DHEA: The Adrenal Hormone That Declines With Age

DHEA is the most abundant steroid hormone in the body and a precursor to both testosterone and estrogen — but levels drop 80-90% by old age.

DHEA (dehydroepiandrosterone) is a steroid hormone made by your adrenal glands and, in smaller amounts, by the brain and gonads. It serves as the raw material your body converts into sex hormones — testosterone in men, estrogen in women — and it's the most abundant steroid in human blood. The catch: DHEA production peaks in your mid-20s and declines roughly 2–5% every year after that. By your 70s or 80s, levels are 80–90% below their peak [1]. This steep age-related drop, sometimes called "adrenopause," has made DHEA one of the most studied hormones in longevity research.

What DHEA Does in the Body

DHEA acts as a hormone precursor — it doesn't do much on its own but is converted locally, within individual tissues, into biologically active androgens and estrogens. This process of local conversion, called intracrinology, means different tissues can regulate their own hormone levels independently of blood concentrations.

The adrenal glands produce DHEA in two forms: DHEA itself (a short-lived molecule) and DHEA-S (dehydroepiandrosterone sulfate), the sulfated storage form that circulates in the blood at much higher concentrations and serves as a reservoir that cells draw from as needed. When researchers measure DHEA levels, they typically measure DHEA-S.

Beyond hormone conversion, DHEA has direct effects at the cellular level. It acts on GABA-A receptors (with effects similar to some anti-anxiety compounds), NMDA receptors involved in memory and learning, and sigma-1 receptors that influence neuroprotection. These neurosteroid actions help explain why DHEA-S levels in the blood correlate with mood and cognitive function in observational studies — even if supplementation trials haven't cleanly reproduced those benefits [5].

Bone Density and Body Composition

The most consistently studied benefit of DHEA supplementation is its effect on bone mineral density in older adults, particularly women. Because DHEA is converted to estrogen in bone tissue, and estrogen is essential for bone maintenance, declining DHEA may contribute to postmenopausal bone loss.

The DAWN trial — a year-long randomized, placebo-controlled study of 225 healthy adults aged 55–85 — found that 50 mg daily DHEA produced a statistically significant improvement in lumbar spine bone mineral density in women (p = 0.03), with no significant effect at other sites and no meaningful benefit in men [3]. A pooled analysis of four clinical trials confirmed this sex-specific pattern: DHEA supplementation produced modest but real gains in bone density for women, while men showed little response [2].

On body composition, the evidence is mixed. Some trials show modest reductions in abdominal fat and slight improvements in lean mass, but the effects are not dramatic, and results vary considerably across studies.

Dosage and Practical Considerations

Standard supplementation doses studied in research range from 25 mg to 100 mg per day, taken orally. Most long-term trials have used 50 mg. DHEA is sold over the counter in the United States as a dietary supplement, though it is a regulated prescription drug in most other countries.

Because DHEA converts to both androgens and estrogens, supplementation can raise levels of these hormones — which is the intended mechanism, but also a reason for caution:

In women, DHEA supplementation raises testosterone and estrogen. The androgenic effects (acne, oily skin, hair changes) are dose-dependent.
In men, most DHEA converts to estrogen rather than testosterone, which may be undesirable.
Anyone with hormone-sensitive conditions (estrogen receptor-positive breast cancer, prostate cancer, polycystic ovary syndrome) should avoid DHEA without physician guidance.
Baseline DHEA-S testing is useful before starting supplementation — people with already-normal levels have little to gain.

The FDA has approved a vaginal preparation of DHEA (prasterone/Intrarosa) for treating genitourinary syndrome of menopause, where it is the best-evidenced application.

Cross-reference: See our adrenal health page for more on adrenal function and the HPA axis. The DIM page covers how estrogen metabolites are processed downstream.

Evidence Review

Bone Mineral Density

Mohamad et al. (2024) published a review in Biomedicines analyzing 36 studies on DHEA and bone health [1]. They confirmed that DHEA's bone-protective effects operate via two main pathways: direct action on osteoblasts through androgen and estrogen receptor signaling, and indirect action through peripheral conversion to sex hormones. The review found consistent evidence of DHEA's protective effects in preclinical models, with more mixed results in human trials, particularly in men.

von Mühlen et al. (2008) — the DAWN trial — randomized 225 adults aged 55–85 to 50 mg DHEA or placebo for 12 months [3]. In women, lumbar spine BMD improved significantly (p = 0.03); no significant effect was seen at the hip, femoral neck, or total body in either sex. The trial used dual-energy X-ray absorptiometry (DXA) for measurement and documented that DHEA raised serum estradiol levels in women, suggesting the bone effect was estrogen-mediated.

Jankowski et al. (2019) pooled data from four randomized controlled trials (n = 424) to examine sex-specific DHEA effects on BMD and body composition [2]. In women, DHEA supplementation improved femoral neck and total hip BMD. The effect on fat mass was inconsistent. Men showed no significant BMD response across any site. The authors concluded that DHEA therapy has a modest but real bone-protective effect in older women.

A 2019 systematic review and meta-analysis (PMID 31237150) incorporating multiple RCTs reached a similar conclusion: DHEA produced small but statistically significant BMD improvements in older women, primarily at the hip and spine, with no consistent effect in men.

Hormone Levels and Body Composition

Morales et al. (1998) conducted a double-blind crossover trial in 19 adults aged 50–65 who received 100 mg DHEA daily for six months [4]. DHEA-S levels rose into the range typical of young adults. Women showed significant increases in both testosterone and estradiol; men showed smaller androgen increases and more pronounced estrogen elevation. Both men and women reported improved well-being and physical performance, but objective measures of muscle strength showed modest and inconsistent changes.

The body composition data across trials suggests DHEA may modestly reduce visceral fat in older adults, but effect sizes are small and not replicated uniformly. One mechanism proposed is DHEA's inhibition of cortisol signaling in adipose tissue — DHEA and cortisol are metabolically antagonistic, and chronic high cortisol is a driver of central fat accumulation.

Cognitive Function

Observational studies show that lower DHEA-S levels correlate with worse cognitive performance in older adults — particularly working memory, attention, and verbal fluency in women. These associations have generated significant interest in DHEA as a cognitive-protective agent.

However, intervention data has been consistently disappointing. A Cochrane systematic review of randomized controlled trials found no evidence that DHEA supplementation improves memory or other cognitive outcomes in non-demented middle-aged or older adults [5]. The reviewers noted that trials to date have been short (typically 3–12 months) and underpowered for cognitive endpoints. Whether longer treatment or higher-risk populations might benefit remains an open question.

Mood and Well-Being

Multiple trials have documented self-reported improvements in mood and sense of well-being with DHEA supplementation. A randomized, controlled trial specifically in patients with adrenal insufficiency (who have very low endogenous DHEA due to adrenal gland damage) found significant improvements in mood, energy, and sexual function with DHEA replacement — this population is likely to see the clearest benefit because they start from a state of pronounced deficiency.

In healthy older adults with age-related DHEA decline, the evidence for mood benefit is less clear, with some trials showing subjective improvements and others showing no significant difference from placebo.

Safety Profile

Short-term DHEA supplementation at 25–100 mg/day appears safe in most healthy adults. The most common adverse effects are androgenic: acne, oily skin, and facial hair in women. Longer-term safety data are limited. The theoretical concern that DHEA's conversion to estrogen could promote hormone-sensitive cancers has not been confirmed in trials, but the evidence base is not large enough to rule it out definitively in high-risk individuals.

Summary of Evidence Strength

Outcome	Evidence Strength	Notes
Bone density (women)	Moderate	Consistent across multiple RCTs; effect modest
Bone density (men)	Weak	No significant benefit in trials
Body composition	Weak-moderate	Small effects; inconsistent
Cognitive function	Insufficient	Cochrane review negative; trials underpowered
Mood/well-being	Moderate (in deficiency)	Clearest benefit in adrenal insufficiency
Vaginal atrophy	Strong	FDA-approved topical formulation

DHEA is a legitimate area of research rather than a hype-driven supplement, but the honest picture is that its benefits in healthy older adults are modest and selective — primarily bone protection in women. People considering supplementation should first confirm their DHEA-S levels are genuinely low, seek physician guidance, and maintain realistic expectations.

References

Dehydroepiandrosterone and Bone Health: Mechanisms and InsightsMohamad NV, Razali NC, Shamsuddin NM. Biomedicines, 2024. PubMed 39767687 →
Sex-specific effects of dehydroepiandrosterone (DHEA) on bone mineral density and body composition: A pooled analysis of four clinical trialsJankowski CM, Wolfe P, Schmiege SJ, Nair KS, Khosla S, Jensen M, von Muhlen D, Laughlin GA, Kritz-Silverstein D, Bergstrom J, Bettencourt R, Weiss EP, Villareal DT, Kohrt WM. Clinical Endocrinology (Oxford), 2019. PubMed 30421439 →
Effect of dehydroepiandrosterone supplementation on bone mineral density, bone markers, and body composition in older adults: the DAWN trialvon Muhlen D, Laughlin GA, Kritz-Silverstein D, Bergstrom J, Bettencourt R. Osteoporosis International, 2008. PubMed 18084691 →
The effect of six months treatment with a 100 mg daily dose of dehydroepiandrosterone (DHEA) on circulating sex steroids, body composition and muscle strength in age-advanced men and womenMorales AJ, Haubrich RH, Hwang JY, Asakura H, Yen SS. Clinical Endocrinology (Oxford), 1998. PubMed 9876338 →
No current evidence for an improvement in memory or other aspects of cognitive function of non-demented older people following DHEA supplementsGrimley Evans J, Malouf R, Huppert F, van Niekerk JK. Cochrane Database of Systematic Reviews, 2006. Source →