The medical uses of zinc have been known for a hundred years or more. Zinc and Vitamin C lozenges were sold for colds about 40 years ago. Ayrton's Zinc and Su

The medical uses of zinc have been known for a hundred years or more. Zinc and Vitamin C lozenges were sold for colds about 40 years ago. Ayrton's Zinc and Sulphur tablets were sold for teenager acne 60-80 years ago. The addition of zinc to TPN (Total Parenteral Nutrition - Intravenous Feeding) formulations was widely used 35 years ago.