Cysteine
Ingredient Info
Cysteine is a sulfur-containing amino acid that helps your skin defend itself against damage and maintain its structure. It works by boosting your skin's natural antioxidant system and supporting collagen production, making it potentially useful for anti-aging, healing, and protecting skin from environmental stress.
Benefits
- Antioxidant protection against environmental damage and aging
- May support collagen health and skin firmness
- Could help with wound healing and skin repair
- Potential benefits for dark spots and uneven skin tone
- Anti-inflammatory properties
Potential concerns
- Limited clinical evidence in topical skincare products—most research is on oral or injectable forms
- Poor skin penetration and stability in formulas, which is why modified versions (like N-acetylcysteine) are often used instead
- Generally well-tolerated, but individual sensitivity possible
Science: Research shows cysteine and its derivative N-acetylcysteine have promising antioxidant, anti-inflammatory, and collagen-supporting properties in dermatology, but most clinical evidence comes from oral, injectable, or systemic use rather than topical skincare products. Chemical modifications improve stability and skin delivery, though higher-quality studies are needed for widespread topical application.
×