Just a stupid, really dumb question, but... why do you want to "boost" your testosterone -"naturally" or not- in the first place?
You realize men lived for a looong time without needing any "testosterone booster" right?
Too much competition, stress, in the "modern" era? Not being able to cope with an overwhelming amount of daily frustrations? Going that route is equivalent of doing drugs/alcohol/insert random destructive addiction to cope with something because your thought process/family support arent strong enough.
Decreasing testosterone levels in your 30s is a normal biological process. You re not supposed to act like a teen when you re in your 30s. You re suposed to be wiser, calmer, quieter, to take care of kids and family for example, and to hold a job without blowing a gasket every other week.