The health benefits of lemon oil include the alleviation of stress, boosting immunity, regulating sleep, treating asthma, and fighting halitosis. Not only is this oil beneficial for the skin, hair and nails but as well it has soothing effects and anti-fungal properties. Lemons are known to help flush toxins from the body. They can help stimulate lymph drainage, revive energy, and even act as a bug repellent. According to a study published in the International Journal of Food Microbiology, "lemon oil may be the most powerful anti-microbial agent of all the essential oils."