This thread would be more appropriate reposted in the Biotest Supplement Advice forum.
Libido isn’t necessarily a symptom of low testosterone. Body fat certainly isn’t either.
There are definitely some junk Test boosters around with crap ingredients or, worse, kitchen sink formulas containing trace amounts of every herb and mineral that was ever vaguely connected to possibly-maybe-slightly raising Testosterone.
Alpha Male has been around for years and guys have gotten good results with it. If you’re natural Test is normal or on the low end of normal, you should feel some benefit. If you’re naturally running high, then you won’t see much, which is why guys in their 20s generally aren’t recommended to use Test boosters.
At the end of the day, if you’re taking it, give it a solid shot. Follow the label directions and see how you feel for a month or so, then wait a few weeks and get bloodwork done to see where your natural levels are, and go from there.