Rosemary oil treats androgenetic alopecia by preventing a by product of testosterone from attacking your hair follicles. Rosemary oil is utilized as a mild pain reliever. Rosemary also helps repel certain blood-sucking insects that can spread harmful viruses and bacteria. Rosemary oil may naturallyreduce stress. Rosemary oil may help byexpanding your blood circulation. Rosemary oil is commonly used for mental strain and fatigue in folk medicine. Rosemary oil may help reduce tissueinflammationthat can lead to swelling, pain and stiffness. Rosemary oil can be inhaled or applied topically. It’s very concentrated, so you should only use a few drops at a time. The small bottles in which it’s contain plastic droppers that make it easier to dispense single droplets.