The medicinal values of plants have assumed a more significant dimension in past decades owing to the discovery that extracts from plants contain not only minerals and primary metabolites, but also an interesting array of secondary metabolites with antioxidant potentials. Antioxidants prevent the damage done to cells by free radical molecules that are released during the normal metabolic process of oxidation, which can lead to cancerous damages, accelerate the aging process and contribute to heart disease and degenerative diseases such as arthritis. Plant based antioxidants are now preferred to the synthetic ones because of safety concerns. This book, therefore provides, information about natural antioxidant plants in nature.