Does low DHEA-S indicate reduced adrenal androgen precursors and lower peripheral testosterone in women?

In women, the adrenal glands and peripheral tissues work in concert to maintain androgen balance. Dehydroepiandrosterone sulfate (DHEA-S) serves as the primary reservoir for this system, and its levels are a direct reflection of adrenal androgenic output.

Clinical and effectiveness evidence

• Androgen Production Pathways: In women, approximately 50% to 66% of total circulating testosterone is derived from the peripheral conversion of adrenal precursors, specifically DHEA and DHEA-S. The remainder is produced directly by the ovaries.
• Adrenal Contribution: Because DHEA-S is produced almost exclusively (90–100%) in the zona reticularis of the adrenal cortex, it serves as the most reliable clinical marker for adrenal androgen reserve.
• Impact of Decline: Clinical studies of age-related decline (adrenopause) and adrenal insufficiency consistently show that when DHEA-S levels drop, there is a corresponding decrease in systemic testosterone. In women with low adrenal output, DHEA supplementation has been shown to increase serum total testosterone levels by up to 100%, highlighting the direct dependence of testosterone levels on these precursors.

Mechanistic explanations

• Precursor Conversion: DHEA-S has a long half-life and is converted back into DHEA by the enzyme steroid sulfatase (STS) when needed by tissues.
• Intracrinology: Once converted to DHEA, peripheral tissues—including adipose, skin, liver, and muscle—utilize a suite of enzymes (3β-HSD and 17β-HSD) to transform these precursors into androstenedione and then into testosterone.
• Enzymatic Dependency: The efficiency of this "intracrine" system ensures that the circulating pool of DHEA-S acts as a constant supply line for active androgens. Consequently, a reduction in the "precursor reservoir" (low DHEA-S) limits the substrate available for these enzymes, resulting in lower local and systemic testosterone concentrations.

Bottom line

The claim is well-supported by established endocrinology; low DHEA-S indicates a diminished adrenal precursor pool, which directly limits the body's ability to synthesize testosterone through peripheral conversion pathways.