The Sunshine Vitamin in Just One Drop®Mom's Choice Awards - Honoring ExcellenceHelps Support Immune Function and Maintenance of Good HealthDietary SupplementEuro Dropper Technology™Contents Certified NSF®Non GMO Project Verified Vitamin D is made in the skin when exposed to summer sunshine (UVB) and is present in only a few foods. Vitamin D is necessary for healthy bones and normal muscle function. Vitamin D can be measured with a blood test for 25-Hydroxyvitamin D. The National Academy of Medicine recommends this level should be higher than 20 ng/ml. Research findings show a 25 (OH)D blood level above 20 ng/ml is related to better health. A vitamin D3 supplement may be especially helpful for anyone who avoids exposing skin to sunshine.