Does a healthy adult cat need a vitamin supplement?
No, not if she is eating a commercial food labeled complete and balanced for her life stage. That label means the food already meets the nutrient profile a cat needs, including the vitamins and minerals a supplement would otherwise provide, and stacking a general multivitamin on top risks pushing certain nutrients (vitamin A and D especially) into an excess range rather than filling a gap that doesn’t exist. Supplements make more sense for a specific, vet-identified need, like a documented deficiency, a therapeutic diet or a particular joint or skin condition, not as a routine addition to an already-complete diet.
