Diabetic patients need to clarify which vitamins they are deficient in through laboratory tests, and then supplement accordingly. It is not recommended to supplement blindly on one’s own, and one should pay attention to a balanced diet on a daily basis. Diabetic patients who want to know what kind of vitamins they lack can undergo a nutritional assessment under the guidance of a doctor, and take the appropriate amount of supplementation according to the results. An appropriate and balanced intake of vitamins is beneficial to diabetics in correcting metabolic disorders and preventing complications. However, it is not recommended for diabetic patients to blindly take vitamin supplements on their own or to take long-term, large-volume vitamin supplements. Diabetic patients can also take vitamin supplements through diet on a daily basis. The main source of vitamin C is fresh fruits and vegetables. Foods rich in vitamin D include lean meat, fish, milk and eggs. Foods rich in vitamin E include vegetable oils and nuts. It is recommended to consult your doctor for more details.