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There is a list of ingredients online (link below).
Barley grass and Wheat grass are both very healthy products and not to be confused with the adult grains. As far as I remember they don't contain gluten. In fact they (being superfoods) are 2 of the healthiest things you can eat.
Barley grass is particularly good for detoxing and alkalising the body.
http://www.primal-defense.info/primaldefenseingredients.htm