In one study, 109 postmenopausal women, aged at least 40, were randomly split into two groups where one took 80 mg of red clover extract per day for 90 days and the other took a placebo. Then both groups did not receive any pills for 7 days. For the next 90 days, the women were given the opposite of what they took during the first 90 days of the study.
At the end of each 90-day period, while there was no change for placebo, women in the red clover group believed that the quality of their scalp hair and skin had improved. In addition, the red clover group reported increased libido, better mood, less tiredness, and more restful sleep.