Environmental factors like hormone-disrupting substances may be contributing to testosterone decline, scientists say ...

A large meta-analysis, studying five decades, has found a dramatic and sustained decline in testosterone levels among men, raising concerns that the male fertility crisis is deeply misunderstood.

Men's testosterone levels have dropped by 50% in 50 years, with scientists linking the decline to rising obesity and diabetes ...

How male testosterone levels halved in 50 years - ...

Exclusive: Researchers warn of ‘major crisis in male reproductive health’ partly driven by obesity and diabetes ...

Men’s average testosterone levels have halved over the past 50 years, according to scientists, who say society is facing a male fertility crisis. Ian Sample speaks to science correspondent Hannah Devl ...

Over the past 50 years, average levels of the male hormone testosterone have fallen by half. Experts warn that male ...

A new study has found that average testosterone levels in men have fallen by roughly half over the past 50 years.

What are normal testosterone levels by age? An older photographer mentors a younger one. Testosterone is an important hormone. It helps men develop during puberty, and as they age, it plays a critical ...

Testosterone is an important hormone. It helps men develop during puberty, and as they age, it plays a critical role in helping control fat levels, cholesterol, and glucose levels. Testosterone ...