Green Tea Green tea is 'unoxidized' tea. The leaves are heated soon after picking in order to destroy the enzymes that cause oxidation. This type of processing preserves a high level of antioxidants, vitamins and minerals accounting for the various health benefits of green tea. The infusion is pale greenish yellow in color and tastes light and grassy. It is best consumed without any additives, although some people may prefer to add lemon or a sweetener but not milk.