A Scents Worth Effects On The Mind - Rosemary activates and enlivens the brain, clearing the head and reducing mental fatigue. May help with memory loss. Effects On The Body - This antiseptic oil is both a physical and mental stimulant, and is excellent in the treatment of muscular strains, arthritis, and migraines as well as skin and hair beauty treatments. Rosemary, in combination with other oils such as Lavender and Marjoram, is very successful in treating athletes with overworked muscles.