Vitamin C contributes to the formation of antibodies and collagen, tissue repair, the metabolism of phenylalanine, tyrosine and folic acid, the utilization of iron and carbohydrates, the synthesis of fats and proteins, Serotonin is hydroxylated to promote the absorption of non-heme iron. At the same time, vitamin C also has anti-free radicals and inhibits the formation of tyrosinase, thereby achieving whitening and spot-lightening effects.