What drink gave immortality to those who drank it?

The drink that was said to grant immortality to those who consumed it is often referred to as the "Elixir of Life." This mythical substance is most famously associated with the legend of the philosopher's stone in alchemy, which was believed to not only turn base metals into gold but also confer eternal life. Various cultures have legends surrounding similar potions, but they remain purely fictional and symbolic rather than historical or scientific.