Dietary Supplement. Nature s Energy Boost* Full-Spectrum Extract Provides Cardiovascular Protection. Promotes Longevity & Vitality*. 100% Vegetarian. Naturally Gluten Free. Five Thousand Years & Billions of Cups Later Tea has been a medical treasure for at least five thousand years. In 2737 B.C., a Chinese medical text exalted tea as a health tonic, & in 780 A.D. the Chinese tea master Lu Yu explained that tea cured aches, pains, & depression.* In 1211, Eisai Myo-an, the founder of Zen Buddhism, praised tea as an elixir to promote good health and long life.*.