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Testosterone therapy can occur in many forms, from injectable and transdermal creams and patches and even subcutaneous pellets implanted under the skin. In the end it is true, with each form of therapy you are receiving the same testosterone hormone but the efficiency and effectiveness of each form varies greatly. Without question injectable testosterone is the most efficient and effective form of testosterone therapy, as through injections the needed testosterone is placed directly into the blood. While transdermal medications will absorb into the blood many men find difficulty in achieving proper levels with this form making it the least desirable of the four. If injections are not an option for whatever reason testosterone implant pellets are a fine choice and often all the testosterone an individual will need.
But I'm not more aggressive—a behavior change often tied to testosterone. That's not surprising to Robert Sapolsky, ., a neuroendocrinologist at Stanford University and a leading researcher on stress and behavior. "It's really not the case that testosterone 'causes' aggressive behavior," he says. "Instead, it makes the brain more sensitive to social cues that trigger aggression. And in support of that, a guy's testosterone level isn't a very good predictor of how likely he is to be aggressive."