Nail Oil Repair & Protect Herbal remedies for nail fungus. The Repair & Protect nail oil is a blend of various plant-based essential oils and is used for the treatment and hygiene of nail fungus. Selected plant extracts effectively inhibit the spread of the nail fungus. An estimated ten million Germans suffer from fungal nail infections (onychomycosis). Those particularly at risk include people over 50, diabetics, those with athletes foot, and people with circulatory problems. Onychomycosis is a persistent condition that requires careful treatment.