Estriol (16-alpha-Hydroxyestrone)
Estriol is a natural estrogen produced from animal sources, particularly used in pregnancy-related hormone therapies. It qualifies for HTS 2937.23.10.10 as an animal-derived estrogen used primarily as a hormone. This weak estrogen helps maintain pregnancy and treats vaginal atrophy.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If chemically modified structural analogue
Derivatives not directly from natural materials classify under later general provisions.
If in antisera or blood fractions
Immunological hormone products are excluded from Chapter 29 per chapter notes.
If reclassified as phenolic steroid alcohol
Basic phenolic structure might classify earlier if not primarily hormonal.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Include analytical certificates confirming natural origin and absence of synthetic markers
• Check for anti-dumping duties on specific hormone products from certain countries
• Ensure proper cold chain documentation for temperature-sensitive hormone shipments
Related Products under HTS 2937.23.10.10
Estradiol (17-beta Estradiol)
Estradiol is a primary natural estrogen hormone obtained from animal sources like pregnant mare urine, used primarily in hormone replacement therapy. It falls under HTS 2937.23.10.10 as an estrogen derived directly or indirectly from animal materials. This steroidal hormone regulates reproductive functions and alleviates menopausal symptoms.
Estrone (Theelin)
Estrone is a natural estrogen hormone extracted indirectly from animal urine sources, serving as a key component in estrogen therapies. Classified under HTS 2937.23.10.10 due to its natural animal-derived origin and primary hormonal use. It converts to estradiol in the body for estrogenic effects.
Conjugated Equine Estrogens (Premarin Active)
Conjugated equine estrogens are natural estrogen sulfates extracted from pregnant mare urine, used in menopausal HRT. Falls under HTS 2937.23.10.10 as animal-derived estrogens used primarily as hormones. Contains estrone sulfate, equilin sulfate, and other natural equine estrogens.
Equilin
Equilin is a natural estrogen unique to equine sources, obtained from pregnant mare urine for hormone therapy applications. Classified in HTS 2937.23.10.10 as an animal-derived estrogen hormone. It contributes to the estrogenic activity in conjugated equine estrogen products.