Kathy Love mentions them in her manual, and said nothing about a problem with liver toxitity. They said that the snakes took them readily, but that they were expensive. My friend has some rattlesnakes that aren't eating, and he was force feeding them with the sausages. He said they were easier and cleaner to feed that way, and so far no regurges. I'd be interested to see if there were any studies done. My local petstore still carries them.