Most healthy cats fed an appropriate complete diet do not need routine vitamin supplements. “Natural” does not mean harmless, and adding nutrients without a reason can upset the balance of the food.
Check what the main food provides
Cats Protection advises choosing a complete food suited to age and health. Read the label: treats, toppers and some tins are complementary rather than complete, so they should not quietly become most of the diet.
Avoid breed-based assumptions
Large cats and Maine Coons still need an individually suitable complete diet, not automatically a multivitamin. Size alone does not identify a deficiency. Coat length, indoor living or a preference for one flavour are not diagnoses either.
Ask before adding anything
Tell your vet the exact product, ingredients and dose you are considering, plus every food and medicine your cat already receives. Human supplements can be inappropriate, and doubling up nutrients across several products is easy.
Keep food records simple
Record the brand, recipe, daily quantity and treats. A dedicated station such as the Kitty Buffet can help keep bowls organised, but nutritional decisions should come from the label and professional advice.
Sources and further reading
Guidance checked 13 September 2026.
