While an adequate testosterone level is essential for men to maintain energy, sex drive and reproductive capacity, unnecessary testosterone therapy could increase prostate cancer risk, a study suggests. Testosterone is a hormone produced primarily in the testicles.

Researchers found that testosterone raised the risk of prostate tumours and exacerbated the effects of carcinogenic chemical exposure in rats. “This research demonstrates that testosterone on its own is a weak carcinogen in male rats,” said study author Maarten Bosland from the University of Illinois at Chicago in the US.

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