You might have missed this answer from 9/26: Hair loss could have many underlying causes, many of them genetic and irreversible. (More info: bit.ly/mayo-baldness) Even treatment for reversible hair loss has only had moderate success. A particular type of hair loss (alopecia areata) occurs starting in childhood, and is the result of an otherwise benign autoimmune disorder. A recent review of the literature (bit.ly/bc-alopecia) found moderate success with some treatments for this condition. If it’s irreversible, at least know that I think bald humans look wise & sophisticated.