About 50 million American men and 30 million women have male- or female-pattern baldness. It can begin early in life, but is much more common after the age of 50, when more than 50 percent of men will experience some kind of hair loss.However, an emerging treatment — platelet-rich plasma (PRP) therapy — appears to help regrow lost hair. And, there are virtually no side effects from PRP, except for a mild feeling of pressure at the injection site.

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