However, it is likely that all-. natural energy drinks may contain as. much caffeine as regular energy drinks, albeit from natural sources. Therefore, natural energy drinks could differentiate. by listing the amount of caffeine on. packaging, if the product has less caffeine.
Description. Oi Ocha is Japan's #1 green tea brand and means Tea, please!. Unsweetened. No calories. With more than 100% RDA of Vitamin C.  1  All natural. 2  Unsweetened.
Oolong is semi-oxidized, so itâs between green and black tea in terms of flavor and caffeine content. Popular oolongs include milk oolong, oolong supreme, tie kwan yin, and ruby oolong. Puâerh is an aged and fermented tea with a slightly âfishyâ smell. Itâs close to black tea in terms of caffeine content.