Cure for Virgil (Rocky Cave) - Fallout 4 Game Guide & Walkthrough | gamepressure.com
TIL you can use the mysterious serum to cure Andre in Far Harbor. : r/fo4
Fallout 4: Virgil's Serum Location
Mysterious Serum Adds Fatigue and Suppresses Immunity: because of COURSE they have to take the best radiation item in the game and make it completely useless. : r/fo4