I use Denosyl, so no experience with Ellie. I had thought about switching to Vetri though. I guess I'll hold off on that til you update us on your kiddos.
I think TLC has used both and her furkids did fine, so hopefully she will be alone.
The Vetri DMG is supposed to be the precursor to SAMe (Denosyl), so some replace the Denosyl with it. I have found zero actual research about its effective when doing this...just one paragraph and I think this site was selling it. Ellie's internist had never heard of the Vetri.
The Hepatosupport is supposed to be a great product. Maybe try to give them separately and see? If it happens again or the symptoms get any worse, I probably wouldn't try either again though personally. You can get milk thistle from a vitamin store and give it with vitamin e instead. Lots of vets recommend Marin, but there is a small amount of yeast and liver in it, so it should robably be avoided in severe cases. I don't like the products flavored with meat. I just like the pills that have as few ingredients as possible (aka not so many allergens, etc.). If you don't mind giving products flavored with meat, then Nutramax offers ab chewable version of Denosyl. I think they can eat right after too.
Since your pups are asymptomatic (if I remember right) and you probably don't have to give anything at all, then giving just one of these could be way more than enough. I don't know which one is better for them if just picking one, but I like the idea of SAMe, so that's what I use...