Subheading

2937.23

Hormones, prostaglandins, thromboxanes and leukotrienes, natural or reproduced by synthesis; derivatives and structural analogues thereof, including chain modified polypeptides, used primarily as hormones: Steroidal hormones, their derivatives and structural analogues: Estrogens and progestins:

2937 Hormones, prostaglandins, thromboxanes and leukotrienes, natural or reproduced by synthesis; derivatives and structural analogues thereof, including chain modified polypeptides, used primarily as hormones

Duty rates

Column 1, General

Not stated at any level above this line

The rate for goods from countries with normal trade relations.

Column 1, Special

No programme rate on this line

Only if the goods qualify under that programme's rules of origin, which is a determination nobody here can make for you.

Column 2

Not stated at any level above this line

For the small number of countries named in General Note 3(b), which is not held here.

Additional duties

No footnote on this line, or on the lines above it, points at a chapter 99 provision.

These are the published rates for this line. They are not a landed duty. Additional duties under chapter 99, which is where section 232 and section 301 sit, can apply through the U.S. notes to that chapter without a footnote on this line, and those notes are not held here. Classification and country of origin are yours to determine.

Below this

Code	Description	General
2937.23.10	Obtained directly or indirectly from animal or vegetable materials	Free
2937.23.10.10	Estrogens	Free
2937.23.10.20	Progesterone	Free
2937.23.10.50	Other	Free
2937.23.25.00	Estradiol benzoate; and Estradiol cyclopentylpropionate (Estradiol cypionate)	Free
2937.23.50	Other	Free
2937.23.50.10	Estrogens	Free
2937.23.50.20	Progesterone	Free
2937.23.50.50	Other	Free

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2026HTSRev17, retrieved 2026-08-27, from the USITC