Most studies done on ZMA are in zinc/magnesium deficient athletes. Magnesium is an important mineral in energy production as zinc is also important for immunity and testosterone. If you are deficient in these, which some athletes tend to be due to high stress demands such as lifting and lots of cardio then ZMA will help. I personally take it for the crazy dreams it gives me but I'm sure i get enough zinc and magnesium in the diet.
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