Vitamin K contributes to the maintenance of normal bones and the Vitamin K2 form stays in the blood for longer than Vitamin K1 meaning that the reserves in the body can increase allowing the constant suply to tissues. It also contributes to normal blood clotting and unlike Vitamin K1, is safe to take with blood thinning medication , at the suggested in take.
An excellent food source of Vitamin K2 is natto (fermented soya beans) not a common Western dietary choice. Cheese and curd are also good sources, but people following a heart-health diet are recommended to reduce such foods in their diet, and they are usually high in salt. Higher Nature sources their Vitamin K2 from natto.
As Vitamin K is so important for bone health it makes sense to take this as part of your daily supplementation programme especially if you are postmenopausal.