Humectant ingredient

Cysteine

A sulfur-containing amino acid that acts as a humectant and antioxidant in cosmetics, contributing to skin hydration and supporting the skin's own defense mechanisms.

Also known as: l-cysteine

humectantamino-acidantioxidant

Benefits

  • Attracts and retains moisture
  • Supports the skin's natural moisturizing factor (NMF)
  • Antioxidant via thiol group

No known watch-fors.

At a glance
CategoryHumectant
IrritancyLow
Beginner-friendlyYes
Pregnancy safeYes
In your routine

Generally well-tolerated and easy to layer.

Found in 10 products
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Products with Cysteine

Reedle Shot 100Serum
VT Cosmetics
Reedle Shot 100
Cica Daily Soothing MaskMask
VT
Cica Daily Soothing Mask
Aquaporin CreamMoisturizer
Cell Fusion C
Aquaporin Cream
Reedle Shot 300Serum
VT
Reedle Shot 300
Amino Acid Gentle Bubble CleanserCleanser
Dr. Althea
Amino Acid Gentle Bubble Cleanser
Essence
Neogen
Dermalogy Real Ferment Micro Essence