ConsumerLab.com Vitamin C Testing Suggests Misuse Of USP Claim
This article was originally published in The Tan Sheet
Executive Summary
Fifteen percent - or four - of 26 vitamin C supplements did not "pass" tests to determine whether they contain the claimed amount of the vitamin and if they sufficiently disintegrate in solution, according to ConsumerLab.com. The failure rate was about the same for products claiming to meet U.S. Pharmacopeia standards and those that did not.
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MSM tests
Fifteen of 17 methylsulfonylmethane products tested meet label claims, ConsumerLab.com reports. Gas chromatography showed two failing products contained only 85%, 88% of labeled amount of MSM. Few products contained dimethyl sulfoxide, a related compound with sulfur-like odor indicative of poor manufacturing practices, online firm notes. Several products tested were included in prior reviews of glucosamine/chondroitin, vitamin C (1"The Tan Sheet" March 13, 2000, p. 7 and 2May 22, 2000, p. 10)
MSM tests
Fifteen of 17 methylsulfonylmethane products tested meet label claims, ConsumerLab.com reports. Gas chromatography showed two failing products contained only 85%, 88% of labeled amount of MSM. Few products contained dimethyl sulfoxide, a related compound with sulfur-like odor indicative of poor manufacturing practices, online firm notes. Several products tested were included in prior reviews of glucosamine/chondroitin, vitamin C (1"The Tan Sheet" March 13, 2000, p. 7 and 2May 22, 2000, p. 10)
MSM tests
Fifteen of 17 methylsulfonylmethane products tested meet label claims, ConsumerLab.com reports. Gas chromatography showed two failing products contained only 85%, 88% of labeled amount of MSM. Few products contained dimethyl sulfoxide, a related compound with sulfur-like odor indicative of poor manufacturing practices, online firm notes. Several products tested were included in prior reviews of glucosamine/chondroitin, vitamin C (1"The Tan Sheet" March 13, 2000, p. 7 and 2May 22, 2000, p. 10)