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A new class of growth hormone (GH) secretagogues (GHS) has been developed. In rats, the GHS hexarelin exerts cardioprotective effects. In humans, GHS increase growth velocity in children with short stature/GH deficiency. In adults, a combined infusion of GH releasing peptide-2 and thyrotropin releasing hormone increases circulating concentrations of GH as well as that of insulin-like growth factor-I. In healthy volunteers, oral GHS administration reverses diet-induced catabolism, and in healthy obese men, oral GHS treatment increases fat-free mass. However, little is known about the possible direct effects of GHS and there are few long-term studies. Therefore, it is not yet possible to fully evaluate the use of GHS.