A favorite among tea connoisseurs, matcha is a type of green tea that comes in powdered form. As one of the few teas that contain the entire leaf of the Camellia sinensis plant, matcha is said to boast more antioxidant power than most tea varieties.
While scientists have yet to determine whether matcha delivers more antioxidants than other teas, there's some evidence that matcha may offer certain health benefits. For instance, a preliminary study published in the Journal of Medicinal Food in 2009 found that matcha may help reduce cholesterol levels and keep blood sugar in check.
Although research on matcha's unique health effects is somewhat limited, a great deal of studies suggest that green tea in general may help protect against many health conditions (including high blood pressure, diabetes, and even some forms of cancer). Just don't go overboard--due to the caffeine content, green tea may increase risk of problems like insomnia and headache when consumed in excess (i.e., more than five cups a day)...read the article: Matcha - What You Need to Know.
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The measurement of antioxidants in matcha (and other foods and teas) is pretty well understood by now, through use of something called the ORAC scale. According to this scale, on a per serving basis, matcha has more antioxidants than all the superfoods (wild blueberry, goji berry, pomegrante, acai berry, dark chocolate) *combined*.