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Mastication juicers take a little longer to complete than centrifugal juicers, but in the end you will get a healthier juice. These particular juicers are not all built specifically for wheatgrass, so if you want to use wheatgrass a lot of the time, be sure to purchase a wheatgrass juicer. Nevertheless, these juicers will provide you with juice that is much healthier than the kind you can buy at your juicer machine local grocery store. Furthermore, the high speeds at which they operate can cause somewhat of a loss of valuable nutrients and enzymes. They work great with hard fruits and veggies but they have a bit of trouble with wheatgrass and leafy greens. Centrifugal machines are great juicers, but they do possess a few downsides.