L-Cystine Free Base

Chemical Formula:

C₆H₁₂N₂O₄S₂

CAS Number:

56-89-3

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L-Cystine Free Base

Chemical Formula:

C₆H₁₂N₂O₄S₂

CAS Number:

56-89-3

L-Cystine Free Base is a sulfur-containing non-essential amino acid formed by the oxidation of two L-cysteine molecules. It plays a critical role in protein structure, hair, skin, and nail health by forming disulfide bonds. This ingredient is used in pharmaceuticals, nutraceuticals, and cosmetic formulations for its antioxidant properties and to support keratin production. Its high-purity form ensures suitability for clinical, dietary, and cosmetic applications.

Characteristics

Molar Weight

240.30 g/mol

Melting Point

≈248–252 °C (decomposes)

Solubility

Slightly soluble in water; soluble in dilute acids

Density

~1.53 g/cm³

Forms

White crystalline powder

Odor

Slight sulfur-like odor

USES AND APPLICATIONS

Key applications

Supports keratin formation for hair and nails.
Acts as an antioxidant in dietary supplements.
Used in pharmaceuticals for protein synthesis support.
Applied in cosmetic formulations for skin and hair health.
Maintains structural integrity of proteins in formulations.

Industries

Pharmaceuticals
Nutraceuticals
Cosmetics & Personal Care
Hair and Skin Care Products
Clinical Nutrition

Synonyms

Cystine, L-Cystine, α,α’-Dithiobis(L-alanine)

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