
Organic Trade Association (OTA) is a membership-based business association that focuses on the organic business community in North America.
PO Box 547
Greenfield, MA 01302
413-774-7511
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Allowed and Prohibited Substances
With input from the NOSB, the Secretary of Agriculture drafts the National List of Allowed and Prohibited Substances. This is the list of exceptions to the general requirement that natural materials are allowed and synthetic materials are prohibited. In other words, the national list is a list of prohibited natural materials (such as arsenic), and allowed synthetics (such as pectin, baking soda, and Vitamin C). Even though a synthetic may be allowed for one purpose does not mean that it is allowed for every possible use, so farmers and manufacturers need to pay careful attention to the usage restrictions mentioned in the regulations. Another central source for information on and listings of materials and processes allowed in organic production is the Organic Materials Review Institute, and you'll find a link to their web site below.

Resource Listing
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