Quote:
Originally Posted by Cat Person 
In my opinion if you are feeding a commercial diet (Canned/wet, Kibble/dry or a mix of both) you do not need to add any vitamins to the animals food.
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Ditto, and be careful about fat-soluble vitamins. You can give 100,000% of required Vitamin C amount everyday for example, and the cat will just have some very expensive urine. Fat-soluble vitamins though are not always required and are stored in the body for long periods. If these are already in more than sufficient amounts in the food, and the supplement has a high dosage to boot, then over enough time it can become toxic and do more harm than good causing nausea, kidney, and liver damage.