Zest Tea Adds Two More Zero-Calorie Sparkling Teas Flavors 0 Shares Zest Tea — the most caffeinated tea on the market — is excited to introduce two new sparkling flavors: Blood Orange Mango and Cucumber Melon. These delicious zero-calorie options join Zest’s all-star sparkling tea lineup of Passionfruit Berry, Sweet Chai Infusion, Pomegranate Mint, and Blackberry Lime. All six sparkling teas come in 12oz sleek cans containing Zest’s signature combination of 120-150mg caffeine, paired with 100mg L-Theanine (a rare amino acid) for prolonged, steady alertness. Made entirely with natural ingredients, these teas have all the positive, plant-based health benefits with low to no sugar.