Nail Strangthening Young Living Essential Oils: Poor or weak nails, often containing ridges, indicate a sulfur deficiency. Single Oils: Frankincense, myrrh, and lemon. Oil Blends: Citrus Fresh. Recipe: 2 drops Wheat Germ Oil, 2 drops frankincense, 2 drops myrrh 2 drops lemon. Rub on nails twice per week to strengthen nails.