Multivitamins and fish oil are two different nutritional supplements, and they have some differences in composition and function.

Multi-vitamin is a kind of nutritional supplement made up of a variety of vitamins, including vitamin A, vitamin B, vitamin C and so on. Multi-vitamin can provide comprehensive vitamin supplement, help maintain the physiological function of cats, and enhance immunity and resistance.

Fish oil is a nutritional supplement rich in Omega-3 fatty acids. Omega-3 fatty acids are very important for the health of cat's heart, joints and skin. It also helps to reduce inflammation and promote the normal function of the immune system.