Tryptophan from Japan
L-Tryptophan is an essential amino acid featuring an indole side chain attached to alanine, classified under HTS 2933.99.0500 due to its indole structure. The heterocyclic nitrogen compound takes precedence over amino acid classification.
Duty Rate — Japan → United States
0%
Rate breakdown
9903.03.030%Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
Import Tips
• Indole amino acids classified here, not with other amino acids, per heterocyclic precedence
• Pharma grade requires USP certificate; feed grade may have different documentation
• Avoid Chapter 29 note 3(C) salt classification issues with pure free acid form