I can't offer a specific recommendation except to say that the answer I gave the "?thumbs down" to did not address yours. They can eat meat products, but liver can be touchy. A veterinarian who understands the physiology of herps would be a better person to ask. I have raised many water sliders and RES on a diet of canned dog food mixed with bone meal for shell growth. RES can tolerate a lot of vegetables in their diets, but, in some circumstances liver can't always be recommended. Ask your vet.