Dipalmitoyl Cystine
molecular structure · PubChem
AKA: 17627-10-0, L-Cystine, N'-Dipalmitoyl-L-cystine
Synthetic
Skin Conditioner
Hair Care
Not Clean
The panel concluded that the 115 amino acid alkyl amides listed below are safe in the present practices of use and concentration in cosmetics, when formulated to be non-irritating...Dipalmitoyl Cystine
Formula
C38H72N2O6S2
Mol. Weight
717.10
CAS #
17627-10-0
Form
Powder
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.
Reduces Static
Conditions Hair
Antioxidant Protection
Locks In Moisture
Wound Healing
Reduces flyaways
Softens and detangles hair
Traditional Use
A synthetic amino acid derivative developed in the late 20th century for use as a skin conditioning and antioxidant agent in cosmetics. It mimics naturally occurring cystine found in keratin but in a stabilized form designed to improve skin barrier function.
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not Phototoxic
medical-approval
all-shades-safe
Concentration Guide
Industry max
Industry typically uses up to 0.05% in leave-on products (18 products reported). Source: CIR Safety Assessment (CIR Seq 607).
Regulatory Agencies
Skin Types
●all-skin-types
Best For
Loss of Elasticity
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewednone on file
⚖️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