You realize that ZMA IS a multi-vitamin, right?
I've never considered it to be a performance-enhancing "supplement" in the same vein as Creatine, NO, etc...
It's not made with any proprietary or cutting edge ingredients. It's just basic minerals. Shown to work. And they are the most important minerals for anabolic hormone production.
I don't take a multi-vitamin, but I do take ZMA, and I'd recommend it to anyone as a "bread and butter" staple.
ZMA is not a multivitamin. Definitely not. ZMA is nothing other than Zinc, Magnesium, and Vitamin B6. It is not even a complete spectrum of minerals. Not by a long shot. ZMK, on the other hand is a complete mineral blend, with all the minerals chelated to the Krebs Cycle Intermediates. This means optimal bio-availability. Even the Vitamin B6 in the formula is available in its co-enzyme form. Again: optimal bio-availability. Beyond that, it also offers a complete complex of the full Krebs Cycle Intermediates within the blend. Once more: optimal bio-availability. Not to mention the trace minerals included. These trace minerals are usually underrated, but without them, many metabolic processes would not function optimally. Take a minute, if you would, and compare ZMK's product label with that of a standard ZMA product. Enough said!
Now to the issue of performance enhancement you raised. No one had suggested a comparison between ZMK and creatine or NO-products for that matter. They all do different things. They enhance performance in different areas. No matter how good a creatine product, for instance, is, the results it would deliver would be sub-optimal, if the necessary fundamentals in the form of minerals and multivitamins, for instance, are not available in the required amounts. I am sure you know that zinc alone, as an example, is involved in more than 200 metabolic processes in the body. ZMK supports recovery, promotes tissue repair, stabilizes the metabolism of minerals at the cellular level, promotes restful sleep, and so on. Without some of these, performance enhancement of any type, even from creatine, would be hard to sustain over time.
Finally, it is your decision, if you do not take a multivitamin. But your regular ZMA can never be a substitute for a full-spectrum mineral complex, not to mention multivitamins. Besides, supplementing only a few minerals at the exclusion of other minerals and multivitamins would, over time, lead to undesirable imbalances in many metabolic processes that require these missing minerals and multivitamins. This outcome is clearly not beneficial.