<span style="\\\\"color:" rgb(129,="" 129,="" 129);="" font-family:="" helvetica,="" arial,="" sans-serif;="" font-size:="" 14px;="" line-height:="" 22.6520004272461px;="" orphans:="" 3;="" widows:="" 3;\\\\"="">Just about every cell in the human body needs calcium. Calcium is a mineral that enables blood clotting; aids transmission of nerve impulses, and helps insure a regular heartbeat. The human body relies heavily on calcium to function properly. And, structurally, bones and teeth require calcium to stay strong and healthy… muscle cells too. Vitamin D is responsible for helping the body absorb and utilize calcium.