Plants are the “key factor” for existence of life as they regulate the biological cycles as well as synthesis their food by the process of photosynthesis. According to the oldest book “Rigveda” they also provide herbal formulation in many diseases in forms of leaves, stem, bark, root, flower extracts, powder, syrup, lotion, quath, bhasma, churna, rasayna etc in the treatment of many diseases like leucoderma, intestinal disorder, skin disease, leprocy, jaundice, syphilis, insect bite, facial paralysis, rheumatism and many type of cancer like liver cancer, stomach cancer, throat cancer, jaundice, piles, ulcer, rheumatism, swelling, chest pain, joint pain, migraine, blood dysentery, biliousness, fever and heart disease. Among the 10,000 already documented phytochemical constituents, almost 6000 compound present in plant derived food – fruits, vegetables, baverages and herbal medicine, due to their defence mechanism against radiation, virus, parasites and types of cancer-lung cancer, breast cancer, prostate and GIT cancer. Coloured fruits and vegetales are excellent source of beta-carotene, lutein, lycopene, minerals, flavonoids, anthocynidin. Green plants contain huge amount of chlorophyll and fiber, which improve the blood flow and lessen fat deposition in body and work as detoxifier and anticancer agents. Crucifereae and lilly families’ members contain large amount of sulphur compound, Indole- reduced the risk of breast cancer and detoxify the GIT, Glucosinolates prevent from colon cancer, Sulforaphane and indole-3-carbinol inhibit HPV, main cause of Womb cancer. Carotenoid, lycopene inhibit the growth of tumor, less the risk of breast, lung, prostate cancer. Limonoids work as chemoproective agents. “King of alkaloids” (wheat grass) contains chlorophyll, which is structurally similar of Hemoglobin and known as green blood. Iso-flavones and Genistein, it is closely related with human estrogen provide defense against cancer. Phytoconstituents posses protective and antioxidative nature due to presence of antioxidants, anthraquinone, anthocynidin, lycopene, lutein, carotene, minerals, various types of vitamins, flavonol, fibers, glycosides, sugars, amino acids, phenol and much more. Natural antioxidants are safe, effective, defensive, protective, less toxic or non-toxic and economically viable while synthetic antioxidants may be dangerous for health and expensive.