Now, vitamin K2 is popping up in social media circles with the promise that it will treat both heart disease and osteoporosis ...

It's also worth noting that low levels of vitamin K are common in newborn babies. On occasion, this can lead to serious bleeding, which is why infants often receive an injection of vitamin K ...

The supplement is a precursor to vitamin K, commonly found in leafy greens ... a rare condition that prevents muscle growth in infant boys. Those diagnosed rarely live beyond early childhood.