How Does Horny Goat Weed Work. Icariin inhibits the activity of the PDE5 that's blocking dilation of the arteries in the penis. This allows blood to fill the arteries and the three cylinders in the penis and create an erection. The prescription medication sildenafil (Viagra) works in much the same way. Specs: Quantity: 60 capsules Active ingredients: Natural plants Dose: 250 mg of maca root, 1000 mg of Horny Goat Weed The content on this site is not intended to substitute for the advice of a qualified physician, pharmacist, or other licensed health-care professional. The products may have additional information and instructions on or inside the packaging that you should carefully read and follow. Contact your health-care provider immediately if you suspect that you have a medical problem.
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