Well, I cannot comment with 100% certainty. The only drug I have used that is considered to be even remotely hard on the liver is Winstrol (winny), and I kept that dose at 50mg/ed for no longer than 7-8 weeks.
I cant say that all during the cycle I felt great and had absolutely no problems whatsoever related to any form of liver stress.
Many people will suggest between 500-1500mg of ala per day...it is really up to you.
my last cycle I went with 1500 mg ED of ALA.....I was on some pretty hard stuff.....fro a few weeks I was on 100 drol, 100 Winstrol (winny), and 30 halo.....I'm sure my liver suffered even with that much ALA.....