Vitamin D3 and calcium tablets can be taken together. Vitamin D3 is a kind of vitamin D, can be used for the prevention and treatment of vitamin D deficiency, such as chronic hypocalcemia, rickets and osteochondrosis with chronic renal insufficiency. Common calcium tablets are calcium carbonate, mainly used for the prevention and treatment of calcium but anyway, such as hand-foot tetany, bone dysplasia, menopausal women, calcium supplementation for the elderly. Vitamin D and calcium are both substances needed to maintain the normal physiological function of the human body, and vitamin D can participate in the body’s calcium and phosphorus metabolism, promote the absorption of calcium and phosphorus, so vitamin D3 and calcium tablets can be taken together. Clinically, there are compound preparations composed of calcium carbonate and vitamin D3, which are mainly suitable for calcium supplements and prevention of osteoporosis in adults. Both vitamin D3 and calcium tablets should be used under doctor’s supervision to avoid causing excessive blood calcium and phosphorus levels and toxic reactions. In addition, vitamin D3 can be supplemented by eating more foods rich in vitamin D, such as egg yolks, tuna, etc. More sun exposure is also useful for vitamin D supplementation.