This book responds to the urge to find, in a sole document, the impact of oxidative stress at distinct levels as well as treatment with antioxidants to react and decrease the damage. The contents of the book are grouped under two sections: cell biology, chemical free radicals & antioxidants and cell damage by oxidative stress. It is intended for health professionals, as researchers from across the world have contributed in it. The book is a collaborative effort for progressing towards the prevention and treatment of chronic degenerative diseases.