zeranol

Drug ingredient

CAS 26538-44-3

This chemical is an active pharmaceutical ingredient used in FDA-regulated drugs.

US productionNot reported

Import value, 2024$286M

Top sourceChina 48%

EPA lists this chemical as inactive, meaning no company reported making, importing or processing it in the US from 2006 to 2016.

Why supply is unknown

Production is reported production, not a complete census of factories. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 293220 · basket

These shares come from HS customs code 293220, which covers 151 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries

Country of origin for US imports, from Census customs data (2024).

CN 48%ChinaIN 15%IndiaJP 7%JapanGB 7%United KingdomCH 7%Switzerland

Mexico
Austria
Indonesia
Czech Republic
Slovakia
Malaysia
Israel
Poland
Vietnam
Ukraine
South Africa
Singapore
Russia
Lithuania
Hungary
Belarus
Brazil
Australia

1 FDA-registered drug labeler

Zhejiang Hisun Pharmaceutical Co., Ltd.

Why It Matters

Sectors

Health

Downstream UsesNot recorded

FDA Shortage Status

Whether any manufacturer currently reports this drug as in shortage on the FDA Drug Shortages database. "Active Shortage" means at least one presentation has status "current."

No FDA shortage records

Chemical Identity

CAS26538-44-3

PubChem CID2999413

DTXSIDDTXSID4022315

FormulaC18H26O5

Mol. Weight322.4 g/mol

SMILESCC1CCCC(CCCCCC2=C(C(=CC(=C2)O)O)C(=O)O1)O

Data Sources

PubChem · compound 2999413Retrieved 2026-04-07
EPA TSCA InventoryRetrieved 2026-04-24
FDA National Drug Code directoryRetrieved 2026-04-07
US Census international tradeReporting year: 2024 · Retrieved 2026-10-04

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Brief citations

zeranol (CAS 26538-44-3) https://chemicalindependence.com/chemical/26538-44-3/ PubChem: 2999413. Retrieved 2026-04-07. https://pubchem.ncbi.nlm.nih.gov/compound/2999413 EPA TSCA Inventory: CAS 26538-44-3. Retrieved 2026-04-24. https://www.epa.gov/tsca-inventory FDA National Drug Code directory: bulk match. Retrieved 2026-04-07. https://open.fda.gov/data/ndc/ US Census international trade: HS 293220 for CAS 26538-44-3. Reporting year: 2024. https://usatrade.census.gov/