More research on hydration actually has to be done but – Yes. Other heavily caffeinated coffees and teas and especially sugary juices and sodas are not included here. The European Journal of Clinical Nutrition dispels the common belief that non-caffeinated, green and herbal teas dehydrate. These teas do not dehydrate and also contain potent polyphenols that impact the risk of heart disease and cancers by reducing cell damage. Up to 2 to 3 cups per day of these teas add a net hydration, preventive health benefits and may partially be counted toward your water intake. – But don’t forget your 64 oz./d minimum, H2O intake.