Aging population in Japan and Western Europe are expected to boost a world market for tea polyphenols dominated by functional drinks to $367.7m by 2020 says Grand View Research.

Tea polyphenols are chemical compounds--- antioxidants such as flavonoids and tannins – that occur naturally in tea, and are believed to be beneficial to human health.

Green tea contains between 30-40% of water extractable polyphenols, balck tea (green tea that has been oxidized by fermentation) has 3-10%, Oolong is a semi-fermented and lies between the two.

Polyphenols in tea have been linked with everything from weight loss to Alzheimer's protection and a lower risk of cancers.

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