Catechin, a cyclooxygenase-1 (COX-1) inhibitor with an IC50 of 1.4 μM, which has antiangiogenic, antitumor, antioxidant, UV-protective, anti-aging, phytotoxic, antimicrobial, and antiviral effects. Catechin shows its potential as biobased active packaging for fatty food, and exerts cardioprotection through treating many kinds of angiocardiopathy. (+)-catechin is the (+)-enantiomer of catechin and a polyphenolic antioxidant plant metabolite. It has a role as an antioxidant and a plant metabolite. It is an enantiomer of a (-)-catechin.