1. Peppermint —great for relieving mental fatigue
2. Rosemary—a highly stimulating oil which can clear the head, aids memory, and a great brain stimulant
3. Eucalyptus—stimulates the mind and aids concentration
4. Basil—is a mental stimulant, which can help aid concentration and sharpen the senses. It can also be very uplifting
5. Geranium—great for relieving stress, nervous tension, anxiety, and depression. It can also balance the hormones if you tend to become fatigued around the same time each month