According to the Journal of Food Science, the antioxidants in green tea decrease an average of 35% after 6 months on the shelf. These antioxidants, known as catechins, may decrease your risk of several types of cancer, but are sensitive to both light and oxygen.
Suggestion: Buy your tea in airtight cans rather than packages wrapped in cellophane, which air can penetrate. Green tea is more sensitive to heat than is black tea. Store your tins of green tea in the refrigerator. Buy quality teas and store properly to get the ultimate protection.
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