2922.49.49.50/L-Proline/Japan

L-Proline from Japan

L-Proline is a non-essential amino acid with pyrrolidine ring, oxygen-function amino-acid under HTS 2922.49.4950. Key in collagen synthesis supplements and pharmaceutical intermediates.

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%

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Import Tips

• Cyclic structure confirmation prevents acyclic classification

• Heavy metals testing critical for collagen applications

• Fermentation vs synthetic origin declaration