Rosemary oil can be used to treat acne, arthritis, asthma, back pain, cellulite, colds and flu, constipation, dandruff, depression, diarrhea, fatigue, fluid retention, oily hair and skin, headaches, improve the memory, period pain, headaches, muscle pain, nervous exhaustion, respiratory infections, rheumatism, self-confidence, sinus problems and stiff neck.