Black tea is a fully fermented tea, which is a tea refined by a series of technological processes such as withering, kneading (cutting), fermentation and drying using suitable tea plant new tooth leaves as raw materials. Black tea is rich in carotene, vitamin A, calcium, phosphorus, magnesium, potassium, caffeine, isoleucine, leucine, lysine, glutamic acid, alanine, aspartic acid and other nutrients. Black tea can help gastrointestinal digestion, promote appetite, diuretic, eliminate edema, and strengthen heart function. Black tea is "rich in flavonoids that can eliminate free radicals, have an antacidifying effect, and reduce the incidence of myocardial infarction."
