Something like LivaTone Plus powder would provide you with complete liver health.
It will improve AST, ALT and GGT markers.
Contains Milk Thistle at 35,000mg per 2 level teaspoons + green tea extract, B Vitamins, Zinc, Cysteine, Taurine, Glutamine and Glycine + Vitamine E and Calcium and a few other things a great overall liver product.
If i remember correctly the clinically effective dose of milk thistle to actually improve liver markers is 420mg or about 35g so you need a fairly high dose and this product has that.
What meds are you on exactly?