AIDS IN THE ABSORPTION OF CALCIUM - Vitamin D3 helps with the absorption of calcium. D3 also helps to form and maintain healthy bones and teeth. IMMUNE HEALTH - Vitamin D has a remarkable role to play in your health, influencing nearly 3,000 of your 25,000 genes, and playing a critical role in your immune response AUTHENTICITY OF INGREDIENTS - We always use a pure form of each ingredient and all our ingredients are laboratory tested to ensure accurate identification so you can be assured we use real, authentic ingredients.