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 183 reviews
Karen Folb
Good value for the money.

Good value for the money.

Jeannette Engelbrecht
Magnesium oxide

After surgery this was suggested to prevent constipation from opioids for pain. I’ve cutback on it, but continue for regularity. It also suppose to help with sleep. I recommend this product.

Use for constipation

These work very good for constipation and can replace phillips milk of magnesia with a cheaper version.

Debra Walker
I went"one up" with supplements

This product has helped towards the betterment of my health and I will continue to use it.

Easy to swallow and better absorption

Easy to swallow and better absorption being a powder.



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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