Antioxidant refers to a group of compounds that fights free radicals. To understand the primary responsibility of an antioxidant, you must first understand what a free radical is. A free radical is group of atoms or simply atoms that have an odd number of electrons and can form when oxygen interacts with certain molecules. Once this happens and a few free radicals form, a chain reaction occurs and they take over your immune system and other physiological functions and have a very negative effect on your body.

There are several different groups and substances categorized as being antioxidants. Most of the common ones are beta carotene, vitamin C, and vitamin E. There are also several minerals that function as antioxidants, including magnesium, zinc, and copper.

Many bodybuilders use antioxidants for their potential to enhance recovery from training or other athletic endeavors.