Mason Natural Fast Absorption Calcium with Vitamin D3 - Strengthens Muscle Function, Supports Healthy Bones and Overall Health, 60 Softgels Calcium combined with Vitamin D3 is a convenient way to get the best bone health benefits together in one easy supplement. Calcium works together with mineral nutrients such as magnesium to create bonds that form our bone matrix. This unique structure allows bones to be incredibly strong yet also flexible and resilient. Vitamin D3 plays an important role in bone health as it may support a healthy alignment between the two minerals since it can help move excess calcium into bones. Recognizing the essential role of calcium in bone health, the FDA has even approved the use of calcium supplements.