For decades, testosterone has been cast as the hormone of recklessness—the biological fuel for Wall Street traders, extreme athletes, and teenage boys racing motorcycles. It's a compelling story. It's also, according to the largest analysis ever conducted on the topic, essentially wrong.

A meta-analysis of 52 studies involving 17,340 participants found virtually no association between testosterone levels and risk-taking behavior. The research, published in Neuroscience and Biobehavioral Reviews, examined everything from gambling games to balloon-popping tasks to self-reported questionnaires. The conclusion? Testosterone's influence on risk preferences is, at best, narrow and context-dependent—not the broad hormonal driver we've assumed.

"The idea that testosterone makes you take risks is one of those scientific 'facts' that sounds right because it fits our cultural narratives," the researchers note. But when you actually pool the data from thousands of participants across dozens of studies, that narrative collapses.

Here's what makes this finding particularly striking: it held true regardless of participants' sex. Whether researchers were measuring testosterone in men or women, the hormone showed no meaningful correlation with risky choices. That's important, because it challenges not just pop psychology, but also gendered assumptions about biology and behavior.

The team, led by Irene Sánchez Rodríguez and including researchers Luca Bailo, Folco Panizza, Emiliano Ricciardi, and Francesco Bossi, combed through studies from Google Scholar, PubMed, and Scopus. They looked at research that measured testosterone directly through blood or saliva tests, studies that administered hormones experimentally, and even investigations using morphological proxies like finger-length ratios.

Individual studies showed conflicting results—some positive, some negative, most showing nothing. But when aggregated, the overall effect was negligible. The only exception? Lottery-based economic tasks showed a modest positive link. Everything else—personality questionnaires, behavioral games, real-world risk assessments—came up empty.

So what drive risk-taking? According to the researchers, societal and psychological factors play substantially larger roles. Culture, upbringing, economic circumstances, personality traits—these matter far more than whatever's circulating in your bloodstream.