Vitamin K2 for children is usually taken for a long period of time. The main effect of vitamin K2 is to promote the deposition of calcium in the blood to the bones, but also can enhance the detoxification function of the liver, to achieve the purpose of diuretic, to reduce body swelling. And appropriate supplementation of vitamin K2 can also be effective in the prevention or treatment of osteoporosis, this kind of drug side effects are relatively small, can be taken for a long time. Vitamin K is also a water-soluble vitamin, into the human body can also promote collagen regeneration, promote collagen synthesis, accelerate the body’s metabolism, in the long-term process of medication can effectively regulate the body, and will not affect the health of the body. If children need long-term supplementation of vitamin K2, it is recommended that they be observed regularly, and if there is any adverse reaction, the doctor should be informed in time. Antibiotics are prohibited during the medication period to avoid affecting the absorption of the drug.