Nearly 3 out of 4 adults and teens may be not be getting enough of the “sunshine” vitamin. Deficiency risk increases with age, skin pigment, and limited sunlight exposure, and is also associated with diabetes, kidney disease, obesity, and inflammatory bowel disease or other gastrointestinal disorders—such as fat malabsorption. Current daily intake recommendations (600 IU) are primarily based on bone health, and it has been suggested that higher levels may be necessary to maintain physical function, muscle strength, and other health functions. Those with diagnosed deficiencies may require daily doses of up to 5,000 IU.†
A good source of vitamin D may be hard to find. Our bodies manufacture vitamin D3 when skin is exposed to the sun’s ultraviolet-B rays—which can be blocked by both windows and sunscreen. And vitamin D is found naturally only in a few foods (e.g., fish, eggs). That’s why products like milk are vitamin D-fortified. Dietary supplements are often recommended, but vary in quality and may not include D3, which may be 3 times more potent than D2. The supplement form (e.g., liquid, tablet) and manufacturing may also influence absorption potential. That's why it’s just as important with this "basic” vitamin to seek higher quality for maximum benefits.
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