Sally Hansen nailgrowth miracle, is a professional-strength treatment that promotes speedy nail growth without brittleness, and protects nails against splitting, cracking and tearing. 30% longer nails in 5 days. Guaranteed. Exclusive protein complex prompts fast nail growth. Soy protein binds moisture to nails, strengthening and lengthening without brittleness. Keratin helps protect nails against splitting, cracking and breaking. Collagen and multi-vitamins stimulate healthy nail growth. Nail tip measurement.