Kirkland Signature Organic Multivitamin is held to the highest organic standards set by the National Organic Program (NOP), which is the organic regulatory division of the USDA. This means the plants used in our product are grown only with NOP approved substances. The USDA organic seal represents that the farmers growing the Kirkland Signature Organic Multivitamin plants follow strict NOP standards for organic soil preservation. The standards require soil fertility and crop nutrients to be managed in a way that maintains or improves soil organic matter content.