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If you measure your DHT (Dihydrotestosterone) level, you are looking at the most powerful androgen your body makes. Androgens are hormones that shape male sexual traits, and DHT is the strongest one circulating in your blood. Your body produces DHT by converting testosterone through an enzyme called 5-alpha-reductase. Only about 5 to 10 percent of your testosterone gets converted this way, but the resulting hormone punches well above its weight: DHT binds to androgen receptors more tightly and lingers longer than testosterone itself.
Knowing your DHT level can help you understand what is driving certain changes in your body. A high level may help explain why your hair is thinning at the temples, why your prostate is enlarging, or why your skin is oilier than expected. A low level, on the other hand, can signal a deficiency in the enzyme that converts testosterone to DHT, which has consequences for sexual development and reproductive health.
DHT plays different roles depending on where you are in life. Before birth, it is essential for forming the external genitalia and guiding testicular descent. During puberty and adulthood, it shifts its influence toward tissues like the prostate, the skin, and scalp hair follicles.
In adult men, DHT is the primary driver of prostate growth. It also controls sebum production in the skin, which is why androgen levels are closely tied to acne and oily skin. Perhaps most visibly, DHT is the hormone behind male-pattern hair loss. In people who are genetically susceptible, DHT binds to receptors in scalp follicles and gradually shrinks them, turning thick terminal hairs into fine, barely visible ones over time.
The enzyme responsible for making DHT, 5-alpha-reductase, is most active in the prostate, skin, and liver. Two versions of this enzyme exist (called type 1 and type 2), and your body can also produce small amounts of DHT through alternative biochemical routes that bypass testosterone entirely.
A serum DHT test directly measures the concentration of dihydrotestosterone in your blood. It does not measure how much androgen activity is happening in specific tissues like the prostate or scalp, but it reflects your overall DHT production and gives you a meaningful window into androgen metabolism.
The most established clinical reasons to check DHT include investigating a suspected 5-alpha-reductase deficiency, evaluating delayed puberty or undescended testes, and confirming active testicular tissue. If you are a man experiencing hair thinning, prostate symptoms, or unexplained changes in sexual function, knowing your DHT level adds a layer of information that testosterone alone does not provide.
Because DHT does not convert into estrogen (unlike testosterone, which can be transformed into estradiol by another enzyme), it occupies a unique hormonal niche. This distinction matters if you are tracking your full androgen and estrogen balance.
Two common conditions are closely tied to excess DHT activity, and both are considered risk factors for metabolic syndrome.
On the other end of the spectrum, 5-alpha-reductase type 2 deficiency results in very low DHT levels. Children with this condition may be born with underdeveloped external genitalia, and treatment during infancy with topical DHT can increase penile length by 40 to 63 percent in prepubertal and peripubertal cases.
Because DHT is produced from testosterone, anything that changes your testosterone level or 5-alpha-reductase activity will shift your DHT. The most direct pharmacological tools are 5-alpha-reductase inhibitors.
What this means for you: if your DHT is elevated and you are experiencing hair loss or prostate symptoms, 5-alpha-reductase inhibitors are the most evidence-backed option to discuss with a clinician. If your DHT is low relative to your testosterone, it may point to reduced enzyme activity worth investigating further.
Transdermal DHT has been studied as an alternative to testosterone replacement in older men with partial androgen deficiency. Early trials showed improvements in sexual function and body composition, but also a decrease in spinal bone mineral density, which has limited its adoption. This remains investigational and is not standard practice.