Sally Hansen nailgrowth miracle, serum is a breakthrough nail treatment designed to support fast natural nail growth, as it perfects cuticles. Grow nails 59% longer. Instantly smooth cuticles. Guaranteed. Sally knows miracles happen. With a little help from science. Concentrated peptide serum formula enriched with biotin enhances natural nail growth without brittleness. Nails become resistant to damage as they grow and cuticles are miraculously softer and smoother.