First off, Gain Xtreme is an over-the-counter dietary supplement. The ingredients include l-arginine, l-citrulline, pure nitric oxide super molecule, antioxidants, zinc, citrulline malate, l-taurine and yohimbe. It's intended to boost testosterone levels, reduce recovery time, increase muscle mass and aid with metabolic efficiency. The bottle label states that it helps "build, sustain and repair." You just take two capsules daily.Click here

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