Tyrothricin Powder from Mexico
Tyrothricin, a natural antibiotic complex from Bacillus brevis containing gramicidin and tyrocidine, used in topical antimicrobials. Falls under HTS 2941.90.10.50 as other natural antibiotics, being a separate chemically defined mixture of isomers from chapter note (b). Primarily imported as bulk powder for formulation.
Duty Rate — Mexico → United States
0%
Rate breakdown
9903.05.860%Universal product exemption (U.S. note 52(b))
Import Tips
• Provide mass spectrometry data showing gramicidin/tyrocidine ratio typical of natural extract
• Declare as mixture of isomers per chapter note (b) to justify Chapter 29 classification
• Ensure not pre-mixed with carriers, which would shift to Chapter 30 medicaments