Osteoplex Bone Health Complex | Biocare (90). Osteoplex is a combination of magnesium and calcium in their bioavailable citrate form with boron and vitamins D & K. Vitamins K, D, calcium and magnesium contribute to maintenance of normal bones.. Vitamin D and calcium are needed for the maintenance of normal bones and teeth. Magnesium contributes to normal muscle function and the maintenance of normal teeth. Vitamin D contributes to normal absorption/utilisation of calcium and phosphorus. Vitamin K & calcium contributes to normal blood clotting. Vitamin K & magnesium contribute to the maintenance of normal bones. Magnesium contributes to normal protein synthesis. Magnesium contributes to normal psychological function. Vitamin D contributes to the maintenance of normal muscle function. Citrates require little acidification prior to absorption