ConsumerLab.com Finds Magnesium Product Problems

WHITE PLAINS, N.Y.—In its latest round of finished supplement testing, ConsumerLab.com only nine of twelve magnesium supplements tested met quality standards, with one supplement containing only 45.4 percent of its labeled amount of magnesium, despite boasting a Good Manufacturing Practice (GMP) seal on its label. Similarly, one supplement provided only 28.8 percent of its per tablet labeled content, while another product contained an amount of lead high enough to warrant a warning label in California under that state's prop 65 regulation.

ConsumerLab.com’s posted its review of magnesium supplements on its Web site; it includes findings for the twelve products selected by ConsumerLab.com, as well as for seven that passed ConsumerLab.com's Voluntary Certification Program. Also listed are two products similar to ones that passed but sold under different brand names. The report also provides magnesium supplement comparisons, magnesium supplement ratings on quality, and information regarding the proper selection and use of magnesium supplements, including differences among the chemical forms such as magnesium citrate, magnesium gluconate, magnesium hydroxide, magnesium oxide, and amino acid chelates.