F o o d ------------------------------------------------------------------------------------------------------------------------- Calcium-Definition Calcium is a soft, gray, metal mainly found in the hard part of your bones. The way calcium effects your body is to play a role in keep your bones and teeth strong and healthy. Vitamin A Vitamin A is important for your immune system, your vision, reproduction, your lungs, kidneys, and heart. Vitamin B Vitamin B helps keep your cells healthy and helps with DNA short for Deoxyribonucleic acid. Vitamin C Vitamin C plays a role in protecting your body cells. Vitamin D Your body must have Vitamin D to absorb calcium, promote bone growth, and other important body functions.