The 3 Biggest Problems I See in the Cat Supplement Industry

And what cat owners should know before buying

If I'm being completely honest, I've always been sceptical about supplements.

I'm a cat vet of 25 years. My PhD is in microbiology. I was trained to question bold claims and look for evidence.

At vet school, we were taught that most supplements are unnecessary, and in many cases, that's still true. Not because supplements can't work. But because too often, the formulation doesn't match the marketing.

Here are the three biggest problems I see in the cat supplement industry, and why they matter for your cat.

1. Cat Supplement Formulas Haven't Evolved

We learn more every year about feline inflammation, cartilage degeneration, the gut-brain axis, microbiome diversity in cats and age-related metabolic change. Yet many cat supplements still use blends designed 10 to 15 years ago.

Science evolves. Physiology doesn't stay static. Our understanding improves. But some formulas haven't kept pace with modern feline research.

That's a problem, because cats are not small dogs.

They have unique metabolic pathways, digestive profiles and nutrient requirements. If a supplement hasn't been designed specifically around feline physiology, it may not deliver what it promises.

2. Underdosing in Cat Supplements Is More Common Than You Think

This one is subtle, but important.

Some ingredients genuinely have good research behind them. But the dose matters. In clinical trials, ingredients are studied at specific, effective doses. If a product includes that ingredient, but at a fraction of the studied amount, the expected effect may not occur.

This is where many cat supplements fall short.

Collagen has research behind it, but the type and dose are critical. Probiotics can support gut health, but strain specificity and quantity matter. Fish oil has benefits, but effective daily amounts are often higher than what fits into a single chew or capsule.

An ingredient only works at the dose studied. If the formulation doesn't align with that, the claim becomes marketing, not evidence.

3. "Science-Backed" Cat Supplements Without the Right Context

You'll often see phrases like "clinically proven," "vet formulated," and "backed by research."

But here's what actually matters.

Was the research done in cats? At the same dose? Using the same ingredient form? In combination with the other ingredients included?

One ingredient with isolated data does not automatically validate an entire formulation.

Cats deserve species-specific science. That means ingredients selected based on feline data, doses aligned with what's actually been studied, formulations built around cat physiology, and transparency about who formulated the product.

If you can't find the vet behind a "vet formulated" product, it's reasonable to ask questions.

Are Cat Supplements Worth It?

Sometimes.

Not every cat needs supplementation. Supplements are supportive tools. They are not replacements for veterinary diagnostics, medication or proper diet.

But when formulated correctly, at appropriate doses, using feline-specific data, they can be helpful in supporting digestive health, joint mobility and emotional wellbeing.

The key is appropriate use.

Sudden weight loss, persistent diarrhoea, ongoing vomiting, rapid mobility decline or behavioural changes should always be discussed with your regular vet first. Supplements should complement care, not replace it.

What I Did Differently When Formulating Cat Supplements

When I formulated GUT+, JOINT+ and ANXIETY+, I started from a simple position.

If it doesn't meet a clinical standard, it doesn't go in.

That meant ingredients chosen based on feline research, effective research-aligned dosing, species-appropriate prebiotics and probiotics, undenatured Type II collagen for joint support, amino acid blends selected for feline physiology, Australian manufacturing, and no fillers, colours or cosmetic extras.

And most importantly, transparency.

You know who formulated them. You can see my background. You can see my cat.

If you're considering a supplement for your cat, start with clarity. Not hype.

If you're unsure whether your cat even needs support, or which area is most appropriate, start with one simple question.

Take the quiz and find your starting point.