The fruits of Serenoa repens inhibit the enzyme 5-alpha-reductase, thereby reducing the stimulation and proliferation of prostate cells. Thus the volume of the prostate is reduced without any adverse effects.
The presence of theophylline and caffeine in leaf Maté, stimulates the heart muscle and central nervous system, relaxing the smooth muscles, especially those of the bronchi and acts favorably on the peripheral blood circulation, which could explain the traditional application of against headaches.