Add the ingredients to a high-powered blender in the order listed above.
Blend until very smooth — you may need to run the smoothie cycle 2 times — then serve. The Green Smoothie will keep in the refrigerator for up to 3 days if store in an airtight container or jar.
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Notes
This smoothie makes great smoothie packs! Combine the kale, spinach, and mango into baggies then freeze. When you're ready to drink, pour the contents of one baggie into a blender then add juice and blend until smooth.