Top rated dog antioxidant supplements

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AI-generated summary · updated July 29, 2026 · verify details before purchase.

1. 

   1 Best overall VETRISCIENCE

   VetriScience Laboratories Vetri-Mega Probiotic for Dogs

   ★★★★☆4.5/5 $32.96

   Combines probiotics with antioxidants to support digestive and immune health.

   • High potency
   • Suitable for all breeds
   • Easy to administer

   • Requires refrigeration

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2. 

   2 Best value Zesty Paws

   Zesty Paws Advanced Antioxidants for Dogs

   ★★★★★4.6/5 $26.97

   Contains CoQ10, L-Carnitine, and vitamins E & C for heart and immune support.

   • Helps with aging dogs
   • Great ingredients
   • Good price

   • Large pill size

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3. 

   3 Best budget pick Veterinary Formula

   Veterinary Formula Optimal Antioxidant Support for Dogs

   ★★★★☆4.4/5 $14.97

   Affordable formula with vitamins, minerals, and antioxidants for daily wellness.

   • Low cost
   • Good quality
   • Easy to mix with food

   • Mild odor

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4. 

   4 Best joint & antioxidant combo Nutramax Laboratories

   Nutramax Cosequin for Dogs with Antioxidants

   ★★★★★4.7/5 $34.91

   Supports joint health with glucosamine and added antioxidants for immune function.

   • Trusted brand
   • Dual action
   • Vet recommended

   • Pricey

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5. 

   5 Best natural option Dr. Harvey's

   Dr. Harvey's Antioxidant Support for Dogs

   ★★★★☆4.3/5 $26.95

   Plant-based ingredients like turmeric, milk thistle, and green tea for free radical defense.

   • Organic ingredients
   • Grain-free
   • Supports liver health

   • Strong taste
   • Not for picky eaters

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6. 

   6 Best immunity support Pet Honesty

   PetHonesty Antioxidant Support for Dogs

   ★★★★☆4.5/5 $32.99

   Contains astragalus root, reishi mushroom, and antioxidants for immune system health.

   • Mushroom blend
   • Tasty soft chews
   • Manufactured in USA

   • Low fiber

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7. 

   7 Best for seniors Rx Vitamins

   Nature's Bounty for Dogs Antioxidant Support

   ★★★★☆4.2/5 $18.00

   Formulated for older dogs with vitamin E, beta-carotene, and selenium.

   • Senior-friendly
   • Easy on stomach
   • Budget-friendly

   • Low review count

   View on Amazon

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