Rapid Lash & Rapid Brow Duo. Rapid Lash Eyelash Enhancing Serum This formula, enriched with a host of vitamins & proteins, works to strengthen & condition your eyelashes. Clinical trials have shown Rapid Lash Eyelash Enhancing Serum leaves lashes looking 50% longer & 75% fuller than natural lashes over three months. The serum protects against environmental damage & premature breakage or fallout. Rapid Brow Eyebrow Enhancing Serum In just 60 days, this serum formulated with Hexatein 2 Complex can restore sparse, weak or uneven growth in eyebrows. The Hexatein 2 Complex contains a blend of peptides to stimulate growth, proteins to fortify follicles, & ingredients to nourish & soothe the skin.