Page 226 - Phytochemistry 2 (06-PG 605)

Fortunately, free radical formation is controllednaturally
by various beneficial compounds andantioxidants.

Antioxidants terminate oxidative chain reactions by

 removing free radical intermediates
 inhibit other oxidation reactions by being oxidized themselves.

Antioxidants are often reducing agents such asthiols,
ascorbic acid, or polyphenols.