TO RETAIN, practice. To engage the services of an attorney or counsellor to manage a cause, at which time it is usual to give him a fee, called the retaining fee. The act by which the attorney is authorized to act in the case is called a retainer.
One explanation for the difference in the levels of catechins found in this study and others is the type of samples used. In comparative studies, leaves of Camellia sinensis 4 Discussion Table 1. Levels of catechins and caffeine in tea bags, extract, and ready-to-drink green tea.
How Much Caffeine Is in Tea? True tea is made from the leaves of an Asian evergreen known as Camellia sinensis. White tea, green tea, oolong tea, and black tea all come from this plant, and all contain caffeine. Our herb teas are made from other, unrelated plants and do not have any caffeine. One exception is Yerba MatÃ©, an herb tea that does contain caffeine.