Wow... Black maca

I'm pretty new to this. Recently started a stack which is 3000mg of l-citruline, 40mg of zinc,1000mg pygeum,3000mg black maca, 3600mg of sunflower lechitin and 2000ug of vitamin d with some K2

Of course I'm new and I've been abstaining since I've started the stack (yesterday morning for me so I've now done 2 cycles as I'm just about to go to bed) and my goodness.... Already I've noticed black maca taking effect My libido is definitely up (mind you I'm 22 and I consider myself to already have a high one) Just absolutely rock hard But im not sure if this is either excitement from the stack and therefore placebo or like it works this quickly (black maca that is) Any comments?