Free radicals are extremely unstable and highly destructive oxygen molecules.
Free radicals attack, damage, and ultimately destroy almost any material. The rusting of metal, the browning of a fresh cut apple, or the hardening of paint are all examples of the constant bombardment of free radicals and the resultant damage. In the body, their attacks are even more devastating. Free radicals may actually be your worst enemy. They can degrade collagen and even reprogram DNA and change the way your cells replicate themselves.