Analysis
HTS 2937.12.00 covers insulin and its salts under heading 2937 (hormones, prostaglandins, thromboxanes and leukotrienes, natural or reproduced by…).
There is no general-rate duty on this line, which puts it with roughly 26% of the 1050 tariff lines in chapter 29 that are also free. Free here means free of the base duty only: origin-specific Chapter 99 duties such as Section 301 can still be owed.
Census statistics map these goods to NAICS 325412 (Pharmaceutical Preparation Manufacturing), an industry of 1,436 US establishments employing 170,029 people, the industry a domestic producer of these goods reports under.
Goods from countries without normal trade relations pay the column 2 rate of 10% instead of nothing, so origin decides between free entry and a 10% duty.
All 16 neighbouring lines carry the same duty-free rate, so a borderline choice between them changes the statistics reported, not the duty paid.
Every edition we compared, from Jan 2023 to Oct 2026 (Rev. 22), shows the same general rate of Free.
Neighbouring lines
| Line | Description | General rate |
|---|---|---|
| 2937.11.00 | Somatotropin, its derivatives and structural analogues | Free |
| 2937.19.00 | Polypeptide hormones, protein hormones and glycoprotein hormones, their derivatives and structural analogues: other | Free |
| 2937.21.00 | Cortisone, hydrocortisone, prednisone (dehydrocortisone), and prednisolone (dehydrohydrocortisone) | Free |
| 2937.22.00 | Halogenated derivatives of adrenal cortical hormones | Free |
| 2937.23.10 | Obtained directly or indirectly from animal or vegetable materials | Free |
| 2937.23.25 | Estradiol benzoate; and Estradiol cyclopentylpropionate (Estradiol cypionate) | Free |
| 2937.23.50 | Other: other | Free |
| 2937.29.10 | Desonide; andNandrolone phenproprionate | Free |
| 2937.29.90 | Other: other | Free |
| 2937.50.00 | Prostaglandins, thromboxanes and leukotrienes, their derivatives and structural analogues | Free |
| 2937.90.05 | Catecholamine hormones, their derivatives and structural analogues: epinephrine | Free |
| 2937.90.10 | Epinephrine hydrochloride | Free |
| 2937.90.20 | Other: other | Free |
| 2937.90.40 | l-Thyroxine (Levothyroxine), sodium | Free |
| 2937.90.45 | Amino-acid derivatives: other | Free |
| 2937.90.90 | Other: other | Free |