Viviscal Thickening Shampoo with Biotin and Keratin - 8.45 fl ozAt Viviscal, we understand the science of healthy hair growth form the inside out. Viviscal Thickening Shampoo is formulated with hair building blocks Biotin and Keratin, and fortified with Marine Collagen and Seaweed extract. It gently cleanses while it strengthens and reduces breakage, leading to naturally fuller, thicker, healthier looking hair*. For best results, nourish your hair from within with Viviscal Hair Supplements. Gently cleanses the