Mackenzies Smelling Salts Mackenzies Smelling Salts may be used for the relief of the symptoms of inflamed mucous membranes of the head & throat where thick phlegm is produced (catarrh) & head colds. Ingredients Smelling salts containing the active ingredients per bottle: Ammonia liquor 880/890 8.698g & Eucalyptus oil 0.5g. The other ingredients are glycerol, soft soap, tapioca & water. Directions Inhale vapour through nostrils as required. Do not use in children under 3 months of age.