Product Tests Select a Review CL Answers  Warnings  Encyclopedia Where to Buy News
In the News - Press Coverage     Testimonials     Press Releases


WHITE PLAINS, NEW YORK — OCTOBER 30, 2007 — reported today that its tests of magnesium supplements revealed one product to contain only 46.4% of its claimed amount of the essential mineral, despite boasting a "GMP" (Good Manufacturing Practices) seal on its label. None of the products were contaminated with lead — a problem identified in two supplements in's previous review magnesium supplements in 2005. Over $200 million of magnesium supplements are sold annually in the U.S. according to Nutrition Business Journal. Magnesium supplements can help prevent migraine, menstrual pain, and magnesium deficiency. Certain forms of magnesium are key ingredients in popular laxatives.

The report, available at includes findings for fourteen selected by as well as six that passed's Voluntary Certification Program. Also listed are three products similar to ones that passed but sold under different brand names. Included are products from Andrew Lessman, Baywood, Blaine, Cardiovascular Research, Doctor's Best, Floradix, Life Fitness, Maginex, Maxi-Health, Natural Factors, Nature Made, Nature's Bounty, New Chapter, Puritan's Pride, Swanson, Slow-Mag, The Vitamin Shoppe, Tropical Oasis, Vitamin World, and Walgreens. The report also provides information regarding the proper selection and use of magnesium supplements, including differences among the chemical forms in which magnesium supplements are sold. is a leading provider of consumer information and independent evaluations of products that affect health and nutrition. Reviews of popular types of vitamins, supplements, and generic drugs are available at Soon to be released are new Product Reviews of omega-3 and -6 fatty acids, potassium, resveratrol (red wine extract), and turmeric. Subscription to is available online. The company is privately held and based in Westchester, New York. It has no ownership from, or interest in, companies that manufacture, distribute, or sell consumer products.

For further information, contact Tod Cooperman, MD, at

— END —

back to top


Follow us on... Encyclopedia

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

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
CL Answers
Clinical Updates
Recalls & Warnings
Where to Buy Products
Raw Materials Tests
Testing Program
Join CL Today
Join Free Newsletter
Group Subscriptions
Gift Membership
About Us
The CL Seal
CL Survey
Privacy Policy
Contact Us/Help

©2018, 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. name and flask logo are both registered trademarks of, LLC. This site is intended for informational purposes only and not to provide medical advice.