Estrogens
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: > Other: > Other > Estrogens
Duty Rate (from China)
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
Articles provided for in subdivision (b) of U.S. note 52 to this subchapter
Articles of aluminum, of steel or of copper or derivative aluminum or steel articles; passenger vehicles (sedans, sport utility vehicles, crossover utility vehicles, minivans and cargo vans) and light trucks; parts of passenger vehicles (sedans, sport utility vehicles, crossover utility vehicles, minivans and cargo vans) and light trucks; medium- and heavy-duty vehicles; parts of medium- and heavy-duty vehicles; wood products; patented pharmaceutical articles; and semiconductor articles, as provided in subdivision (f) of U.S. note 52 to this subchapter
What changed
Since July 7, 2026, for imports from China
- •Section 232 Pharma — Patented (9903.04.60) now applies: +100%
Products classified under HTS 2937.23.50.10
Estradiol
Estradiol is a naturally occurring estrogen hormone produced by the ovaries, used primarily in hormone replacement therapy for menopausal symptoms. It falls under HTS 2937.23.5010 as a steroidal estrogen used primarily as a hormone. Synthetic versions reproduced by synthesis are also classified here.
Estrone
Estrone is a weak estrogen steroid hormone convertible to estradiol in the body, used in estrogen replacement therapies. Classified under HTS 2937.23.5010 as an estrogen hormone derivative used primarily for hormonal effects. Available in synthetic form for pharmaceutical applications.
Estriol
Estriol is the primary estrogen produced during pregnancy, used in vaginal creams for menopausal atrophy treatment. It qualifies under HTS 2937.23.5010 as a natural estrogen hormone used primarily for hormonal therapy. Synthetic reproductions are included per heading scope.
Ethinyl Estradiol
Ethinyl estradiol is a synthetic estrogen derivative with ethinyl substitution, widely used in oral contraceptives. It falls under HTS 2937.23.5010 as a structural analogue of estrogen used primarily as a hormone. High potency makes it essential for combination birth control pills.
Estradiol Valerate
Estradiol valerate is an ester of estradiol with valeric acid, providing sustained-release estrogen for injection. Classified in HTS 2937.23.5010 per chapter note on esters of hormone acids with later-heading compounds. Used primarily for hormone replacement therapy.
Diethylstilbestrol (DES)
Diethylstilbestrol is a synthetic non-steroidal estrogen historically used in pregnancy support and cancer treatment. Despite non-steroidal structure, classified under HTS 2937.23.5010 as estrogen structural analogue used primarily as hormone per heading scope.
Mestranol
Mestranol is a methoxy derivative of ethinylestradiol used in early oral contraceptives. Falls under HTS 2937.23.5010 as estrogen structural analogue used primarily for hormonal contraception effects.
Quinestrol
Quinestrol is an oral synthetic estrogen ether used in veterinary and human applications. Classified HTS 2937.23.5010 as steroidal estrogen derivative used primarily as hormone.
17α-Ethynylestradiol 3-Methyl Ether
This is a methylated derivative of ethinylestradiol used in pharmaceutical research. HTS 2937.23.5010 covers it as estrogen structural analogue used primarily as hormone.
Estradiol Cypionate
Estradiol cypionate is a long-acting intramuscular estrogen ester for hormone therapy. Classified under HTS 2937.23.5010 following chapter ester rules with parent estrogen.