Green, black, and white tea all come from the same source: the camellia sinensis plant. What differentiates them is how the leaves are processed. White tea, the least processed, is produced from tea leaf buds. Green tea leaves are picked early and preserved through steaming or baking to prevent them from fermenting. Black tea leaves are picked and exposed to air for a certain period of time to ferment. Oolong is partially fermented and black tea is completely fermented. Regardless of how a tea is processed, they all contain antioxidants that help fight free radicals and promote health and well being.
While a cup of black tea contains about half the amount of caffeine found in cup of coffee, it doesn't give you the jitters. Brew for 3 to 5 minutes for maximum flavor. Great hot of cold.