well, that might help clear a bit of cloudiness around the subject and maybe define how much a supplement affects the liver, but milk thisle and these compounds aren't exactly drugs
they are more like vitamins.... ALA ive heard is practically just short of an amino acid, and ive read how its such a great addition to almost any routine that involves exercise.... just a great antioxidant
NAC has similiar affects, but targets different areas I'm pretty sure...
And if course milk thisle helps repair liver cells faster.....
These supplements, are supplements of course, but if taken even off something harmful to your liver would still be beneficial.... i look at them as vitamins
If you are doing a cycle, it's always recommended to take it..... maybe 60 dollars for a 8 week cycle for great protection