OGX Thick & Full + Biotin & Collagen Extra Strength Volumizing Shampoo with Vitamin B7 & Hydrolyzed Wheat Protein for Fine Hair. Sulfate-Free Surfactants for Thicker, Fuller Hair, 13 fl oz. OGX XS Biotin & Collagen Shampoo is a volume-creating powerhouse with an extra helping of vitamins and proteins to pump up flat strands. Extra body doesn't mean extra weight with a thickening, sulfate-free surfactant blend of nourishing ingredients for full, voluminous hair. Biotin, or vitamin B7, is crucial for skin, nail, and hair health. Paired with collagen, this blend helps nourish hair for a full, healthy look. Be ready for a night out with extra strength conditioning designed to fill your strands with life and body. OGX Extra Strength helps provide more volume than regular strength shampoo, so show off those full strands! This premium ingredient blend infused with bamboo fiber extract and hydrolyzed wheat protein creates a color-safe plumping shampoo designed to nourish hair with everything it needs to look healthy and beautiful.