ZMA JYM Review

ZMA JYM is JYM Supplement Science’s ZMA supplement. ZMA contains specific forms of Zinc, Magnesium, and Vitamin B6 and is an effective means of supplementing these three ingredients. Unfortunately, some of the claims made about ZMA are a bit over-blown…



A 2000 study from the “Journal of Exercise Physiology” found that 8 weeks of ZMA supplementation in college athletes undergoing a rigorous training program significantly increased Testosterone compared to subjects taking a placebo.

This study is often THE study that is cited as “proof” that ZMA increases Testosterone. The only issue is that there is one MASSIVE conflict of interest here. That is, this particular study was funded by Snac Systems, the company which originally developed ZMA. Furthermore, one of the study’s authors, Victor Conte, has a considerable equity stake in Snac Systems.

If more studies corroborated the findings of this study, the conflict of interest could be over-looked. However, ZMA has failed to influence Testosterone in two later studies.
A 2004 study, published in the “Journal of the International Society of Sports Nutrition”, found no influence on Testosterone levels in individuals consuming ZMA for 8 weeks.
A similar failure occurred in a 2007 study, published in the “European Journal of Clinical Nutrition”.


A 2007 study from “Neuro Endocrinology” found that exercise significantly depleted Testosterone levels in male subjects and that Zinc supplementation was able to prevent this decrease.
These results indicate that Zinc supplementation is an effective means of encouraging optimal Testosterone levels which might otherwise become depleted.


A 1992 study, published in the “Journal of the American College of Nutrition” found that Magnesium (as Magnesium Oxide) supplementation resulted in a minor, though statistically insignificant, increase in Testosterone in healthy subjects.

A more recent (2011) study from “Biological Trace Element Research” yielded similar results, and noted that Magnesium increased Testosterone more in exercise subjects than in sedentary ones.

Overall, the research indicates that, while Magnesium may play a role in normalizing and possibly increasing Testosterone, any increases are likely to be small and have much to do with initial Magnesium status (deficient or not).

Given that Magnesium is a relatively common deficiency, athletes supplementing with Magnesium is certainly not a bad idea.


The evidence for ZMA as a means of outright “boosting” Testosterone is tenuous at best. However, ZMA supplementation is a fine method of ensuring adequate Zinc and Magnesium intake, two minerals that are downright essential for any athlete and have both been shown to be depleted by rigorous exercise. The degree of benefit provided by ZMA JYM will depend on individual Zinc/Magnesium status prior to supplementation. At $15 per 90 serving bottle, ZMA JYM is very competitively priced relative to other ZMA supplements, and should be considered by anyone looking for a reliable ZMA supplement with no added ingredients (other than BioPerine for absorption).

  1. Brilla, L. R., and Victor Conte. “Effects of a novel zinc-magnesium formulation on hormones and strength.” J Exerc Physiol Online 3.4 (2000): 26-36.
  2. Wilborn, Colin D., et al. “Effects of zinc magnesium aspartate (ZMA) supplementation on training adaptations and markers of anabolism and catabolism.” J Int Soc Sports Nutr 1.2 (2004): 12-20.
  3. Koehler, K., et al. “Serum testosterone and urinary excretion of steroid hormone metabolites after administration of a high-dose zinc supplement.”European journal of clinical nutrition 63.1 (2007): 65-70.
  4. Kilic, Mehmet. “Effect of fatiguing bicycle exercise on thyroid hormone and testosterone levels in sedentary males supplemented with oral zinc.” Neuro endocrinology letters 28.5 (2007): 681-685.
  5. Cinar, Vedat, et al. “Effects of magnesium supplementation on testosterone levels of athletes and sedentary subjects at rest and after exhaustion.”Biological trace element research 140.1 (2011): 18-23.
  6. Brilla, Lorraine R., and Timothy F. Haley. “Effect of magnesium supplementation on strength training in humans.” Journal of the American College of Nutrition 11.3 (1992): 326-329.

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