While human clinical research on the health effects of noni (Morinda citrifolia) juice is lacking, ascribed benefits are attributed to noni juice’s antioxidant content, including iridoids and polyphenols from the coumarin, flavonoid and phenolic acid groups (1,2). Noni juice, similar to many fruit juices, contains some vitamins, minerals and antioxidants. The antioxidants may help to maintain good health but what antioxidants are present, how they exert their