Olaplex Browbond Building SerumOlaplex Browbond Building Serum is an innovative clear grooming gel serum that promotes the look of fuller, denser, more defined brows. This 3 in 1 eyebrow treatment not only promotes the appearance of fuller eyebrows but also sculpts without stiffness. Infused with a groundbreaking peptide, it even helps reduce the visibility of new grey hairs, giving you youthful looking brows in as little as 4 weeks.