Vitamin D supplementation is necessary for seniors. Vitamin D supplementation for the elderly has certain benefits. From a medical point of view, a reasonable amount of vitamin D can effectively promote the body of the elderly for the absorption of calcium, reduce osteoporosis, so as to maintain the vitality of the body’s muscles and bones, and improve the stability of the body. Therefore, for the elderly, especially osteoporosis patients need to supplement vitamin D. In the human body, vitamin D can participate in the body’s immune regulation, so supplementation of vitamin D can make rheumatoid, lupus erythematosus, arthritis and other conditions become more stable. Although vitamin D has certain benefits, but need to pay attention to vitamin D can not replace the drug treatment, it is recommended that patients in the doctor’s standardized guidance under the guidance of medication and other treatments.