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Fortunatly, there were sufficient trials to where researchers could do a meta-analysis on all the studies in toto. The latest large study in 2001 and a previous one both found came to the same conclusion: there is a "weak, positive relationship" between testosterone levels and aggression.  In other words, on average testosterone makes males slightly more aggressive.
So, bottom line, is that we cannot really blame testosterone for bad behavior. Interestingly enough, researchers have found that estrogen/artomatase likely plays just as much of a role along with certain stress hormones.
What about men with very low (hypogonadal) testosterone? Are they particularly sensitive to the extra testosterone in a negative way? The studies show no significant increase in aggressive behavior in this group either.  In fact, this same study showed a decrease in many negative emotions, i.e. "significant reductions in negative mood (tension, anger, and fatigue) followed by an increase in vigor were found in response to T treatment in the hypogonadal group".  Still other studies have shown that Hormone Replacement Therapy improves mood and outlooks as well.
CAUTION: If you have a medical condition or are on any medications, please discuss any changes with your doctor first. Certain supplements, foods and even juices can alter absorption rates of certain medications for example. Play it safe.
1) BEHAVIORAL ECOLOGY AND SOCIOBIOLOGY, 23(1):21-26, "Evolutionary costs of aggression revealed by testosterone manipulations in free-living male lizards"
2) Rev. Bras. Cienc. Avic. Jan./Mar. 2006, 8(1), "Aggressive behavior in the genus Gallus sp"
3) Arch Gen Psychiatry. 2000, 57:133-140, "Effects of Supraphysiologic Doses of Testosterone on Mood and Aggression in Normal Men"
4) Aggression and Violent Behavior, Nov-Dec 2001, 6(6):579-599, "The relationship between testosterone and aggression: a meta-analysis"
5) Physiol Behav, 2002 Apr 1, 75(4):557-66, "Exogenous testosterone, aggression, and mood in eugonadal and hypogonadal men"
|WHAT LOW T DOES:|