There are few beverages in the world as respected as green tea. For generations, all around the world, green tea has been relied on to improve the strength of the immune system and treat a wide range of conditions. This is largely due to the antioxidant compounds, catechins, that are found in such high concentrations within this ancient drink. The anti-inflammatory and anti-carcinogenic compounds help detoxify the body, improve the metabolism, and reduce stress hormone levels in the body, all of which leads to better functioning of the immune system.