Testosterone supplementation did not show consistent benefit for cardiovascular risk , sexual function , mood and behavior , or cognition .
Studies that examined clinical cardiovascular endpoints have not favored testosterone therapy over placebo .
Testosterone is ineffective in treating erectile dysfunction and controlled trials did not show a consistent effect on libido .
Testosterone supplementation consistently increased muscle strength but did not have beneficial effects on physical function .
Most studies on mood-related endpoints found no beneficial effect of testosterone treatment on personality , psychological well-being , or mood .
Testosterone products are recommended by some prescribers in response to a diagnosis or presumption of " low testosterone " ( low-T ) for cardiovascular health , sexual function , muscle weakness or wasting , mood and behavior , and cognition .
Testosterone Administration Decreases Generosity in the Ultimatum Game
How do human beings decide when to be selfish or selfless ? In this study , we gave  testosterone to 25 men to establish its impact on prosocial behaviors  in a double-blind within-subjects design . We also confirmed participants ' testosterone levels before and after treatment through blood draws . Using the Ultimatum Game from behavioral economics , we find that men with artificially raised T , compared to themselves on placebo , were 27 % less generous towards strangers with money they controlled ( 95 % CI placebo : ( 1.70 , 2.72 ) ; 95 % CI T : ( .98 , 2.30 ) ) . This effect scales with a man 's level of total- , free- , and dihydro-testosterone ( DHT ) . Men in the lowest decile of DHT were 560 % more generous than men in the highest decile of DHT . We also found that men with elevated testosterone were more likely to use their own money punish those who were ungenerous toward them . Our results continue to hold after controlling for altruism . We conclude that elevated testosterone causes men to behave antisocially
Testosterone supplementation did not show consistent benefit for cardiovascular risk , sexual function , mood and behavior , or cognition .
Studies that examined clinical cardiovascular endpoints have not favored testosterone therapy over placebo .
Testosterone is ineffective in treating erectile dysfunction and controlled trials did not show a consistent effect on libido .
Testosterone supplementation consistently increased muscle strength but did not have beneficial effects on physical function .
Most studies on mood-related endpoints found no beneficial effect of testosterone treatment on personality , psychological well-being , or mood .
Testosterone products are recommended by some prescribers in response to a diagnosis or presumption of " low testosterone " ( low-T ) for cardiovascular health , sexual function , muscle weakness or wasting , mood and behavior , and cognition .