An Ex Vivo Comparative Study of the Tensile Strengthening Efficacy of Protein-Derived Actives on Heavily Bleached Hair

This study compared the efficacy of hydrolysed wheat protein, L-arginine, and hydrolysed collagen in strengthening heavily bleached hair. The focus was on improving the wet and dry tensile properties of hair, which are compromised by oxidative bleaching. The study found that these protein-derived actives, when used in conditioning products, could potentially reverse the cortical weakening of hair, although the document did not specify which active was most effective.