A Truth Serum,[2] also known as a Truth Potion,[1] was a potion that could be used to gain the truth from anyone.[1][3] Jobberknoll feathers were a known ingredient of Truth Serums.[2]

Veritaserum was the most powerful Truth Serum there was. It was a colourless, water-like fluid. Three drops was enough to force the drinker to reveal their deepest secrets.[1][3] As such, the Ministry of Magic restricted its usage.[4] It could be countered with an antidote[5] or Occlumency.[6]

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