I am not a huge fan of smartpaks, they tend to be very expensive. In addition, there is very little scientific research done on what are the therapeutic levels of each thing in the packs. Ie. its not like the package says it has 100mg of glucosamine. Likewise, there is not a lot of research that says what a therapeutic dose is ie. research saying 75mg daily is an effective dose of glucosamine to reduce lameness in 50% of horses. I also don't trust that they don't have an ingredients listed on the package. Which worries me because I like to know what I am feeding other then "performance formula". This was the last time I looked at smartpak stuff which was about a year ago, they might have changed their packaging since then. I know some folks swear by them but its not my cup of tea. If you want to give a joint supplement the one with the best research behind it is cosequin. If are you worried about joint care and supplements I would ask your vet what they think. They know your horse and they know you so they might have some ideas.