Here's an interesting post by Stephan about "Activator X". Weston Price, author of Nutrition and Physical Degeneration, belived that a combination of Vitamins A, D, and the mysterious Activator X was largely responsible for the excellent health in primitive societies. It is now believed that Activator X is Vitamin K2.
The original article about the discovery of Activator X is here. The article was compelling enough for me that I picked up some Vitamin K2 supplements at the store yesterday. We'll see what effect it has.
