Dr. Oz green drink

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Ok so I just want to know if I'm doing something wrong.. Today I made Dr. Oz's green drink according to the recipe I found on his website and I think I am doing something terribly wrong- what I made was by no means a "drink". It was far more like green sludge that actually didnt taste bad but I could NOT choke it down because of the thick and gloppy texture. Is it my blender just sucking or is there a magic trick to this that I just don't know about? Anyone out there making this and NOT gagging!?