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
Dermalogy Real Ferment Micro EssenceEssence
Neogen
Dermalogy Real Ferment Micro Essence