Also known as Soy protein hydrolysate, Hydrolyzed Soy Protein (INCI), Amino-acid-rich soy protein
A soy-derived conditioning and water-binding ingredient used in facial and hair care.
Protein-derived humectant & skin conditioner
What it is
Hydrolyzed Soy Protein refers to soy proteins broken into smaller fragments by hydrolysis. Cosmetic ingredient databases list skin conditioning, humectant and hair-conditioning functions. It is not interchangeable with every other soy derivative or soy oil.
Common uses and benefits
In cleansers and other skin-care formulas, hydrolyzed soy protein can contribute to hydration-related and skin-conditioning properties. The feel and effectiveness of any finished product depend on the full formulation and how it is used; a rinse-off cleanser's effects cannot be attributed to one ingredient alone.
Who may like it
People interested in gentle-feeling cleansers and conditioning ingredients may encounter hydrolyzed soy protein. Suitability for sensitive or allergy-prone skin depends on the complete product and an individual's reactions.
Common formats
Hydrolyzed Soy Protein
Facial cleansers
Hydrating moisturizers
Hair conditioners
Pairing and use notes
May be formulated alongside glycerin, aloe vera, cucumber extract and mild cleansing agents. Follow the finished product's directions, especially for rinse-off products.
Good to know
This is a soy-derived material; individuals with known soy sensitivities should inspect the finished product labeling and seek individual advice when appropriate. Any cosmetic can irritate or trigger a reaction. Patch-test if particularly reactive, and stop if persistent irritation develops.
Sources and references
COSMILE Europe — Hydrolyzed Soy Protein — Read reference
