Testing designates that exhaling rosemary oil helps prevent the breakdown of dopamine, a brain chemical important for thinking, concentration, and memory. Another research explores that breathing rosemary oils may improve brain function. Inhalation rosemary oil may help you focus and remember information. Rosemary may also aid your memory as you age. It may conflict with certain types of hair loss, including male pattern baldness and patchy hair loss. Prior studies support its pain relief benefits and suggest that it may be more effective than Tylenol. Just smelling rosemary oil may ease your stress levels in situations like exam taking. It may decrease levels of gastrin, a hormone that can have harmful effects on your body. If you feel cold fingers or toes, massaging with rosemary oil may help warm them.