Men’s average testosterone levels have halved in last 50 years, say scientists

Researchers looked at data on male testosterone levels from more than 100,000 men captured between 1972 and 2019. Photograph: AndreyPopov/Getty Images

Men’s average testosterone levels have halved over the past 50 years, according to scientists, who say society is facing a male fertility crisis.

Total testosterone levels in men declined by 54% between 1972 and 2019, according to data presented at the annual meeting of the European Society of Human Reproduction and Embryology in London on Tuesday.