If you want to cut out caffeine altogether, look for rooibos tea or for herbal or fruit infusions. However, if you just want to cut back, it's worth noting that even black tea (which contains the most caffeine out of all tea varieties) contains less than a third of the amount of caffeine than coffee per serving. Oolong, green tea, and white tea contain even less. Confusingly, decaf tea still contains a small amount of caffeine.