Catechins constitute about 25% of the dry weight of fresh tea leaf[1], although total catechin content varies widely depending on clonal variation, growing location, seasonal/ light variation, and altitude. They are present in nearly all teas made from Camellia sinensis, including white tea, green tea, black tea and Oolong tea.
Catechins are also present in the human diet in chocolate[2], fruits, vegetables and wine[3] and are found in many other plant species[4].
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