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The testosterone boosters, as the name suggests, just boost the testosterone levels. They are not testosterone replacement. Iron Bull Edge They are doing not offer the body with external testosterone like steroids (that are harmful and illegal). They simply stimulate your testes to boost its testosterone production. The boosters sometimes contain ZMA, herbs like Tibullus terrestris, long jack, and ginseng. Since its natural, it is assumed that they are doing not have harmful aspect effects. One issue to be noted is that even natural boosters can cause testosterone accumulation that could adversely have an effect on your prostates. Testosterone enhances unfold of prostate cancer. Read More: http://www.proofferz.com/iron-bull-edge-reviews/