Disclaimer: Using trainers can disable achievements on some platforms and may corrupt save files. Always back up your "My Documents/My Games/Fallout3/Saves" folder first.
Unlike later Fallout games, radiation in Fallout 3 is a creeping doom. It lowers your maximum HP and, at critical levels, kills you. The trainer’s option locks your rad count to zero, allowing you to swim from the Anchorage Memorial to the Jefferson Pool without blinking. fallout 3 trainer 1.7.0.4
Confirm your game version in the bottom-left corner of the main menu. If it shows 1.7.0.4, use trainers explicitly updated after October 2021. Disclaimer: Using trainers can disable achievements on some
: If the game fails to launch on version 1.7.0.4, try setting both the Fallout Launcher and Fallout3.exe to "High Performance" in your Windows Graphics Settings. Fallout 3 GOTY (How to Fix) 1.7.0.4 It lowers your maximum HP and, at critical levels, kills you