All of the studies showed that those who took ashwagandha extract performed better on tests measuring stress, anxiety and fatigue.
In addition to improving mental fatigue and stress, research also suggests ashwagandha can alleviate fatigue associated with exercise.
A study of elite cyclists found that those who took ashwagandha were able to cycle seven percent longer than those given a placebo.
Other tips to beat tiredness
According to the NHS, the best way to eat to keep up your energy levels is to follow a healthy, balanced diet.