Check recommendations from COMB study ..also info on this on NIH website.
They used K2 (as MK7)with D3, magnesium, etc. Exercise.
Calcium was FOOD ONLY..no supplements. (The issue with heart etc)
The study is fascinating and easy to find. I did see several mentions of the study and each time the dosage was different, so you have to get relevant site.
Any pill you take goes thru your whole system.. not just popping into bones.. so you must do your research carefully, especially if you have issues other than osteoporosis.
Please research calcium carefully. It is a knee jerk recommendation, and there is a lot you need to know before you pop one of those! Vital.
The research on K2 with D3 is fascinating and a must read.
Good luck