Herbalists have long believed that raspberry leaf tea taken regularly during pregnancy can prevent complications and make delivery easier. Raspberry has also been used to reduce excessive menstruation and relieve symptoms of diarrhea. However, there is no evidence that it is safe or effective for these uses.

Red raspberry tea is still commonly recommended for pregnant women. However, while there is weak preliminary evidence fromanimal studiesthat raspberry might have an effect on the uterus,1the only real clinical study trial reported to date found no benefit.2 This double-blind placebo-controlled study evaluated the effects of red raspberry in 192 pregnant women. Treatment (placebo or 2.4 g of raspberry leaf daily) began at the 32nd week of pregnancy and was continued until the onset of labor. The results failed to show any statistically meaningful differences between the group. Red raspberry did not significantly shorten labor, reduce pain, or prevent complications. Thus, at present, it appears that red raspberry does not work in the manner ascribed to it by tradition.