dl-Tryptophan from Canada
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 — Canada → United States
15.8%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
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