USANA MagneCal D. Your bones, muscles, and nerves work in tandem to keep your body aligned and moving. The calcium and magnesium in MagneCal D facilitate the electrical signals that tell your muscles to expand and contract, supporting these systems for smoother movement. You live an active life. Make sure to support your bones, muscles, and nerves with MagneCal D. It’s the perfect balance of magnesium and calcium fortified with vitamin D to keep you leaping forward to each new adventure.