Epidemiologist Scott Davis warns, "Melatonin supplements are not regulated" the way drugs are. ... "There may be all kinds of impurities and contaminants" ("Bright Lights, Big Cancer: Melatonin-depleted blood spurs tumor growth," SN: 1/7/06, p. 8). Are you really going to tell me that you aren't going to take melatonin—if you're convinced that it might lower your chance of getting cancer by as much as 50 percent—because you are afraid of impurities?
It seems to me irresponsible even to float the idea, as neurologist David M. Holtzman does, of chemically suppressing idle thought and daydreaming in people ("Alzheimer Clue: Busy brain connections may have downside," SN: 1/7/06, p. 3). Who can claim a basis for clinical discrimination of "bad" idle thought and daydreaming from the "idle though