Carla, it’s good that you recognize that you have to be careful with supplements because when it comes to some nutrients, too much can be as harmful as too little. Vitamin A is a good example; it’s important for cats’ health but too much of this nutrient over a period of time can cause a painful bony overgrowth in the joints.
If your cat is eating a good quality balanced diet then there’s no need to add supplements because it contains all the nutrients she needs in the right proportions. At 7 years old, it's time to think about gradually changing her diet to a senior formula.
A homemade diet may need supplementation because not many of them are balanced; one study found that 90% of home cooked diets weren’t nutritionally adequate for adult animals. This is when supplementation may be necessary but it should only be done under the guidance of a veterinary nutritionist such as the team at Balance-IT
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