|| For the Mentats that appear in the various Fallout games, see Mentats.
Glamourously Grape Mentats are a chem in Fallout 3.
Notably, Grape Mentats do not increase Intelligence and Perception like their original counterpart. Instead, they only increase Charisma.
An archives prize voucher, found in the National Archives, can be traded for Grape Mentats, Berry Mentats, or Orange Mentats.