Cortisol – is a stress hormone produced by the adrenal glands. It is termed catabolic as it has the opposite effect to testosterone, insulin and growth hormone in that it breaks down tissue. When produced in excess Cortisol reduces muscle mass and aids in depositing body fat.
Prolactin – also called luteotropic hormone (LTH) or luteotropin, a protein hormone produced by the pituitary gland of mammals that acts with other hormones to initiate secretion of milk by the mammary glands.
Somatostatin – is a hormone that blocks the release of HGH by the pituitary gland. The natural production of somatostatin increases with age, and causes a corresponding decrease in HGH production by the pituitary gland.