My 13.5 year old Lab has been on Arthro-IonX to good effect for some months for stiffness and arthritis in his hips and back legs. However, just this week the stiffness has returned slightly. Yesterday I gave him two doses and plan to do that again today. There is already improvement. What is the difference between Promaxol and Arthro-IonX? They seem to have very similar ingredients. Thanks very much in advance.
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