Are you sure? As a counter anecdote, I was diagnosed with low testosterone and went on replacement therapy. The injections were enough that my numbers in blood

Are you sure? As a counter anecdote, I was diagnosed with low testosterone and went on replacement therapy. The injections were enough that my numbers in blood tests were up by a factor of three even a week after the injections. Certainly right after the injections my numbers would have been even higher. Despite this large change, I noticed no difference. I got more erections at night, that was it. I hypothesize that sleep, diet and exercise can improve your mood through a whole bunch of factors, with testosterone playing an overstated role. Or even a reverse causation: improved confidence leading to higher T perhaps. I've since stopped taking the injections as it simply wasn't doing me any good.