We started giving him cat lax. Then heard about Egg lecithin. I was giving him 1/2 capsule a day. Some weeks are better then others. But he was still throwing up hairballs. I tried giving he it twice a day or once a day and twice every other day. If im not mistaken he throws up more when I give him more and no hairballs. I even gave home cat lax and egg lecithin. He hates to be brushed. What else works for your cat and hairballs? Ive read more fiber in their diet and canned food?