We make sure all of our products pass the ANSI 173 safety guidelines for heavy metals, as set by the National Sanitation Foundation/American National Standards Institute. In setting their standards, the NSF took into consideration regulatory values and guidelines from around the world, including the U.S. EPA, Health Canada, Australia/New Zealand, Food and Agricultural Organization (FAO), World Health Organization (WHO), U.S. FDA, ATSDR, European Agency for the Evaluation of Medicinal Products, International Pharmacopoeia, Expanded Commission E Monographs, U.S. Pharmacopoeia, European Pharmacopoeia, American Herbal Pharmacopoeia, British Pharmacopoeia and California EPA Proposition 65.