Exogenous testosterone alone or with finasteride does not improve measurements of cognition in healthy older men with low serum testosterone.

@article{Vaughan2007ExogenousTA,
  title={Exogenous testosterone alone or with finasteride does not improve measurements of cognition in healthy older men with low serum testosterone.},
  author={C. Vaughan and F. Goldstein and J. Tenover},
  journal={Journal of andrology},
  year={2007},
  volume={28 6},
  pages={
          875-82
        }
}
Testosterone (T) levels decline as men age, but it is unclear whether this has an effect on cognition. Some studies indicate that lower T levels are associated with memory loss; thus, maintaining a higher T level could have positive effects on aspects of cognitive function. Concerns exist, however, about the effect of T therapy on the prostate in older men. We hypothesized that T replacement in older men with low T levels would improve aspects of cognitive function and that the addition of… Expand
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