All true tea comes from the leaves Camellia sinensis bush and contain caffeine. How the leaves are processed determine the type of tea it becomes--black, green, white, pu-erh, oolong and even the very rare yellow tea. Black tea goes through a process which starts with drying, called oxidization. Tea leaves intended to be black tea are often macerated during this oxidation process which allows more of the tea leaf to be exposed to air and fully darken. When steeped, black teas are dark and full-bodied with strong, rich flavor.
Black teas, as all true teas, do contain caffeine and the actual amount of caffeine varies from tea to tea.
There are many health benefits to enjoying a good cup of tea regardless of the type of tea, but perhaps the best benefit of all comes to the soul. We embrace William Gladstone's famous poem and give a resounding yes to each line.
"If you are cold, tea will warm you;
if you are too heated, it will cool you;
If you are depressed, it will cheer you;
If you are excited, it will calm you."