AD and D3 can't be eaten together, because AD is Yikexin, mostly vitamin D3, and the main component of vitamin D3 is D3. These two ingredients have the same effect, so AD and D3 should not be eaten together. If eaten together, it will cause vitamin D poisoning, and vitamins AD and D3 can be selectively supplemented. Both of these drugs promote the absorption of calcium and supplement vitamin D, so you can only choose one, and you can't take both drugs at the same time. In addition, besides eating AD and D3, there are many foods containing D3, such as liver, lean meat and egg yolk. If possible, the climate is suitable for children to bask in the sun for half an hour every day. Outdoor sunbathing also helps to absorb vitamin D, which is beneficial to development.