Regeneration potion formula is a document in the Blood and Wine expansion. After finding Regis during the main quest La Cage au Fou, this can be found in his lair.

Journal entry

8 measures of vervain extract
leshen fang
broth made of young mandrake shoots
Grind the larger ingredients, add the smaller ones whole. Boil everything in a bronze kettle using crystal water.
Consume the mixture twice daily in half measure doses. Do not exceed the recommended dosage.
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