Equine america cortaflex super so kalm powder the equine america cortaflex super so kalm powder is ideal for horses that experience nervousness and tensions before exercise or competition developed with premium grade magnesium with l tryptophan an essential amino acid that is associated with the production of serotonin that will help to calm and focus the horse super so kalm powder 32 servings for an average horse with magnesium and calcium to be used as part of a balanced d