Biolage Advanced Keratindose Pro-Keratin Concentrate 3.3oz 10 PTubes by Matrix Contains 10 - 0.33 oz tubes No sulfates and parabens system. Potent professional treatment provides our highest concentration of Pro-Keratin and Silk for Biolage. Over-processed hair is conditioned and has abundant movement. Provides the highest concentration of Pro-Keratin & Silk for Biolage. Gentle system free of sulfates, parabens and harsh salts reinforces protein to depleted areas of over processed hair while locking moisture in to help fight frizz and breakage.