Butea superba, also known as Kwao Kreua Daeng or Red Kwao Krua. A PDE- 5 inhibitor will reduce or remove the excess PDE- 5 and allow a strong erection to be achieved. The PDE- 5 inhibitor will help to relax the smooth muscle and allow a greater amount of blood to enter the penis resulting in a much stronger and longer lasting erection.
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