Discover how free radicals damage your cells and cause heart disease, cancer, and aging. Learn which antioxidants protect your health.

Medically reviewed by Marla Anderson, MD Free radicals are highly reactive and unstable molecules that are made by the body naturally as a byproduct of normal metabolism. Free radicals can also be ...

Oxidative stress is an imbalance of free radicals and antioxidants that can negatively affect your cells and tissues. Experts explain how to reduce it.

Free radical chemistry centres on the study of species that possess one or more unpaired electrons – a feature that confers unique reactivity and diverse roles across chemical and biological ...

Radical enzymes represent an important class of biocatalysts that generate extremely unstable molecules—called free radicals—to enable a wide range of biochemical reactions.