Calcium gives bones their structure and strength, while vitamin D helps your body absorb it. Together, these nutrients build strong bones, improve absorption and reduce the risk of osteoporosis and fractures. 

In a recent Verywell Health article, registered dietitian Natalie Allen explains why this pairing is important and how supplements can help when food and sunlight aren’t enough. 

Allen is also a clinical associate professor of nutrition and dietetics in the School of Health Sciences at Missouri State University.