Optimum Nutrition


Zinc Monomethionine Aspartate
Support Testosterone Levels And Muscle Strength!*
8.2 out of 10  (403 Reviews)
2 Sizes
90 Capsules
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Product Overview

A synergistic combination of Zinc Monomethionine Aspartate, Magnesium Aspartate, and Vitamin B6 may significantly increase anabolic hormone levels and muscle strength in well-trained athletes.* The novel Zinc Monomethionine Aspartate formula may also help to support endurance, growth and restful sleep.*

Beyond The Basics
  • Contains the PATENTED BLEND of Zinc, Magnesium, and Vitamin B6
  • May Increase Testosterone Levels and Muscle Strength in Well-Trained Athletes*
  • May Offer Even Better Results When Stacked with Creatine, Glutamine, HMB, or Other Strength & Recovery Products*

Behind Optimum with Jennifer Delgado

For NPC Figure competitor Jen Delgado, intense training is everything. Learn why no one should fear lifting weights, how to train for explosive results, and check out Jen's first-rate, fully-loaded supplement stack. It's ON.

Video Length | 3:38

Ratings & Reviews

Overall Rating
403 Ratings
Verified Buyer Rating
116 Ratings
By clicking the button above, you agree to entering the Reviews section. Products in the Store are not intended to diagnose, treat, cure, or prevent any disease.
Verified Buyer

Another excellent product from ON Nutrition- and they do help me sleep better.


I get very good sleep from this zma. I gave it a while to see if my body would get used to it before it stopped working and it is still pretty effective.

Verified Buyer

Excellent mineral supplement..I take it as the label recommends..great recovery..I sleep better ..I'm not sure about it being a test booster though...and anything optimum nutrition puts on the know it's gonna work!

Verified Buyer
No written review.

I take 3 capsules before bed every night. I find that since taking the product I sleep far deeper then I have in the past. I was in the military for ten years and suffer from insomnia. I find that when I take this product I wake up far fewer times and I wake up rested in the morning ready to go. I haven't taken the product long enough to see the testosterone benefits associated with ZMA. Currently I'm cutting so mass gains are not the goal. I do however find that my overall workouts have improved and I'm currently getting in the best shape of my life. I can't single this product to this but along with the other supplements I'm taking and the hard work I put it- it's all working and so I don't plan on changing anything with the current supplement regime I have.

† This price is the retail price for this product found at one or more retail websites in the last 30 days. The price may not include shipping cost, tax, sale or promotional prices, or discounts such as member pricing. Prices may change. verifies this price every 30 days.
90 Capsules
90 Capsules
30 Servings | $0.42 Per Serving
180 Capsules
180 Capsules
60 Servings | $0.37 Per Serving

What's in Optimum Nutrition ZMA

90 Capsules
Serving Size 3 Capsules
Servings Per Container 30
Amount Per Serving % Daily Value
Vitamin B6 (as pyrodoxine HCl) 10.5 mg 525%*
Magnesium (as aspartate) 450 mg 113%*
Zinc (as aspartate and monomethionine) 30 mg 200%*
* Percent Daily Values are based on a 2,000 calorie diet
Other Ingredients:
Gelatin, Microcrystalline Cellulose, Magnesium Stearate, Magnesium Oxide, Zinc Oxide

Directions For ZMA: Men: Take 3 capsules, preferably on an empty stomach, before bed.
Women: Take 2 capsules, preferably on an empty stomach, before bed.

Warnings: Consult your physician before using this product if you are taking any medications or are under a physician's care for a medical condition. Not for use by those under the age of 18 or women that are pregnant, trying to get pregnant, or nursing.

* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
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