I personally get no big stomach issues with any orals, no reduced appetite either. I can get acid reflux, especially with dbol it seems.
I know a lot say the reduced appetite is due to liver stress. It could be if you do a lot over a long period of time but many report this effect almost immediately. So I don't really buy it, I suspect some orals have neural effects which reduce appetite. I think Mike Arnold is the only other person, apart from myself who has advanced this theory.
That said, I remember Boston Loyd saying Mike Christian (I think) told him to use Ox Bile extract for stomach issues from orals. Ox Bile contains ursodesoxycholic acid so TUDCA should also help. Has anyone here noticed that TUDCA makes orals more tolerable?