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[RC] {RC] perform n win and banned substance? - Eleanor Kellon

The prohibited substance reference is because magnesium sulfate can be used intravenously as a sedative. It has largely been replaced by the modern drugs but is still available and often useful for tying up.
The amount in this product is very low compared to the major electrolytes (sodium, potassaium, chloride). Both magnesium and sulfate ions are naturally present in the blood and would not test. Osmotic draw from magnesium sulfate (Epsom salts) isn't a problem in horses. Unlike humans, horses absorb magnesium from this source very efficiently. You would have to give a tremendous amount of magnesium sulfate orally to a horse to have enough left over unabsorbed to cause diarrhea.
Eleanor M. Kellon, V.M.D.
Equine Nutritional Solutions