1. Different meanings

Vitamin D3 is cholecalciferol, a type of vitamin D. 7-dehydrocholesterol generated after dehydrogenation of cholesterol can be formed into cholecystitis by ultraviolet irradiation. Calciferol, so the provitamin D of cholecalciferol is 7-dehydrocholesterol.

Vitamin AD is vitamins A and D.

2. Different functions

Vitamin D3 is used for the prevention and treatment of vitamin D deficiency, chronic hypocalcemia, hypophosphatemia, rickets and chronic renal insufficiency. Treatment of osteomalacia, familial hypophosphatemia and hypoparathyroidism. It can also be used to treat acute, chronic and potential post-operative tetany and idiopathic tetany.

Vitamin AD is suitable for vitamin AD deficiency, such as night blindness, ophthalmia sicca, rickets, rickets, etc.

3. Different synthesis

Vitamin D3 (cholecalciferol) is mainly synthesized by the human body itself. The human skin contains a kind of cholesterol, which becomes cholesterol after being exposed to sunlight. Vitamin D3.

Vitamin AD is a compound preparation, an over-the-counter drug.

Baidu Encyclopedia-Vitamin D3;

Baidu Encyclopedia-Vitamin AD