A pilot study published in the journal Dermatologic Therapy suggests that topical calcipotriol, a derivative of active vitamin D, may be an alternative treatment for alopecia areata (AA).
AA is a type of hair loss that results from the immune system mistakenly attacking hair follicles, which is where hair growth begins.
AA typically begins when clumps of hair fall out, leaving bare spots on the scalp or other areas of the body. In rare cases, baldness occurs. It affects approximately 6.8 million people in the U.S.
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