A Regeneration Potion is used to heal and restore a wizard whose after extreme physical damage, up to and including maiming and disfigurement. It is a work of the darkest magic, requiring the flesh of an ally and the blood of an enemy among its ingredients.
The entire body of the wizard being treated must be immersed in the cauldron in which it is brewed, so only the largest of cauldrons can be used in its creation. For all of these reasons, it is very rarely prepared.
In 1994, this potion was brewed to resurrect Voldemort, using the blood of his enemy, Harry Potter. The use of Potter’s blood would prove an error, as due to other enchantments placed upon it, it prevented Voldemort from killing Potter – but not the reverse.
Related drugs: Sleekeazy’s Hair Potion.