Vitamin D is a fat soluble vitamin that plays an essential role in enhancing the immune system. It helps regulate the absorption and utilization of calcium and phosphorous in the body and plays a crucial function in bone formation and mineralization to help the development of strong healthy bones and teeth. Vitamin D3 Spray may be of benefit to; People who wish to maintain strong healthy bones. Those who do not have enough exposure to sunlight. Elderly people who are more prone to bone disorders. Elderly and growing children who may not be able to obtain adequate amount of the vitamin D. People with a darker skin tone.