Liver is a food source rich in vitamin A and other beneficial compounds.

“The other food that's known to be highly enriched in vitamin A is liver, one of my least favorite foods regardless of what animal that liver comes from. Liver is somewhat of a popular/controversial organ meat in the nutrition space for reasons that aren't interesting, for sake of this discussion anyway I suppose for those of you that like liver, you could eat a little bit of liver every once in a while. It is rich in a number of things that are beneficial to health, although for you vegans out there, I'm sure you'll want to avoid liver entirely.”