Serenetea Camellia Sinensis contains the primary active compound catechin, which are one of the most common types of polyphenols — a large family of compounds with potent antioxidant properties. L-theanine is a non-protein amino acid derived from the tea plant. It is the most abundant amino acid in green tea, comprising about half of its amino acid content. It's also the compound behind tea's relaxing effect, which may help improve concentration and learning. Furthermore, L-theanine has anti-inflammatory and antioxidant effects and is associated with improved immune function.