The herbal gingko biloba has failed to preserve mental sharpness in many double-blind studies. But a recent study showed that women who took gingko supplements for six months or longer were shown to have a 60 percent lower risk for ovarian cancer!  Additional lab tests found that a low dosage of active compound gingkoglide caused ovarian cancer cells to stop growing, particularly in the non-mucinous type of ovarian cancer cell.