Nail Tek Citra 1 Nail StrengthenerCitra Formaldehyde Free helps to develop stronger, flexible nails in a safer, more natural way.Safe and effectiveClinically proven to strengthen nailsNaturally occuring aldehydes derived from citrus sources completely replace formaldehyde.These natural elements provide the strengthening characteristics of aldehydes with the helath and safety of pure citrus.Citra 1: For strong, healthy nailsNail Tek Citra 1 Nail Strengthener