Elixir of Life
The supposed potion of the alchemists that would prolong life indefinitely. It was imagined sometimes as a dry drug, sometimes as a fluid. Elixir (Arabic, a powder for sprinkling on wounds) also meant among alchemists the philosopher's stone, the tincture for transmuting metals, etc., and the name is now given to any sovereign remedy for disease — especially one of a "quack" character.