Is it for sure that Cleopatra died from a snake bit?

It has been told that Cleopatra grabbed a snake and let it bite her so that she may die because her lover had killed himself. But this is just a myth. No, Cleopatra did not die by a snake bite. There are several good reasons that she would not use a snake to kill her. The ancient writers say that she died by some type of poison and modern research has come up with the theory that she died of a combination of three poisons which were readily available to her.