Grown for thousands of years in India and Nepal, Ashwagandha has been called “the king of Ayurvedic herbs”, but it's only been more recently that it's caught the attention of scientists.
A randomized double-blind, placebo-controlled study, considered the "gold standard" of scientific studies, found that a 60 day dosage "safely and effectively improves an individual's resistance towards stress and thereby improves self-assessed quality of life".
Rhodiola is another Ayurverdic herb where numerous trials suggest that it may significantly reduce “burnout”.
Finally, Lemon Balm, has been shown to have a "notable impact on inducing calmness".