Solgar® L-Theanine 150 mg contains the non-dietary amino acid and natural phytochemical L-Theanine. Many people turn to a comforting cup of tea when we’re feeling anxious or stressed. This may be due to L-Theanine, an amino acid that is commonly found in green tea. It was discovered as a constituent of green tea in 1949 and in 1950 was isolated from gyokuro leaves. It is also the L-Theanine that provides a unique savoury (umami) flavour to green tea infusions. L-Theanine is an amino acid. Amino acids are classified as the building blocks of protein and are needed in several internal functions of the body. They are generally classified as “essential” or “non-essential”, with essential amino acids meaning they cannot be manufactured by the body and must be supplied in the diet to maintain good all-round health. L-Theanine however does not fall within either the essential or non-essential categories because it is not common in the diet and cannot be made by the body. It has a chemical structure similar to a neurotransmitter type of amino acid, glutamine, which naturally occurs in the body. L-Theanine is able to cross the blood brain barrier and support brain wave activity. Solgar L-Theanine is a free form amino acid which is an ideal natural, supplement to support you when life gets busy and stressful. L-Theanine helps support and encourages a calm, relax mood and wellbeing and works in conjunction with a neurotransmitter GABA (gamma aminobutyric acid). GABA is an inhibitory neurotransmitter important for nervous system function. L-Theanine may also support good sleep quality, focus, alertness and support learning. Solgar uses patented L-Theanine as Suntheanine® to promote optimal absorption and assimilation. Solgar® L-Theanine 150 mg is to be taken twice daily, 1 capsule, and comes in an easy to absorb vegetable form.