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Product Review: Magnesium Supplement Reviews and Quality Ratings |
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HOW PRODUCTS WERE EVALUATED:
How Products were Selected:
Products were selected to represent the majority of those commonly sold and/or available nationally in the U.S. ConsumerLab.com purchased products on the open market through retail stores, on-line retailers, and direct sales or multi-level marketing companies. Products were not accepted directly from manufacturers.
Testing Methods:
Products were tested for the ability to disintegrate, the amount of magnesium, and the amount of lead. Analyses for magnesium and lead were first performed using an ICP-MS (Inductively Coupled Plasma-Mass Spectroscopy) method in an independent laboratory. Products not having passing levels of magnesium or lead were then re-tested in a second independent laboratory using the similar methods and instrumentation. The identities of the products were not disclosed to the laboratories performing the testing.
Disintegration of non-chewable, non-capsule, non-enteric coated and non-time-release formulations was analyzed utilizing USP (United States Pharmacopeia) <2040> recommendations entitled "Disintegration and Dissolution of Nutritional Supplements."
Passing Score: *
To pass testing, a product had to:
- Have a minimum of 100% of its labeled amount of elemental magnesium and a maximum of 125% of this amount.
- Meet the State of California's Prop 65 limits for lead in supplements: 0.5 mcg of lead per daily serving with an additional allowance of 1.0 mcg for supplements containing 1,000 mg/day or more of elemental calcium and 0.5 mcg for supplements containing specific other minerals. For supplements not marketed for use by children, ConsumerLab.com provides an additional allowance of 0.5 mcg if containing 250 to 499 mg/day of elemental calcium or 1.0 mcg if containing 500 to 999 mg/day of elemental calcium and an allowance of 0.5 mcg for if containing one herb or 1.0 mcg for two or more herbs.
- Meet recommended USP parameters for disintegration for vitamin supplements (excluding capsule, enteric coated, chewable and time-release products).
A product passed if it passed each criterion in any one of the analyses.
* Passing scores allow for specific margins of technical error associated with each analysis.ConsumerLab.com reserves the right to disqualify a product at any time from passing its testing if it considers such product to present a safety risk or to provide misleading or inaccurate information in its labeling.
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