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

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

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