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L-cysteine

Cat.No.S5635

Cysteine is a naturally occurring, sulfur-containing amino acid which is important for protein synthesis, detoxification, and also exerts diverse metabolic functions.
L-cysteine Chemical Structure

Chemical Structure

Molecular Weight: 121.16

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Quality Control

Batch: S563501 Water]24 mg/mL]false]DMSO]Insoluble]false]]]false Purity: 98%
98

Solubility

In vitro
Batch:

Water : 24 mg/mL

DMSO : Insoluble
(Moisture-contaminated DMSO may reduce solubility. Use fresh, anhydrous DMSO.)

Molarity Calculator

Mass Concentration Volume Molecular Weight
Dilution Calculator Molecular Weight Calculator

In vivo
Batch:

In vivo Formulation Calculator (Clear solution)

Step 1: Enter information below (Recommended: An additional animal making an allowance for loss during the experiment)

mg/kg
g
μL

Step 2: Enter the in vivo formulation (This is only the calculator, not formulation. Please contact us first if there is no in vivo formulation at the solubility Section.)

% DMSO
%
% Tween 80
% ddH2O
% DMSO
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Calculation results:

Working concentration: mg/ml;

Method for preparing DMSO master liquid: mg drug pre-dissolved in μL DMSO ( Master liquid concentration mg/mL, Please contact us first if the concentration exceeds the DMSO solubility of the batch of drug. )

Method for preparing in vivo formulation: Take μL DMSO master liquid, next addμL PEG300, mix and clarify, next addμL Tween 80, mix and clarify, next add μL ddH2O, mix and clarify.

Method for preparing in vivo formulation: Take μL DMSO master liquid, next add μL Corn oil, mix and clarify.

Note: 1. Please make sure the liquid is clear before adding the next solvent.
2. Be sure to add the solvent(s) in order. You must ensure that the solution obtained, in the previous addition, is a clear solution before proceeding to add the next solvent. Physical methods such
as vortex, ultrasound or hot water bath can be used to aid dissolving.

Chemical Information, Storage & Stability

Molecular Weight 121.16 Formula

C3H7NO2S

 Storage (From the date of receipt) 3 years -20°C powder
CAS No. 52-90-4 -- Storage of Stock Solutions

Synonyms N/A SMILES C(C(C(=O)O)N)S

Read more about storage stability stock solution CAS number SMILES

Mechanism of Action

Clinical Trial Information

(data from https://clinicaltrials.gov, updated on 2025-08-22)

NCT Number Recruitment Conditions Sponsor/Collaborators Start Date Phases
NCT07136987 NOT_YET_RECRUITING
Tuberculosis
Open Source Pharma Foundation
 2026-01 PHASE3
NCT06260566 NOT_YET_RECRUITING
Biliary Atresia
Sanjiv Harpavat
 2026-10 PHASE1
NCT07543458 NOT_YET_RECRUITING
Dengue; Severe Dengue; Mosquito-Borne Diseases; Vector Borne Diseases; Arbovirus Infections; Flavivirus Infections; RNA Virus Infections; Hemorrhagic Fever
Oxford University Clinical Research Unit, Vietnam
 2026-10-01 PHASE3
NCT07464886 RECRUITING
Mild Depression
University of Cincinnati
 2026-02-26 PHASE3
NCT07323446 NOT_YET_RECRUITING
Emotional Dysregulation
Massachusetts General Hospital
 2027-01-01 EARLY_PHASE1
NCT05537220 ACTIVE_NOT_RECRUITING
Retinitis Pigmentosa
Johns Hopkins University
 2023-10-11 PHASE3

Read more about Clinical Trials

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