What Is DHEA? Dosage, Half-Life & How to Track It

What DHEA is and how it works

DHEA is produced mostly by the adrenal cortex (with small amounts from the ovaries, testes, and brain), and on its own it’s only weakly hormonally active. Its real role is as a precursor: peripheral tissues carry the enzymes to convert DHEA into testosterone, and from there — in tissues with aromatase — into estradiol. Which direction it leans, and how much, depends on which tissue and which enzymes are locally available, not on DHEA itself.

DHEA production follows a distinctive life-cycle pattern: it peaks in the mid-20s and then declines steadily with age, a drop-off sometimes called adrenopause. That decline is the basis for most interest in supplementing it — as a general vitality/anti-aging supplement, as support for women with adrenal-related low libido or mood, and off-label in some fertility clinics to support ovarian response ahead of IVF.

The regulatory status is unusual for a hormone: under U.S. dietary-supplement law, DHEA is sold over the counter, unlike nearly every other compound in this library, which require a prescription. That accessibility doesn’t mean it’s hormonally inert — it still raises downstream testosterone and estrogen, with the same categories of side effects a prescription androgen would carry.

Dosing: fixed OTC strengths

DHEA is sold in fixed capsule or tablet strengths — most commonly 25 mg, 50 mg, and 100 mg — so there’s no reconstitution or concentration math the way there is with an injectable. The dosing lever is which strength to buy and how often to take it, once daily being standard.

General supplementation protocols commonly run 25–50 mg/day. Women’s protocols are typically dosed much lower — often 5–25 mg/day — because women are more sensitive to DHEA’s downstream androgenic effects (acne, unwanted hair growth) at doses that are unremarkable for men.

These are commonly reported ranges, not a protocol — DHEA-S labs, not a fixed calendar, are what should drive any adjustment.

Half-life & why DHEA-S is the number that matters

DHEA itself is cleared from the blood quickly — on the order of 15 to 30 minutes — because it’s rapidly converted by sulfotransferase enzymes into DHEA-S, its sulfated form. DHEA-S is the form that actually circulates in bulk: it has a far larger reservoir in the blood and a much longer half-life, commonly cited around 7 to 10 hours, which is what makes once-daily dosing practical for keeping levels reasonably steady.

That split is exactly why bloodwork measures DHEA-S, not DHEA, as the marker of both natural production and supplementation status — DHEA’s own level swings too fast within a day to be a reliable single measurement, while DHEA-S reflects the accumulated pool.

What to track & side effects

The lab to track is DHEA-S, ideally drawn a consistent number of hours after the daily dose so results are comparable over time. Since DHEA converts into both testosterone and estrogen, some protocols also track total testosterone and, in men, estradiol, to catch a dose running higher than intended in either direction.

Side effects follow directly from the downstream hormones: in women, acne, oily skin, and hirsutism (unwanted hair growth) are the most commonly reported issues at higher doses; in men, high doses can raise estrogen enough to cause breast tenderness or gynecomastia via aromatization. Because DHEA feeds both androgen and estrogen pathways, it’s generally avoided by anyone with a hormone-sensitive condition, such as a history of breast or prostate cancer, without a prescriber’s sign-off.

Frequently asked questions