In an 8-week clinical study, 57 male subjects (18-50 years old) were randomized into 2 groups. Subjects in the treatment group consumed 300 mg of ashwagandha root extract 2x daily, the control group consumed placebos. Following baseline measurements, both groups underwent resistance training for 8 weeks and measurements were repeated at the end of week 8. Compared to the placebo subjects, the treatment group had a significantly greater increase in testosterone level (Placebo: 18.0 ng/dL, 95% CI, -15.8, 51.8 vs. Ashwagandha: 96.2 ng/dL, 95% CI, 54.7, 137.5; p = 0.004).

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