Hi Caroline, I am currently using the Life Extension product you mentioned. I like it because it has both MK4 and MK7 in it, and the dosage of MK7 is approximately the same as was used in a 3-year study that showed beneficial effects in bone health for the users. I can’t find a link for this study right now, but I’ll post it when I locate it. Essentially, if I'm remembering correctly, the study concluded that MK7 helps move calcium into your bones and keeps it out of your arteries.