L-Tryptophan from China
L-Tryptophan is an essential amino acid with an indole ring containing oxygen-function characteristics, classified under HTS 2922.49.4950. Used in sleep supplements, mood regulation products, and as a precursor for serotonin.
Duty Rate — China → United States
41.7%
Rate breakdown
9903.88.0325%Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
Import Tips
• Provide third-party lab tests for eosinophilia-myalgia syndrome contaminants from historical issues
• Declare tryptophan content >98% with HPLC chromatograms for CBP verification
• Use food-grade packaging to avoid pharmaceutical classification scrutiny