n.any of a group of organic substances essential in small quantities to normal metabolism

Vitamins E and C, beta-carotene, and other carotenoids as antioxidants
VITamins And Lifestyle Cohort Study: Study Design and Characteristics of Supplement Users
Antioxidant functions of vitamins. Vitamins E and C, beta-carotene, and other carotenoids.
Vitamins E and C in the prevention of cardiovascular disease in men: the Physicians' Health Study II randomized controlled trial
Use of antioxidant vitamins for the prevention of cardiovascular disease: meta-analysis of randomised trials.
The SU.VI.MAX Study: a randomized, placebo-controlled trial of the health effects of antioxidant vitamins and minerals.
Paradoxical effects of green tea (Camellia sinensis) and antioxidant vitamins in diabetic rats: improved retinopathy and renal mitoc...
A Randomized, Placebo-Controlled, Clinical Trial of High-Dose Supplementation With Vitamins C and E, Beta Carotene, and Zinc for Age...
Antioxidant Supplementation in Atherosclerosis Prevention (ASAP) study: a randomized trial of the effect of vitamins E and C on 3‐y...
A randomized, placebo-controlled, clinical trial of high-dose supplementation with vitamins C and E, beta carotene, and zinc for age...