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I've been using this product for the past week and a half to coincide with my return to doing cardio. After two shots, I am ready to declare this product a success; my knees would normally be sore as hell from going like mad on the Precor with high resistance EOD. Right now, they feel great...even the one I had the operation on. I also notice that my wrists and elbows feel better than they have since high school. Sodium Hyaluronate works by causing the joints to be more lubricated. Anyone else who has tried it, please post up.