Horse Power Nail Fertilizer contains Horsetail extract, a powerful herb rich in nutrients. The vitamin formulation helps to strengthen and soothe nails, leaving them looking healthy and bright. butter LONDON does not add formaldehyde, toluene, or DBP to any its our nail formulas. It's colour without compromise. Especially Suited For: All skin types Essential Elements: HorsetailFree of: Animal testing Features & Benefits: Strengthens and soothes nails Helps renew nails damaged by professional gels or acrylics Can be used as a basecoat or topcoat or simply a strengthener Gives tired and dull looking nails a refreshed shine Weight: 0.4 oz.