There are main types of K2, MK4 and MK7. The difference in them is how long they stay in your body, put simply. I take MK4 at a dosage of 45 mgs a day. It’s in my Osteo K calcium from NBI. This is the dosage prescribed in Japan. The MK7 is dosed at up to 120 mcg, I think. You’ll have to look that up.