Question: what ingredients are protein in hair products?
Answer: 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)