murphyCystine
AKA: L-cystine, L-Dicysteine, Beta, Beta'-Dithiodialanine, L-Cysteine disulfide, 1-Cystine
Synthetic
Skin Conditioner
Hair Care
Not Clean
OriginCystine is synthesized from the amino acid cysteine, which belongs to the sulfur-containing amino acid chemical family. It is produced through oxidative dimerization of two cysteine molecules, linking them via a disulfide bond.
Cystine
Formula
C6H12N2O4S2
Mol. Weight
240.3
CAS #
56-89-3
Form
Powder
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
Functions
Antistatic
Hair Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Anti-Inflammatory
Moisturizing
Brightening
Reduces flyaways
Softens and detangles hair
Provides scent
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed1 review →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR