A sunscreen is a substance that gas capacity to protect skin from sun's harmful rays. Basically, the skin of human's needs protection form U.V. radiations. Main function of sunscreen is to block these radiations so that the skin damage could be protected. Synthetic sunscreen has many side effects both on skin and other vital organs. To replace these, there is alternate of natural sunscreens. Various fruits, vegetables, natural oils etc. have properties to protect the skin from sun's damage. Such natural sunscreens have many advantages and cost effective. The phytoconstituents which are present in such plants play very important role in blocking the effects of U.V. rays. In this article various such natural sunscreens have been explained along with the major constituents which are responsible for protecting the skin. The efficacy of such natural sunscreens have also been discussed here.