What has the most antioxidants in it?

The antioxidant content of tea varies widely from one tea to the next, but it's impossible to generalize about the antioxidant content of broad classes of tea such as green tea, black tea, oolong tea, or white tea. The freshness of tea also affects its antioxidant content, especially after the tea is brewed. Bottled iced tea, or iced tea that has been stored for a while, is low in antioxidants because the antioxidants break down.

Tea contains many different types of antioxidants. Green and white tea tend to contain more of the catechins, whereas oxidized teas including oolong and black tea tend to contain more theaflavins and thearubigins, which are sometimes called tannins, and are the chemicals giving these teas their dark color.

Herbal teas generally do not contain the same antioxidants as in tea, but they are also antioxidant rich.