Mountain tea, also known as Shepherd's Tea, is a plant called Sideritis syriaca that grows near mountain peaks in Greece. It is used to make a warming, stimulating tea that is beneficial for relieving coughs and lung congestion as well as aiding digestion and boosting the immune system. Scientific studies show Mountain tea has anti-inflammatory, antimicrobial, and mild anxiety-relieving properties due to its high antioxidant content.