Aim for a supplement that provides at least 1000 IU of Vitamin D3 and 100 mcg of Vitamin K2 per serving, along with other bone-supporting nutrients like calcium and magnesium.

This fat-soluble vitamin helps the body absorb and use calcium and phosphorus ... Most over-the-counter vitamin D3 supplements contain dosages between 1000–5000 IU, but some are higher.