None that can be found. I had about $500 worth of testing done (blood work, xrays, etc) and everything came up normal. I was then told he had developed a food allergy and to switch his food. Which I did, numerous times :(
I am about to take him to another vet, it just doesn't make sense...
I am very interested in the B12 option. My cat too has been throwing up randomly, but frequently. I have tried about 10 different specialty foods and it only helps for a short time. In fact, he hardly threw up over the winter which led me to believe he may have allergy drainage causing stomach...