"Well, I think I had better separate the three of you, so you can keep your minds on your potions rather than on your tangled love lives."
-- Snape to Harry, Ron and Hermione as they made Wit-Sharpening Potion (GF27)
Effect is presumably to make a person think more clearly.
Contains scarab beetles, ginger roots, and armadillo bile (GF27)
References from the canon
- The fourth year Potions class was making this shortly after the second task (GF27)
- Much happened in the classroom while Harry tried to prepare this potion. Snape taunted and separated Harry from Hermione because of a Rita Skeeter article about their love lives and alleged triangle with Viktor Krum. Then Snape accused Harry of stealing ingredients from his personal stores, and threatened him with Veritaserum for lying. Eventually Igor Karkaroff entered the classroom and showed Snape the Dark Mark on his arm while Harry eavesdropped (GF27).