What is DHEA-S?
DHEA-S (Dehydroepiandrosterone Sulfate) is the sulfated, stable storage form of DHEA , one of the most abundant steroid hormones in the human body. It is produced primarily by the zona reticularis of the adrenal cortex, with smaller contributions from the gonads and brain. DHEA and DHEA-S serve as precursor hormones: they can be converted downstream into testosterone and estrogen in peripheral tissues, functioning as a reserve pool of sex hormone precursors that tissues draw on as needed.
DHEA-S is measured in preference to DHEA itself because DHEA-S is far more stable in the bloodstream , it has a half-life of 7–10 hours versus DHEA's 15–30 minutes , making it the clinically reliable form for standard blood testing. DHEA-S follows one of the most consistent and predictable age-related decline patterns of any hormone: it peaks in the mid-20s and declines at approximately 2–3% per year thereafter. By age 70–80, DHEA-S levels are typically just 10–20% of peak youthful values, which is why it is used as a component of biological age estimation in longevity research contexts.
What do the numbers mean?
Women: 150–380 µg/dL
Women: 35–430 µg/dL
DHEA-S interpretation is highly age-dependent , a value of 120 µg/dL is normal for a 70-year-old but may be concerning in a 35-year-old. Always interpret alongside age-specific reference ranges from your laboratory report.
Why this marker matters before peptide research.
In longevity peptide research, DHEA-S serves two distinct roles: as a biological aging marker and as an adrenal function indicator. As a biological aging marker, DHEA-S is one of several hormonal parameters used alongside telomere length, IGF-1, and inflammatory markers to build a composite picture of hormonal age versus chronological age. Researchers studying compounds like Epithalon, NAD+, or MOTS-c , all of which have proposed mechanisms related to cellular aging , use DHEA-S as part of the hormonal aging panel that contextualizes whether a protocol is producing measurable biological age-related changes.
For adrenal and stress axis research, DHEA-S provides critical context alongside AM cortisol. The cortisol-to-DHEA ratio is used in functional medicine and HPA axis research as a marker of adrenal balance and resilience , a high ratio (high cortisol relative to DHEA-S) suggests HPA axis imbalance favoring the stress response over the anabolic hormonal environment. This context is particularly relevant before initiating protocols with compounds like Sermorelin that interact with the GH-HPA axis, or stress-modulating peptides like Selank and DSIP that operate within the same neuroendocrine framework.
DHEA-S also provides indirect context for sex hormone precursor availability. In tissues that express the enzymes needed to convert DHEA to testosterone or estrogen, DHEA-S levels determine how much local sex hormone synthesis is possible. An individual with very low DHEA-S has a reduced precursor pool , relevant context when interpreting testosterone levels and when evaluating whether GH secretagogue protocols (which indirectly support sex hormone production) are working within a replete or depleted hormonal precursor environment.
How to get this test.
Where to order
Standard blood draw at LabCorp, Quest Diagnostics, or through a physician. Often included in comprehensive hormone and adrenal panels. Available via some direct-to-consumer hormone testing services without a prescription.
How to prepare
Morning draw preferred , DHEA-S has a modest diurnal variation, with slightly higher values in the morning. No fasting required. Draw alongside AM cortisol for the most clinically informative HPA axis snapshot.
What to ask for
"DHEA-S" or "DHEA Sulfate" , specify the sulfated form, which is the stable measurable form. Order alongside AM cortisol, IGF-1, and testosterone for a comprehensive hormonal aging baseline relevant to longevity research.