PrizMAG Magnesium Bisglycinate Plus Vitamin D3 & K2 (90). The same great pure magnesium bisglycinate as PrizMAG, but with added vitamins D3 and K2 for optimal bone, muscle and nervous system health.. Magnesium, Vitamin D3 and Vitamin K2 all work closely together in the body to ensure your calcium is placed in your bones.. This product binds to a glycine, which is an amino acid that is small enough to pass through your cell walls ensuring optimal absorption and efficiency. This product is easily tolerated by the bowels