Calcium and vitamin D supplements improve bone density by delivering sufficient levels of minerals for building and repairing bones that may not be reached through diet alone, as stated by WebMD. Vitamin D and calcium supplements serve as protective bone building substances year-round, but prove especially beneficial during the winter months and in colder climates, where people do not receive vitamin D through sunlight exposure. Supplements add critical levels of both minerals to diets in people with special needs, such as endurance athletes and people with osteoporosis.
Calcium plays a pivotal role in building strong and dense bones. It helps children and young adults build adequate levels of bone mass during peak growth years, typically lasting from adolescence through the early 20s, and it maintains bone density in adults. Calcium deficiency may occur in anyone, but appears most often in Caucasians, older adults, women, people with small body sizes and people who do not perform physical activity.
The body does not produce calcium naturally, despite its role in maintaining bone, teeth and heart health, as noted by the Centers for Disease Control and Prevention. Therefore, dietary and supplemental intake proves crucial for obtaining adequate calcium levels. Since calcium and vitamin D work together to promote bone health, experts recommend taking supplements and multivitamins containing both minerals.