Hi, I have more than 3 year experience in taking care of cats. Around 5 cats. I have been taking care of them like feeding, grooming, toilet training, walking. We have to provide some supplements like 1)Vitamin A. Vitamin A is an essential nutrient that helps maintain healthy vision, skin, and bones. 2)Amino acids. Amino acids are the building blocks that makeup protein. In addition to health benefits, vitamins boost your cat’s immune system.