Product Tests Select a Review CL Answers  Warnings  Encyclopedia Where to Buy News

ConsumerLab.com Answers  

Magnesium Recommended Intake and Upper Limit

Question:
How can the Recommended Daily Allowance (RDA) for magnesium be higher than the Upper Tolerable Intake Level (UL)? That is, how can an amount which is healthful also put you at risk for harm?

Answer:
It is true that, at first glance, there seems to be a contradiction. For example, the UL for magnesium (above which the risk of adverse effects increases) is 350 mg per day for adults and children over age 8, but the RDA (the amount one needs) can be as high as 420 mg for many people within this group depending on gender and stage of life.  However, the magnesium one consumes from food does not count toward the UL; only magnesium from supplements and medicine can cause adverse effects and counts toward this limit. So, as long as you're not getting more than 350 mg of magnesium per day from supplements and/or medicine and are getting some magnesium from foods (like whole grains, nuts, beans, and green leafy vegetables) you can satisfy the RDA without exceeding the UL.

For more about this, see the "What to Consider When Using" section of the Magnesium Supplements Review.

The ULs established for niacin and folate also only apply to the amounts consumed from supplements and fortified foods and not from foods naturally containing these vitamins. For vitamin E, the upper limit is higher for the natural form than the synthetic form.

For recommended daily intakes and upper limits for these and other nutrients, based on gender and stage of life, see ConsumerLab.com's Recommended Daily Intakes and Upper Limits page.

Learn more about magnesium:



Do magnesium supplements, like Magtein, help memory or protect against Alzheimer's disease? >>

Which is the best form of magnesium to take - one that contains the most magnesium and is best absorbed? >>

Is it important to take calcium and magnesium together? >>

Is it true that I should not keep magnesium supplements in a daily pill pack mixed with other supplements and medicines? >>

Help! How do I know how much magnesium I am actually getting from my supplement? The label says it contains 500 mg of magnesium "as magnesium citrate" -- but how much of that is magnesium and how much is citrate? >>

Is there an accurate test for magnesium deficiency? >>

Are there drug interactions with magnesium supplements? >>

Do any supplements help for restless legs syndrome? >>

I've read that magnesium deficiency is rare but also that most people don't get enough magnesium. How can these both be true? >>

Do magnesium creams, sprays and oils really work? >>

See other recent and popular questions >>
COMMENTS


Share your thoughts and comments about this topic in the space below. Please abide by the following rules:
  • If you make a statement of fact, such as whether a type of treatment does or does not work, state your basis -- such as personal experience or a published study.
  • If you make a positive or negative comment about a product, note whether or not you have a financial interest in the product or in a competing product.
  • Please be respectful in your tone.
  • Please do not submit any type of HTML markup or scripting as it will not be accepted, nor will comments that exceed 2,500 characters.
Comment:

Share your thoughts and comments about this topic in the space below. Please abide by the following rules:
  • If you make a statement of fact, such as whether a type of treatment does or does not work, state your basis -- such as personal experience or a published study.
  • If you make a positive or negative comment about a product, note whether or not you have a financial interest in the product or in a competing product.
  • Please be respectful in your tone.
  • Please do not submit any type of HTML markup or scripting as it will not be accepted, nor will comments that exceed 2,500 characters.
Comment:

You can modify your comment below. Please be aware the comment will have to approve the changes before they will be shown:
Comment:

Your edit has been submitted and is being reviewed by ConsumerLab.com prior to publication.
This CL Answer initially posted on 7/14/2015. Last updated 8/3/2017.
ConsumerLab.com members may submit questions to CLAnswers@ConsumerLab.com. We read all questions and try to answer those of popular interest.

 
Popular Reviews
CoQ10 and Ubiquinol Supplements
CoQ10 and Ubiquinol Differ in Quality, Absorption & Cost
Turmeric and Curcumin Supplements and Spices
31% of Turmeric/Curcumin Products Fail CL's Tests
Magnesium Supplements
Avoid Magnesium Supplements With Problems


ConsumerLab.com Encyclopedia

In addition to our product reviews our encyclopedia covers the following:

Follow us on...

 
 
Join |  Sign In
   
Join Us on Facebook! Join Us on Instagram! Join Us on Twitter! Join Us on Google+! Join Us on YouTube! 
Product Tests
Brands Tested
Health Conditions
Encyclopedia
CL Answers
Clinical Updates
News
Recalls & Warnings
RDAs
Where to Buy Products
Raw Materials Tests
Testing Program
How Products Were Tested
Join CL Today
Testimonials
Join Free Newsletter
Group Subscriptions
Gift Membership
About Us
The CL Seal
CL Survey
Privacy Policy
Sitemap
Contact Us/Help

©2018 ConsumerLab.com, LLC. All rights reserved. A single copy of a report may be printed for personal use by the subscriber. It is otherwise unlawful to print, download, store or distribute content from this site without permission.
ConsumerLab.com name and flask logo are both registered trademarks of ConsumerLab.com, LLC. This site is intended for informational purposes only and not to provide medical advice.