"the Elixir of life"
by cm

The Alchemist
Public DomainThe Alchemist - Credit: William Fettes Douglas
The Elixir of Life was effectively a liquid version of the Philosopher's Stone.  When drunk, the potion bestowed eternal youth, or cured mortal illnesses.  It restored perfection to any object.  Hermes Trimegistus was said to have drunk it, although it can't have been entirely effective as he ended up mummified in a cave.