If hairballs try this twice a day. Vets best hairball digestive aid ..I had a cat puking daily and this resolved the issue in about a qeek. . https://www.amazon.com/Vets-Best-Hairball-Digestive-Formulated/dp/B0002I9O84
Also, I have had some success with stomach issue by sprinkling slippery elm on food. About an eighth of a teaspoon. You can find this in health food stores.
If they're anything like these hairball treats, you crush them up so it's more of a powder. My cat begs for them.