Vitamin K and Natto - What's the Connection?

Natto is one of the richest sources of vitamin K2, which is important for bone and heart health. Although vitamin K was identified in the 1920s, right around the same time as vitamins C and E were discovered, it doesn't have anywhere near the name recognition as other nutrients. It was first identified by German researchers who discovered that it was essential for proper blood-clotting. The "K" stands for "koagulation."
Later, it was discovered that vitamin K also plays an important role in bone formation as well as heart health.