An ex vivo comparison of the tensile strengthening properties of protein derivatives on damaged hair

Conventional conditioning agents, cationic surfactants and polymers, are often limited in their ability to repair and strengthen the hair fibre, while protein-derived actives have been found to enhance the tensile strength of damaged hair. This study investigates the effects of keratin, wheat and collagen hydrolysates on the tensile strength of three types of damaged hair: bleached, permed and thermally treated