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The " elixir of life " , also known as " elixir of immortality " and sometimes equated with the name philosopher 's stone , is a potion that supposedly grants the drinker eternal life and / or eternal youth .
 potion, eternal life
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 potion, eternal life