"Liver functioning" refers to how well the liver does its job of processing and filtering out harmful substances from our body, creating essential proteins, and storing energy. Full definition
To the best of my knowledge there are no studies that show that pets with liver disease who are fed these diets live longer or have improved liver function tests. (2ndchance.info)
There was no significant difference in liver function tests between patients on drug and on placebo. (decode.com)
May help to slow the effects aging, reduce toxic burden, boost the immune system, and support liver function. (amazon.com)