Solaray Calcium with D3 Citrate 1000 mg is a dietary supplement that provides a combination of calcium and vitamin D3 in citrate form. Calcium is essential for maintaining healthy bones and teeth, as well as for muscle and nerve function. Vitamin D3 helps the body absorb and utilize calcium. This product is used to supplement daily calcium and vitamin D3 intake, especially in people who are deficient in these nutrients or who need a higher intake due to age, diet, or health conditions