cysteamine HCL
ethanethiol, 2-amino-, hydrochloride (1:1)
a radiation-protective agent that oxidizes in air to form cystamine. it can be given intravenously or orally to treat radiation sickness. the bitartrate has been used for the oral treatment of nephropathic cystinosis.
  • Charkit Chemical
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      Cysteamine HCl
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      A0296 2-Aminoethanethiol Hydrochloride >95.0%(T)
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2-aminoethanethiol;hydrochloride (Click)
CAS Number: 156-57-0Picture of molecule
Other: 116962-86-8
ECHA EINECS - REACH Pre-Reg: 205-858-1
Beilstein Number: 3590083
MDL: MFCD00012904
Molecular Weight: 113.60976000
Formula: C2 H8 Cl N S
BioActivity Summary: listing
NMR Predictor: Predict (works with chrome or firefox)
Category: cosmetic agents
US / EU / FDA / JECFA / FEMA / FLAVIS / Scholar / Patent Information:
Google Scholar: Search
Google Books: Search
Google Scholar: with word "volatile"Search
Google Scholar: with word "flavor"Search
Google Scholar: with word "odor"Search
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US Patents: Search
EU Patents: Search
Pubchem Patents: Search
PubMed: Search
NCBI: Search
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Physical Properties:
Assay: 95.00 to 100.00 % 
Food Chemicals Codex Listed: No
Boiling Point: 133.60 °C. @ 760.00 mm Hg (est)
Vapor Pressure: 8.390000 mm/Hg @ 25.00 °C. (est)
Flash Point: 94.00 °F. TCC ( 34.60 °C. ) (est)
logP (o/w): 0.028 (est)
Soluble in:
 water, 1e+006 mg/L @ 25 °C (est)
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Organoleptic Properties:
Odor and/or flavor descriptions from others (if found).
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Cosmetic Information:
CosIng: cosmetic data
Cosmetic Uses: antioxidants
hair straightening agents
hair waving agents
reducing agents
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BOC Sciences
For experimental / research use only.
Cysteamine hydrochloride >98%
Odor: characteristic
Use: Cysteamine has been shown to increase intracellular glutathione levels in cystinotic cells, thus restoring the altered redox state of the cells.
Charkit Chemical
EMD Millipore
For experimental / research use only.
Cysteaminium chloride
Cysteamine HCl
Santa Cruz Biotechnology
For experimental / research use only.
Cysteamine, Hydrochloride ≥99%
Sigma-Aldrich: Sigma
For experimental / research use only.
Cysteamine hydrochloride ≥98% (titration)
For experimental / research use only.
2-Aminoethanethiol Hydrochloride >95.0%(T)
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Safety Information:
Preferred SDS: View
Hazards identification
Classification of the substance or mixture
GHS Classification in accordance with 29 CFR 1910 (OSHA HCS)
None found.
GHS Label elements, including precautionary statements
Hazard statement(s)
None found.
Precautionary statement(s)
None found.
Oral/Parenteral Toxicity:
intraperitoneal-mouse LD50  250 mg/kg
Journal of Medicinal Chemistry. Vol. 12, Pg. 510, 1969.

oral-mouse LD50  1352 mg/kg
Chemical and Pharmaceutical Bulletin. Vol. 20, Pg. 721, 1972.

unreported-mouse LD50  244 mg/kg
Pharmazie. Vol. 14, Pg. 132, 1959.

Dermal Toxicity:
subcutaneous-mouse LDLo 900 mg/kg
Acta Biologiae Experimentalis Vol. 12, Pg. 142, 1938.

Inhalation Toxicity:
Not determined
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Safety in Use Information:
Category: cosmetic agents
Recommendation for cysteamine HCL usage levels up to:
 not for fragrance use.
Recommendation for cysteamine HCL flavor usage levels up to:
 not for flavor use.
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Safety References:
EPI System: View search
Daily Med: search
Chemical Carcinogenesis Research Information System: Search
AIDS Citations: Search
Cancer Citations: Search
Toxicology Citations: Search
EPA GENetic TOXicology: Search
Env. Mutagen Info. Center: Search
EPA Substance Registry Services (TSCA): 156-57-0
EPA ACToR: Toxicology Data
EPA Substance Registry Services (SRS): Registry
Laboratory Chemical Safety Summary : 9082
National Institute of Allergy and Infectious Diseases: Data
WGK Germany: 3
Chemidplus: 0000156570
RTECS: KJ0200000 for cas# 156-57-0
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NIST Chemistry WebBook: Search Inchi
Canada Domestic Sub. List: 156-57-0
Pubchem (cid): 9082
Pubchem (sid): 134974440
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Other Information:
(IUPAC): Atomic Weights of the Elements 2009
(IUPAC): Atomic Weights of the Elements 2009 (pdf)
Videos: The Periodic Table of Videos
tgsc: Atomic Weights use for this web site
(IUPAC): Periodic Table of the Elements
HMDB (The Human Metabolome Database): Search
Export Tariff Code: 2930.90.9190
ChemSpider: View
Wikipedia: View
RSC Learn Chemistry: View
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Potential Blenders and core components note
None Found
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Potential Uses:
 reducing agents 
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Occurrence (nature, food, other): note
 not found in nature
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1-amino-2-mercaptoethane hydrochloride
2-aminoethane thiol hydrochloride
1-aminoethane-2-thiol hydrochloride
2-aminoethanethiol hydrochloride
2-aminoethanethiol hydrochloride (1:1)
 cysteamine hydrochloride
 cysteinamine hydrochloride
 ethanethiol, 2-amino-, hydrochloride (1:1)
 MEA hydrochloride
 mercaptamine hydrochloride
2-mercapto ethyl amine hydrochloride
2-mercaptoethanamine hydrochloride
2-mercaptoethylamine hydrochloride
2-mercaptoethylammonium chloride
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PubMed: Anti-inflammatory and carbonic anhydrase restoring actions of yam powder (Dioscorea spp) contribute to the prevention of cysteamine-induced duodenal ulcer in a rat model.
PubMed: Effects of permanent waving on changes of protein and physicomorphological properties in human head hair.
PubMed: Candida albicans aggravates duodenal ulcer perforation induced by administration of cysteamine in rats.
PubMed: Antioxidant treatment inhibited glutamate-evoked NF-kappaB activation in primary astroglial cell cultures.
PubMed: Effect of centrally administered oxytocin on gastric and duodenal ulcers in rats.
PubMed: A method for simultaneous recording and assessment of gut contractions and relaxations in vivo.
PubMed: Isolated rat gastric mucosal cells: optimal conditions for cell harvesting, measures of viability and direct cytoprotection.
PubMed: Effects of sulphur-containing compounds and X-rays on the mouse erythropoietic system assayed by in-vivo peripheral blood micronucleus test.
PubMed: Different molecular forms of basic fibroblast growth factor (bFGF) accelerate duodenal ulcer healing in rats.
PubMed: Induction of micronucleated erythrocytes by MEA, AET, WR-2721 and X-rays.
PubMed: [Effect of newly developed analogue of growth hormone releasing peptide [D-Ala-D-beta Nal-Ala-Trp-D-Phe-Lys-NH2 (KP-102)] on growth hormone secretion in adult male rats].
PubMed: Abnormal glycosylation of duodenal membranous alkaline phosphatase induced by cysteamine in rats.
PubMed: Protein level in testes, kidneys and liver after AET or MEA treatment of mice.
PubMed: Effects of compound U74500A in animal models of gastric and duodenal ulceration.
PubMed: Temporary changes in acid phosphatase activity in the organs of mice treated with AET or MEA prior to 60Co gamma-irradiation.
PubMed: Somatostatin depleting potency of cysteamine-related thiols and amines in the rat: structure-activity relation.
PubMed: Effects of AET and MEA on the lysosomal hydrolase activities in the mouse organs.
PubMed: Selective inhibition of duodenal and jejunal villous cell alkaline phosphatase by the duodenal ulcerogen cysteamine.
PubMed: Temporary changes of protein level in liver after AET or MEA treatment prior to 60Co gamma-irradiation of male mice.
PubMed: Acid phosphatase and arylsulphatase activities in testes after AET or MEA treatment of adult mice.
PubMed: In vivo cell kinetics studies of the duodenum during and after healing of cysteamine-induced duodenal ulcer in rats using bromodeoxyuridine incorporation.
PubMed: Histamine, histamine formation capacity and gastrin in cysteamine-induced peptic ulcer.
PubMed: Augmentation of cysteamine-induced ulceration of rat duodenum by systemically administered gamma-aminobutyric acid (GABA).
PubMed: The role of the sympathetic nervous system in cysteamine-induced gastric lesions in rats.
PubMed: Gizzard ulceration in chicks fed cysteamine alone or in combination with a histamine H2-receptor antagonist.
PubMed: [Small intestinal alkaline phosphatase activity and changes induced by cysteamine administration in fecal excretions of male Wistar rats].
PubMed: Mechanism of action of cysteamine on duodenal alkaline phosphatase.
PubMed: Development and significance of cysteamine and propionitrile models of duodenal ulcer.
PubMed: Prevention of duodenal ulcer formation in the rat by dietary vitamin A supplementation.
PubMed: Involvement of histamine release in the mechanism of cysteamine-induced gastric acid hypersecretion.
PubMed: The role of bile salts in cysteamine-induced duodenal ulcer in the rat and the ulceroprotective property of lysolecithin.
PubMed: Brunner's glands of the rat during cysteamine ulceration.
PubMed: Irradiation of mice pre-treated with radiation protective substances. A pathologic and haematologic investigation.
PubMed: Inhibition by cysteamine-HCl of oncogenesis induced by 7,12-dimethylbenz(alpha)anthracene without affecting toxicity.
PubMed: Radical formation in cysteamine-HCl gamma-irradiated in the dry state and in frozen aqueous solution.
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