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. As we age, our body's ability to produce growth hormone declines rapidly which leads to internal and external aging. While growth hormone injections may replace this deficit, it's expensive and can cause serious side effects.   Nutritropin works in concert with your body to help support production of naturally occurring growth hormone and help support the aging process. While all nutrients are important in cellular regeneration, certain nutrients can stimulate the pituitary to help secrete human growth hormone, which is one of the most important anti-aging substances. Key nutrients in Nutritropin have been shown to influence anabolic activity and cellular metabolism.   Nutritropin does not contain bioengineered growth hormone— a drug that requires a doctor's prescription.