On average, Black men do have higher total testosterone levels than white, Hispanic, and Asian men, but the difference is more modest than many people assume. The largest study using CDC-recommended measurement methods, drawing from nearly 5,000 men in the National Health and Nutrition Examination Survey (NHANES), found that non-Hispanic Black men averaged 457 ng/dL compared to 421 ng/dL for non-Hispanic white men. That’s about an 8.5% difference. The gap widens or narrows depending on age, body weight, and other health factors.
What the Numbers Actually Show
The NHANES analysis of 4,772 men found average total testosterone levels of 457 ng/dL for Black men, 421 ng/dL for white men, 416 ng/dL for Hispanic men, and 418 ng/dL for Asian men. After adjusting for smoking, diabetes, high cholesterol, BMI, and high blood pressure, Black men still had testosterone levels roughly 31 ng/dL higher than white men. That difference was statistically significant but represents a relatively narrow gap in practical terms.
The gap is most dramatic in a specific subgroup: Black men under 50 with a normal BMI (18.5 to 24.9). In that group, average testosterone was 637 ng/dL compared to 469 ng/dL in white men of similar age and weight. That’s a 36% difference, far larger than the overall population average. Body weight matters enormously here. Each one-point increase in BMI lowers testosterone by about 10 ng/dL, and because obesity rates differ across racial groups, much of the population-level difference shrinks when you compare men of similar body composition.
Total Testosterone vs. What the Body Can Use
Total testosterone isn’t the whole picture. Much of the testosterone in your blood is bound to a carrier protein called SHBG, which essentially locks it up so your cells can’t use it. Only the unbound portion, called free testosterone, is biologically active. Research on prepubertal boys found that SHBG levels were about 25% higher in African American boys than in white boys. Over a third of the African American boys in that study had SHBG concentrations in the highest fifth of the range, compared to just 4% of white boys.
Higher SHBG means more testosterone gets bound up in circulation and less is freely available to tissues. So while total testosterone may be higher, the amount that actually reaches cells and drives biological effects could be closer between groups than the total number suggests. Studies in adolescents aged 16 to 19 found no statistically significant difference in either total or free testosterone between Black and white teens after adjusting for pubertal stage and other factors. The picture changes with age, but SHBG is a key reason why total testosterone alone can be misleading.
Androgen Sensitivity Adds Another Layer
Testosterone works by binding to androgen receptors inside cells. These receptors have a section with a repeating genetic sequence (called a CAG repeat), and the length of that sequence affects how strongly the receptor responds to testosterone. Shorter repeats mean a more sensitive receptor. Studies of men with prostate cancer found that Black men averaged a CAG repeat length of 19.8 compared to 21.9 in white men. Shorter repeats could mean that even at similar testosterone levels, cells in Black men may respond more strongly to the hormone.
Black men also show higher levels of dihydrotestosterone (DHT), a more potent form of testosterone that the body converts from regular testosterone. After adjusting for confounding factors, Black men had higher DHT levels and a higher ratio of DHT to testosterone than white or Hispanic men. This conversion matters because DHT drives many of testosterone’s effects on the prostate, skin, and hair follicles more powerfully than testosterone itself.
BMI, Education, and Environment Shape the Gap
Biological differences exist, but they don’t operate in a vacuum. Body fat is one of the strongest predictors of testosterone in any man regardless of race, and it consistently dwarfs the effect of race alone in statistical models. Leaner men have higher testosterone, and the subgroup where racial differences are largest (normal-weight men under 50) is also the subgroup where body composition is most tightly controlled.
Socioeconomic and lifestyle factors also play a role. An analysis of NHANES data found that among men aged 20 to 29 with no education beyond high school, Black men had testosterone levels nearly 100 ng/dL higher than white men of the same age and education level. That interaction between race and education was statistically significant, while education alone was not. The researchers linked this pattern to social and behavioral factors, including stress exposure and lifestyle differences associated with socioeconomic status. Marital status also matters: testosterone tends to drop after marriage, and marriage rates differ across racial and age groups, further complicating simple comparisons.
What This Means for Health
The clinical relevance of these differences centers largely on prostate cancer. Black men in the United States are diagnosed with prostate cancer at significantly higher rates and are more likely to develop aggressive forms of the disease. Higher testosterone and DHT levels in younger men, combined with shorter androgen receptor CAG repeats and potentially greater receptor sensitivity, have been proposed as contributing factors. One study found that a rapid decline in testosterone, bioavailable testosterone, and free testosterone in men 65 and older was significantly associated with prostate cancer risk, and that lower levels at any age were linked to more advanced disease at diagnosis.
The relationship between testosterone and prostate cancer is not straightforward, though. Some large studies have found no clear association between circulating testosterone and prostate cancer risk, while others have found links in specific age groups or at specific hormone levels. The current evidence suggests testosterone is one piece of a complex puzzle that includes genetics, receptor biology, diet, healthcare access, and screening patterns.
For bone health, the relationship is similarly nuanced. Research in adults aged 40 to 60 found that testosterone above 500 ng/dL was actually associated with lower bone mineral density in Black, white, and Mexican American men. Below that threshold, testosterone had no significant effect on bone density. This counterintuitive finding suggests that more testosterone does not simply translate to stronger bones.
Why Race-Specific Reference Ranges Matter
The standard reference range for testosterone in adult men, typically around 300 to 1,000 ng/dL, was developed largely from studies of white men. The NHANES researchers who documented the racial gap recommended using ethnicity-specific testosterone norms, particularly for Black men. A Black man with a level of 350 ng/dL might be further below his population’s expected range than a white man with the same number, potentially leading to underdiagnosis of low testosterone. Conversely, a reading of 500 ng/dL in a Black man might be perfectly average for his demographic, not a sign of excess.
This distinction has real consequences for diagnosis and treatment. If clinicians use a one-size-fits-all reference range, they risk misclassifying hormone status in a meaningful number of patients. The push for race-specific norms is not about reinforcing stereotypes but about improving the precision of medical care.