DL-Tryptophan from Mexico
DL-Tryptophan, an indole-containing aromatic amino acid with single oxygen function, is specified in additional U.S. note 3 to section VI, fitting HTS 2922.49.30.00. It is essential for serotonin synthesis in supplements.
Duty Rate — Mexico → United States
6.5%
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
• Include COA confirming no impurities exceeding chapter limits; subject to FDA import alerts for purity
• Pitfall: classifying racemic form as separate from L-form