The most common question asked by vitiligo patients in the outpatient clinic as well as the telephone consultation and website consultation is whether vitiligo needs to be avoided. A lot of patients or family members see a lot of vitiligo avoid vitamin C articles on the internet, so they pay special attention to this problem, and even long do not eat tomatoes, green vegetables, fruits and other foods rich in vitamin C. This view is wrong, vitiligo patients do not need to avoid vitamin C. Vitamin C is involved in the redox process of melanin synthesis within melanocytes, and it has a whitening effect internally, but the cause of vitiligo patients is not due to impaired melanin synthesis, but melanocyte destruction. Research now tends to suggest that oxidative stress is an important cause of melanocyte destruction, so as a good reducing agent, vitamin C may also be used to treat vitiligo.