Natural skin is black because there are many melanin in the body. To decompose melanin, I mainly rely on vitamin C, so my skin is darker. I usually eat some natural vitamin C in health products, and then use whitening cosmetics. People who stay in front of the computer for a long time will also be darker. The vitamin C content of tomatoes in vegetables is high, and there should be many fruits. Kiwi is good. Drinking green tea is better.