ZMA is a foundational supplement as far as I am concerned. When considering noticable results and effectiveness, I personally rank it above creatine, whey, aminos, etc . If my budget was extremely tight, I would only take ZMA and a good multi.....and some multis even include a ZMA blend. If I could afford to eat strictly organic, I wouldn't even take a multi.
Know ye not that your body is the temple of the Holy Ghost which is in you, which ye have of God, and ye are not your own? For ye are bought with a price: therefore glorify God in your body, and in your spirit, which are God's. 1 Corinthians 6:19-20
I beseech you therefore,brethren, by the mercies of God, that ye present your bodies a living sacrifice, holy, acceptable unto God, which is your reasonable service. Romans 12:1