Boost hairs fullness and strength with the 1 L Biotin & Collagen Thickening Shampoo. Suitable for all hair types, it is infused with Vitamin B7, keratin protein, and collagen to restore essential nutrients, strengthen the hair shaft, and create the appearance of thicker, healthier hair. Color safe and nourishing, it also makes a thoughtful gift for anyone looking to add volume and vitality to their hair. Contains 1 liter.