Did You Know That the United States Pharmacopeia (USP) has Changed the Heavy Metals Chapter Effective January 1 2018? By Danina Rinaldi The USP has been working on changing the guidelines for testing heavy metals for several years. More specifically, the USP chapter to change will be <231> . The new USP chapters that will [...]The post Did You Know That the United States Pharmacopeia (USP) has Changed the Heavy Metals Chapter Effective January 1 2018? appeared first on Gibraltar Laboratories.