Lipoic Acid (Alpha-Lipoic Acid) from Canada
Alpha-lipoic acid contains a five-membered disulfide ring with carboxylic acid, classified under HTS 2930.90.4950 as organo-sulfur acid. Direct C-S bonds qualify; cyclic but not excluded heterocyclic per note 8. Used as antioxidant supplement and diabetes treatment.
Duty Rate — Canada → United States
110%
Rate breakdown
9903.04.6095.8%Except as provided in heading 9903.04.61, patented pharmaceutical articles as provided for in subdivisions (c) and (d) of U.S. note 40 to this subchapter
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• Include R/S racemic mixture specification (rac-alpha-lipoic acid)
• Provide USP assay >98% and heavy metals certification
• Distinguish bulk powder from encapsulated supplement form