Factor Five Lash and Brow Growth Serum

Factor Five Lash & Brow Growth Serum is a prostaglandin-free serum designed to make lashes and brows look fuller and thicker. It uses human stem-cell–derived growth factors, peptides, biotin, and panthenol to help strengthen and condition hair. It’s gentle, cruelty-free, and typically shows results in 4–6 weeks with twice-daily use.