Insulin Zinc Crystals (Lente Insulin) from Mexico
Amorphous and crystalline zinc-insulin complex providing intermediate duration. HTS 2937.12.00.00 as insulin derivative; zinc modification doesn't trigger Chapter 29 organo-inorganic heading per notes.
Duty Rate — Mexico → United States
0%
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
• Particle size distribution critical for lente formulations; avoid aggregation
• Refrigerated shipping with suspension aids; validate crystal suspension
• Zinc-insulin specificity maintained in 2937.12 despite metal coordination