What is "vitaminized"

Usage examples of "vitaminized".

But Eustace made faces and spluttered and spat it out and was sick again and began to cry again and asked if they hadn’t any Plumptree’s Vitaminized Nerve Food and could it be made with distilled water and anyway he insisted on being put ashore at the next station.

But Eustace made faces and spluttered and spat it out and was sick again and began to cry again and asked if they hadn't any Plumptree's Vitaminized Nerve Food and could it be made with distilled water and anyway he insisted on being put ashore at the next station.