Poll: The most cost effective potentiator/tolerance reducer?

So I am low on funds and high on tolerance and trying to create an action plan. I am on 3.5 gram daily dose which I am going to decrease to once every other day...I guess.

NDMA Antagonism: Cat`s Claw, Agmatine, Magnesium Chelate, DXM (Not Keen on this one)

P450 Enzyme System: Grapefruit Juice

Other: Curcumin & Piperine, Black Seed Oil

So in your opinion which one of these would be effective in use and cost-effective?