With a pleasant, fresh, herbaceous scent, Basil Essential Oil also improves clear thinking and relieves mental fatigue. More Basil Essential Oil benefits: Skin & Hair: Can be used sparingly for congested skins. Improves hair lustre. Body: Anti-spasmodic, assists digestion, helps treat menstrual problems. Mind & Emotions: Relieves mental fatigue. Improves decision making and clear thinking.