Labdoor ranked Carlson Labs Vitamin D3, Nutrigold Vitamin D3 Gold 1000 IU, Nutrigold Vitamin D3 Gold 2000 IU, Nature Made Vitamin D3 and Nature's Way Vitamin D3 as the top five highest-quality vitamin D3 supplements out of the 20 tested. Nutrigold Vitamin D3 Gold 1000 IU, Nature Made Vitamin D3, Nutrigold Vitamin D3 Gold 2000 IU, NOW Foods Vitamin D3 and Nature's Way Vitamin D3 were the top five supplements with the best value, according to Labdoor.
While there are two types of vitamin D supplements, research indicates that vitamin D3 is more effective than vitamin D2, notes Labdoor. Vitamin D3 is already in the form that the human body synthesizes for use. The U.S. Food and Drug Administration recommends a vitamin D daily value of 400 international units.
Vegans, people with dark skin and the obese are at a higher risk for having a vitamin D deficiency, explains WebMD. Those who have certain medical conditions that prevent the digestive tract from absorbing vitamin D, or those who have kidney issues that prevent them from converting vitamin D to its useful form, also risk developing a deficiency. People can also develop a vitamin D deficiency from avoiding sun exposure.
Vitamin D helps the body use calcium efficiently, notes WebMD. Research also associates low vitamin D levels with increased risks of cancer, asthma in children, cardiovascular disease fatalities and impaired mental function in older adults.