Supplementing means giving vitamins and minerals because food alone doesn't have enough. For example, a 35 pound dog would have to eat two pounds of carrots or 43 medium, unpeeled apples a day to get enough riboflavin and niacin.
As Marci was saying, there are some foods you can use so you don't have to use vitamin supplements for everything. Some people prefer to feed carrot or sweet potato for vitamin A (actually beta carotene) instead of supplementing with it because over supplementing can cause big problems.
Are you planning on homecooking long-term or short-term?
Sticking with one protein is good and I would avoid beef, chicken, wheat, corn, flax, egg and soy.
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