Skin Conditioning
HYDROLYZED HAZELNUT PROTEIN
Safety score · 0–100
Good
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
Hazelnut protein broken into peptides — a conditioning ingredient for skin and hair. CIR reviewed it as non-irritating, non-sensitizing at up to 100% in animal models.
Hydrolyzed hazelnut protein is produced by acid or enzymatic hydrolysis of the protein fraction of Corylus avellana. It functions as a skin- and hair-conditioning agent. The 2022 CIR safety assessment of 19 plant-derived proteins and peptides concluded the group is safe as used; neat hydrolyzed hazelnut protein was non-irritating to skin and eyes and non-sensitizing in animal studies up to 100%. Typical cosmetic use is ≤1% in skincare and up to 0.25% in fragrance. No PubChem CID (mixture). Tree-nut allergy is a theoretical concern in leave-on products but the hydrolysis generally eliminates the intact allergenic protein Cor a 9/Cor a 14.
Function
Skin benefits
- Skin and hair conditioning
- Non-irritating in CIR testing
- Film-forming peptides
- Helps hold moisture
Known concerns
- Tree-nut allergy theoretical concern
- Botanical residue quality depends on supplier
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
Related skin conditionings
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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.