The body of knowledge about plants, herbs and spices and their respective and collective roles in promoting human health is modest. Dietary compounds, their role in maintaining human health and their interactions with established nutrients need to be determined to be research priorities. A number of fruits and vegetables have been shown to actually combat the deleterious effects of metabolic oxidation generated naturally or by increasing pollutants in the environment. The plants that show good antioxidant activity include Allium cepa Onion, Allium sativum Garlic, Aloe camells Sinensis Green tea, Curcuma longa Turmeric, Emblica officinalis Amla, Glycyrrhiza glabra Licorice, Hemidesmus...
used in Ayurvedic system of medicine to improve the health of body. The oral administration of Rasayans protected mice from radiation induced leucopenia and reduced the formation of lipid peroxidase in liver as compared to controls. Pre-treatment of some antioxidants like curcumin, bixin, ellagic acid and alpha-tocopherol before exposure to gamma rays, significantly declined the serum and lipid peroxidase enzymes. Liv.52 a non-toxic herbal prepration has been reported to be clinically effective in treating hepato-toxicity and wide range of hepatic disorders of different etiology. Its hepato-protective role against irradiation and/or methylmercuric chloride MMC intoxication has also been demonstrated.