… but mainly because of the milk you put in it? As the BBC reports:
“A magazine advert for Dilmah tea said that each mug contained ‘a cocktail of vitamins, folic acid and zinc’. It said tea also contained “essential nutrients” such as potassium, riboflavin and vitamin B6. However, many of these nutrients do not come from the tea – but from the milk commonly added to it instead.”
The Tea Council has a site about the health benefits of tea (mainly to do with its anti-oxidant properties, I believe) but it is mainly aimed at health professionals.