"Vitamin D helps our bodies absorb calcium, which promotes bone health," says Bippen. Adds Jones, "Vitamin D and calcium are preventive sources to help lessen bone density loss and bone fractures."
Tasca, whose clients are mostly in their 50s or approaching 50, prefers to recommend a vitamin D supplement that includes vitamin K2. "The vitamin K2 added to vitamin D helps with the calcification of our bones and not our soft organs," Tasca explains.
Michelle Davenport, Ph.D., RD, finds that it's more important to have vitamin K and vitamin D3, instead of calcium, in a multivitamin.
"A lot of recent research shows that having supplements with too much calcium in it actually poses more of a heart risk, especially for women," says Davenport. "Vitamin K and vitamin D3 are two things that will help mobilize calcium instead of actually putting calcium into the body." Davenport notes that you should be able to get enough calcium from foods like broccoli, kale, and other cruciferous vegetables, as well as dairy and cheese.