Section VI · Organic chemicals

2937.12

Insulin and its salts

How this code is built
29

Chapter

Organic chemicals

37

Heading

The product family within the chapter

12

Subheading

The specific good, identical worldwide

The first six digits are the same in every country that uses the Harmonized System. The United States adds two more for the tariff rate and, often, two more for statistics — which is why the rates below are listed against 8- and 10-digit numbers rather than against this code.

How the schedule reaches this code

  1. 29Organic chemicals
  2. 2937Hormones, prostaglandins, thromboxanes and leukotrienes, natural or reproduced by synthesis; derivatives and structural analogues thereof, including chain modified polypeptides, used primarily as hormones:
  3. Polypeptide hormones, protein hormones and glycoprotein hormones, their derivatives and structural analogues:
  4. Insulin and its salts

Published US duty rates

Duty is set at the 8- or 10-digit line, not at this 6-digit subheading, so more than one rate can sit under this code.

  • 2937.12.00.00Insulin and its saltsg
    General
    Free
    Special (FTA)
    —

    No preferential rate published.

    Column 2
    10%

    Countries without normal trade relations.

This is the listed rate. Antidumping and countervailing duty orders, Chapter 99 actions and preference qualification all change what is actually collected, and classification is a judgement about your goods. Verify with your licensed customs broker before you file.

Other subheadings in heading 2937

Source: U.S. International Trade Commission (USITC) — 2026 HTS Revision 12, released 2026-07-21, published at hts.usitc.gov. A U.S. Government work in the public domain.