White coated tongue is fungus in gut...which causes leaky gut syndrome. Vitamin C= up to 9 grams a day, divided dose. Start slow or you will spend the day in the bathroom.
Vitamin D will greatly help the liver. Unfortunately, liver tests are always good until you are too far gone for anything to help. Suggest you do Vit D, C, B, Solgar liver cleanse or milk thistle BEFORE yo do a cleanse. Stressing an already sick liver could be very ahrmful.