Ghrelin strongly stimulates growth hormone release in humans. - Takaya,K.; Ariyasu,H.; Kanamoto,N.; Iwakura,H.; Yoshimoto,A.; Harada,M.; Mori,K.; Komatsu,Y.; Usui,T.; Shimatsu,A.; Ogawa,Y.; Hosoda,K.; et al. (J Clin Endocrinol Metab, 2000)