Butter London doesn't add Formaldehyde, Formadine Resin, DBP, Toluene, Camphor, Xylene, or TPHP to any of its nail product formulas. Use horse power Nail Rescue Basecoat with our 8-free mani See below for our quick and easy guide to polish perfection! Infused with Horsetail Extract, Biotin, and Vitamin B to help rescue damaged nails and protect against future damage. Horsetail extract & Biotin strengthen and fortify weak nails. Vitamin B / Calcium minerals promote stronger nails. Prevent nail breakage. UV Shields preserve radiant color. Prevent chipping and smudging.