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- All the pills claim to have potential sexual benefits like increasing the size of the penis, increasing your sexual stamina, and increasing your sexual libido, but only a few work.However, there is some evidence that these supplements — or even prescription medications like Viagra — can have a negative effect on fertility. Here is what you should know about male enhancement pills and male fertility, including which common ingredients in erectile dysfunction supplements can be damaging and which are sperm-safe.Male enhancement pills are supposed to increase blood flow to the penis to help users get and maintain an erection, consequently boosting sexual desire and performance. Some formulations also claim to support proper testosterone levels, which may be helpful for men with a low libido. Ingredients range from herbs like ashwagandha and ginkgo to vasodilators like sildenafil citrate and tadalafil.The active ingredient in Viagra is sildenafil citrate. Sildenafil, tadalafil (the active ingredient in the drug Cialis), and vardenafil (the active ingredient in the drug Levitra) are known as vasodilators and phosphodiesterase-5 inhibitors. These drugs target and inhibit a specific enzyme in order to open (dilate) the blood vessels and increase blood flow to the penis. This makes it easier for users to obtain and maintain an erection.
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