We’ve copied below some general information that we obtained from the website for the Tea Council of the UK:
Green and black teas are from the same plant, Camelia sinensis, and contain similar amounts of antioxidants and caffeine. Increasing evidence is highlighting the role antioxidants may have in helping to maintain your health in a variety of ways by opposing the action of free radicals. In addition to the well known antioxidants such as Vitamins C and E, there is growing research demonstrating the potential health maintenance effects of plant-derived antioxidants, polyphenols, found in fruits, vegetables, nuts, cereals and drinks such as tea.
Generally speaking, tea is high in antioxidants and while we do not have an exact level of antioxidants in our teas, here are some web sites that might help you further research the antioxidant levels in tea:
Tea Council of the UK - http://www.tea.co.uk/
Tea Association of the USA - http://www.teausa.com/