What DHEA-S is and where it comes from

Dehydroepiandrosterone sulfate (DHEA-S) is a steroid hormone produced almost exclusively by the adrenal glands (specifically, the zona reticularis of the adrenal cortex). It is the sulfated form of DHEA, and because of its long half-life (10-20 hours vs. minutes for DHEA), it serves as a stable, reliable marker of adrenal androgen production[1].

DHEA-S is a precursor hormone. It does not have strong biological activity on its own, but it serves as the raw material from which the body manufactures downstream sex hormones — including testosterone and estradiol — in peripheral tissues. In men, adrenal-derived androgens contribute a modest portion of total testosterone. In women, adrenal androgens are the primary source of androgens and contribute significantly to testosterone levels[2].

The age decline: adrenopause

DHEA-S follows one of the most predictable age-related trajectories of any biomarker. Levels rise sharply during adrenarche (ages 6-8), peak in the mid-20s, and then decline at a rate of approximately 2-5% per year for the remainder of life. By age 70-80, circulating DHEA-S is only 10-20% of peak values[3].

This progressive decline is termed "adrenopause." Unlike menopause, which is an abrupt event, adrenopause is gradual and continuous. It affects both men and women, though men maintain slightly higher absolute levels at every age.

DHEA-S is the most robust endocrine biomarker of aging. No other hormone declines as predictably, as universally, or as dramatically across the lifespan.
Age rangeMen (mcg/dL)Women (mcg/dL)% of peak
18-24280-640120-520100%
25-34210-550100-45085-90%
35-44160-45075-37065-75%
45-54100-35055-28045-55%
55-6470-27035-20030-40%
65-7440-20025-15015-25%
75+20-15015-10010-20%
The reference range problem
Most lab reports use a single reference range spanning all adult ages (e.g., 44-332 mcg/dL for men). This means a 65-year-old man with a DHEA-S of 60 mcg/dL is reported as "normal" — even though his level is at the 10th percentile for his age and barely 15% of what it was at 25. Age-adjusted interpretation is essential for meaningful analysis.

Why DHEA-S matters beyond hormones

Epidemiological studies have consistently found associations between low DHEA-S and adverse health outcomes. In the landmark Baltimore Longitudinal Study of Aging, low DHEA-S was associated with increased cardiovascular mortality in men[4].

Additional research has linked low DHEA-S to depression and poor cognitive function in older adults[5], reduced bone mineral density[6], impaired immune function, and frailty. However, it is important to note that these are associations — low DHEA-S may be a marker of overall health decline rather than a cause of it.

The cortisol-to-DHEA-S ratio

The ratio of cortisol to DHEA-S is increasingly recognized as a marker of stress adaptation and adrenal balance. Cortisol and DHEA-S are both produced by the adrenal glands, but they have opposing effects in many systems. Cortisol is catabolic and immunosuppressive; DHEA-S is anabolic and immunoprotective[7].

A high cortisol-to-DHEA-S ratio — meaning relatively high cortisol with relatively low DHEA-S — has been associated with depression, cognitive decline in the elderly, impaired immune function, and poor recovery from illness. This ratio naturally increases with age as DHEA-S declines while cortisol remains relatively stable.

DHEA supplementation: the evidence

DHEA is available as an over-the-counter supplement in the United States (it is prescription-only in much of Europe). The hypothesis behind supplementation is straightforward: if declining DHEA-S is associated with aging and disease, restoring it to youthful levels might confer benefit[8].

The reality is more nuanced. The largest and longest randomized controlled trial — the DHEAge study, 280 subjects aged 60-80, 50 mg DHEA daily for one year — found modest improvements in bone mineral density (in women), skin hydration, and libido, but no significant effects on body composition, cognitive function, cardiovascular risk markers, or quality of life[9].

A dose of 25-50 mg/day typically raises DHEA-S to levels seen in young adults within 1-2 weeks. In women, even 25 mg/day can significantly raise testosterone and dihydrotestosterone (DHT), potentially causing androgenic side effects: acne, oily skin, facial hair growth, and scalp hair thinning.

What DHEA supplementation does to blood work

Important caveat
DHEA supplementation is contraindicated in individuals with hormone-sensitive cancers (breast, prostate, ovarian) because DHEA converts to testosterone and estradiol. Women with PCOS should also avoid DHEA as it can worsen androgen excess. Always monitor blood levels if supplementing.

When to investigate further

While low DHEA-S is usually age-related, certain patterns warrant further workup. Very low DHEA-S for age combined with low cortisol may indicate primary adrenal insufficiency (Addison's disease). Very low DHEA-S with high cortisol may suggest pituitary pathology or Cushing's syndrome[10].

High DHEA-S, conversely, can indicate congenital adrenal hyperplasia (especially the late-onset non-classic form), an adrenal tumor, or PCOS in women. In women, DHEA-S above 700 mcg/dL should be investigated with imaging to rule out an adrenal neoplasm.

Lipa uses age-adjusted ranges
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Bottom line
DHEA-S is the most predictable biomarker of adrenal aging, declining 2-5% per year from your mid-20s. Standard lab ranges mask this decline. Age-adjusted interpretation is essential. Supplementation raises DHEA-S reliably but clinical benefits are modest in healthy individuals. The cortisol-to-DHEA-S ratio is an emerging marker of stress adaptation worth tracking.