DHEA (Dehydroepiandrosterone) is an endogenous hormone produced in the adrenal glands, gonads, and brain. It plays a key role in numerous bodily processes including working as an adrogen and neurosteroid. Natural DHEA levels peak in one's mid 20's, and decrease rapidly as one enters middle age. Signs that your DHEA levels are dropping include fatigue, depression, muscle loss, and having less energy. Taking DHEA as a supplement can help counter these symptoms and helps one maintain their mood and vitality as they age.