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
9903.05.860%Universal product exemption (U.S. note 52(b))
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