My understanding is that 'benzos' and 'pseudobenzos' like Valium and Ambien have relatively little impact on the liver.
It is my understanding too that benzos, like Valium; Ambien (which is actually a hypnotic and in the benzo family); clonazapam; etc. have negligible if any adverse affects on the liver. I've had to take benzos for several years, and I had my first liver biopsy in June. I have 0 fibrosis, and mild inflammation. So, I wouldn't worry unduly about any danger taking Valium to yourliver if you need it for medicinal purposes. The dangerous drug to worry about, of course, is alcohol.