Associated risks/scrutiny: ZMA supplements are usually all-natural and there are no known negative side effects. "However, more than 350 mg of magnesium through supplementation can result in diarrhea," Broschart warns. If you are taking medication for your heart or to treat osteoporosis, you should consult your physician before supplementing with magnesium as there may be a drug/nutrient interaction. Vitamin B6 toxicity, can cause neurological effects, but this only occurs when amounts exceed 100 mg per day. Studies have found that zinc ingestion of about 60 mg per day through diet and supplementation can cause copper deficiency.
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