Vitamin C is a common water-soluble vitamin, with the role and efficacy of antioxidant, prevent poisoning, help iron absorption, etc.. Vitamin C also has a role in skin whitening. 1, antioxidant: vitamin C can participate in redox reactions in the body, protect sulfhydryl groups, protect vitamin A, vitamin E, etc. from oxidation, with antioxidant effects; 2, prevent poisoning: vitamin C can deactivate heavy metal ions such as lead, benzene, and excrete them out of the body, which can prevent heavy metal poisoning; 3, help iron absorption: vitamin C can make red blood cells in red blood cells to reduce to hemoglobin, restoring its oxygen-carrying capacity and making iron easily absorbed by the intestine; 4, other: vitamin C has some other roles, such as promoting antibody formation, promoting tetrahydrofolate formation, maintaining sulfhydrylase activity, preventing scurvy and other effects and roles. In addition, vitamin C can promote the synthesis of collagen, can also remove free radicals in the body, inhibit melanin production, thus having a certain whitening effect on the skin. In daily life, you can eat more vegetables and fruits containing vitamin C, such as tomatoes, peppers, greens, oranges, tangerines, grapefruit, grapes, kiwis, etc., without taking daily agents containing vitamin C.