Human growth hormones (hGH) aka somatotropin is a member of the group of hormones called somatotropes. It is a single chained amino acid. Following the release of growth hormone releasing factor from the hypothalamus, it stimulates grrowth in the vast majority of tissues in the body.
1. Khan Academy. Regulation of growth hormone. 2018. [Cited 05/12/18}; available from: https://www.khanacademy.org/test-prep/mcat/biological-sciences-practice/biological-sciences-practice-tut/e/endocrine-system---passage-1