These ingredients are often allowed under “natural” labeling rules, yet some pet owners and veterinarians prefer to limit or avoid them due to mixed research, sensitivities, or how they’re used.
Mixed Tocopherols (Vitamin E)
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Why used: Natural preservative to prevent fat oxidation
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Why controversial: Generally safe, but effectiveness varies; often paired with other preservatives
Rosemary Extract
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Why used: Natural antioxidant
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Why controversial: May trigger digestive upset or neurological sensitivity in some pets (especially those prone to seizures)
Citric Acid
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Why used: Preservative and pH stabilizer
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Why controversial: Naturally derived, but sometimes used alongside synthetic preservatives without clear labeling
Ascorbic Acid (Vitamin C)
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Why used: Antioxidant and preservative
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Why controversial: Usually safe, but unnecessary in excess and occasionally irritating for sensitive pets
Green Tea Extract
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Why used: Antioxidant properties
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Why controversial: Contains compounds that may not be ideal for pets in concentrated forms
Clove Extract
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Why used: Natural antioxidant
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Why controversial: Potent compounds; concerns about irritation or toxicity at higher concentrations
Oregano Extract
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Why used: Natural antimicrobial
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Why controversial: Strong essential oils may irritate sensitive digestive systems
Sage Extract
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Why used: Antioxidant preservative
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Why controversial: Limited long-term pet-specific research
How to Think About These Ingredients
“Natural” doesn’t always mean better or necessary.
What matters most is:
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Quantity used
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Overall formulation
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How your pet responds
For pets with allergies, digestive issues, or neurological sensitivities, simpler formulations with minimal additives are often preferred.