Move over, estrogen and testosterone. Melatonin is one hot hormone. At least five books on melatonin have been published so far this year, and one, The Melatonin Miracle, has hit the New York Times bestsellers list. Consumers seem to be racing from bookstores to drugstores. Source Naturals of Santa Cruz, Calif., one of more than a dozen distributors of melatonin supplements, has shipped well over a million bottles so far in 1995-20 times more than in 1993.
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