Nordihydroguaiaretic Acid (NDGA) from China
NDGA is a potent antioxidant polyphenol from creosote bush used in food preservation and pharmaceuticals. HTS 2907.29.90.00 covers this tetraphenolic lignan as 'other' polyphenol. Synthetic versions also commercially available.
Duty Rate — China → United States
30.5%
Rate breakdown
9903.88.0325%Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
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
• Include prior sanction letters for food additive use
• Specify natural vs synthetic origin
• Document peroxide value for antioxidant efficacy