Highest potency helps maintain strong bones supports immune system now Vitamin D-3 soft gels supply this key vitamin in a highly-absorbable liquid soft gel form. Vitamin D is normally obtained from the diet or produced by the skin from the ultraviolet energy of the sun. However, it is not abundant in food. As more people avoid sun exposure, vitamin D supplementation becomes even more necessary to ensure that your body receives an adequate supply. Natural color variation may occur in this product.