what ingredients are protein in hair products?
['Hydrolyzed (wheat, oat, soy) protein.', 'Hydrolyzed Vegetable Protein.', 'Hydrolyzed keratin.', 'Hydrolyzed collagen.', 'Amino acids (Silk, milk, wheat, etc.)', 'Cystine Bis-PG-Propyl Silanetriol (Derivative of keratin protein)']