and bring us a more restful sleep. Some sources even claim that theanine can reduce a high blood pressure and be helpful in cancer therapy, but these claims have not been verified by independent scientific studies.

The interesting thing about theanine is that this amino acid affects the alpha-waves in our brain. By increasing the amount of alpha-waves, theanine will make it easier for us to reach a state where we are relaxed and at ease without becoming tired or drowsy.

A person who produces plenty of alpha-waves will suffer from less anxiety. Scientific research has proved that elite athletes usually produce a massive amount of alpha-waves in the left part of their brain during their peak performances. Researchers have also been able to show how theanine can enhance learning performance in mice.

If you drink 3-4 cups of green tea you will typically ingest between 100 and 200 mg of theanine, but these amounts can be affected by a wide range of factors, including preparation method. According to clinical studies, you will need from 50 to 200 mg of theanine before you notice any effect. Keep in mind that theanine will reach its maximum levels in the blood stream 0.5-2 hours after ingestion. There is no known adverse side affects linked to a limited intake of theanine, i.e. a few cups of green tea a day. This means that a theanine rich tea is a safe way of combating stress and anxiety in our everyday lives. People who use other relaxing compounds, such as prescription drugs or herbals like valerian, will often experience an undesired drowsiness that makes it impossible or inappropriate for them to use the remedy at work or in other situations that requires attentiveness and an alert mind.