Indole-3-Propionic Acid from China
Indole-3-propionic acid features a three-carbon carboxylic acid chain, under HTS 2933.99.0500 due to indole structure precedence. Used as neurotransmitter precursor and antioxidant.
Duty Rate — China → United States
12.5%
Rate breakdown
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
Import Tips
• Chain length variation doesn't affect indole classification
• Water-soluble; verify dry powder vs solution form on import
• Growing nutraceutical use; pure chemical stays Chapter 29