Rhodiola rosea has been studied extensively and has been categorized as an adaptogen because of its ability to increase resistance to a variety of chemical, biological and physical stressors. Studies in suggest that Rhodiola has great benefit in conditions where there is a decline in work performance, poor appetite, sleep disturbance, irritability and fatigue. Some studies have found that medical students given Rhodiola during exams report improved concentration and performance, as well as enhanced well-being, improved sleep and greater mood stability. In addition to enhancing mood and improve sleep, Rhodiola can also help decrease episodes of worry and nervousness by supporting the body to function more efficiently under stressful situations.