The human body is a conductor. When the human body touches a charged body, there will be voltage at both ends of the human body, which means there will be current in the human body. Whether the current will cause harm to the human body is usually related to factors such as the magnitude of the current and the length of electric shock.
According to relevant research, the maximum safe current of human body should not exceed 10 mA, and safe voltage should not exceed 36 volts. Beyond this range, the product of current and voltage will lead to tissue damage or organ function loss.