Levels of DHEA can decline with age as part of the natural aging process. DHEA is a hormone that is produced in our bodies by the adrenal glands and the levels of this hormone may begin to decline after the age of 30. Supplementing may help replenish what our bodies lose over time. A study published in the highly respected Journal of the American Medical Association found that supplementation with 50mg of DHEA per day in mature adults helped promote sugar metabolism.