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"It is Veritaserum — a Truth Potion so powerful that three drops would have you spilling your innermost secrets for this entire class to hear. Now, the use of this potion is controlled by very strict Ministry guidelines. But unless you watch your step, you might just find that my hand slips — right over your evening pumpkin juice. And then, Potter... then we'll find out whether you've been in my office or not."
Severus Snape explaining the potion's power to Harry Potter[src]

Veritaserum was a powerful truth serum.[1][2] The potion effectively forced the drinker to answer any questions put to them truthfully,[1][2] though there were certain methods of resistance.[6][7] Use of this potion was strictly controlled by the British Ministry of Magic.[1]


During the 1989–1990 school year at Hogwarts School of Witchcraft and Wizardry, Professor Severus Snape was brewing this particular concoction when two of his students, Jacob's sibling and Merula Snyde, came to visit him in the Potions Classroom.[8]

During the 1990–1991 school year at Hogwarts, seventh-year students in Potions class were taught by Professor Snape how to brew this advanced potion.[3] He also taught them how to brew the antidote to Veritaserum that school year as well.[9]

Jacob's sibling observing cup of tea HM732

Jacob's sibling observing a cup of tea spiked with Veritaserum in Umbridge's office

Later during this year, Dolores Umbridge attempted to coerce Jacob's sibling to drink tea spiked with Veritaserum before the trial of Kazuhiro Shiratori in her office, although if they drank it or not is unknown. Their brother Jacob drank her horrible tea and fell under the potion's effects, being unable to tell lies when speaking to their sibling and Corey Hayden in Courtroom Ten. Not wanting him to testify under Veritaserum, Corey distracted and delayed the Wizengamot by saying a Doxy was present in the room, and the three went outside the courtoom so the potion's effects could wear off on Jacob before re-entering the trial.[10]

Veritaserum was used on Barty Crouch Jnr in June of 1995, when Albus Dumbledore discovered that Crouch was disguised as the Defence Against the Dark Arts teacher, Alastor Moody.[2] Severus Snape also threatened Harry Potter with it earlier that year because he suspected that Harry had been stealing supplies from his storeroom necessary to brew the Polyjuice Potion.[1] This was prior to the discovery that Barty Crouch Jnr was in fact the one who had been stealing the ingredients to keep up his disguise as Alastor Moody.[2]

Dolores Umbridge attempted to use Veritaserum on Harry the following year, but to no effect. In actuality, Snape had presented her with a fake potion, and Harry only pretended to drink it, instead dumping it in one of her plants while she was occupied. Umbridge later asked for more Veritaserum after Harry broke into her office to contact Sirius Black, but Snape said it would take a month to make more. Instead, he suggested she use poisons on Harry if the situation were very grave. Snape also taunted her about using the entire bottle during one dosage rather than using the necessary three drops. As a result, Dolores put Snape on probation and tried to use the Cruciatus Curse on Harry. However, Hermione Granger, who was also present, intervened and pretended to tell Umbridge the truth, thus sparing Harry from the curse.[5]

"He indicated the cauldron nearest the Slytherin table. Harry raised himself slightly in his seat and saw what looked like plain water boiling away inside it."
— Harry Potter encounters Veritaserum during a sixth year Potions lesson[src]
Slughorn pottermore

Veritaserum was present during a sixth-year Potions lesson

At the beginning of the 1996–1997 school year, Horace Slughorn, the Potions Master, brewed Veritaserum as an example of the type of potion they should be able to make after completing their N.E.W.T.S.[4] Later, Harry suggested using it on Slughorn to collect a memory. Dumbledore discouraged this idea since he knew that Slughorn would not be fooled easily and could resist the potion with the antidote. Additionally, Dumbledore did not want to use force or coercion on the Potions Master, as betraying his trust in such a way would most likely result in his memory never being collected by Harry.[6]

In 1996, the Rosenfeld case fell apart after the Veritaserum used was accused of being tainted.[11]

In 1997, Rita Skeeter used Veritaserum on Bathilda Bagshot while interviewing her for Albus Dumbledore's biography.[12]


"It's Veritaserum, a colourless, odourless potion that forces the drinker to tell the truth."
— Hermione Granger describing the potion[src]

Veritaserum was clear, colourless, and odourless and was almost indistinguishable from water. According to Severus Snape, the potion had to mature for a full lunar cycle, and was quite difficult to produce;[5] it was something Horace Slughorn expected his students to be able to produce once they finished their N.E.W.T.-level Potions.[4]

It could be mixed with pretty much any drink, and three drops was a sufficient dose to make the drinker "spill out his innermost secrets".[1] Thus, the potion forced the drinker to tell the complete truth to any question put to them, according to what the drinker perceived as true.[2]


Since some wizards and witches could resist its effects while others could not, Veritaserum was "unfair and unreliable to use at a trial", and would have been difficult to use as definitive proof of guilt or innocence.[citation needed]

Another problem was that the victim stated what only they believed to be true, so the victim's sanity and perception of reality were also factors during interrogations. Therefore, while the drinker's answers were sincere, they were not necessarily true. This was the main reason why Barty Crouch Jnr's testimony was only partially credible,[2] as some of his answers were true in his mind, but known to be false by his interrogators.[2] Cornelius Fudge believed that Crouch being a "raving lunatic" was a mitigating factor on the Veritaserum's full effectiveness, thus he chose not to believe half of his testimony.[13] However, despite Crouch's sociopathic and unhinged tendencies, his grip on reality and testimony was just.[14]

Using Veritaserum on a student was strictly forbidden, at least in Hogwarts, a prohibition that Severus Snape considered "regrettable."[15]


Despite being the most powerful truth serum in existence, it could still be resisted through different methods, including the taking of its antidote[6][9] and Occlumency.[7] The potion's effects could also wear off over a short period of time.[10]


The name comes from the Latin words veritas, meaning "truth", and serum, meaning "fluid" or "liquid".

Behind the scenes[]

  • In the film adaptation of Harry Potter and the Goblet of Fire, Snape says that Veritaserum would make even Voldemort spill his darkest secrets. This is most likely an exaggeration meant to intimidate Harry, as Occlumency can be used as a defence against Veritaserum. However, in the book, Snape merely states that it would make Harry spill his innermost secrets, which would almost certainly be true.
  • In Harry Potter and the Goblet of Fire, when Barty Crouch Jnr was being interrogated at the end of the year, Dumbledore shook three drops of Veritaserum into his mouth while he was unconscious. In the film version, Snape poured the entire contents of the bottle right into Barty's mouth while it was forced open in a struggle.
  • In the film adaptation of Harry Potter and the Order of the Phoenix, Dolores Umbridge used the last of the Veritaserum on Cho Chang and made it look like she betrayed Dumbledore's Army by exposing the location of their meeting place, the Room of Requirement. Marietta Edgecombe, who betrayed the D.A. in the novels, was omitted from the film. Cho's unwilling "betrayal" was also the cause of her split with Harry Potter in the film, as Harry was unaware that Cho was under the influence of Veritaserum until revealed by Snape in a conversation with Umbridge. In the novel, it was her continuing grief over Cedric Diggory, irrational jealousy of Hermione Granger, and defence of Marietta's betrayal that caused her split with Harry instead.
  • Because of the potion's usage being heavily controlled by the Ministry, its usages over the series are unauthorised and/or illegal: Dumbledore did not acquire permission from the Ministry before using it on Crouch, Umbridge used it for interrogating students despite such action being forbidden (though being a high-ranking Ministry official herself, she may have had the authority then), and Rita Skeeter used it on Bathilda Bagshot for an interview.
  • Ironically enough, Umbridge's use of what she thought was Veritaserum on Harry wouldn't have worked even if it had been the real potion. Sirius Black was hiding in 12 Grimmauld Place, which was protected by a Fidelius Charm, and Harry wasn't a Secret Keeper at the time and thus was unable to reveal its location. Even if he had been, Veritaserum can't make a Secret Keeper reveal their secret, as they must do so willingly.
  • In the fourth film, Harry Potter: Hogwarts Mystery and Harry Potter: Wizards Unite, Veritaserum is depicted as a dark green liquid, as opposed to a clear one like it is depicted in the books.
  • In Harry Potter: Hogwarts Mystery year 7 chapter 32, Jacob's sibling (the player) has the option to either drink of refuse Umbridge's Veritaserum-spiked tea, but the chapter's story will play out the same anyway in either case, with the only difference being that only Jacob will experience the potion's effects on himself whereas his sibling will be unaffected if the player decides not to drink the tea.

Author's comments[]

J. K. Rowling has said that Veritaserum "works best upon the unsuspecting, the vulnerable and those insufficiently skilled (in one way or another) to protect themselves against it... just like every other kind of magic within the books, Veritaserum is not infallible."[14] For this reason, she explained that even if Sirius Black had been given the opportunity to testify to his innocence under Veritaserum, the Wizengamot likely still would have found him guilty by claiming that Sirius was using trickery to be immune to it.[16]


Notes and references[]

  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Harry Potter and the Goblet of Fire, Chapter 27 (Padfoot Returns)
  2. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Harry Potter and the Goblet of Fire, Chapter 35 (Veritaserum)
  3. 3.0 3.1 3.2 Harry Potter: Hogwarts Mystery, Year 7, Chapter 2 (More Questions Than Answers) - Potions Lesson "Veritaserum"
  4. 4.0 4.1 4.2 4.3 Harry Potter and the Half-Blood Prince, Chapter 9 (The Half-Blood Prince)
  5. 5.0 5.1 5.2 Harry Potter and the Order of the Phoenix, Chapter 32 (Out of the Fire)
  6. 6.0 6.1 6.2 Harry Potter and the Half-Blood Prince, Chapter 17 (A Sluggish Memory)
  7. 7.0 7.1 F.A.Q: Veritaserum at J. K. Rowling's official site (Internet Archive)
  8. Harry Potter: Hogwarts Mystery, Year 6, Chapter 9 (Artefact Check)
  9. 9.0 9.1 Harry Potter: Hogwarts Mystery, Year 7, Chapter 25 (Swan Dive) - Potions Lesson "Antidote to Veritaserum"
  10. 10.0 10.1 Harry Potter: Hogwarts Mystery, Year 7, Chapter 32 (The Wizengamot Trial)
  11. Harry Potter Limited Edition - A Guide to the Graphic Arts Department: Posters, Prints, and Publications from the Harry Potter Films (see this image)
  12. Harry Potter and the Deathly Hallows, Chapter 18 (The Life and Lies of Albus Dumbledore)
  13. Harry Potter and the Goblet of Fire, Chapter 36 (The Parting of the Ways)
  14. 14.0 14.1 F.A.Q.: Veritaserum at J. K. Rowling's official site
  15. Harry Potter and the Goblet of Fire (film) - Chapter 25 (Barty Crouch Jnr)
  16. J. K. Rowling.com
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