In one study, researchers measured vitamin K in the diets of 11,319 men who were free of cancer when they enrolled. After 10 years of follow-up, men who had consumed the most vitamin K2 were 42 percent less likely to have developed prostate cancer compared to men who got the least vitamin K2.
Vitamin K, a powerful antioxidant, has two forms: K1 which comes primarily from plant sources and K2 from animal sources, such as aged cheeses.