Domestic general recommendations for children’s vitamin D two weeks after birth can begin to supplement until about two weeks of age, vitamin D is fat-soluble, if the intake of food within the insufficient, you need to additionally supplement, in addition to children, pregnancy, breastfeeding women, middle-aged and elderly people, etc., the lack of vitamin D people also need to supplement. Specifically as follows: 1, infancy and early childhood growth and development is faster, if the lack of will cause rickets, poor dental development, growth retardation and so on. In addition to daily from the diet, supplemental vitamin D, but also more sun, ultraviolet radiation can also synthesize vitamin D. 2, pregnant women because of the rapid growth and development of the fetus, food intake is not enough, but also need to additionally supplement the vitamin. 3, middle-aged and elderly people if the lack of vitamin D will cause osteoporosis, in addition to sitting in the office all year round can not get the sun, the body of the lack of calcium, cramps and so on, also needs to be supplemented with vitamin D.