Equine America's Glucosamine 10,000 plus MSM contains 10,000 mg 99% pure glucosamine hydrochloride plus 1650 mg of MSM per 30 gram serving. It lasts for 60 days on maintenance and the loading dose is only for a few days. If you have used a joint supplement before then a loading dose isn't necessary. Its £14.99. Its excellent.
For feet I'd say Top Spec AntiLam or Top Spec Comprehensive balancer. I know they aren't a straight hoof supplement but they contain all the right ingredients at the right levels - I can honestly say my lad's feet have improved beyond belief on these products. I've tried a lot of good hoof supplements over the years with very little effect so I didn't hold out a lot of hope for these but I'm now a total convert.
The balancer is meant to include a joint supplement too but since I don't have a problem in that area I can't say how effective it is.
I use Riaflex Complete on my older boy which has kept him in competition. It contains some of the highest levels of compounds on the market. they also do a high spec hoof supplement which I use on my youngster. It is cheaper and comparable in spec to some of the better known ones. All produced by a therapist and loads of info on website. www.riaflex-equine.co.uk. Happy hunting