Anti-Estrogen or Estrogen Blockers are supplements used to deter the conversion of Testosterone into Estrogen. Testosterone is necessary to build muscle, gain strength and achieve a lean physique. When testosterone levels rise, estrogen levels rise in accordance. Estrogen inhibits your ability to build muscle and burn fat effectively, and when Testosterone levels are high, there is a chance that some of that Testosterone will convert into Estrogen.

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