I opted for Cosequin over Seraquin because it looked easier to administer. Shoving a huge tablet down Lolas throat everyday would have knocked her happiness so half a capsule sprinkled in her food is much better.
Cheap glucosamine doesnt work aswell, something to do with if its a sulphate or hydrochloride, the latter is the most effective type.
Cortaflex is the no1, made for humans too
but not sure if cats will like the taste! It has amino acids added to it to make it absorb better.