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cysteine

Drug ingredient

CAS 52-90-4

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

Molecular structure of 52-90-4
US productionNot reported
Import value, 2024$760M
Top sourceChina 33%

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 293090 · basket

These shares come from HS customs code 293090, which covers 418 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
CN 33%ChinaES 14%SpainCH 9%SwitzerlandIT 7%ItalyIN 7%India
16 FDA-registered drug labelers
Ajinomoto Health & Nutrition North America Inc.
BioActive Nutritional, Inc.
BioActive Nutritionals, Inc.
Deseret Biologicals, Inc
DNA Labs, Inc.
Dr. Donna Restivo DC
Energetix Corporation
Energique, Inc.
Guna spa
H2 Nutrition
Healthy Habits Management Company Inc.
InLight Creation, LLC.
Liddell Laboratories, Inc.
Nutritional Specialties, Inc.
Professional Complementary Health Formulas
Temple Health Nutrition, LLC

Why It Matters

Sectors
Health
Downstream Uses

Appears in 28 drug and cosmetic product listings (FDA).

  • •Transform 30
  • •Bio Co-Enzyme Phase
  • •Mitochondria PRO
  • •Diathesis V 1
  • •Metox
  • •Diathesis IV
  • •Metal-Chord
  • •TH-101
Show all 28
  • •Metab
  • •Metabatone
  • •Metals
  • •Vital Skin Hair Nails
  • •Omeosport
  • •Diathesis II
  • •Oligo Bio Iodine
  • •N-24
  • •L-Cysteine 7403
  • •Thio Combination 9306
  • •Hepatic-Tone
  • •Ultra Slim 30
  • •Diathesis I
  • •Diathesis V 2
  • •E.O.L.
  • •Free Radical
  • •Diathesis III
  • •MetDetox
  • •Metabolism
  • •Hepaticol Drops 5008
FDA Shortage Status
No FDA shortage records

Vendor Pricing

$0.24/gApexbio Technology LLC
CountryUnited States
Pack$61.00 / 250 g
Purity98%
Vendors29 available

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

28 more vendors
VendorCountry$/gPackPurity
Combi-Blocks, Inc.United States$0.51500 g95%
A2B Chem LLCUnited States$0.5625 g97%
ChemsceneUnited States$0.61500 g—
BLD Pharmatech Co., LimitedUnited States$0.61500 g95%
BLD Pharmatech GmbHGermany$0.61500 g95%
BLD Pharmatech Ltd.China$0.61500 g95%
Ambeed, Inc.United States$0.61500 g95%
Aaron Chemicals LLCHong Kong$0.63500 g95%
AA BLOCKSUnited States$0.66100 g95%
Angene ChemicalChina → Hong Kong$0.67500 g97%
Fluorochem EUGermany$1.0225 g95%
Fluorochem UKUnited Kingdom$1.0325 g95%
MedChemExpress MCESweden$1.04500 g98%
Acrotein ChemBio, Inc.United States$1.09250 g—
Manchester OrganicsUnited Kingdom$1.52100 g97%
AK Scientific SpecializedUnited States$1.6425 g95%
Angene International LimitedUnited States$1.9625 g95%
AK Scientific, Inc.United States$2.7625 g98%
AstaTech, IncUnited States$3.1625 g95%
Sigma-Aldrich (Rush Stock)Germany$5.7650 g—
Sigma-AldrichGermany$5.7650 g—
MedKoo Biosciences, IncUnited States$18.0025 g98%
Cayman EuropeEstonia$31.655 g95%
MolnovaChina$43.001 g99%
Otava, Ltd.Ukraine$2280.0050 mg95%
Otava, Ltd. (2 weeks)Ukraine$2724.0050 mg90%
AngeneChina → Hong Kong$4266.6730 mg97%
TimTec, LLC (back-ordered)United States$32000.0015 mg94%

Chemical Identity

CAS52-90-4
PubChem CID5862
DTXSIDDTXSID8022876
FormulaC3H7NO2S
Mol. Weight121.16 g/mol
SMILESC(C(C(=O)O)N)S

Data Sources

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Brief citations

cysteine (CAS 52-90-4) https://chemicalindependence.com/chemical/52-90-4/ PubChem: 5862. Retrieved 2026-04-07. https://pubchem.ncbi.nlm.nih.gov/compound/5862 EPA TSCA Inventory: CAS 52-90-4. 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 293090 for CAS 52-90-4. Reporting year: 2024. https://usatrade.census.gov/