I have a mare with ringbone and I've had both EquiBone and Medicine Bag recommended to me.  Anyone care to share a review of either (especially if you have a horse with ringbone)?  Looking at the ingredients of the two, they seem to be somewhat similar, but the price is drastically different.

EquiBone - 56 day supply = $275 (approx. $884 for 6 months? ..don't judge if I did the math wrong.. I teach Social Studies, not math lol)

Medicine Bag - 6 month supply = $140

I had a gelding with high ringbone in his right front pastern, and I tried Equibone with him, and saw no difference. I had to put him down in December. 

I had a horse with a bone spur, tried EquBone and saw no difference. 

You might check into OCD pellets