Ultimate Bone Builder by Ethical Nutrients 220 Tablet Bone Builder Ultimate 220 ct MCHC with Glucosamine Sulfate and Ipriflavone Bone Builder Ultimate provides the same calcium-rich MCHC found in original Bone Builder but with additional nutritional factors to help maintain healthy bone density. Bone Builder Ultimate also features glucosamine sulfate to support joint health Features ipriflavone a unique isoflavone derivative that helps promote healthy bone metabolism. Glucosamine sulfate is a natural compound that helps to support joint and connective tissue health. With more than one-half of the total body stores found in bone tissue magnesium has been shown to play an important role in bone metabolism. Boron is a trace mineral that may support bone health through its involvement in vitamin D and estrogen metabolism. Vitamin D is an essential nutrient that helps stimulate calcium absorption and regulate calcium and phosphorus levels in the body.