Fast&Up - Fortify (Calcium Supplements) provides you with the perfect combination of raw materials that are needed for optimal bone health. With this right combination of vitamins and minerals, Fast&Up Fortify provides you with a balanced approach for a complete bone Microarchitecture. Calcium is one of the main bone-forming minerals and 99% of the body's calcium resides in the skeleton. Magnesium in this product also works in tandem with Calcium in many physiological processes including: The contraction and relaxation of muscles. Low Magnesium levels are associated with an increased incidence of muscle cramps. Vitamin D3 often known as sunshine vitamin is also essential for the development and maintenance of bone for its role in assisting calcium absorption.