In one study, researchers combined and analyzed the results of 11 studies that examined the effects of rhodiola on physical and mental fatigue in more than 500 people ( 7). It’s widely used as an adaptogen, a natural substance that enhances your body’s ability to cope with stress. Rhodiola rosea is an herb that grows in certain cold, mountainous regions. SummaryĪshwagandha is thought to reduce mental and physical fatigue, thereby increasing energy levels. What’s more, research suggests that ashwagandha supplements are safe and have a low risk of side effects ( 3, 6). In addition to improving mental fatigue and stress, research also suggests ashwagandha can alleviate fatigue associated with exercise.Ī study of elite cyclists found that those who took ashwagandha were able to cycle 7% longer than those given a placebo ( 5).

Strengthening these findings was a review of five studies examining the effects of ashwagandha on anxiety and stress ( 4).Īll of the studies showed that those who took ashwagandha extract scored better on tests measuring stress, anxiety and fatigue. They also had 28% lower levels of cortisol, a hormone that increases in response to stress ( 3). In one study, people given ashwagandha showed significant improvements in several measures of stress and anxiety, compared to those given a placebo. Ashwagandha is one of the most important medicinal herbs in Indian Ayurveda, one of the world’s oldest medicinal systems ( 1).Īshwagandha is thought to increase energy by enhancing your body’s resilience to physical and mental stress ( 2).

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