Everyday Value #1 Pharmacist Recommended‡ Dietary Supplement - USP Verified D3 is the Body's Preferred Form of Vitamin D^ Supports Bone, Teeth, Muscle, and Immune Health Vitamin D Supplement ^Vitamin D3 is more effective than vitamin D2 at raising and maintaining adequate levels of circulating vitamin D in the body. ‡Based on Pharmacy Times Survey of pharmacists recommending Letter Vitamin Supplements.