The standard of vitamin intake mainly depends on which kind of vitamin, for example, like the standard of vitamin A intake, 800ug/d of retinol equivalent for men over 18 years old, and 700ug/d of retinol equivalent for women. The daily intake of vitamin B is 1.4mg/d for adult males and 1.2mg/d for females, and should be increased to 1.4mg/d for pregnant women in the middle of pregnancy, and to 1.5mg/d for late pregnancy and lactating mothers. In the case of vitamin C, the intake of vitamin C for adults is 100mg/d, which should be increased to 115mg/d in the middle or late pregnancy, and for lactating mothers, the standard daily intake of vitamin C should be increased to 150mg/d.