OGX Thickening Biotin & Collagen Shampoo 385mlOGX Thick & Full + Biotin & Collagen Shampoo 385ml Transform flat, fine, or thinning hair into thicker, fuller looking strands with the OGX Thickening Biotin & Collagen Shampoo. Enriched with biotin (vitamin B7), collagen, and hydrolyzed wheat protein, this volumizing shampoo works from the first wash to plump hair fibres, strengthen strands, and create the appearance of a fuller head of hair. Biotin supports healthy looking hair growth while collagen