L-Tryptophan from Japan
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 — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%
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