One of the most important minerals required is calcium for bone and teeth development. As children get older, calcium continues to be crucial for maintaining, developing, and reducing the risk of osteoporosis later in life. Magnesium helps to increase calcium absorption. Beyond bones, magnesium is crucial for muscle and nerve function and a deficiency has been linked to ADD (attention deficit disorder) and ADHD (Attention deficit hyperactivity disorder). Vitamin D provides similar benefits as magnesium but also helps to build bone mass in children.