Testosterone is dependent on a number of things (age, lifestyle, diet, etc). And there is certainly no shortage of bullshit, pseudo-science claims that this supplement or that supplement will boost your testosterone, often with a clear "get a better boner and have more success with women" vibe. If you're concerned about testosterone levels, best thing is to talk to your doctor, who will give you a clear answer.
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this article might help in the meantime.