Benefits of calcium 600 with vitamin D: Adequate calcium and vitamin D may reduce the risk of osteoporosis later in life Vitamin d assists in calcium absorption Non-gmo and gluten-free Calcium carbonate is a must for any woman over 40 to help safeguard bones. Calcium is difficult for your body to absorb. That's why we've combined it with vitamin D which helps boost your body's ability to absorb calcium. We use vitamin d3, also known as cholecalciferol. Vitamin d3 is the same form that occurs when sunlight hits your skin for 10–15 minutes. It's not derived from plant or fungal sources. Rather, it's derived from animal sources when 7-dehydrocholesterol reacts with UVB ultraviolet light. It is believed to be more effective at increasing the levels of vitamin D in the blood and is the form most utilized in clinical trials. These statements have not been evaluated by the food and drug administration. These products are not intended to diagnose, treat, or prevent any disease.