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Product Review: Magnesium Supplements |
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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 purity standards for contamination by lead: less than 0.5 micrograms per daily serving in magnesium-only products (Reference: State of California, Proposition 65) or less than 1.5 micrograms per daily serving in magnesium products also containing 1000 mg of elemental calcium.
- 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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