What it measures.
DHEA-S (dehydroepiandrosterone sulfate) is the most abundant steroid hormone in circulation, produced exclusively by the adrenal glands. It serves as a precursor to both testosterone and estrogen, declining ~10-20% per decade after age 30, making it a valuable marker of adrenal function and biological aging.
The blood concentration of DHEA in its sulfated (storage) form. Unlike DHEA, DHEA-S has no circadian variation, making it a more stable and reliable clinical marker.
Why it matters.
DHEA-S levels reflect adrenal function and correlate with aging and vitality. Low levels are associated with fatigue, depression, reduced immunity, and accelerated aging. The cortisol-to-DHEA-S ratio indicates stress burden and catabolic/anabolic balance.
Physiology.
The adrenal cortex produces DHEA-S under ACTH stimulation. Peak levels occur around age 20-25, then decline steadily. DHEA-S converts to DHEA, which serves as a precursor for testosterone and estrogen synthesis in peripheral tissues. Unlike cortisol, DHEA-S provides anabolic, anti-inflammatory effects.
Testing & preparation.
How to prepare
- No fasting required
- Can be drawn anytime (no circadian variation)
- Note any DHEA supplementation
When to test
When assessing adrenal function, fatigue evaluation, or as part of hormone and aging assessment.
How often
Annually; more frequently if supplementing or treating deficiency.
Interpretation.
High dhea-s
Common causes:
- DHEA supplementation
- Adrenal hyperplasia
- Adrenal tumors (rare)
- Polycystic ovary syndrome (women)
Implications:
- If supplementing: may indicate excess dosing
- In women: may cause acne, hair growth, menstrual changes
- Investigate if elevated without supplementation
Low dhea-s
Common causes:
- Normal aging (declines 10-20% per decade)
- Adrenal insufficiency
- Chronic stress and HPA axis dysfunction
- Chronic illness
- Long-term corticosteroid use
Implications:
- Reduced precursor for sex hormones
- May contribute to fatigue and low vitality
- Marker of accelerated biological aging
- High cortisol:DHEA-S ratio indicates stress burden
Optimization.
Diet
- Adequate protein and healthy fats
- Blood sugar stability (avoid glucose spikes)
- Anti-inflammatory diet
Lifestyle
- Stress management (preserves DHEA relative to cortisol)
- Quality sleep for adrenal recovery
- Regular moderate exercise
- Avoid chronic overtraining
Supplements
- DHEA supplementation (typically 25-50mg daily) under medical supervision
- 7-keto DHEA (non-hormonal metabolite alternative)
- Adaptogenic herbs may support adrenal function
FAQs.
What is the cortisol-to-DHEA-S ratio and why does it matter?
This ratio reflects the balance between catabolic (cortisol) and anabolic (DHEA-S) adrenal hormones. A high ratio indicates chronic stress burden where the body prioritizes cortisol production over DHEA-S. Elevated ratios are associated with immune dysfunction, cognitive decline, depression, and accelerated aging. Improving this ratio through stress management and lifestyle changes supports healthier aging.
Should I supplement DHEA?
DHEA supplementation is controversial. Some evidence supports benefits for mood, bone density, and body composition in older adults with documented low levels. However, DHEA converts to sex hormones, so supplementation can raise testosterone and estrogen, potentially causing side effects. Always test levels first, work with a knowledgeable provider, and monitor downstream hormones. Typical doses are 25-50mg daily.