Most important medicinal plant is use as source of food in the world. It is necessary to understand the detection as well as chemical activities and other biochemical activities of potential compounds in medicinal plants. Medicinal plants are used as a source of the medicinal because it contains proteins as well as carbohydrates and important minerals needed for the body. Medicinal plants also possess the several chemical compounds due to which major diseases have been treated with special treatment of medicinal plants as compared to their plants. The presence of antioxidants that are found in rich amount in the external part of medicinal plants also leads to the various benefits. Medicinal plants contain a variety of compounds that are principally active and work against the free radicals. Out of potentially active compounds in the medicinal plants, antioxidants are the most important of all the compounds. The presence of the compounds in the inner as well as the outer portion of the medicinal plants makes it make antioxidants against the free radicals. These are the flavonoids that are showing the overall activities in the medicinal plants responsible for the blockages of the free radicals.