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The possible side effects of taking too much of this supplement include:
- Zinc: More than 50 mg daily often increases the need for dietary copper; more than 100 mg daily might cause toxic symptoms.
- Magnesium: More than 1000 mg daily might cause diarrhea.
- Vitamin B6: More than 200 mg per day may cause nerve pain in the extremities (peripheral neuropathy).
One study found that ZMA increases anabolic hormones and strength1. While their results show statistically significant
differences between the ZMA and placebo groups following 8 weeks of intensive training (higher testosterone levels and greater
increases in strength), these results have been questioned.
The beginning levels of zinc and magnesium in these athletes' blood were already low. Increased exercise
raises the body's need for zinc in a variety of ways. The fact that levels of zinc and magnesium dropped in the control groups'
blood (to 0.8 mcg/ml of zinc and 18.0 mcg/dl of magnesium) shows that the increased exercise had this expected effect.
All of which means that both groups needed more of these essential minerals, probably even before the intensive training, but
only one group got it.
What happened here can be understood if one thinks about the normal diet eaten by members of a University football team who were
the study's subjects. Their diet is probably low in zinc, magnesium and B6, if not actually deficient -- which is probably true
for most unsupplemented people in the United States. High protein intake (undoubtedly consumed by these football players)
increases the need for B6, and zinc is particularly important for protein (muscle) synthesis.
1L. R. Brilla, Western Washington University, Bellingham, WA, and V. Conte, BALCO Laboratories, Burlingame, CA.
Flexstar guarantees that our products meet their label claims 100%.
This product is not intended to diagnose, treat, cure, or prevent any disease.
Results may vary when used in conjunction with a daily exercise program and
balanced diet. Always check with your physician before starting a diet or exercise program.
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