"One of my cats became sick and refused to eat. The vet checked the cat and he has kidney problems. The cat refused to eat the K/D cat food, except for kitty treats and sashimi-grade tuna. So, I feed him one of the Pet-Tabs per day to supplement his "recovering" diet. I also feed half-a-tablet to each of the other healthy cats. It is not recommended to feed the supplement vitamins to cats who already receive the minimum dietary requirements from the food (like from Science Diet K/D or I/D), but for a cat who is not eating regularly, these Pet-Tabs supplements are a life-saver!"