The main ingredient of a potent green tea powder is matcha, which is finely ground powdered green tea leaves. Unlike regular steeped green tea, matcha is made from shade-grown tea leaves, which are carefully harvested, steamed, and dried before being stone-ground into a fine powder. This process maximizes its nutrient content and vibrant green color. Matcha is rich in antioxidants, particularly catechins, and contains a form of caffeine that provides a calm alertness due to the presence of L-theanine. It's used in various culinary applications, from traditional tea ceremonies to innovative desserts and beverages.