"Are you completely sure about this?"
The blood of the Gorgons had two properties and it depended on which side of the body the blood came from.
The blood from the right side of one's body contained the power of Life and could heal absolutely any injuries and could even bring the dead back to life as long as the soul had yet to leave the body.
The blood on the left side, on the other hand, contained the power of Death and could bring about a slow and excruciatingly painful death to absolutely anyone and everyone. Even the gods feared the poison of these dangerous beings as it could attack the souls of an entity at a conceptual level. Only hundreds of years of suffering or even temporary death could help them get rid of it and even then it may find some way to latch to some part of the soul and spread again.