A hormone released by the posterior lobe of the pituitary gland.

This hormone serves to help conserve body water. it acts on the kidneys and causes them to concentrate urine by reabsorbing more water from the distal or collecting tubules. the hypothalamus detects changes in osmolality of the blood and adjusts the level of ADH appropriately.

Also increases blood pressure by causing arteriole constriction.

This hormone is also known as antidiuretic hormone.

Insufficient ADH production leads to the disorder known as diabetes insipidous