When these materials are intended for use as pharmaceutical ingredients or in drug manufacturing, FDA oversight applies. Importers should be prepared to demonstrate the intended use and comply with applicable drug GMP requirements; consult a licensed customs broker or regulatory counsel before shipment.

Natural musk in its raw, unprocessed form falls under heading 0510 as an animal product for pharmaceutical or similar use. Once it has been processed into a perfumery compound or blended into a fragrance preparation, it would move to the chapters covering essential oils or perfumery products.