Advanced Hair Health Marine Collagen With Seaweed Extract Strand Thickening Anti-Frizz Lightweight Proud Supporter of Arbor Day Foundation Paraben Free SLS Free SLES Free Instant strand-coating lightweight serum for thicker fuller-looking hair. At Viviscal? we understand the science of healthy hair growth from the inside out.Formulated with hair building blocks Biotin and Keratin and fortified with Marine Collagen and Seaweed extract Viviscal Hair Thickening Serum is a lightweight leave-in treatment that coats each hair strand creating multi-dimensional density without frizz leading to thicker fuller-looking hair.