Douglas Laboratories Vitamin D (5,000 I.U.) | Vitamin D3 Supplement to Support Immune Health, Calcium Levels, and Bones* | 100 Tablets, Vitamin D Source: Also known as the ""sunshine vitamin"", vitamin D has many roles in the body, including proper modulation of cell growth, neuromuscular and immune function health, ensuring normal calcium absorption and maintenance of healthy plasma calcium levels., Healthy Bones & Teeth: Great for healthy bones and teeth. Vitamin D3 is a great supplement for general health support, Vitamins/Minerals/Amino Acids: Our vitamins/minerals and amino acid formulas are developed to provide beneficial support in filling nutrient gaps, Our uncompromising operational practices at our state-of-the-art manufacturing facilities surpass GMP standards and manufacturing regulations. All of our products are GMO-free, For 65 years, Douglas Laboratories has been dedicated to meeting the needs of healthcare professionals. As a globally recognized leader in the development of innovative, science-based nutritional supplements, we strive to help healthcare professionals and their patients push their potential to live healthier, today and in the future,