Compare vs. Caltrate 600 + D3 (Caltrate is a registered trademark of Wyeth Holdings LLC). Bone health. May support strong healthy bones. High levels of vitamin D3 may help maximize calcium absorption. Adequate calcium as part of a healthful diet, along with physical activity, may reduce the risk of osteoporosis in later life. Vitamin D3 may help the body absorb calcium and is known for its beneficial effects on strong healthy bones. Tablet color may vary.