The advantage of buying pre-fortified food is that is is already nutritionally balanced for your cat's specific needs. You don't have to worry about giving the right amount of essential elements. If your cat is healthy and has been on a well-balanced diet, there is really no need for additional nutrients.

However, you can also personally vitamin-fortify your cat's food. You will need to consult your veterinarian for your cat's unique supplement requirements. Your vet should give you instructions on what to give, and how best to administer the supplements. Once you receive specific instructions, remember to follow them to the letter because your cat's health will depend on your care in handling the vitamin-fortification process.