Xi lan rou gui and Hong hua fen are both vasodilators, meaning they open up the blood vessels to encourage more blood flow. In other words, they can increase blood flow to the penis, causing an erection to occur. This expansion of the vascular spaces of the penis reduce blood outflow, thus sustaining the length of an erection. In addition, Hong hua fen contains omega 3 fatty acids which have been shown to reduce the chances of heart disease.

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