One of our newest additions to our line, Oi Ocha Dark offers a brew for those who prefer a much bolder tasting green tea than Oi Ocha Original. Plus, it’s even higher in the antioxidant catetchin... it has a minimum of 400mg per bottle of naturally occurring catechin tea antioxidants. Unsweetened. No calories. With 130% RDA of Vitamin C per serving.