OGX Thick & Full Biotin & Collagen Shampoo 385ml Turn up the volume with this nutrient rich thickening formula. A fine hair must-have, this powerful blend of Vitamin B7, Biotin, Collagen and Hydrolyzed Wheat Protein, helps plumpen even the skinniest strands to add a wonderful body and shine. Help thicken and texturize any hair type with just one use.