Dehydroepiandrosterone sulfate (DHEA-S) is an endogenous adrenal hormone primarily produced by the adrenal cortex in response to adrenocorticotrophin (ACTH). It belongs to the steroid hormone chemical class and is a sulfated metabolite of dehydroepiandrosterone (DHEA). DHEA-S circulates in the blood predominantly bound to albumin, with a small fraction unbound. It is a key precursor in the synthesis of androgens and estrogens, playing a significant role in various physiological processes. Researchers have observed that DHEA-S is involved in the regulation of reproductive functions, including ovarian follicular steroidogenesis, and may influence oocyte activation through calcium oscillations. It is also associated with skeletal maturation during puberty and has been studied for its roles in stress response, central nervous system function, and cardiovascular health. The mechanism of action for DHEA-S involves its conversion to active androgens and estrogens, which then interact with specific receptors to mediate biological effects. DHEA-S is slowly cleared from the blood, with a metabolic clearance rate of approximately 13 L/day, and its concentrations are influenced by age, gender, and various physiological states. Clinically, DHEA-S is used in research settings to explore its potential benefits in reproductive health and other areas, though its biological significance remains a topic of debate. Regulatory standing varies by country, with its use often restricted to specific medical indications.