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There is considerable interest in understanding the biological basis of individual differences in risk taking and a number of hypotheses have now been put forward regarding the role of basal hormone levels in accounting for such differences. Yet, to date, the empirical literature on this issue is mixed and has not been appropriately summarized, making it difficult to assess whether specific hormones have any predictive power or do so differentially for different psychological constructs thought to underlie risk taking. We contribute to clarifying these issues by reporting meta-analyses of the link between basal hormone levels of testosterone, estradiol, and cortisol, and various measures of risk taking and related constructs.