Wilson Collective BE STRONG Strength Building Cleanser strengthens your hair with SI Protein Complex. Cleanse and strengthen your hair with the SI Protein Complex that combines Hydrolyzed Keratin, Corn, Soy, and Silk Proteins with Sacha Inchi Oil, high in antioxidants 3-6 and 9, to improve hair and scalp condition. Build strength while locking in moisture for the strongest, shiniest hair possible.