[A] carefully designed and statistically valid epidemiological study is required to take the hair dye hypothesis further. A recent paper — intended to be reassuring — does not mention any such study.
“Cosmetics and Hair Loss,” Christopher L. Gummer, Clinical and Experimental Dermatology, vol. 27, no. 5, July 2002, pp. 418-21. The author is at Procter and Gamble Europe Ltd, Egham, Surrey, UK.
Dr. Gummer is pictured at right.
