The Bone Team Ortho•Bone contains key nutrients that are fundamental to maintaining bone health and preventing disorders like osteoporosis. MCHC (bone meal) is the most superior source of calcium available and prevents bone loss. Vitamin D is needed for calcium absorption. Vitamin K (menatetrenone) increases bone density and reduces the risk of bone fracture. Strontium helps bone building cells while reducing bone resorption. Important Extras Small doses of other nutrients are also important for bone health. Boron decreases calcium excretion. Magnesium is needed for a strong bone matrix. Manganese, zinc, copper and silicon have bone building abilities. Vitamin B12 and folic acid regulate homocysteine, which is toxic to protein fibers in the bone. The Right Balance Maintaining bone health involves much more than just calcium and requires a delicate balance of many essential nutrients. Ortho•Bone contains all the key ingredients at the appropriate doses to keep bones in optimal condition, and is also available in a vegan formula containing calcium citrate-malate.