Adaptogens are a group of herbal supplements popular in Ayurveda medicine. When supplemented in advance of a stressful event, adaptogens are able to reduce the effects of stress on the body.
Adaptogens do not necessarily share a common mechanism. They may also be classified as a nootropic.
Adaptogens are also supplemented to boost the effects of stimulants. More research is needed to determine the mechanism behind this effect.