$4.99 Standard Shipping
Free Shipping Icon



21st Century

Magnesium Oxide

5.0 out of 5 (5)

Magnesium Oxide

Item: CNT105

  • 21st Century Magnesium Oxide

  • Essential for protein synthesis and cellular energy

  • No Sugar, Salt, Yeast, Preservatives, Artificial Flavors or Colors

400 mg 90 Tabs

Retail $6.99
In Stock
  • 21st Century Magnesium Oxide

  • Essential for protein synthesis and cellular energy

  • No Sugar, Salt, Yeast, Preservatives, Artificial Flavors or Colors
21st Century Magnesium Oxide promotes energy. Magnesium is necessary for the metabolism of calcium, Vitamin C, phosphorus, sodium, and potassium. Magnesium is also essential for nerve and muscle function.

Terms and Ingredient Definitions

Supplement Facts

Serving Size 1 Tablet

Servings Per Container: 90

  Amount Per Serving % Daily Value
Magnesium (as Magnesium Oxide 400 mg USP) 241.3 mg 60%

Other Ingredients: Calcium Carbonate, Cellulose, Stearic Acid, Kelp, Croscarmellose Sodium, Silicon Dioxide, Magnesium Stearate.

Directions: Take one (1) tablet twice daily with any meal for maximum daily results, or as directed by your healthcare provider. Do not exceed recommended dosage.

Keep out of reach of children. Do not use if product appears to be tampered with or seal is broken. Store at room temperature.

Unconditionally guaranteed for purity, freshness and label potency. No added sugar, salt, yeast, preservatives, artificial flavors, or colors.

Shipping Weight

.23 lbs

Summary of Customer Ratings & Reviews

Customer Ratings & Reviews

Rated 5 out of 5 by 5 reviewers.
Rated 5 out of 5 by Works Great I've been using this product for quite some time now. The brand gives me a high quality product that works at a very good price. August 28, 2013
Rated 5 out of 5 by not sure what to rate.. read on Doc said I need, but as instructions state and my Doc warned me, there are side effects one being diarrhea, which i had. so just be careful and don't over buy until you know. August 18, 2012
Rated 5 out of 5 by 21st Century Magnesium Oxide I think this product is very good, priced right and speedy delivery. May 5, 2012
Rated 5 out of 5 by Great Price ! Very Affordable! I share with my husband! April 9, 2012
  • 2016-05-23 T13:15:40.041-05:00
  • bvseo_lps, prod_bvrr, vn_prr_5.6
  • cp-1, bvpage1
  • co_hasreviews, tv_5, tr_5
  • loc_en_US, sid_CNT105, prod, sort_default
1-5 of 5

Why Shop Swanson® Brands?

"With my personal 100% money-back satisfaction guarantee, you have nothing to lose and great savings to gain."

Lee Swanson, Founder of Swanson Health Products

Risk-Free Purchase Guarantee

If you are dissatisfied for any reason, we'll give you a full refund and pay return shipping.

Swanson's Standards

We are dedicated to offering the highest quality products at the best price. Find out more about how we ensure such a high standard in everything we do.

Learn More
close popup
No Thanks

Your 10% Off Promo Code is on the Way! Thanks for signing up for emails.

You're now signed up to receive exclusive deals and savings opportunities!

Thanks again for connecting with us. Keep an eye on your inbox — your first coupon is on its way!

Thank You! This email address is already signed up

You are signed up for the following:

  • Offers
  • Recipes
  • E-Newsletter
  • Updates & Reminders

Thank you for your interest and be assured that you will continue to receive our emails at this address.

Look for your next communication from us within the next week.


We are having trouble processing your request.

Our apologies!

Please try again later.