#1 Pharmacist Recommended‡ Dietary Supplement - USP Verified D3 is the Body's Preferred Form of Vitamin D♦ Vitamin D Supplement Supports Bone, Teeth, Muscle and Immune Health No Color Added No Artificial Flavors No Yeast Gluten Free Vitamin D supports bone, teeth, muscle and Immune Health. ♦Vitamin D is more effective at raising and maintaining adequate levels of circulating vitamin D in the body. ‡Based on Pharmacy Times Survey of pharmacists recommending Letter Vitamin Supplements.