It has been discovered that a sizeable portion of the tea's polyphenols (antioxidants) are lost over time. When kept in a regulated atmosphere, tea leaves are reported to stay fresh for roughly a year after the date of manufacturing. With no discernible variation in nutrition and flavour profile, teas are best eaten during this time. Herbal Tea is made from dried herbs (like mint), dried fruits (like apple), dried flowers (like chamomile and jasmine), dried spices (like ginger, clove, cinnamon, cardamom, and nutmeg), dried roots, berries, and seeds are referred to as herbal teas or tisanes. Tisanes may or may not contain tea leaves, but they are so named because they are made in a manner similar to that of regular teas.
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