What DHEA is
Dehydroepiandrosterone (DHEA) is a steroid hormone produced primarily by the adrenal cortex (zona reticularis). It's the most abundant steroid hormone in human circulation. The sulfated form (DHEA-S) is the form measured in blood tests because it has longer half-life than free DHEA.
DHEA itself has weak androgenic activity but its primary role is as a precursor, a building block that gets converted in tissues to more potent hormones.
The precursor cascade
The steroid hormone cascade:
- Cholesterol → Pregnenolone (the master precursor)
- Pregnenolone → DHEA → Androstenedione → Testosterone → Estradiol/DHT
- Pregnenolone → Progesterone → Aldosterone (mineralocorticoid pathway)
- Pregnenolone → Progesterone → Cortisol (glucocorticoid pathway)
DHEA can be converted to testosterone in tissues that have the necessary enzymes, particularly in women (where DHEA contributes substantially to T production) and to some extent in men (more dependent on testicular production).
Age-related decline
DHEA-S levels peak in early adulthood (mid-20s) and decline approximately 10% per decade:
- Age 25 (peak): 350-500 µg/dL
- Age 50: 150-250 µg/dL
- Age 70: 50-150 µg/dL
The decline is one of the most consistent age-related hormonal changes, sometimes called "adrenopause."
Stress and DHEA
In chronic stress, the adrenal gland prioritizes cortisol production. DHEA precursors (pregnenolone) get diverted toward cortisol synthesis at the expense of DHEA. This is sometimes called "pregnenolone steal", the same precursor pool, redirected.
The result: chronic stress tends to lower DHEA. The cortisol/DHEA ratio is sometimes used as a marker of HPA axis dysregulation.
Low DHEA symptoms
Symptoms of low DHEA:
- Fatigue not explained by sleep
- Reduced libido (particularly in women)
- Reduced muscle mass
- Low mood
- Reduced sense of well-being
- Reduced bone density
- Reduced exercise capacity
These overlap with many other conditions and are not specific to DHEA.
Supplementation approach
For confirmed low DHEA-S:
- Men: typically 25-50 mg daily DHEA
- Women: typically 5-25 mg daily (lower because women convert more to testosterone)
- Take in morning to mimic natural rhythm
- Re-test DHEA-S, T, E2 at 2-3 months
- Adjust dose to target mid-range young-adult levels
Monitoring DHEA-S
Standard test is DHEA-S (sulfated form). Reference ranges age-adjust but can be misleading, "normal for age" may be substantially below optimal. Many practitioners target young-adult range rather than age-matched range.
Companion testing: total + free testosterone, estradiol, cortisol (AM serum or salivary curve), SHBG.
The clinical pearl: DHEA is often the missing piece in adults with multiple low-normal sex hormone levels and chronic stress symptoms. Restoring DHEA can lift the entire cascade modestly. Particularly relevant in women, postmenopausal patients, and patients with HPA axis dysregulation.
Bottom line
DHEA is a steroid hormone precursor with substantial age-related decline. Low DHEA contributes to reduced sex hormone production and various symptoms. Supplementation in confirmed low patients can be valuable. Particularly relevant in chronic stress states, aging, and women.