Nutricost Magnesium Oxide Capsules

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Regular price $14.95


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Magnesium Oxide is a readily absorbed form of magnesium, one of the most important minerals in the human body. More than 800 essential biochemical functions in your body are dependent on magnesium, and yet as many as 50% of Americans don’t get enough magnesium to sustain optimal health. 

The modern diet is heavily reliant on processed foods, and processed foods contain very little magnesium. Did you know that whole wheat retains only 16% of its magnesium content after being processed into flour? This type of nutrient depletion is happening all over the food pyramid.

Magnesium oxide is commonly used to treat migraines, constipation, high blood pressure, low blood sugar, and anxiety.*

 Nutricost Magnesium Oxide Capsules 

  • Extra Strength Magnesium Oxide Supplement
  • 750mg of Magnesium Oxide Per Capsule (420mg of Magnesium)
  • 240 Servings Per Bottle
  • Non-GMO, Gluten-Free
  • Made in a GMP Compliant, FDA Registered Facility

Q & A

Does this Magnesium Oxide have 750 mg or 420 mg of magnesium per serving? Why does it mention both numbers?

  • The amount of Magnesium per capsule is 420mg, the amount of Magnesium Oxide 750mg. 


Are the capsules soft gel and are they vegetarian?

  • Yes, the capsules are soft gel and are animal-sourced. When Nutricost uses an animal source gelatin capsule it is always bovine, never porcine. 


Who tests Nutricost’s Magnesium Oxide supplement?

  • We use ISO accredited third-party labs to validate the potency, purity, and integrity of all Nutricost products.


What are the safety and quality standards for this product?

  • Nutricost values quality above all else and sets exacting standards based on industry best practices, state and federal guidelines, and consultation with scientific research and analysis.


Anything else I should know? 

  • As a dietary supplement, take 1 capsule with 8 ounces of water, preferably with a meal.


Customer Reviews

Based on 236 reviews
Motor City Madman
great supplement

great supplement

Cheap and Same product

This product is just as good as walmart, except you get more off here for cheaper

Bobby C.
Not the best one in my opinion

One star for deceptive labeling. As you can see with the pictures that have already been posted, the front label of 750 mg per serving does not match the actual amount of 420 mg per serving on the back label. I have used another product (MagO7) for years and love it. Thought I'd try something cheaper. Not a good idea. It didn't work as well even when I took two to make up for the mislabeling. Just bought more of my tried and true MagO7 and will throw this out when the good one comes.

D. D.
A bit confused by the difference in mg listed.

I'm a bit confused by the difference in mg listed. . . The container lists two mg amounts. Nutricost Magnesium Oxide 750mg, 240 Capsules - 420mg of Magnesium. Can the manufacturer or any one clarify this discrpepancy? How can one table capsule have both 750mg of Magnesium oxide and 420 mg of Magnesium?

Broken capsules

I am a quarter of the way thru the bottle. I have removed 13 broken capsules. That's just unacceptable



In the unlikely event that you’re not completely satisfied with ANY Nutricost™ product, we don’t want to keep your money. Even though our products are of the utmost quality, no supplement works for everyone. Contact us and we’ll refund 100% of your purchase price (minus S&H).

Have questions about our products? Want to leave a comment about our service? Simply fill out the form below and one of our customer service representatives will contact you shortly.

If you wish to speak with a representative of the Company feel free to call (866-438-3694) or send us an email at with any and all questions or concerns related to our products and services


Our goal is to have your order processed within 1-2 business days depending on production of items ordered, size of order, and availability. Once Shipped, usually takes 3-5 business days for shipment to be received. (International orders may take longer due to customs).We try to get your order shipped as fast as possible while still upholding to our standard of quality.

Due to certain circumstances out of our control shipping times may vary.

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