Best Dog Vitamin C Supplements (2026) – Top 10 Reviewed
While dogs can produce vitamin C naturally in their livers, stress, illness, aging, and intense physical activity can deplete their levels faster than their bodies can replenish. Vitamin C is a powerful antioxidant that supports immune function, collagen production, joint health, and overall cellular protection. If your veterinarian has recommended vitamin C supplementation or you want to give your dog an immune boost, this guide covers the best vitamin C supplements for dogs available today.
Our Top Picks at a Glance
- Best Overall: Nutrition Strength Vitamin C for Dogs – Comprehensive formula with CoQ10 and selenium
- Best Value: Dogzymes Super-C Powder – High-potency buffered vitamin C at incredible value
- Best Premium: Rx Vitamins Bio-C Formula – Vet-recommended sodium ascorbate powder
Quick Comparison
| Product | Key Ingredients | Form | Servings | Best For |
|---|---|---|---|---|
| Nutrition Strength Vitamin C | Vitamin C, CoQ10, Zinc, Selenium | Chewable Tablets | 120 | Overall immune and heart health |
| Dogzymes Super-C Powder | Sodium Ascorbate, Ascorbic Acid | Powder | ~400 | Multi-dog households |
| Rx Vitamins Bio-C Formula | Sodium Ascorbate (Vitamin C) | Powder | 4 oz | Vet-recommended immune support |
| Special Breed Vitamin C Liquid | Vitamin C, Bacon Flavor | Liquid | 2 oz | Picky eaters |
| Zesty Paws 8-in-1 Multifunctional | Vitamin C, E, Glucosamine, Probiotics | Soft Chews | 90 | Total wellness support |
| PetLab Co. 13-in-1 Dog Multivitamin | Vitamins C, A, E, D, B12 | Soft Chews | 30 | Daily multivitamin with vitamin C |
| Natural Dog Company Skin & Coat | Vitamin C, Biotin, Omega-3, EPA, DHA | Soft Chews | 90 | Skin health and collagen support |
| Nutri-Vet Multi-Vite Chewables | Vitamin C, Multi-Vitamins, Minerals | Chewable Tablets | 120 | Budget daily vitamin C |
| Dr. Goodpet Crystal C Powder | Organic Vitamin C (Ascorbic Acid) | Powder | 7 oz | Gum health and detox support |
1. Nutrition Strength Vitamin C for Dogs – Best Overall
- Highly rated supplement to support cardiovascular health in dogs: 365 day guarantee; if you are not happy with our vitamin C for dogs tablets, simply contact us for a full refund; we want you to be completely satisfied with our premium supplement; as plenty of studies have found associations between low vitamin C status and increased risk of cardiovascular issues, our supplement will help ensure that your pet gets enough of the critically important micronutrient
- Strengthen the immune system in dogs: Nutrition Strength's premium vitamin C tablets for dogs ensure that your pet gets sufficient amounts of ascorbic acid (vitamin C), which takes an essential part in the body's natural immune defenses by supporting multiple cellular functions of both the innate and adaptive immune systems; studies have found a cause and effect relationship between the supplemental intake of vitamin C and the functioning of a normal immune system
- Boost antioxidant function and free radical defenses: antioxidants such as ascorbic acid (vitamin C) are compounds which inhibit oxidation, a chemical reaction which can produce free radicals, in turn leading to chain reactions which may damage the cells of the organism; antioxidants terminate these chain reactions; moreover, vitamin C is an important physiological antioxidant and has been shown to regenerate other antioxidants in the body, including alpha tocopherol (vitamin E)
- Maintain synthesis of collagen in dogs of all ages, shapes and sizes: research has established that ascorbic acid functions as a cofactor for enzymes involved in the biosynthesis of collagen, carnitine and norepinephrine; vitamin C deficiency leads to impaired collagen synthesis with potentially negative consequences, as collagen is the most abundant protein in mammals and is the main component of the various connective tissues in the body
- Made in the USA: Nutrition Strength's vitamin C for dogs to support cardiovascular health, help strengthen the immune system, boost free radical defenses and sustain collagen synthesis is human grade; our premium vitamin C tablets for dogs meet the strictest animal supplement manufacturing guidelines, to guarantee your pet's safety, and are made with carefully selected, high quality ingredients for optimal results
Nutrition Strength combines ascorbic acid with CoQ10, zinc, and selenium for a comprehensive vitamin C formula that goes beyond basic supplementation.
This chewable tablet delivers vitamin C as ascorbic acid alongside Coenzyme Q10, zinc oxide, and selenomethionine. The combination supports cardiovascular health, immune function, free radical defense, and collagen synthesis. Vitamin C acts as the first line of antioxidant defense while CoQ10 supports cellular energy production. Zinc and selenium provide additional immune and antioxidant benefits. With 120 chewable tablets per bottle and a 365-day guarantee, it’s a solid long-term investment in your dog’s health. Made in the USA with human-grade ingredients.
What We Like
- Complete formula with CoQ10, zinc, and selenium for enhanced benefits
- 120 chewable tablets provide excellent value and supply
- Human-grade, USA-made with a 365-day money-back guarantee
What Could Be Better
- Ascorbic acid form may cause loose stools at high doses
- Tablet form may not appeal to all dogs
Bottom Line: Nutrition Strength Vitamin C for Dogs is the most comprehensive vitamin C supplement available, pairing ascorbic acid with the supporting nutrients that maximize its effectiveness.
2. Dogzymes Super-C Powder – Best Value
- Fight free radicals and boost Vitamin C of any diet with Dogzymes Super C
- Odorless, flavorless and very concentrated!
- Sodium Ascorbate (Buffered Vitamin C), Ascorbic Acid (Vitamin C)
- Mix into food or feed directly
Delivering 2,850mg of vitamin C per teaspoon, Dogzymes Super-C provides incredible potency and value in a simple powder format.
This 1-pound jar of buffered vitamin C powder combines sodium ascorbate (a non-acidic, buffered form) with ascorbic acid to provide 2,850mg of vitamin C per teaspoon. The buffered form is gentler on the stomach than pure ascorbic acid, reducing the risk of digestive upset. It’s odorless, flavorless, and highly concentrated, making it easy to mix into any food without your dog noticing. At just 1/4 teaspoon daily for any body weight, one jar can last a 40-pound dog over a year. Made with human-grade ingredients.
What We Like
- Exceptionally high potency at 2,850mg per teaspoon
- One pound jar lasts over a year for most dogs
- Buffered form is gentle on stomachs; odorless and flavorless
What Could Be Better
- No additional supporting nutrients like zinc or selenium
- Requires measuring and mixing with food
Bottom Line: For pure vitamin C supplementation at an unbeatable value, Dogzymes Super-C delivers maximum potency with minimal fuss, especially ideal for multi-dog households.
3. Rx Vitamins Bio-C Formula – Best Vet-Recommended
- Kitten & Puppy Vitamins: Immune system support for young pets is crucial, especially if they board, travel, or have siblings. This cat and dog vitamin C powder helps boost the immune system.
- Detoxification Help with Potent Vitamin C: This cat and dog supplement provides a powerful dose of Vitamin C, which also helps support natural detoxification and elimination.
- Cat & Dog Health Made Easy: This powdered vitamin C supplement can be scooped & sprinkled over your pet's favorite meal for a daily dose they'll love. No fighting with pills or guessing on doses!
- Palatable Vitamin C for Pets: This vitamin supplement for cats and dogs uses Sodium Ascorbate as a source of Vitamin C, as pets love the taste. Sprinkle over food for a daily dose of immune support!
- Quality Pet Supplements: Recommended by veterinarians, this cat and dog vitamin C powder is made with premium ingredients to ensure quality, purity, and effectiveness.
Trusted by veterinarians since 1998, Rx Vitamins Bio-C uses sodium ascorbate for stomach-friendly vitamin C that pets actually enjoy.
Rx Vitamins for Pets is a brand developed specifically to give veterinarians high-quality nutritional treatment options for companion animals. Their Bio-C formula uses sodium ascorbate as the source of vitamin C, which pets love the taste of and which is much gentler on the stomach than standard ascorbic acid. The powder format is incredibly easy to use, simply scoop and sprinkle over food. It supports immune health, detoxification, and overall wellness for both dogs and cats.
What We Like
- Veterinarian-developed and recommended since 1998
- Sodium ascorbate is stomach-friendly and palatable
- Simple powder format sprinkles easily over food
What Could Be Better
- Premium price for a 4-ounce container
- Single-ingredient formula without supporting nutrients
Bottom Line: If your vet has recommended vitamin C supplementation, Rx Vitamins Bio-C is the professional-grade option that veterinarians themselves trust and prescribe.
4. Special Breed Vitamin C Liquid – Best Liquid Option
- Your Pet Is Priority #1: We know pets can be picky with liquid supplements, and we stand by our product no questions ask. If your pet doesn't love this or you don't see results, we want to hear from you.
- Natural Formula: Special Breed Vitamin C Liquid for Dogs is made with natural ingredients to support your pet's immune health.
- Single Active Ingredient: The main ingredient is Vitamin C, so you know your pet is getting the vitamin they need in an easy to adminster form.
- Easy To Administer: Our Vitamin C supplement in liquid form makes it easy to give your puppy or dog the Vitamin C they need.
- USA Made: Proudly manufactured in the USA, ensuring strict quality control and safety standards.
This bacon-flavored liquid vitamin C makes immune support effortless for dogs who refuse pills and powders.
Special Breed’s liquid vitamin C features a single active ingredient approach, delivering pure vitamin C in a tasty bacon-flavored liquid that’s easy to administer. You can give it directly by mouth, mix it into food, or add it to water. The natural formula is made in the USA with strict quality control and safety standards. The 2-ounce bottle is compact and convenient, making it ideal for daily supplementation or use during periods of illness or stress when your dog’s vitamin C needs increase.
What We Like
- Bacon flavor makes administration easy and stress-free
- Single active ingredient for targeted vitamin C supplementation
- USA-made with strict quality control standards
What Could Be Better
- Small 2-ounce bottle may not last long for larger dogs
- Limited to vitamin C without supporting antioxidants
Bottom Line: Special Breed’s liquid vitamin C is the simplest way to supplement your dog’s vitamin C intake, especially if they’re picky about tablets and powders.
5. Zesty Paws 8-in-1 Multifunctional Supplements – Best All-in-One
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Get your dog’s vitamin C as part of an 8-in-1 formula that also covers joints, gut health, skin, immune function, and more.
This multifunctional supplement packs vitamin C alongside glucosamine, chondroitin, probiotics, omega fish oil, vitamin E, and other key nutrients into one tasty soft chew. The vitamin C works synergistically with vitamin E to provide enhanced antioxidant protection while supporting collagen synthesis for joint and connective tissue health. The pumpkin-flavored chews are suitable for dogs of all ages, breeds, and sizes, making it a convenient way to cover multiple nutritional bases with a single product.
What We Like
- 8-in-1 formula eliminates the need for multiple separate supplements
- Vitamin C and E work synergistically for enhanced antioxidant protection
- Popular pumpkin flavor with high acceptance rates
What Could Be Better
- Vitamin C dose is lower than in dedicated supplements
- Premium price for a multivitamin product
Bottom Line: Zesty Paws 8-in-1 is perfect if you want vitamin C as part of a comprehensive wellness routine rather than as a standalone supplement.
6. PetLab Co. 13-in-1 Dog Multivitamin – Best Brand Reputation
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PetLab Co. packs vitamin C into their popular 13-in-1 formula alongside vitamins A, E, D, and B12 for well-rounded daily nutrition.
From one of the most recognized names in pet supplements, this 13-in-1 multivitamin delivers vitamin C as part of a comprehensive nutrient blend. The formula supports immune response, skin and coat health, joint comfort, and overall vitality. Made exclusively in the USA with high-quality ingredients, the pork-flavored chews are designed for high palatability. The brand’s strong reputation and extensive customer base provide confidence in product quality and effectiveness.
What We Like
- 13 essential vitamins and minerals in one convenient chew
- Strong brand reputation with excellent customer reviews
- Exclusively manufactured in the USA
What Could Be Better
- Only 30 chews per bag requires monthly repurchasing
- Not optimized for dogs needing high-dose vitamin C therapy
Bottom Line: PetLab Co.’s multivitamin is an excellent everyday option for dogs who need basic vitamin C along with a complete spectrum of essential nutrients.
7. Natural Dog Company Skin & Coat Chews – Best for Collagen Support
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These chews leverage vitamin C’s role in collagen production to support skin health, wound healing, and coat quality.
Natural Dog Company combines vitamin C with biotin, vitamin E, EPA, DHA, omega-3 and omega-6 fatty acids to create a skin-focused supplement. Vitamin C is essential for collagen synthesis, the protein that gives skin its structure and supports wound healing. By pairing vitamin C with omega fatty acids and other skin-supporting nutrients, this formula addresses both the structural and nutritional aspects of skin and coat health. Suitable for all ages, sizes, and breeds with NASC certification for quality.
What We Like
- Targets collagen production for skin structure and wound healing
- Rich in omega fatty acids for comprehensive skin and coat support
- NASC-certified quality from a trusted brand
What Could Be Better
- More expensive than basic vitamin C supplements
- Skin-focused formula may not meet broader vitamin C needs
Bottom Line: If your dog needs vitamin C primarily for skin health and collagen support, Natural Dog Company’s targeted formula is specifically designed for that purpose.
8. Nutri-Vet Multi-Vite Chewables – Best Budget Option
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Get daily vitamin C alongside a full multivitamin profile at a price point that works for any budget.
Nutri-Vet’s Multi-Vite Chewables deliver vitamin C as part of their balanced vitamin and mineral formula. These liver-flavored tablets are formulated by veterinarians to support a balanced diet and general health in dogs of all ages and breeds. At 120 chewables per bottle, you’re getting one of the most affordable daily supplement options on the market. The product meets NASC quality standards and is made in the USA.
What We Like
- Incredibly affordable with 120 chewable tablets per bottle
- Veterinarian-formulated and NASC-certified
- Liver flavor most dogs enjoy
What Could Be Better
- Lower vitamin C concentration than dedicated supplements
- Basic formulation without premium antioxidant partners
Bottom Line: Nutri-Vet Multi-Vite is the smart choice for pet parents who want basic daily vitamin C coverage at the lowest possible price point.
9. Dr. Goodpet Crystal C – Best Organic Powder
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This 100% organic vitamin C powder supports immune health, gum health, and detoxification in a simple sprinkle-over-food format.
Dr. Goodpet Crystal C is a high-quality organic vitamin C powder designed to boost the immune system, fight gum disease and gingivitis, and support natural detoxification and elimination. The powder format is easy to sprinkle over your dog’s food for a daily dose they won’t even notice. Made with premium ingredients and recommended by veterinarians, this 7-ounce container provides a generous supply. It’s also suitable for cats, making it versatile for multi-pet households.
What We Like
- 100% organic vitamin C from a trusted brand
- Supports gum health in addition to immune function
- Generous 7-ounce container for lasting supply
What Could Be Better
- Pure ascorbic acid form may cause digestive upset in sensitive dogs
- No buffering agents to reduce stomach irritation
Bottom Line: Dr. Goodpet Crystal C is an excellent organic vitamin C powder for pet parents who want a clean, simple supplement with the added benefit of dental health support.
How to Choose the Best Vitamin C Supplement for Your Dog
Choosing the right vitamin C supplement for your dog depends on several important factors. Here’s what you need to know to make an informed decision.
First, consider the form of vitamin C used in the supplement. Ascorbic acid is the most common form but can cause digestive upset, especially in high doses. Sodium ascorbate and calcium ascorbate (Ester-C) are buffered forms that are much gentler on the stomach and often better absorbed. If your dog has a sensitive stomach, opt for a buffered form to minimize the risk of loose stools or diarrhea.
The delivery method matters for consistent supplementation. Powders offer the highest potency and can be easily mixed into food, but they require measuring. Liquid supplements absorb quickly and work well for dogs who refuse everything else. Chewable tablets are the most convenient for daily use and often include supporting nutrients. Choose the format that your dog will accept willingly, since consistency is key to seeing results.
Look for supporting ingredients that enhance vitamin C’s effectiveness. Bioflavonoids help vitamin C absorb more effectively, while vitamin E works synergistically with vitamin C to provide enhanced antioxidant protection. Zinc and selenium add additional immune support. Products that combine vitamin C with these complementary nutrients offer more comprehensive protection than vitamin C alone.
Consult your veterinarian before starting supplementation. While vitamin C is water-soluble and excess is typically excreted in urine, high doses can increase the risk of forming certain types of bladder stones in some dogs. Your vet can recommend the right dose and form based on your dog’s specific health needs, existing diet, and any medications they’re taking.
Benefits of Vitamin C Supplements for Dogs
Vitamin C provides numerous health benefits for dogs, even though they can produce it naturally. During times of stress, illness, or aging, supplementation can provide a valuable boost to your dog’s health.
The most well-known benefit of vitamin C is its powerful antioxidant activity. As one of the body’s primary water-soluble antioxidants, vitamin C neutralizes free radicals before they can damage cells, proteins, and DNA. This protection is especially important during times of oxidative stress, such as during illness, intense exercise, or exposure to environmental toxins. Regular supplementation can help maintain your dog’s cellular health and reduce inflammation throughout the body.
Vitamin C is essential for collagen synthesis, the structural protein that maintains healthy skin, joints, tendons, ligaments, and blood vessels. This makes it particularly beneficial for aging dogs who may experience joint stiffness, as well as active dogs who need strong connective tissue to support their physical demands. Collagen also plays a key role in wound healing, so vitamin C supplementation can support recovery after surgery or injury.
The immune-boosting properties of vitamin C are significant. It supports multiple cellular functions of both the innate and adaptive immune systems, helping your dog’s body fight off infections more effectively. Additionally, vitamin C assists in iron absorption, supports cardiovascular health, and may help improve cognitive function in senior dogs. For working dogs, show dogs, and dogs under stress, the benefits of vitamin C supplementation can be particularly noticeable.
Frequently Asked Questions
Do dogs really need vitamin C supplements if they make their own?
Dogs can synthesize vitamin C in their livers, but their production may not always meet their needs. Stress, illness, aging, intense exercise, and certain health conditions can deplete vitamin C levels faster than the body can replenish them. In these situations, supplementation can provide meaningful support for immune function, joint health, and overall well-being.
What’s the best form of vitamin C for dogs?
Buffered forms like sodium ascorbate and calcium ascorbate (Ester-C) are generally considered the best options for dogs because they’re gentler on the stomach and better absorbed. Regular ascorbic acid works well for many dogs but may cause digestive upset at higher doses. Your vet can recommend the best form based on your dog’s individual needs.
Can vitamin C cause kidney stones in dogs?
High doses of vitamin C can increase the risk of calcium oxalate bladder stones in predisposed dogs. Breeds like Miniature Schnauzers, Bichon Frises, and Shih Tzus may be at higher risk. Always consult your veterinarian about appropriate dosing, especially if your dog has a history of urinary issues.
How much vitamin C should I give my dog daily?
General guidelines suggest about 18mg of vitamin C per pound of body weight, but the appropriate dose depends on your dog’s specific needs and health status. Dogs under stress or recovering from illness may benefit from higher doses. Always follow your vet’s recommendations to avoid over-supplementation.
Can I give my dog human vitamin C tablets?
While the vitamin C itself is the same, human tablets may contain sweeteners, coatings, or other ingredients that aren’t safe for dogs. Some contain xylitol, which is toxic to dogs. It’s safer to use veterinary-specific products or pure vitamin C powder without additives.
When is the best time to give my dog vitamin C?
Vitamin C can be given at any time of day, but administering it with meals can help reduce the risk of stomach upset and improve absorption. If your dog takes multiple supplements, spacing them throughout the day can help maximize absorption of each individual nutrient.
How long does it take to see results from vitamin C supplementation?
Most pet owners notice improvements in energy levels and overall vitality within two to four weeks of consistent daily supplementation. Skin and coat improvements may take four to eight weeks, while immune benefits build gradually over time. Consistency is key to seeing meaningful results.
