Kohnke’s Own Mag-EOrganic Magnesium, Vitamin E and Vitamin B1 Supplement for Horses Mag E is the ideal supplement for working and travelling horses to provide a well absorbed form of magnesium, as well as essential Vitamin E and Vitamin B1, to help nerve and muscle function. Mag E contains: High levels of organic magnesium with the majority provided by organic amino acid (yeast) chelate that reaches the absorption sites as an amino acid shielded complex for optimum