You have nothing to worry about with only 4 weeks of Anadrol use, especially if you are not partaking in any other liver stressing drugs like acetominophen.
I'd take Tyler's Liver Detox for any and all liver aid properties. It's available at the AF site store.
Before i'd worry about any liver problems, i'd keep a watch on your hematocrit levels. Both Anadrol and Eq can raise them through the roof, together, they can raise it too high fior some. Although, if only on the 'drol for 4 weeks, you shouldn't have any problems.
BMJ