It would be current; However, in fact, only both current and voltage up to a certain value can they hurt human beings;

You know,in our daily life, someone gets an electric shock is the result of current instead of voltage. Because as long as current is over withstand current and flows through human bodies that is easy to cause an electric shock. In other words, as current increases, someone is gonna to feel numb and go into convulsions until to death.

PS: High current but low voltage won’t be harmful to human beings; Conversely, so does high voltage but low current.