Cat Treats Ingredients to Avoid in 2026: The 12 Worst Ingredients in Cat Treats That Could Harm Your Cat

Not all cat treats are created equal. Some are clean, single-ingredient protein. Others are chemistry experiments with 30+ ingredients, half of which you can’t pronounce.

We analysed over 50 cat treat ingredient labels and cross-referenced them with veterinary safety databases, EU banned-additive lists, and FDA GRAS (Generally Recognised as Safe) classifications. Here are the 12 most common red flags we found, and what to choose instead.

For human foods cats should and shouldn’t eat, see our “can cats eat” guides: cheese, eggs, milk, chicken, salmon, tuna, rice, ham, bread, potatoes, and dog treats. Dairy, eggs, meat, fish, and cross-species foods are the most common non-treat things owners try to feed cats.

The 12 Ingredients to Avoid (At a Glance)

1. BHA & BHT: Synthetic Preservatives That Shouldn’t Be in Food

What They Are

BHA (butylated hydroxyanisole) and BHT (butylated hydroxytoluene) are synthetic antioxidants added to prevent fats from going rancid. They’re petroleum-derived and laboratory-synthesised, and BHA is classified by the US National Toxicology Program as “reasonably anticipated to be a human carcinogen.”

Why They’re in Cat Treats

Cat treats contain animal fats (chicken fat, fish oil). Fats oxidise when exposed to air: they go rancid, smell bad, and lose nutritional value. BHA/BHT slow that process, extending shelf life from 6 months to 18 months. For manufacturers, this is a cost decision: without synthetic preservatives, they’d need more expensive natural alternatives or faster inventory turn.

The Risk

• Carcinogenicity: The IARC (International Agency for Research on Cancer) lists BHA as a Group 2B carcinogen: “possibly carcinogenic to humans.” Long-term rodent studies show forestomach tumours at high doses. Cat-specific data is thinner, but cats are smaller mammals with faster metabolisms. The extrapolation is concerning.
• EU Ban: BHA and BHT are restricted in human food in the EU. They’re allowed in pet food, but the EU is reviewing this. The precautionary principle suggests avoiding them.
• No Nutritional Benefit: These are not nutrients. They don’t improve the treat. They’re purely industrial chemicals added for manufacturer convenience.

Where You Find Them

• Friskies Party Mix (contains BHA and BHT in some flavours)
• Most budget crunchy treats under $5/100g
• Any treat with “preserved with BHA/BHT” on the label

Safer Alternatives

Natural preservatives: Mixed tocopherols (vitamin E), rosemary extract, ascorbic acid (vitamin C). These work the same way (antioxidant action) but are food-grade plant extracts, not synthetic chemicals. The trade-off: slightly shorter shelf life (12 months vs 18 months), but that’s a feature, not a bug. Fresher treats are better treats.

No preservative: Freeze-dried treats (PureBites, Vital Essentials, Orijen) don’t need preservatives because the water is removed. No water = no oxidation = no rancidity. The treat stays “fresh” indefinitely in a sealed bag.

Label-reading cheat: If the ingredients list includes “mixed tocopherols,” “rosemary extract,” or “ascorbic acid,” those are natural preservatives. If it says “BHA,” “BHT,” or “ethoxyquin,” put it back.

2. Ethoxyquin: The Fish-Meal Preservative With a Dark History

What It Is

Ethoxyquin (EQ) is a synthetic antioxidant originally developed by Monsanto in the 1950s. It’s used almost exclusively in fish meal: the ground-up fish parts used in fish-flavoured cat treats and food. It prevents the omega-3 fatty acids in fish from oxidising, which would otherwise turn fish meal into rancid, smelly, nutritionally worthless powder.

Why It’s in Cat Treats

Fish-based treats (tuna, salmon, whitefish) need a preservative for the fish meal ingredient. Ethoxyquin is the cheapest and most effective. It’s allowed in pet food by the FDA at 0.0075% (75 ppm). The EU suspended its authorisation as a feed additive, pet food included, in 2017. The conflict: it’s legal in the US, but the EU’s suspension signals regulatory discomfort.

The Risk

• Monsanto connection: Ethoxyquin was Monsanto’s product. Monsanto’s legacy includes PCBs, Agent Orange, and glyphosate, a history that doesn’t inspire trust.
• Liver/Kidney toxicity: A 1997 study in dogs showed dose-dependent liver enzyme elevation and kidney tubule damage at ethoxyquin levels above 0.01%, about a third higher than the FDA limit. Cats are not dogs, and cats are, if anything, worse than dogs at clearing many compounds through the liver.
• Unknown cumulative effect: Ethoxyquin accumulates in adipose tissue. No long-term study has been done in cats. For a pet that lives 15-20 years, the cumulative burden is unknown.

Where You Find It

• Fish-based crunchy treats: anything with “salmon meal,” “tuna meal,” or “whitefish meal” in the ingredients
• Some cat foods with fish meal (not just treats; check your cat’s kibble for ethoxyquin)
• Brands that don’t disclose: Some manufacturers don’t list ethoxyquin on the label because it’s a processing aid, not an ingredient. It can be hidden. If the label says “fish meal” and doesn’t specify a preservative, ethoxyquin is likely present.

Safer Alternatives

• Whole fish treats: Dried bonito flakes (Cat-Man-Doo) and freeze-dried whole minnows (PureBites) don’t need preservatives. Removing the water preserves the fish without chemicals.
• Broth-based fish treats: Tiki Cat Stix uses tuna broth, not tuna meal: no fish meal, no ethoxyquin needed.
• Transparency: Choose brands that explicitly state “no ethoxyquin” or “preserved with mixed tocopherols.”

3. Propylene Glycol: The Antifreeze Ingredient

What It Is

Propylene glycol (PG) is a clear, odourless liquid used as a humectant: it keeps things moist. It’s also used in automotive antifreeze (the non-toxic “RV/marine” antifreeze, not the toxic ethylene glycol version). In human products, it’s in cosmetics, toothpaste, and e-cigarette liquid. In pet food, it keeps semi-moist treats soft and chewy.

Why It’s in Cat Treats

Semi-moist treats (pill pockets, some soft chews, some “moist meat” treats) rely on a humectant like PG to stay squishy. Without it, they’d dry out and harden in the package. PG is cheap and effective, and it’s still used in dog treats, but the FDA has prohibited it in cat food, treats included, since 1996.

The Risk

• Metabolic burden: Propylene glycol is metabolised by the liver and excreted by the kidneys. In healthy cats, this is fine: it’s a minor metabolic load. In cats with kidney disease (CKD, which affects 30% of cats over 10) or liver disease, any additional metabolic processing burden is best avoided. Vets recommend avoiding PG-containing treats for these cats.
• Haemolytic anaemia in cats: Unlike dogs, cats have a unique red blood cell sensitivity. In a 1974 study, cats fed high doses of PG (5-10% of diet) developed haemosiderin deposits in their spleens and livers: signs of subclinical red blood cell damage. This cat-specific sensitivity is why PG is prohibited in cat food in the US.
• EU restriction: The EU restricts PG in cat food (not dog food) due to the species-specific sensitivity. US regulations differentiate too: the FDA prohibits it in cat food but allows it in dog food.

Where You Find It

• Semi-moist treats: “moist meat” sticks, pill pockets, soft chews (mainly dog versions or imported cat treats, since it’s prohibited in US cat food)
• Some “gourmet” soft treats that stay squishy in the bag
• Not in hard/crunchy treats (they don’t need a humectant)
• Not in freeze-dried treats (water is removed, not added)

Safer Alternatives

• Hard/crunchy treats: No humectant needed. Temptations, Greenies, and most crunchy treats are PG-free.
• Freeze-dried treats: PureBites, Vital Essentials (no moisture, no PG).
• Lickable treats without PG: Tiki Cat Stix uses broth as the moisture base, not PG. Churu uses water + tapioca, no PG.

4. Artificial Colours: Not for Cats, for You

What They Are

Red 40 (Allura Red AC), Yellow 5 (Tartrazine), Yellow 6 (Sunset Yellow), Blue 2 (Indigotine): synthetic dyes derived from petroleum. They’re added to cat treats to make them look appetising to humans, not cats.

Why They’re in Cat Treats

Cats don’t care about colour. They hunt by smell and movement: a grey mouse looks the same as a brown one to a cat. But humans do care. We buy with our eyes. A bag of pale, beige treats looks “cheap.” A bag of vibrant red, green, and yellow treats looks “premium.” The colours are a marketing tool aimed at the human buyer.

The Risk

• No nutritional value: These dyes add zero nutritional benefit. They’re pure aesthetics.
• Behavioural effects: A 2007 Southampton study linked synthetic food dyes to hyperactivity in children. Cats aren’t children, but the neurochemical pathways (dopamine, serotonin) are conserved across mammals. If it affects attention in human children, it’s plausible it affects behaviour in cats, though no cat-specific study exists.
• Tumour risk (animal studies): Red 40 at high doses accelerated tumour growth in mice. Yellow 5 caused testicular changes in rats. The doses in cat treats are far lower, but cumulative exposure over 15-20 years is unknown.
• EU ban: None are banned in pet food, but the EU requires warning labels on human foods containing these dyes (“may have an adverse effect on activity and attention in children”).

Where You Find Them

• Temptations: Red 40 in some flavours, such as Savory Salmon (the Tasty Chicken recipe has no added colour)
• Friskies Party Mix: multi-coloured shapes
• Budget “cat crackers”: the rainbow-coloured bags at supermarket
• Any treat with “colour added” or “artificial colour” on the label

Safer Alternatives

• Naturally-coloured treats: No dyes. If the treat is beige, that’s fine; cats don’t care.
• Single-ingredient treats: PureBites, Vital Essentials (one ingredient, no colour needed).
• Brands that avoid dyes: Churu, Tiki Cat Stix, Orijen, Whole Life Pet (all colour-free).

5. Carrageenan: The Controversial Thickener

What It Is

Carrageenan is a seaweed-derived polysaccharide (Iota, Kappa, Lambda types) used as a thickener and stabiliser in lickable cat treats, wet foods, and some soft treats. It creates the gel-like texture that makes lickable treats squishy and spreadable.

Why It’s in Cat Treats

Lickable treats need a thickener to create the “purée” texture. Without it, you’d have meat-flavoured water. Carrageenan is cheap, effective, and creates a smooth mouthfeel that cats like. Hartz Delectables Stew lists it on the label, alongside guar gum, xanthan gum and locust bean gum. Churu doesn’t use it: Inaba thickens Churu with tapioca and guar gum instead.

The Risk

• Digestive inflammation (controversial): The scientific debate is unsettled. Some studies show that degraded carrageenan (carrageenan broken down by stomach acid) can trigger intestinal inflammation in lab animals. Other studies show no effect with food-grade carrageenan. The issue: food-grade carrageenan is supposed to be non-degraded, but stomach acid can degrade it, and the degraded form is what causes inflammation in rodent studies. The joint FAO/WHO expert committee on food additives (JECFA) concluded in 2007 that there was “no concern for human health” but noted limitations in the data. For cats (smaller digestive tracts, shorter transit times), the risk is unknown but plausible.
• Not necessary: Carrageenan is purely a texture agent. It adds no nutrition. There are other ways to create texture: tapioca starch (Churu uses this), guar gum, or a broth base with just a little xanthan gum (Tiki Cat Stix).

Where You Find It

• Some lickable treats: some Delectables Stew recipes list it, so check the current label
• Some wet cat foods (not just treats; check your cat’s food label)
• Rarely in crunchy treats (not needed for crunch)
• Brands that don’t use it: Tiki Cat Stix (broth-based, thickened with xanthan gum), Churu (tapioca, guar gum and gelatin), some boutique brands

Safer Alternatives

• Broth-based treats: Tiki Cat Stix uses broth as the texture base: no carrageenan, just a little xanthan gum.
• Tapioca starch: Used in Churu and some other lickable treats. A root starch, less controversial than carrageenan, though also a carbohydrate.
• Guar gum: A legume-derived thickener. Generally safer profile than carrageenan, but can cause loose stool in sensitive cats.

6. “Animal Digest” & Unnamed Protein Sources: The Mystery Meat Black Box

What They Are

“Animal digest” is the legal term for hydrolysed animal tissue: the product of boiling slaughterhouse waste (heads, feet, organs, foetuses) in acid until it becomes a liquid slurry. It’s then dried into a powder and used as a “flavour enhancer” or “protein source” in pet food. “Meat by-product meal” is similar: rendered parts from multiple species, ground into meal.

Why They’re in Cat Treats

They’re cheap. Animal digest costs a fraction of what named chicken or tuna costs per kilogram. For budget treat manufacturers, it’s the difference between profit and loss. And it works: the hydrolysation process releases free amino acids that cats can taste, creating an addictive savoury flavour.

The Risk

• Allergen unpredictability: “Animal” can legally mean any mammal: cow, pig, sheep, goat, horse, or euthanised companion animals (though the latter is rare in practice). For a cat with food allergies, you can’t identify the trigger because the protein source is unnamed.
• Quality variability: The input material changes batch to batch: one batch might be poultry heads and feet; another might be beef lungs and livers. There’s no consistency.
• Processing chemicals: The hydrolysis process uses hydrochloric acid or enzymes + heat. The resulting product is a chemically denatured protein, not whole food.
• No species traceability: If the label says “animal digest” or “meat by-product meal,” you don’t know what animal it came from. This is legal, but opaque.

Where You Find It

• Budget crunchy treats: “chicken by-product meal” or “meat meal” as the first protein
• Semi-moist treats: “animal digest” hidden in the flavour system
• Temptations Classic: “chicken by-product meal” as the first ingredient
• Any treat with “animal,” “meat,” or “poultry” as the first ingredient without a species name

Safer Alternatives

• Named single protein: PureBites (chicken breast), Vital Essentials (chicken breast), Orijen (chicken, turkey, flounder; all named).
• Species-specific protein: “Chicken meal” is better than “meat meal”: at least you know the species. But whole chicken breast is better than chicken meal.
• Whole-animal treats: Freeze-dried whole minnows, whole chicken hearts. You can see what you’re feeding.

7. Artificial Flavours: The Chemical Imitation of Real Food

What They Are

“Natural flavour” and “artificial flavour” are legal terms that can hide dozens of chemical compounds. In pet food, “natural flavour” can come from hydrolysed animal tissue (animal digest), yeast extract, fermentation, or plant-derived essential oils. “Artificial flavour” is purely synthetic, made in a lab.

Why They’re in Cat Treats

Flavour is the #1 driver of palatability. A treat that doesn’t taste good doesn’t sell. Manufacturers use flavour systems to:

1. Mask undesirable base notes from cheap fillers (corn, wheat, soy)
2. Create a signature “cat loves it” profile that’s consistent across batches
3. Make bland ingredients taste like meat without using expensive real meat

The Risk

• Transparency black box: “Natural flavour” can legally include hydrolysed animal tissue, MSG, yeast extract, or essential oils; you don’t know which. For a cat with food allergies, this is a hidden trigger variable.
• Chemical complexity: A single “artificial chicken flavour” can contain 10-15 synthetic compounds. The cumulative metabolic exposure over years is unstudied.
• No nutritional value: These are sensory chemicals, not nutrients. They don’t contribute protein, vitamins, or minerals.

Where You Find It

• Almost every treat under $3/100g
• Temptations: “Natural flavors” on the label, with no clue to the source
• Friskies: Both “natural” and “artificial” flavours
• Any treat that says “chicken flavour” instead of “chicken”

Safer Alternatives

• Ingredient-flavoured: If the first ingredient is “chicken breast,” the flavour is the chicken itself, no “flavour” chemical needed. PureBites, Vital Essentials, Whole Life Pet, and Orijen work this way.
• Single-ingredient: No flavour system, no chemicals, just one protein. The cat tastes the protein, not a lab imitation.
• Lickable treats without artificial flavours: Tiki Cat Stix and Churu list only “natural flavors” alongside real broth or meat.

8. The “Healthy” Treat That Isn’t: Misleading Marketing Claims on Cat Treats

Even after you’ve learned the individual ingredients, there’s one more layer of defense: the health claim on the front of the bag.

The “Dental” Claim Without VOHC

Many treats say “supports dental health.” Few have the VOHC (Veterinary Oral Health Council) seal; the best known is Greenies Feline Dental, accepted for tartar control only (not plaque). The VOHC requires clinical trials proving tartar reduction. Without the seal, “dental” is a marketing term.

Check: Look for the VOHC logo (a hexagon shape with a tooth and checkmark). If it’s not there, the dental claim is unproven.

The “Calming” Claim Without Clinical Trials

Treats saying “calming” usually contain tryptophan or chamomile. Neither has robust clinical evidence in cats. Calming products with published research behind their active ingredients include VetriScience Composure chews (colostrum + L-theanine) and Zylkene (alpha-casozepine, a supplement rather than a treat). If the claim isn’t backed by a named study, it’s anecdotal.

The “Grain-Free” Claim That Doesn’t Mean Hypoallergenic

“Grain-free” means no wheat, corn, or rice. It doesn’t mean no other allergens. Many grain-free treats add chickpea flour, pea protein, or potato starch, all of which can be allergens for some cats. Single-ingredient is safer than grain-free.

The “Natural” Claim That Means Nothing (Legally)

There is no legal definition of “natural” in pet food in the US or UK. It’s a marketing term. A treat can say “all-natural” while containing artificial flavours, synthetic preservatives, and chemical processing aids. Ignore the word; read the ingredients.

The “Human-Grade” Claim That Doesn’t Mean Certified

“Human-grade” means the ingredients are theoretically fit for human consumption, but there’s no certification or third-party audit. It’s a quality signal, but not a guarantee. “USDA-certified organic” is a guarantee; “human-grade” is a claim.

Guide to Choosing Safe Cat Treats: The Quick Checklist

After everything we’ve analysed, here’s the 30-second filter:

1. First ingredient: Is it a named animal protein (chicken, tuna, salmon, turkey) or a vague term (“meat meal,” “animal digest,” “poultry by-product”)?
2. Ingredient count: Under 10 = good. Under 5 = excellent. 1 = gold standard.
3. Artificial colours? If you see Red 40, Yellow 5, Blue 2, put it back.
4. Preservatives: BHA, BHT, ethoxyquin = bad. Mixed tocopherols, rosemary extract, no preservatives = good.
5. Thickeners and humectants: Carrageenan and propylene glycol = caution. Tapioca starch and guar gum = better. Minimal thickener = best (Tiki Cat Stix: mostly broth, with a little xanthan gum).
6. Calories: Check kcal/piece. Is it under 2 kcal? If over 3 kcal per piece, count carefully (some larger freeze-dried pieces run 3-4 kcal).
7. VOHC seal: For dental treats, the hexagon + tooth logo is the only proof of dental efficacy.
8. Price: Under $5/100g = budget (likely contains fillers and additives). $5-10/100g = mid-tier (usually cleaner). Over $10/100g = premium (should be single-ingredient or certified organic).

The Bottom Line

The cat treat industry is under-regulated. There’s no FDA pre-market approval for “healthy” claims. The only thing between your cat and a bad treat is your ability to read the label.

The 12 ingredients above are the most common red flags we found across 50+ products. Avoiding them doesn’t mean buying only expensive treats; it means being selective about what you buy at every price point.

At every budget level, there are safer choices:

• Budget ($2-3/100g): Look for “chicken” or “tuna” as first ingredient, under 15 ingredients, no BHA/BHT
• Mid-tier ($5-8/100g): Look for single protein, under 8 ingredients, no artificial colours
• Premium ($10+/100g): Look for single-ingredient, organic-certified, or human-grade; you’re paying for transparency, not just marketing

The safest treats based on ingredient analysis: PureBites Freeze-Dried Chicken (one ingredient), Tiki Cat Stix (seven ingredients, broth-based, xanthan gum the only thickener), Churu (around nine ingredients, no artificial anything), and Vital Essentials (one ingredient, freeze-dried chicken breast).

Next: Read our guides on are cat treats bad for cats, worst cat treats, best soft cat treats, how many treats per day, and the best cat treats for every need.