Vitamin D3 is an essential nutrient that works with Calcium to help develop strong bones and teeth, and is more potent and active form compared to Vitamin D2.* This high-potency Vitamin D supplement also assists in maintaining breast health and a healthy immune system. A recent analysis of 5 studies concluded that increasing Vitamin D intake could promote colon health. While lack of exposure to sunlight may reduce Vitamin D levels in the body, especially in the winter, it may be important to supplement in order to contribute to your overall Vitamin D intake.