A systematic review found strong positive evidence for the testosterone-boosting effects of Tongkat ali and Tribulus. (2020)
From the publication:
While, 13% of ingredients in this study were given A grades [Eurycoma longifolia (tongkat ali), Tribulus], meaning they had strong positive evidence supporting their use, 81% of ingredients received grades that determined their evidence was indeterminate (C grade) or completely lacking/negative (D grade). Overall, our results showed that 69% of ingredients in testosterone supplements have published evidence of their use in RCTs.
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Although there are several ingredients with A level of evidence, their use should be considered with caution. The evaluation of their safety and effectiveness in conjunction with other components has not been evaluated. Moreover, it has become apparent that many patients often do not consult healthcare providers before trying these products. However, at this time there are still no published RCTs evaluating the efficacy of whole supplement products for testosterone or ED [erectile dysfunction].