By Fabian Barcelo, Founder & Veterinary ScientistVet-reviewed
At Innovet we hear this question a lot: my cat seems healthy and eats well, so do they actually need a supplement? It is a fair question, and the honest answer is that it depends on the cat. Many cats on a complete and balanced diet do well without extras, while others benefit from targeted daily support for their joints, skin, coat or overall wellbeing. The key is understanding what makes cats different and matching any supplement to a real need rather than a marketing promise.
Key takeaways
- Cats are obligate carnivores with needs dogs do not share, so choose pet supplements made or clearly labelled for cats and scale the dose to their smaller size.
- A complete diet covers a healthy cat's core needs, so a supplement is best treated as targeted support for a specific goal rather than a daily must-have.
- If your cat is unwell, off their food, or losing weight, that is a vet visit, not a supplement, because more is not better and some nutrients can harm in excess.
01Cats are not small dogs
It is worth saying clearly, because it shapes everything: cats are obligate carnivores. Their bodies are built to run on animal protein, and they have specific nutritional needs that dogs simply do not share. Cats require certain nutrients in their diet that they cannot make in sufficient amounts themselves, and they are far less equipped to handle a plant-heavy diet than dogs are.
This matters for supplements in two ways. First, a product designed for dogs is not automatically right for cats, so look for treats and supplements made or labelled as suitable for cats. Second, cats are small, so doses and portions need to be scaled down. A cat's whole daily intake is a fraction of a medium dog's, and treats and supplements should respect that.
Cats are not small dogs. They are obligate carnivores with their own needs, and their supplements should respect that.Innovet, on feeding cats well
02When a cat may benefit from a supplement
A complete and balanced cat food is designed to meet a healthy cat's core needs, so a supplement is best thought of as targeted support for a specific goal, not a daily must-have for every cat. Some situations where owners commonly consider one:
Joint and mobility
Particularly for older cats or larger breeds, where stiffness and reduced jumping can creep in with age.
Skin and coat
Where omega-3 fatty acids can help maintain the skin barrier and a glossy coat.
Everyday wellbeing
A daily supplement adds a clearly dosed top-up of supportive nutrients alongside good food.
Life-stage changes
Such as the transition into senior years, when needs shift and a little extra support can help.
In each case, the supplement supports a cat who is fundamentally well. It is nutritional support, not a treatment. If your cat has a diagnosed condition, the right product and dose should be guided by your vet.
03When a supplement is not the answer
Just as important is knowing when to put the jar down and pick up the phone. A supplement is not the right first move if your cat is unwell, losing weight, off their food, drinking or weeing more than usual, vomiting repeatedly, or showing pain or behaviour changes. These need a diagnosis, and reaching for a supplement can delay the care your cat actually needs.
There is such a thing as too much. Some nutrients, including certain vitamins and minerals, can be harmful in excess. More is not better, which is exactly why transparent, sensible dosing matters so much for cats.
04What to look for in a cat supplement
If you do decide a supplement makes sense, a few principles keep you on safe ground.
Choose
- Made for cats, or clearly suitable for them. Check the label rather than assuming a dog product will do.
- Transparent dosing, with key actives listed per serve by weight so you can compare options.
- Quality ingredients held to human-food standards for cleaner nutrition and fewer unknowns.
- A clear purpose, such as joints, skin and coat, or daily wellbeing.
Avoid
- Anything containing onion, garlic or xylitol, which are toxic to cats.
- Human supplements, unless your vet has specifically advised them.
- Vague blends with no amounts, so you cannot tell what your cat is getting.
- Products that promise to fix everything at once.
At Innovet, transparency is the point. We list key actives per serve by weight so there is no guesswork, and we hold ingredients to human-food standards for quality and consistency. That lets you choose for your cat with confidence rather than crossing your fingers.
05How to introduce a supplement
Cats can be famously particular, so go slowly. Introduce anything new in small amounts, watch how your cat responds over a week or two, and keep an eye on appetite, stools and energy. Build any treat or supplement into the daily food budget rather than adding it on top, since cats gain weight easily. And if you are adding a supplement because something seems off, check with your vet first so you are treating the right thing.
Frequently asked questions
Do indoor cats need supplements?
Not automatically. An indoor cat on a complete and balanced diet has its core needs met. A supplement can help for a specific goal, such as joint, skin or coat support, or general daily wellbeing, but it should match a real need. If you are unsure, your vet can help you decide.
Can I give my cat a dog supplement?
It is best not to assume a dog product suits a cat. Cats are obligate carnivores with different needs and smaller body sizes, so choose products made or clearly labelled as suitable for cats, and scale doses to their size. When in doubt, check with your vet.
Are supplements safe for cats?
Quality supplements used as directed are generally safe for healthy cats, but some nutrients can be harmful in excess, so transparent dosing matters. Avoid anything with toxic ingredients such as onion, garlic or xylitol, and do not give human supplements unless your vet advises it.
What is the best supplement for an older cat?
It depends on the individual. Senior cats often benefit from joint and mobility support, and many do well with general daily wellbeing support. The best choice depends on your cat's health, so it is worth a conversation with your vet, especially if there is an existing condition.
My cat seems healthy. Should I still give a daily supplement?
If your cat is well and eating a complete and balanced diet, a supplement is optional rather than essential. Some owners use a clearly dosed daily supplement as everyday support, which is reasonable for a healthy cat. There is no need to add one just in case, and you should never exceed sensible doses.
Clean daily support, scaled for your cat
Health Boost+ is human-grade daily nutrition with key actives listed per serve, so you can support your cat with no guesswork.
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