the only things I've read are that prolong use of high dosages of magnesium aspartates greater than 350 milligrams daily can lead to diarrhea . and zinc can lead to nausea, vomiting and gastrointestinal discomfort. Other adverse reactions include a metallic taste, headache and drowsiness. There are some reports of decreased HDL-cholesterol in those taking high doses of zinc +30mg.
and most ZMA is
Zinc 30 MG
Magnesium 450 MG
Vitamin B6 10.5 MG
don't worry about B vitamins, they are water soluble and just get pissed out if there is too much..
also remember that you are getting these minerals and vitamins in everyday foods so it would ultimately depend on how your body uses in working out, to the amount you give it..
if you want I can post the findings.
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