Can a vitamin/mineral supplement contribute to gastric ulcers?

From what I've read, as long as there is plenty of hay available 24/7, it should be alright to feed the concentrated supplement. Studies are still being done. They know that concentrated feeds contribute to ulcers, but it's usually when they are fed in the absence of continual forage. Turnout on gr is best, and less time standing in a stall is very important. Medications are also causative, like bute, for example, when given regularly. If there is already an ulcer present, it may be that the concentrated supplement should be withheld until it is treated and healed, but that would be the vet's call.