Vitamin K2 (both MK4 and MK7 version) available at Life Extension and D3 are both needed along with >1200mg calcium. I also eat prunes daily and follow the low oxalate diet as many foods we eat are loaded with oxalates (spinach is one) which stop the calcium from getting to our bones. If you look online for low oxalate foods, you should find several websites that list the oxalate content in foods. The one I like is from St. Josephs's Healthcare Hamilton. chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://www.stjoes.ca/patients-visitors/patient-education/patient-education-k-o/pd-9447-oxalate-in-food.pdf but there are several others.

The National Institutes of Health (nih) also did a study on a form of collagen called Fortibone and how it increases bone density after comparing dexa scans on individuals after being on it for 4 years. I am not getting paid for promoting Fortibone but I take it daily (Native Path Bone Health Collagen). It also helps with joint pain.
I also take Magnesium (citrate and glycinate as too much citrate can cause stomach pains) which is also needed for osteoporosis, and B12.