Growth hormone has a wide range of effects in humans and animals. In particular, growth hormone is perhaps best known for its muscle building and fat reducing properties. Optimising growth hormone is therefore beneficial in those that wish to maintain an athletic figure. Certain amino acids may be able to stimulate the release of growth hormone. In particular, L-lysine and L-arginine may have the ability to stimulate the release of growth hormone in humans in the 1 gram to 2 gram range. For example, in one study, researchers administered 1.5 grams of L-arginine and 1.5 grams of L-lysine to healthy young men undergoing resistance training. Administration of the amino acid mix was observed in the rested state, but following exercise the amino acids did not increase growth hormone levels. This latter effect may have been due to the fact that exercise is a significant stimulator of growth hormone and the amino acids may not have been able to stimulate growth hormone further.
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