OP is asking for supplements specifically. It's a bit presumptive to assume he's not already maximizing things like sleep, diet, etc.
The best supplements for raising libido are panax ginseng, KSM-66 ashwaganda, yohimbine, tyrosine, cistanche. Fadogia and tongkat ali should as well since they're proven to raise T.
Then there's also some supplements/nootropics that are more recreational. Hands down, the best way to raise libido is phenibut, but i only advise taking 1-2g every other week at most. Only take it if you have a girl you've already banged come over to fvck.
We can also get into the RC territory but I haven't ventured here. I've heard melanotan II raises libido substantially.
Not exactly. Physiology influences your libido. If you get rock hard at the mere sight of a hot girl, you will naturally be more horny.