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| Human growth hormone (HGH) is a substance secreted by the pituitary gland that promotes growth during childhood and adolescence. Growth hormone acts on the liver and other tissues to stimulate production of insulin-like growth factor I (IGF-I), which is responsible for the growth-promoting effects of growth hormone and also reflects the amount produced. Blood levels of circulating IGF-I tend to decrease as people age or become obese [1]. Many would believe that boosting HGH blood levels can reduce body fat; build muscle; improve sex life, sleep quality, vision and memory; restore hair growth and color; strengthen the immune system; normalize blood sugar; increase energy; and "turn back your bodys biological clock.
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