Vitamin D3 SAP 2500Vitamin D (2500 IU) for optimal health (based on science) In recent years, the importance of vitamin D has been extensively researched and proven to be an essential vitamin for overall human health. It was once thought that a deficiency would only impact the skeletal system, manifesting as rickets or osteomalacia. However, it has emerged that a suboptimal level of serum hydroxyvitamin D, known as insufficiency, may contribute to a multitude of disease