Quest Synergistic Calcium provides calcium and vitamin D which are needed for and contribute to the maintenance of normal bone, teeth and muscle function. As well as being a major structural component of bone, calcium also supports energy metabolism and the actions of digestive enzymes. Vitamin D, included as a synergistic nutrient, helps to maintain normal blood calcium levels and also helps to support immune function. The calcium in this product is chelated with amino acids for optimum absorption and utilisation.