There is a lot of back and forth about K1. I take K2 because there are some good studies suggesting at high doses, it is better for bone health and cardiovascular health. Vitamin K research is sloppy, though, and there is no real answer whether K1 or K2 is better conclusively. K1 is from food intake. K2 is converted from K1 by bacteria in the intestines, so my reasoning was that was less likely to happen in us, so K2 supplementation might be more important. K1 is in my multivitamin at a low dose. I take K2 in high doses and it is one of the most expensive vitamins I take. It is one of those things I feel like a lab rat, since I can't find a single clear answer. I probably should take both.
