Hiland's Reclue is good for gastric issues and has been used for ulcers. It is mixed and formulated for Big Sky Minerals in Ohio.
Ingredients: Water, Sodium, Calcium, Magnesium Sulfate, Chloride, Potassium
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Seemed to have helped my horses behavior regarding ulcers. Sadly it was packaged with a few other products and came busted open. Packaging needs to be done separately from other products to prevent damage to the bottle. My horse wouldn't eat it on the grain so I had to give it in a syringe.
Horse with ulcer and attitude figgity, Calmed her dowm and not just ulcer but magnesium is known for calming horses. Also purchase BIG SKY MINERALDS-GOOD STUFF HORSES EAT FREE CHOICE