Best Dog Antioxidant Supplements Under $100 (2026)
We ranked products by ingredient relevance to antioxidant support, formulation purpose, transparency of sourcing, user-per-dose value, and suitability for common canine health needs
The Verdict
- Best Overall: Grass Green Max Strength Dog Chews with Probiotics — Best for digestion support: chewable probiotic formulation that combines antioxidant focus with urinary and digestive benefits
- Best Value: Grass Green Dog Chews for Lawn Health — Best for lawn-health concerns: probiotic chew format aimed at urine-control and supporting dogs prone to marking
This roundup highlights dog antioxidant supplements under $100 chosen for value, ingredient transparency, and targeted health benefits such as immune, cardiac, liver, kidney, and joint support. Selections were scored by ingredient potency, formulation purpose, third-party sourcing, and overall value to help owners compare options quickly
Top Picks
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1
Best Overall Grass Green Max Strength Dog Chews with Probiotics
Best for digestion support: chewable probiotic formulation that combines antioxidant focus with urinary and digestive benefits
Grass Green Max Strength chews support urinary balance, digestion, and immune health in dogs, with a duck flavor. Customers note effective reduction of yellow lawn spots and improved urinary tract comfort
- 12 natural ingredients
- Supports urinary balance and digestion
- Vet-recommended grass protection concept
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2
Best Value Grass Green Dog Chews for Lawn Health
Best for lawn-health concerns: probiotic chew format aimed at urine-control and supporting dogs prone to marking
Dog urine neutralizer chews supporting gut and urinary health for a greener yard. Contains probiotics and enzymes; dogs may enjoy the taste. Customer note: chews help reduce yellow spots and improve grass health
- grass-focused urine neutralizer
- probiotics and natural ingredients
- dog-friendly taste
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3
Life Line Organic Ocean Kelp for Pets
Best organic kelp option: ocean kelp provides mineral-rich antioxidant support suitable for dogs and cats
Organic ocean kelp supplement for dogs, cats & horses helping coat health, digestion, and dental care. Customers note good quality and digestive benefits with mixed taste and odor opinions
- organic certification
- sustainably harvested from Iceland
- mineral-rich ocean kelp
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4
maxxiSAMe Advanced SAM-e Powder - Liver, Cognitive & Joint Support for Dogs
Best for liver and cognition: SAM-e powder designed to support liver function, cognitive health, and joint comfort
SAM-e powder supporting liver function and cognitive performance in dogs, with user reports of energy and cognitive benefits. Easy to mix with wet food, valued for quality by customers
- liver health support
- cognitive function aid
- simple mix-in with meals
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5
Heart Support Granules for Dogs - Vet-Formulated CardioMAX
Best cardiac nutrient boost: granules formulated to support heart health with omega-3s and taurine inclusion
Vet-formulated heart health supplement for dogs, featuring L-Taurine, L-Carnitine, CoQ10 and omega-3s to support cardiovascular function. One customer notes improved immune support in a 6-year-old lab
- L-Taurine and L-Carnitine core nutrients
- Antioxidant blend including CoQ10
- Omega-3 fatty acids support heart health
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6
NaturVet Mushroom Max Advanced Immune Support Dog Supplement
Best immune blend: mushroom-based, vet-formulated supplement focused on advanced immune support
Dog immune support supplement with maitake, shiitake and reishi mushrooms. Helps support normal inflammatory response and overall health. Customer insight notes mixed taste and texture but positive immune support feedback
- mushroom-based immune support
- vet-formulated antioxidant blend
- includes multiple mushroom types
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7
Azovast Plus Kidney Health Paste for Dogs & Cats
Best kidney-support paste: probiotic-enhanced paste designed to support renal health in dogs and cats
Oral probiotic paste to support kidney function in dogs and cats. Chicken flavor; no refrigeration needed. Customers note potential kidney benefits and that it helps with UTIs, though opinions vary on value and size
- probiotic paste for kidney support
- no refrigeration required
- chicken-flavored formula
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8
Quercetin for Dogs – Allergy relief (2 Pack)
Best for allergies: quercetin formulation concentrated on allergy relief and immune support for dogs
Quercetin for Dogs in liquid form for allergy support and immune help. customers note it eases itching and paw licking and is easy to administer
- all-natural formula
- easy-to-administer liquid
- tackles allergies and immune support
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9
Cardio support for dogs with antioxidants and vitamins
Best cardio-antioxidant combo: targeted formula combining antioxidants with L-carnitine and L-taurine for heart support
Cardio support supplement for dogs with L-carnitine, L-taurine, CoQ10 and vitamin E to aid cardiovascular health. Customers note improved energy and heart health, with some concerns about taste
- L-carnitine and L-taurine combination
- CoQ10 and vitamin E for heart health
- cardiovascular and circulatory support
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10
Nzymes Antioxidant Tiny Treats for Dogs – 270 chews
Best treat-style antioxidant: enzyme-rich chewable treats offering antioxidant support in a high-count chew format
Antioxidant dog chews rich in enzymes for small dogs; supports joints, skin, digestion, and energy. Customers note improved mobility after a week and overall health benefits
- enzyme-rich antioxidant protection
- supports joints and mobility
- positive effects on skin and energy