Apparently if you are taking Vitamin D, you also need to take Vitamin K in order to avoid arterial calcification. I am discovering there are multiple types of Vitamin K.
"I take K2 both MK4 & MK7. Not for any effect on PCa but for getting calcium out of the blood and in to the bone. Bone thinning is a common long term SE of ADT and good calcium management is required. " kaptank
"K2 comes in 2 forms, menaquinone 4 and menaquinone 7. Opinion seems to be divided as to which is better and for what purpose. (eg cardiovascular vs bone health) I think most medicos who look at this will recomend M7 on its cardio credentials while M4 seems to be better at calcium transport but the 2 are so inter related that I reckon take them both. A bottle labelled "Vitamin K" can carry a number of forms, some of which are not desireable, so always examine the label." kaptank
"As best I know, K1 is OK but no substitute for the K2 forms. K3 is to be avoided." kaptank
I have found two types of Vitamin K pills at Life Extension.
1. Super K Elite - contains K1 along with four forms of vitamin K2 (MK-4, MK-6, MK-7, and MK-9). This makes Super K Elite our most complete vitamin K supplement ever.
lifeextension.com/Vitamins-...
2. Super K - Super K provides THREE kinds of vitamin K: vitamin K1 and two unique forms of K2, menaquinone-4 (MK-4) and menaquinone-7 (MK-7).
lifeextension.com/Vitamins-...
What kind of Vitamin K do you take and why?