DHEA & DHEA-S: What They Do

DHEA and its sulfated form DHEA-S are among the most abundant steroid hormones the body makes. They act mainly as raw material that the body can convert into other sex hormones, and they are produced largely by the adrenal glands.

What DHEA and DHEA-S are

DHEA (dehydroepiandrosterone) is a steroid hormone made from cholesterol by way of pregnenolone. The body readily converts much of it into DHEA-sulfate (DHEA-S) by attaching a sulfate group, producing a longer-lasting form that circulates at higher and steadier levels. The two interconvert, so the body holds a large reservoir of DHEA-S that it can draw on as needed. Both are sometimes called "precursor" hormones because the body uses them as building blocks to make androgens such as testosterone and estrogens such as estradiol in various tissues.

Although DHEA and DHEA-S are among the most abundant steroid hormones in the bloodstream, abundance does not mean they are the most active. Much of their importance comes from what other tissues make out of them rather than from strong direct effects of their own. This distinction matters when weighing claims made about DHEA, discussed further below.

Where they are produced

The adrenal glands, which sit on top of the kidneys, are the main source of DHEA and DHEA-S; specifically, a layer of the adrenal cortex called the zona reticularis. The ovaries and testes also contribute smaller amounts. Because DHEA-S comes so predominantly from the adrenal glands, and because it is stable in the blood, it is often used as a marker of adrenal androgen production when a clinician wants to know how much androgen the adrenal glands are making.

What they do across body systems

• Hormone precursors: Their primary, best-established role is to serve as raw material that peripheral tissues convert into androgens and estrogens, locally and as needed.
• Androgen-related features: Through conversion to testosterone, they can contribute to features such as the growth of pubic and underarm hair, especially around the time of adrenarche (the rise in adrenal androgens before puberty).
• Tissue-level supply: Because conversion happens inside target tissues, DHEA lets different organs fine-tune their own sex-hormone exposure without relying entirely on the ovaries or testes — a feature that becomes more relevant after the reproductive years.
• Lifespan pattern: Levels are low in childhood, rise during the years around puberty, peak in early adulthood, and gradually decline over the following decades.

Much about DHEA's direct effects in the body remains an area of ongoing research. Many of its actions are thought to occur only after conversion into other hormones rather than from DHEA itself, and the biological meaning of the age-related decline is not fully settled.

Where the evidence is limited

Because DHEA-S falls with age, it has been marketed widely as an "anti-aging," energy, or rejuvenation supplement, and DHEA is sold over the counter in some countries. It is important to be clear that these popular claims are not well supported. The age-related decline in DHEA is a real observation, but a decline accompanying aging does not establish that taking supplemental DHEA reverses aging, restores youthful function, or prevents disease. Evidence for broad benefits from DHEA supplementation is limited and inconsistent, and because the body converts DHEA into androgens and estrogens, supplements can have hormonal effects that are not trivial. This page does not endorse or recommend DHEA supplements; decisions about them belong with a clinician. See the treatments index for how the site frames therapies generally.

Regulation and feedback

Adrenal production of DHEA is influenced by the hypothalamic–pituitary–adrenal (HPA) axis, the same system that controls cortisol. The pituitary hormone ACTH stimulates the adrenal cortex to produce both cortisol and adrenal androgens including DHEA. Unlike cortisol, however, DHEA-S does not have a tightly characterized negative feedback loop of its own — there is no dedicated hormone that rises specifically to switch DHEA off. Its steadier levels and lack of a sharp daily rhythm make it convenient for testing. Age is one of the strongest influences on DHEA-S, with a gradual, well-recognized decline over the decades, and serious illness or stress can also lower it.

The lifespan curve and why it matters

Few hormones show as clear a relationship with age as DHEA-S. It is barely present in early childhood, climbs during adrenarche and the years around puberty, reaches its lifetime peak in early adulthood, and then drifts downward decade by decade so that levels in later life are a fraction of the young-adult peak. This rise-and-fall shape is the single most important thing to understand about the hormone, because it means a result can only be judged against what is typical for a person's age and sex. A value that would be unremarkable in an older adult could be unexpectedly low in a young adult, and vice versa. The smooth, predictable nature of this decline is also why DHEA-S attracted so much attention as a possible window onto aging — and why it is easy to overinterpret. A marker that falls with age is not automatically a lever that, when pushed back up, restores youth; the decline may simply be one feature of normal aging rather than a cause of it.

What high or low levels can be associated with

Elevated DHEA-S can be associated with increased adrenal androgen production and is sometimes considered in the evaluation of conditions such as polycystic ovary syndrome, or, when markedly high, in looking for adrenal tumors or congenital adrenal conditions. In such settings DHEA-S can help a clinician decide whether excess androgen is coming from the adrenal glands rather than the ovaries. Lower levels are common with aging and can also accompany adrenal underactivity. These associations are qualitative and require professional interpretation; see the conditions index for related topics.

How they relate to other hormones

DHEA sits upstream of the sex hormones, so it connects to both testosterone and estradiol as a shared precursor, and to cortisol through their common control by ACTH and the adrenal cortex. Because of these links, a clinician evaluating androgen excess may look at DHEA-S together with testosterone and other markers to localize the source. For a wider view of how these hormones fit together, see the hormones index and the glossary.

How they are measured in blood

DHEA-S is the form most often measured, because its steady levels do not swing much through the day, making timing less critical than for many hormones such as cortisol. DHEA itself can also be measured in certain situations, though it is less commonly ordered. Results are read against age- and sex-specific reference intervals, which is essential because what is typical for a young adult differs greatly from what is typical later in life. It may be tested alongside other androgens. See the blood tests overview for context.

These categories are illustrative only and not diagnostic cutoffs; reference ranges differ by laboratory, assay, age, and sex.