20 is still pretty young, so you probably wouldn't notice a significant difference with Alpha Male or any other Test booster. I'd file it under "unnecessary" for the time being. Not like it's a "dangerous" idea to use one now, just that you probably wouldn't see measurable results unless you had a pre-existing health issue that lowered your levels, which (hopefully) isn't the case.
Using a Test booster at age 30+ is like driving 35mph and then speeding up to 55mph. Using a Test booster just after your teen years would/should be like driving 50mph and then speeding up to 55. Make sense?
On a side note, it's kinda tripping me out that you're using a Nate Green picture as an avatar. Weird.