"Castor oil... At least it doesn't smell as bad as it tastes."
Harry Potter[src]

Castor oil is a vegetable oil extracted from the castor bean.[2]


It is used as a potion ingredient and is sold at the apothecary in Diagon Alley for 4 galleons a bottle.[3] It is also kept in the Hospital Wing. Castor oil is one of the ingredients needed to brew a Love Potion Antidote.[1]

Behind the scenes

  • In the real world, Castor oil has applications in areas such as food preservation and medicine.[2]


Notes and references

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