Magnesium Supplements Reviewed By ConsumerLab.comProduct Reviews
Magnesium and Calcium-Magnesium Supplements Review

Find the Best Magnesium Supplement

Tests and Reviews of 40+ Popular Magnesium Supplements & CL's Top Picks

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Brands compared in report

AdvoCare Calcium Plus
AlgaeCal Plus
Bluebonnet EarthSweet Chewables Calcium Magnesium & D3
Caltrate 600 + D3
ChildLife Liquid Calcium With Magnesium
Country Life Chelated Magnesium
Country Life Target-Mins Calcium Magnesium
Doctor's Best High Absorption 100% Chelated Magnesium
Douglas Laboratories Magnesium Taurate
Dr. Mercola Magnesium L-Threonate
Finest Nutrition [Walgreens] Calcium, Magnesium & Zinc
Finest Nutrition [Walgreens] Magnesium
Finest Nutrition [Walgreens] Magnesium 400 mg
Garden of Life Dr. Formulated Magnesium Relax & Restore
GNC Magnesium 500
Jarrow Formulas Bone-Up
Jarrow Formulas Magnesium Optimizer
Jigsaw MagSRT
KAL Magnesium Glycinate
Kirkland Signature [Costco] Calcium Citrate Magnesium And Zinc
Life Extension Magnesium Caps
MAGINEX Advanced Magnesium
Mag-Tab SR
Metagenics CalApatite Bone Builder With Magnesium
Natural Factors Magnesium Oxide
Natural Vitality Natural Calm
Nature's Bounty Calcium Magnesium Zinc
Nature's Bounty Magnesium
Nature's Life Magnesium Malate
Nature's Plus Animal Parade® Mag Kidz
Nature's Way Alive Calcium Bone Formula
NOW Magnesium Caps
NutriCology Magnesium Chloride Liquid
Piping Magnesium Chloride
Pure Encapsulations OsteoBalance
Puritan's Pride Chelated Calcium Magnesium Zinc
Puritan's Pride High Potency Magnesium 500 mg
ReMag Magnesium Solution
Rexall Magnesium
Solgar Magnesium Citrate
Spring Valley [Walmart] Magnesium Citrate
Sundown Naturals Calcium Magnesium and Zinc
Sundown Naturals® Magnesium
Swanson Liquid Calcium & Magnesium
Trace Minerals Research Magnesium
TwinLab Magnesium Caps
USANA® MagneCal
Vitacost® Magnesium Citrate
Vital Nutrients Triple Mag
Vitamin World Calcium Magnesium Zinc
Vitamin World® High Potency® Magnesium
Wellesse Calcium & Vitamin D3

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More about this report

Magnesium supplements are available in so many different forms, dosages and ingredient combinations, how do you know which one is best for you?

To answer these questions, staff spent several months testing of over 40 popular magnesium supplements on the market (including combination products with calcium, vitamin D or vitamin K). Our tests revealed that several contained less magnesium than claimed, took longer than normally expected to break apart in disintegration testing, were contaminated with lead, or were improperly labeled. We also found that one type of magnesium supplement rapidly absorbs so much water from the air that it damages tablets and other supplements which may be nearby.
Fortunately, we also identified many high quality magnesium supplements that contained what they claimed and passed all of CL's tests — some of which provide a good dose of magnesium for just a few cents per day. 

You must become a member to get the full test results for magnesium supplements, including quality ratings and CL's Top Picks among magnesium supplements. You will get results for 47 magnesium supplements: 27 selected for testing by and 20 others that passed the same tests through CL's voluntary Quality Certification Program, as well as information about five supplements similar to ones that passed testing. 

Although most people get enough magnesium in their diets, people with diabetes, diseases of the digestive tract, and those who use medications such as Nexium and Prilosec may be at increased risk of deficiency. Magnesium supplementation may also improve glucose status in people with pre-diabetes, and may be helpful for restless leg syndrome, migraines and menstrual pain. It is also an effective laxative and antacid. However, it's important to choose supplements carefully based on your needs, as certain forms of magnesium forms are better absorbed than others or are more likely to cause diarrhea.

In this comprehensive review, you'll discover:
    • Which magnesium failed our quality ratings and which passed — including combinations with calcium, vitamin D and vitamin K
    • CL's Top Picks among the best magnesium supplements
    • Cost comparisons to help you choose a magnesium supplement offering the best value
    • The pros and cons of different forms of magnesium, including magnesium aspartate and orotate, magnesium citrate, magnesium chloride, magnesium lactate and lactate dihydrate, magnesium oxide and magnesium-L-threonate
    • How to get adequate magnesium from food
    • The causes and symptoms of magnesium deficiency
    • How much magnesium to take to treat or prevent magnesium deficiency and other conditions/li>  
    • The evidence for and against using magnesium supplements for restless leg syndrome, leg cramps, migraines and more
    • Potential drug interactions and side-effects of magnesium supplements

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(7/11/17): A company selling one of the products covered in this Review was recently sent a Warning Letter from FDA indicating that the product is being marketed online with claims regarding its ability to cure, prevent, or treat diseases, and this is not permitted for a supplement. For details, see the "Update" at the top of the full Review.

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Related questions and answers

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