Yes, I've been adding 2-3 gm of Gutwell into my Lab's water bowl. It worked well after my Lab threw up all his breakfast and Lunch on Thursday. Since then he's been doing good. No vomiting. Apart from that. it's not a bad idea to feed a good Liver supplement. I'm using Himalaya's Liver 52, feeding 5ml in the morning. Liver tonics stimulates liver function and improves appetite. You can also use Venky's Ventriliv which is as good as Him's Liv 52.
Vets and pet shops will entice you into buying commercial food, don't fall into their trap.