The National List of Allowed and Prohibited Substances identifies generic substances that may and may not be used in organic crop and livestock production. It also lists the substances that may be used in or on processed organic products.
Transition to Organic Partnership Program
TOPP is a network assembled by the USDA’s National Organic Program to support transitioning and organic producers with mentorship and resources.
The National List of Allowed and Prohibited Substances identifies generic substances that may and may not be used in organic crop and livestock production. It also lists the substances that may be used in or on processed organic products.