Selenious acid

Drug ingredient

CAS 7783-00-8

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

US productionNot reported

Import value, 2024$66M

Top sourceChina 46%

This chemical is listed as active in US commerce, but no company reported it to EPA’s survey for 2019 or 2023. Sites may have made or imported less than the threshold amount, or none.

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 281119 · basket

These shares come from HS customs code 281119, which covers 30 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 46%ChinaDE 17%GermanyMY 12%MalaysiaKR 5%South KoreaTW 5%Taiwan

Japan
Netherlands
Switzerland
Norway
Jordan
Italy
Czech Republic
United Kingdom

10 FDA-registered drug labelers

American Regent, Inc.

Azico Biophore India Private Limited

ChemCon GmbH

Hetero Drugs Limited

Interquim, S.A. de C.V.

MACSEN DRUGS

Maithri Drugs Private Limited

Metrochem API Private Limited

Strem Chemicals, Inc.

Topchem Pharmaceuticals Ltd

Why It Matters

Sectors

Health

Downstream Uses

Appears in 3 drug and cosmetic product listings (FDA).

•Multitrace-5
•Multrys
•Tralement

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

Vendor Pricing

$1.13/gA2B Chem LLC

CountryUnited States

Pack$565.00 / 500 g

Purity98%

Vendors4 available

Prices reflect listed pack sizes. Small research packs run far above bulk rates.

3 more vendors

Vendor	Country	$/g	Pack	Purity
Sigma-Aldrich (Rush Stock)	Germany	$1.21	250 g	98%
Sigma-Aldrich	Germany	$1.21	250 g	98%
AA BLOCKS	United States	$1.48	500 g	98%

Chemical Identity

CAS7783-00-8

PubChem CID1091

DTXSIDDTXSID9024300

FormulaH2O3Se

Mol. Weight128.99 g/mol

SMILESO[Se](=O)O

Data Sources

PubChem · compound 1091Retrieved 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

Selenious acid (CAS 7783-00-8) https://chemicalindependence.com/chemical/7783-00-8/ PubChem: 1091. Retrieved 2026-04-07. https://pubchem.ncbi.nlm.nih.gov/compound/1091 EPA TSCA Inventory: CAS 7783-00-8. 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 281119 for CAS 7783-00-8. Reporting year: 2024. https://usatrade.census.gov/