DHEA is a steroid hormone produced primarily by the adrenal glands. It is the most abundant hormone in the body, with the highest concentrations found in the brain. The only known function of DHEA is as a precursor hormone, meaning that it is a source material which the body converts into other hormones, such as estrogen and testosterone. It peaks in production by the age of 25 and gradually declines until, by age 70, levels may be more than 80 percent below their earlier highs.
Low DHEA levels have been associated with certain diseases, such as Alzheimer's, cancer, diabetes, multiple sclerosis, lupus, and other immune function disorders. For this reason, researchers have been tempted to speculate that supplementation with a synthetic form of DHEA could reverse these diseases, much like hormone replacement therapy reduces some of the symptoms of menopause by returning the hormone balance to a premenopausal state. However, it has not yet been proven that either the diseases or the aging process itself are a result of lowered levels of DHEA, and it is not yet clear whether using DHEA is helpful or, in the long run, harmful.
I use use dhea every day through out my whole cycle, 25mg a day.