The herbal supplement black cohosh, taken for relief of menopausal hot flashes, doesn't work any better than a placebo, a study finds.
Previous research had brought mixed results. Nevertheless, sales of black cohosh have soared as women have turned away from estrogen-replacement therapy, which has been linked with an increased risk of stroke (SN: 4/15/06, p. 228: Available to subscribers at Estrogen Safety: Studies raise cancer, blood clot questions).
Epidemiologist Katherine M. Newton of the Group Health Center for Health Studies in Seattle and her colleagues recruited 351 women who responded to a mailed questionnaire seeking trial volunteers. The women, between the ages of 45 and 55, were each experiencing an average of seven hot flashes, including night sweats, per day.