dl-Tryptophan from Japan
The synthetic racemic form of the essential amino acid tryptophan, explicitly listed under HTS 2933.99.1200 as an aromatic nitrogen heterocyclic compound. Used in nutritional supplements, animal feed, and pharmaceutical intermediates. Its indole ring structure qualifies it for this specific subcategory.
Duty Rate — Japan → United States
5.8%
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
• FDA prior notice required for food/feed grade tryptophan shipments
• Certificate of Analysis must specify optical rotation confirming dl-form
• Heavy metal and microbial testing documentation prevents FDA holds