Joint suppliment for showjumper (another one sorry!)

[fuzz]

Ok so I’ve just had the vet out for my pony and had a chat about her stiffness. Vet recommends that we put her on a supplement as she’s only stiff when she’s in for a while and it goes away when she’s warmed up well. Vet recommended I put her on cosequin and I've used the dog version on my dog and it worked really well, but it’s quite expensive. So I was just wondering what other supplements people use and if they’ve found them effective or not.

Thanks