I am going to start my mare on joint supplement to keep her comfortable this competition season. I went to Tractor Supply and found a ton of different joint supplements. The prices varied staggeringly -- from $20 to more than $50.
I read the labels and found they all contained the same amount of glucosamine (5000 per once). The levels of MSM varied slightly. Additional ingredients varied a lot; some supplements had herbal additives, or shark cartilage, or things like that.
Am I paying for additives and MSM? Is price really a reflection of effectiveness? What would you suggest I buy?