Also documented is the gradual decline in testosterone production that occurs as men age.

Taken together, this strongly suggests that caring for his kids can actually suppress a father's testosterone production.

The increase in size is accompanied by a larger testosterone production.

Decline of testosterone production with age has led to interest in androgen replacement therapy.

All those blows to the head over the years, in other words, have taken their toll on Tintin's testosterone production.

This may or may have to do with liver damage cutting testosterone production.

Exercise is thought to improve and maintain healthier testosterone production with age.

The change is related to changes in testosterone production.

Occasionally chemotherapy may interfere with testosterone production in the testicles.

When men take synthetic steroids, their own testosterone production is inhibited.