Optimum Nutrition On ZMA New EU Produced Capsules - Pack of 90

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Interestingly, copper levels played a role in sleep quality as well, and copper is known to compete with zinc for absorption. So much so, in fact, that supplementing with too much zinc can actually depress copper levels over long periods of time. Wada, L. and King, J. C. Effect of low zinc intakes on basal metabolic rate, thyroid hormones and protein utilization in adult men. J Nutr. 1986 Jun;116(6):1045-53. Six athletes in each group is exceptionally small, even for a nutrition study (a field that’s infamous for small sample sizes to begin with). Alternatively, this might be a manifestation of a different theory: that ZMA does not benefit athletes who have a healthy diet and normal levels of micronutrients in their body already. Key Ingredients:25mg vitamin B6, 422mg magnesium, 50mg zinc, 1000mg l-taurine, 500mg l-theanine, 500mg l-tryptophan, 3mg melatonin

Optimum Nutrition, Zinc Magnesium Aspartate, 180 Capsules Optimum Nutrition, Zinc Magnesium Aspartate, 180 Capsules

ZMA could boost your testosterone levels. It’s no accident that two of the primary ingredients in ZMA are closely linked to testosterone levels. As mentioned above, zinc is an essential mineral that helps keep your immune system healthy, according to the National Institutes of Health(NIH). Zinc also helps your body heal and repair. Considering this mineral is so important for your body’s daily functioning, deficiency can be a problem. Not getting enough can negatively affect your ability to fight disease and your digestive, reproductive, and central nervous systems. Met-Rx has a pretty standard ZMA formulation, though it’s more difficult to endorse than some of its competitors simply because it doesn’t have the same reputation as a solid manufacturer of other quality sports supplements.There’s not a ton of firm research that suggests ZMA supplements can actually benefit your physical performance. With that said, this supplement contains essential vitamins and nutrients that can help fill gaps in your daily diet. References What’s more, a study in 14 healthy men who exercised regularly showed that taking a ZMA supplement daily for 8 weeks did not raise total or free blood testosterone levels ( 13). Golf, S. W., et al. On the significance of magnesium in extreme physical stress. Cardiovasc Drugs Ther 1998:12:197-202. While there isn’t any direct research on how vitamin B6 affects hormone levels or athletic fitness, it’s likely that athletes who are deficient–such as bodybuilders trying to cut weight–will experience performance decrements as a result.

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Numerous research studies have suggested that zinc and magnesium help enhance muscle size, muscle strength, and fat loss, not to mention overall health and well-being.* Kwun, I. S., et al. Marginal zinc deficiency in rats decreases leptin expression independently of food intake and corticotrophin-releasing hormone in relation to food intake. Br J Nutr. 2007 98(3):485-9.

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Other research has found a similarly insignificant effect from ZMA on testosterone. A scientific paper published in the Annals of Biological Research in 2013 by a team of researchers in Iran examined the effects of a ZMA supplement on performance and anabolic hormone levels in weightlifters ( 6 ).