Sally Hansen Nailgrowth Miracle Serum is a breakthrough nail treatment designed to support fast natural nail growth, while it perfects cuticles. The serum works with concentrated peptide formulas that are enriched with biotin for long-lasting nails. This brittle nail treatment helps make nails resistant to damage as they grow, and miraculously soft and smoother instantly! With this emergency treatment, see up to 59% longer nails in just 2 weeks!* *Based on fixed point nail measurement in 2 weeks.