Vitamin K is mainly used to promote blood coagulation, prevent osteoporosis, analgesia and other effects. 1. Promote blood coagulation: Vitamin K is an essential substance for the synthesis of coagulation factors II, VII, IX and X. It has the function of promoting the synthesis of plasminogen by the liver. When local tissue injury, vitamin K participates in the process of blood coagulation and promotes hemostasis. 2. Prevention of osteoporosis: Vitamin K participates in bone metabolism, regulates calcium deposition in bone matrix, improves bone structure, and is effective in the prevention of osteoporosis. 3. Analgesic: Vitamin K can be used to relieve spasms, such as bronchial tubes, bile ducts and other spasms caused by pain, play an analgesic role. The above is vitamin K as an essential nutrient to the human body plays a role, if the lack of vitamin K, it is recommended to seek medical advice, find the cause, symptomatic treatment, not unauthorized use of drugs.