Milk Thistle could help your liver...

To stop drinking? No. If there were an effective herb people could take as a supplement, it would be everywhere. Counseling or coaching is your best tool to stop drinking.

Milk thistle has been reported to have healing properties on the liver and has been reported to help eliminate toxins. This could be a nice addition to a well rounded program of recovery including counseling or coaching (read: not in any way a replacement).

Not a herb, but chocolate milk, was identified in the book "Living Sober" as a strategy to combat cravings. Who wants a beer after eating some chocolate ice cream?