All 3 cats took to it within the week. The oldest cat has a noticeable limp in her hind leg due to arthritis. Seems to go up the stairs faster and not using her step stool to get up onto the bed. The size of the container compared to the amount of powder inside was a bit deceiving, could almost have put in a scoop with a longer handle. The cost for 6 containers was $279.30 CA -exchange rate can be brutal.