To quote from his review: "Vitamin D deficiency and insufficiency have been defined as a 25-hydroxyvitamin D <20 ng/ml and 21-29 ng/ml respectively. For every 100 IU of vitamin D ingested the ...

Researchers have identified that children deficient in vitamin D experience more severe symptoms of obstructive sleep apnea ...

Retinal, a derivative of vitamin A, works in various ways to improve the appearance of your skin. Here’s how to determine how ...