Paraxanthine from Japan
Paraxanthine, a caffeine metabolite, features dimethylxanthine structure with nitrogen hetero-atoms in fused rings, aromatic per 2933.99. Falls under U.S. note 3 products. Applied in sports nutrition and metabolic research.
Duty Rate — Japan → United States
6.5%
Rate breakdown
9903.03.030%Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
Import Tips
• Provide stability data showing no degradation products above 0.1%
• Declare CAS number 611-59-6 on commercial invoice for CBP verification
• Avoid retail packaging to prevent reclassification under chapter 33 or 30