U spelled radiation wrong dumbo.
Sunlight helps the human body to manufacture vitamin D. In that sense one can say that solar radiation contributes to vitamin D. It does not have vitamin D, though.
Brain
Infrared radiation is invisible to us and emitted by the human body.
It Really Depends Really On What EM Radiation It Is , Visible Light Does Nothing , Radio And Microwave Are Relatively Harmless, Too Much Of The Others Can Damage The Human Body On A Massive Scale. It Will Destroy Human Body Cells
The system in the human body that is affected when on steroids is usually the whole body but mainly the heart
Infrared
skin
eye
liver
Radiation can be very dangerous to the human body and if concentrated enough, can cause death.
The stomach.