Leeosteo,
There is a difference between the K vitamins. Vitamin K1 works differently from vitamin K2 which is suppose to direct calcium from your arteries to your bones. My husband takes Life Extension brand, but it is also available at Walmart by Spring Valley.

K2 is found naturally in grass fed cow milk and also in natto (fermented soy). Vitamin K1 has the clotting function.

I am not a medical expert, but my husband is a heart patient with a history of heart attack and V-tachycardia. Both his cardiologists have okayed this add to his supplement list.

But, yes, you should clear this with your doctor.