Keratin Amino Acids, the building blocks derived from hydrolyzed keratin protein, are composed of essential amino acids — particularly high in cysteine — that supply targeted support for skin and hair. In skincare, their small molecular size allows for superior penetration into the stratum corneum, where they enhance hydration, fortify barrier integrity, regulate pH balance, and contribute to natural healing processes by supporting keratin, collagen, and elastin structure.
Within haircare, these amino acids replenish strands compromised by chemical treatments, heat styling, or environmental stressors. They bind within the hair fiber to restore tensile strength, smooth the cuticle layer, minimize breakage, and elevate shine and elasticity, effectively acting as a precision repair and conditioning system.
Quick Insights
Ingredient Rating:
GREAT
Type of Ingredient:
Hydrator, Texture Enhancer, Conditioner, Strengthener, Soother, Barrier Support and Anti-Aging Agent
Intended Function:
Deliver deep hydration and restoration by supplementing structural proteins, thereby fortifying skin and hair integrity and elevating texture and resilience.
Common Applications:
Widely used in serums, moisturizers, repair creams, and hair-strengthening leave-on treatments, particularly in products designed for exposed, heat-damaged, or dry skin and hair.
Target Audience:
Formulators and brand owners focused on restorative, science-backed personal care lines — especially those addressing dry, aged, or structurally compromised skin and hair — seeking ingredients that deliver tangible performance results.
Also Known As:
Hydrolyzed Keratin, Keratin Peptides, Keratin Hydrolysate.
Safety Analysis
High compatibility and low irritation: As a derivative of skin’s native protein, Keratin Amino Acids are generally well-tolerated; they support the skin’s microbiome and aid in wound repair with minimal risk.
Proven efficacy in hair repair: Multiple formulation resources document their ability to bond within hair fibers, fill structural gaps, reduce frizz and breakage, and increase luster and elasticity.
Formulation compatibility: Typically water-soluble and stable when added during the water phase at usage rates between 1–5%, this supports ease of incorporation and broad formulation flexibility.
Source and purity considerations: Most hydrolyzed keratin comes from animal or feather sources; sustainability-conscious brands may seek plant analogues or ensure ethical sourcing and processing when positioning toward natural or vegan segments.
References
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