On a global basis, men's testosterone levels are declining. While lifestyle variables can have an impact on both testosterone levels and sperm health, research suggests that there is something considerably more significant at work.
Over the last 100 years, much has changed in the field of...
age
aged
boys
chemicals
found
function
growth
health
hormone
levels
low
males
men
mens
muscle
percent
phthalates
result
sperm
study
subject
testosterone
women
world
years
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