Clove (Eugenia caryophyllata thumb) Essential Oil. Clove, Inner Warmth Oil, Clove Oil may enhance mental alertness, calmness, decision making, and assist in reducing mental fatigue, emotional weakness, and loss of confidence. Clove has been known to strengthen the immune system. Clove blends well with Rose, Lavender, Clary Sage, Bergamot, Ylang Ylang