Growth hormones are poly-peptide hormones, which are protein-based. They stimulate cell reproduction and regeneration which naturally stimulates growth. They are used clinically in order to treat adult growth hormone deficiency or childhood growth disorders.
 
 
Recommended Resources
Growth Hormone Deficiency in Children
Article provides a medical overview of Growth Hormone Deficiency (GHD) by a pediatric endocrinologist, an explanation about GHD, and a glossary of terms.
http://www.magicfoundation.org/www/docs/108/growth_hormone_deficiency_in_children.html
Outlines the growth hormone somatotropin, what it does physiologically, and the growth and metabolic effects on the body. It also delves into control of growth hormone secretions. with a link to an article on growth hormones and aging.
http://www.vivo.colostate.edu/hbooks/pathphys/endocrine/hypopit/gh.html
Human Growth Hormone (HGH): Breakthrough or Hype?
Research paper looks at the history of uses of HGH, its use in athletes, clinical studies done on athletes, and the effects of HGH on the elderly. Also included are data about the side effects of human growth hormone supplementation.
http://www.eternalhgh.com/