DHEA-S is produced in the adrenal zona reticularis and declines with age.

Dehydroepiandrosterone sulfate (DHEA-S) is a specialized steroid hormone that serves as the most abundant circulating precursor to both androgens and estrogens. Its physiological profile is defined by its specific site of origin, its role as a stable indicator of adrenal activity, and its characteristic age-related trajectory.

Clinical and diagnostic utility

Evidence confirms that DHEA-S is the primary circulating marker of adrenal androgen output. Unlike its precursor, DHEA, which has a half-life of only 15–30 minutes, DHEA-S has a significantly longer half-life of 10–20 hours and a lower metabolic clearance rate. This stability makes it a reliable single-point biomarker for clinical assessment.

• Adrenal insufficiency: DHEA-S levels are highly sensitive markers for diagnosing central adrenal insufficiency, with diagnostic sensitivity ranging from 70% to 89% when adjusted for age.
• Differential diagnosis: Because its synthesis is regulated by ACTH, DHEA-S can distinguish between types of Cushing syndrome (AUC 0.997) and help identify the source of hyperandrogenism in conditions like PCOS.

Mechanistic basis of production and decline

The production and subsequent age-related decline of DHEA-S are governed by the specialized biology of the adrenal cortex.

• Site of synthesis: Nearly 90–100% of circulating DHEA-S originates in the zona reticularis (ZR) of the adrenal cortex. This tissue expresses high levels of the enzyme SULT2A1 (sulfotransferase), which converts DHEA into its sulfated form, creating a large systemic reservoir.
• Adrenopause mechanisms: DHEA-S levels peak in the mid-20s and decline progressively, often reaching only 10–20% of youthful levels by age 70–80. This "adrenopause" is driven by structural atrophy of the ZR and cellular senescence.
• Molecular drivers: The decline is linked to the accumulation of lipofuscin and aggresomes in ZR cells, alongside a reduction in low-density lipoprotein receptors (LDLR), which limits the cholesterol import required for steroidogenesis.

Bottom line

The claim is fully supported by scientific evidence. DHEA-S is produced almost exclusively in the adrenal zona reticularis and serves as a stable, long-lived marker of adrenal androgenic function. Its levels naturally and significantly decline with age due to structural and enzymatic changes in the adrenal cortex.