Best Capsule Cat Antioxidant Supplements in 2026

Urinary Tract Support - Zesty Paws Cranberry Bladder Bites are formulated to promote kidney & bladder health. With 200 mg of cranberry & organic ingredients, these chewables can help pets UT wellness.

Enhanced with Cran-Max Cranberry - Each chew contains 200mg of Cran-Max, a pure Cranberry concentrate formulated with patented Bio-Shield technology - clinically proven to promote bladder & urinary health.

Promotes Kidney & Bladder Health - These chews also contain Organic Marshmallow Root & Astragalus help flush toxin buildups from the kidney & bladder for comfortable urination, & include anti-inflammatory properties.

L-Lysine supplement for cats; supports normal eye function, respiratory health, strong immune system

Helps manage common feline health issues; sneezing, runny nose, squinting and watery, inflamed eyes

One to two scoops daily provides support for the immune and respiratory system for kittens and cats

SUPPORTS A HEALTHY IMMUNE SYSTEM: GREENIES Immune Health Supplements are designed to support your adult and senior dog’s healthy immune system

ANTIOXIDANT BLEND OF VITAMIN C & E: An irresistible premium soft chew made with a powerful blend of antioxidants that helps support your dog’s natural defenses.

FORMULATED BY Ph.D. ANIMAL NUTRITIONISTS: A team of Ph.D. Animal Nutritionists developed a supplement your dog will love.

Antioxidant supplement that supports heart function cardiovascular health in senior dogs that are 6 years old or older

Can slow the aging process and the progression of chronic degenerative diseases

Coenzyme Q10 is a compound that is made naturally in the body, used for cell regrowth and to protect cells from damage. As your pet companion gets older, the body produces less and less. Dr. Harvey’s Coenzyme Q10 provides the additional cellular boost for health and wellness in senior pets

Omega 3 Fatty Acids with vitamins for a healthy skin and coat

For healthy skin and coat in dogs

A convenient soft gel capsule

Supports immune system function and performance in dogs, cats and birds

DMG is an adaptogen that helps the body cope with various forms of stress

DMG supports performance by enhancing circulation, efficient oxygen utilization, and muscle recovery

URINARY TRACT SUPPORT - Our Berry Balance Chews is natural, holistic, and grain-free cranberry relief for cats and dogs, rich with antioxidants, and is specially formulated for your friend's urinary tract health, kidney and bladder wellness

KIDNEY + BLADDER RELIEF - Cranberry and blueberry are rich with antioxidants and vitamin C that can help support kidney and bladder health while promoting urinary tract function

AMERICA'S FIRST HOLISTIC PET FOOD: Solid Gold has been delivering transformative nutrition for your pet since 1974, crafting recipes with functional superfoods, omega fatty acids, high quality proteins, and protected probiotics to support gut health and overall well being

CHOOSING A PROBIOTIC FOR YOUR PET - Cat probiotics are used to boost the immune system, aid in digestion leading to improvements in their mood, fur & skin appearance, breath & overall health. Probiotics for cats may also be useful after surgery or if your pet is prone to digestive issues. With a guaranteed amount of four different live and active cultures as well as a prebiotic inulin to nourish and promote the growth of good bacteria, you will see a difference in how your pet feels and acts.

GUARANTEED QUALITY - Inulin is a soluble fiber found in a wide variety of fruits, vegetables, and herbs. It is a prebiotic that feeds good bacteria to the gut, and nourish colon cells. This cat probiotic is used to help promote weight loss, relieve constipation, diarrhea, & help control diabetes. Inulin is not digested or absorbed in the stomach. Once consumed it then goes straight to the bowels where bacteria is able to use it for good. Advita is microencapsulated for better long term efficacy.

HEALTHY IMMUNE SYSTEM - Advita is an encapsulated probiotic and won't activate until it reaches the GI Digestive System. Advita Probiotic Powder contains Vitamins A, E, and C. Vitamin A has been proven to support healthy eyes, including night vision, and skin health. Vitamin E supports the immune system and growth of red blood cells. Vitamin C is an important antioxidant for your pet. Use daily to help maintain your pet's appetite, digressional track, and healthy, shiny and soft coat.

Supports Health and Seasonal Changes - Helps maintain normal respiratory functoin and health during seasonal changes.

Amounts that Count - Each serving contains 50mg Vitamin C, 10mg Quercitin, and 10mg Omega-3's.

Reduces Allergic Response - Quercetin and citrus bioflavonoids reduce allergic responses.

DOG IMMUNE SUPPORT: Fuel your pet with the support he needs to stay healthy and support his immune system.

PET HEALTH SUPPLEMENT: Give your furry friend the immune support he needs with these health supplements for dogs and cats that include some natural ingredients such as maitake mushrooms, shiitake mushrooms, turkey tail mushrooms and reishi mushrooms.

PET IMMUNE SUPPORT FORMULA: A healthy immune system is essential for dogs and cats. Ensure your furry friend remains active and healthy with these pet health supplements that support normal inflammatory response while supporting T-helper cell activity.

THE IDEAL SKIN, BRAIN AND IMMUNE HEALTH SUPPLEMENT – Support your dog and cats dry, flaky and itchy skin with our liquid fish oil food supplement. Regular intake of EPA and DHA-enhanced Fish Oil supplements maintains your pet's coat and skin health. Please Note: We've upgraded to a more eco-friendly dispenser and removed the pumps as part of our larger effort towards environmental sustainability.

UNLEASH THE POWER OF OMEGA-3 – Our Fish Oil complex is packed with OMEGA-3 Fatty Acids and contains 900 mg of EPA and 600 mg of DHA. This all natural combination provides a synergistic effect to maintain your pet’s skin, immune, brain health and function.

MADE ONLY FROM WILD CAUGHT FISH – Our special formulation only uses sustainable and high quality wild caught Icelandic Fish. Derived from Icelandic Sardines, Anchovies, Herring, and Mackerel, our all natural unrivaled purity is perfect for your dog or cats healthy coat.

Cranimals is a whole food antioxidant supplement for your dog or Cat

Cranimals is made from cranberries, Red raspberries and Blueberries and contain many potent antioxidants

Cranimals is a simple way to add Nature's goodness to your pet's kibble or wet food

Developed & tested by the makers of vet-recommended Advantage flea & tick protection

NUTRITIONAL SUPPLEMENT FOR HEALTHY AGING AND JOINT SUPPORT: A unique daily supplement that promotes joint health and helps maintain comfort throughout the body as dogs age

MULTIPLE BENEFITS: Alenza provides more than just joint support, it supports multiple systems throughout the body, including a normal inflammatory response in dogs for whole body comfort

Wild Krill from the Pristine Waters of Antarctica Contain High Levels of the Natural Antioxidant, Astaxanthin, which Gives Krill its Deep, Red Color.

Antioxidants have been Shown to Aid in the Elimination of Harmful Molecules Called “Free Radicals.”

Grizzly’s Krill Oil Contains up to EIGHT Times More Astaxanthin than Krill Oil for Humans, Making it an Extremely Powerful Antioxidant for Dogs and Cats.

HIGH-QUALITY ALLERGY SUPPLEMENT FOR DOGS, CATS: Help your furry friend weather the changes in season with this NaturVet Aller-011 Advanced Allergy Aid for Dogs and Cats. This pet supplement is rich in antioxidants, omegas, DHA and EPA to help boost your pet’s immune system.

VITAMIN-ENHANCED PET SUPPLEMENTS FOR ALLERGIES: Ensure that your canine companion receives the nutrients he needs with these dog allergy supplements and cat allergy supplements that are cGMP compliant and made in the USA.

DOG, CAT SUPPLEMENTS FOR IMMUNE SYSTEM SUPPORT: Available in soft chews, tablets and powder form, these dog and cat supplements for allergies are veterinarian formulated and designed to help combat environmental pollutants while supporting your pet’s immune system, skin moisture and respiratory health.

CARDIOVASCULAR SUPPORT DOG SUPPLEMENT – Improve your dog's overall health and wellness with GNC Pets ADVANCED Cardio Soft Chews, made with botanicals, antioxidants, and amino acids

EASY TO CHEW DOG SUPPLEMENT – If your dog has an aversion to swallowing pills, these easy to chew soft chews are the way to go! They make getting the nutrients your dog needs easier than ever

DELICIOUS CHICKEN FLAVOR DOGS LOVE – GNC Pets ADVANCED Dog Cardio Soft Chews for Dogs satisfy their taste buds while improving their insides

💊Azovast Plus probiotic 120 Caps is Renal Home Care Product to help support kidney function; safe for cats & dogs of all ages and sizes

💊Contains Four beneficial probiotics to help promote good kidney health, Quality of Health, Quality of Life (QOL) & manage renal toxins

💊Azovast Plus for Dogs and Cats is suitable for pets of all sizes who need extra kidney health support

✅ BETTER QUALITY OF LIFE. Are you concerned about your pet's quality of life? Outward signs of discomfort, anxiety, and stress can have a devastating impact on our pet family. We're here to help.

✅ IMMUNE. Vet-strength herbal formula for dogs and cats supports your pet's immune system and overall health and vitality. It really is GOLD when your pet’s quality of life has been compromised.

✅ PROTECTION. Antioxidants help protect your pet from oxidative stress due to free-radical damage. Ongoing damage to healthy cells can impair immune function and make your dog or cat more vulnerable to cancer. Life Gold herbal ingredients help provide antioxidant support and protection.

SCIENTIFICALLY FORMULATED - Spry Ocular and Respiratory Support is formulated with natural ingredients to boost the body's defense systems and restore the body's natural, healthy processes.

PREVENTATIVE SOLUTION - Spry is an ideal preventative solution for cats with weak immune systems, senior cats, recently adopted feline friends, and outdoor cats.

NATURAL INGREDIENTS YOU CAN TRUST - Every serving of Spry contains clinically tested levels of L-Lysine, while whole blueberries and sweet potatoes provide a rich source of vitamins and antioxidants to support eye and lung health. Organic ingredients to care for the 70% of the immune system that is contained in the digestive tract, supporting the body's natural defenses from the inside out.

Effective Formula: This anti nausea medication was specifically designed for your dog’s needs. It helps relieve motion sickness and carsickness for any type of travel or trip, long or short.

Easily Digested: Our anti-nausea formula is a great non-sedative solution that's gentle on your furry best friend's belly.

Easy to Swallow: Small and odor free, our motion sickness pills work quickly to calm stomach upset. Give to your pup 30 minutes before traveling to help soothe the belly and car sickness and stop disorientation. Works up to 6-8 hours on most dogs.

🌿 Immune Support for Cats: Fuel your pet with the supplements they need to remain healthy and boost their immune system with cat health supplements that add much-needed nutrients and amino acids to continue being active.

💊 L-Lysine: L-Lysine is an essential amino acid that your pet’s body doesn’t produce, so this supplement is the perfect aid that helps support your pet’s immune system so that it can function normally and produce antibodies. L-Lysine also helps maintain healthy tissue supports respiratory health.

🐈 Pet Health Supplement: A healthy immune system and eye health are essential for cats of any age. Ensure your furry friend remains active with healthy vision with these pet health supplements that help support normal inflammatory response and help support cat-eye health.

HERBAL BLEND PRODUCT: Tossa K contains a blend of herbs to help support respiratory health.

FORMULATED JUST FOR DOGS: Tossa K contains antioxidants to help fight free radicals, supports respiratory health, and supports the immune system.

TOSSA K, KENNEL BARK: Includes one (1oz) bottle, a convenient tool for administration, and easy-to-follow instructions.

NrF2 PROPRIETARY ANTIOXIDANT BLEND FOR CATS | Recommended for growing, adult, and senior cats. Health Defense is formulated with a natural and potent combination of antioxidants that protect the body’s cells from excessive free radical attacks

BIOLOGICALLY-APPROPRIATE, NATURAL INGREDIENTS | Made with biologically-appropriate, high quality, natural ingredients such as Bacopa, Ashwagandha, Milk Thistle, Turmeric, Coenzyme Q-10, and Zinc

PROACTIVE NUTRITIONAL SUPPORT | This unique formula provides support for overall daily health, cellular protection, oxidative stress, and eye, heart, and brain health

ADVANCED IMMUNE SUPPORT FOR CATS: Fuel your pet with the nutrients she needs to stay healthy and boost her immune system with cat health supplements that feature antioxidants and much-needed nutrients and amino acids to stay active.

HELP STRENGTHEN CAT IMMUNITY: Give your furry friend the immune boost she needs with these health supplements for cats that are infused with veterinarian-approved ingredients such as amino acids and L-Lysine.

PET EYE HEALTH SUPPLEMENT: A healthy immune system and eye health is essential for cats of any age. Ensure your furry friend remains active with healthy vision with these pet health supplements that help support normal inflammatory response and cat eye health.

All-In-One Dog Supplement - Multivitamins are important to maintain balanced health. Like humans, dogs or cats also need a complete and balanced diet to meet their nutritional needs. This ultimate pet nutrition powder for older dogs and cats can help keep your four-legged family members healthy and protected from various health problems

Aging Support for Older Pets - As dogs or cats age, their bodies start to deteriorate. Our dog vitamin & mineral powder packs a big nutritional punch to deliver antioxidant support to your senior pets. This nutritional supplement helps improve their bone health, boost their energy and optimizes their mental function

Comprehensive Antioxidant for Senior Cats and Dogs – Our experts ensure that this dog nutritional supplement provides complete wellness support to your beloved pet. This supplement combines Ginkgo Biloba Extract, Reishi Mushroom Extract, Beef Liver Hydrolysate, Chromium Picolinate, Calcium Citrate, Selenium, and Vitamin D3 to help improve your pet's bone, brain, and liver health. It’s a strong antioxidant that helps reduce free-radical activity in your pet’s body

3 active enzymes (Amyloglucosidase, Glucose Oxidase, and Lactoperoxidase.)

Mentioned in Time Magazine's Best Inventions of 2019 list

Toothpaste made in the USA with ingredients from the USA and Finland

Advanced ocular formula with lutein and beta carotene - Spector Blends vitamin C, Beta Carotene, lutein, superfoods and herbs to create this powerhouse formula. Dedicated solely to promoting ocular integrity and structure, Spector addresses all aspects of the eye to ensure your dog’s vision is supported, especially as he ages.

Less greying, more of those puppy dog eyes - old eyes don’t just show years of wisdom, they also show years of wear. Greying eyes are a natural byproduct of aging but that doesn’t mean they can’t be fixed! Spector is chock full of antioxidants that can help reverse greying eyes. You’ll see a difference and so will they.

Perfect for breeds Prone To eye problems - If you have a dog whose breed is more prone to eye problems (think cataracts, PRA, Glaucoma) it’s important to take a proactive stance when it comes to their ocular health. Spector is the ideal vision supplement for dogs because it’s Chocked full of the vitamins and minerals needed to maintain connective tissue and support healthy blood vessels in the eyes.

Quick, Easy, Flavorful Daily Whole Food Skin, Allergy and Immune Support Supplement For Cats. Mixes easily with canned food or just add water for instant hydrating snack.

30 DAY SUPPLY. Each Daily Serving Provides Skin, Allergy and Immune Support for cats of all ages.

NURTURES THE SKIN. Salmon is one of the best sources of omega 3 fatty acids, which are proven to promote healthy skin and shiny coat.

VERSATILE: Each dog anti itch oil capsule is formulated to heal rough, chapped, dry pet’s paw pads. It also prevents excessive licking and itching from allergies. Each capsule contains 2 grams of pet skin oil. The perfect amount! Apply pet oil to your pet who scratches their skin compulsively, consistently chews and licks their paws, has too much keratin on the paw pad, has dry, rough cracked paws, and has black paw pads turning pink.

NO CHEMICAL NASTIES: We use human-grade ingredients that are free of any artificial additives, preservatives, dyes, flavors or harmful chemicals. Dog skin treatment capsules come in a tightly sealed, easy-to-carry bottle.

JASMINE ESSENTIAL OIL: used for relieving stress and depression in pets. Its calming and soothing properties help to reduce anxiety, promote relaxation, and improve mood. Using jasmine oil in aromatherapy for pets can create a peaceful environment and enhance their overall well-being.

HERBAL BLEND PRODUCT: Tossa K contains a blend of herbs to help support respiratory health.

FORMULATED JUST FOR DOGS: Tossa K contains antioxidants to help fight free radicals, supports respiratory health, and supports the immune system.

TOSSA K, KENNEL BARK: Includes one (4oz) bottle, a convenient tool for administration, and easy-to-follow instructions.