Innovative Quality Since 1932 Dietary Supplement Clear Quality Discussions: KAL Ultra D-3 is high potency formula providing 5,000 IU of natural Vitamin D-3 per sugarless chewable. Vitamin D is essential for the proper formation of the skeleton and for mineral homeostasis. Supplementation may be helpful for those with limited exposure to sunlight. Each chewable is a delicious natural peppermint flavor.