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Learn More

5 Best Vitamin C Supplements for Dogs

By: Justin Palmer
Justin Palmer is a Certified Pet Food Nutrition Specialist and co-founder of iHeartDogs.com. Inspired by his rescued husky, Splash, he dedicated himself to learning about extending both the length and quality of her life. Splash lived and thrived until 18 years old, and now Justin is on a mission to share what he learned with other dog owners.Read more
| February 27, 2025

Vitamin C is widely known for its immune-boosting properties in humans, but it also plays an important role in canine health. While dogs can naturally produce Vitamin C in their bodies, certain factors such as stress, illness, or aging can deplete their reserves, leaving them in need of additional support. Supplementing with Vitamin C can help strengthen your dog’s immune system, support joint health, and promote overall well-being.

Incorporating Vitamin C into your dog’s routine can be beneficial for dogs recovering from illness, experiencing joint issues, or dealing with high levels of stress. This powerful antioxidant helps combat inflammation, supports collagen production, and enhances your dog’s ability to fight off infections. With so many options available, understanding the benefits and selecting the right supplement for your dog’s specific needs is essential.

If you’re considering adding a Vitamin C supplement to your dog’s diet, learning how it supports their health can help you make the best choice for their long-term well-being.

best vitamin c supplements for dog

Related: Best Eye Supplements for Dogs

#1 – (BEST OVERALL) Wholistic Pet Organics Allergy Immune Boost: Vitamin C for Dogs Skin and Coat Supplement

Wholistic Pet Organics Allergy Immune Boost is a natural supplement for dogs made with organic ingredients. Its non-acidic form of Vitamin C helps support dogs’ immune systems and provides itch relief for dogs with allergies. The powder can be easily added to dogs’ food and comes with a 100% satisfaction guarantee.





#2 – (BEST ON A BUDGET) Dr. Goodpet Crystal C – Highest Purity Buffered Vitamin C Powder

Dr. Goodpet Crystal C is a high-quality vitamin C powder designed to support the immune system and improve overall health. It is 100% organic and helps fight gum disease and gingivitis while aiding in essential bodily functions.



Related: The Best Supplements for Puppies (+1 to Avoid)


#3 – Rx Vitamins Bio-C Vitamin C Immune Support for Pets

This product is a powdered vitamin C supplement for dogs and cats that aims to boost their immune system. It also helps with detoxification and elimination and can easily be sprinkled over their food for daily use. The supplement is made with premium ingredients and is recommended by veterinarians.





#4- Nutrition Strength Vitamin C for Dogs to Support Cardiovascular Health

Nutrition Strength’s Vitamin C for Dogs is a highly rated supplement designed to support cardiovascular health, boost immune defenses, enhance antioxidant function and maintain collagen synthesis in dogs of all ages, shapes and sizes. Made in the USA with high quality ingredients and meeting strict animal supplement manufacturing guidelines, this human-grade supplement comes with a 365-day money-back guarantee to ensure customer satisfaction.





#5 – PetLab Co. 13 in 1 Dog Multivitamin

PetLab Co. 13 in 1 Dog Multivitamin is a chewable pork flavored supplement that is packed with 13 essential vitamins and minerals that support the immune system, skin, coat, and joints of dogs. The product is made using high-quality ingredients and is exclusively manufactured in the USA. Customers can subscribe and save for long-term results.





Related: Best Skin & Coat Supplements for Dogs


What Are the Benefits of Vitamin C for Dogs?

Vitamin C plays a crucial role in the overall health and well-being of dogs. It is a potent antioxidant that helps mitigate the harmful effects of free radicals in the body, thereby playing a significant role in disease prevention.

  1. Immune Function: Vitamin C is known to boost the immune system function. A strong immune system is crucial for a dog’s overall health and longevity.
  2. Stress Management: Dogs produce Vitamin C naturally in their bodies, but in times of stress, their bodies may need extra Vitamin C. Stressful situations may include vaccinations, illness, or any significant change in their daily routine.
  3. Joint Health: Vitamin C helps produce collagen, a protein that helps in maintaining the health of joints and connective tissues.
  4. Liver Health: Vitamin C has been shown to be beneficial for liver health in dogs. It helps in the detoxification process and aids in reducing the inflammation in the liver.

What Scientific Studies Have Been Done on Vitamin C Supplements for Dogs?

Scientific research has backed some of these benefits. For example, a 2015 study published in the Journal of Veterinary Internal Medicine found that Vitamin C supplementation could be beneficial for dogs with bleeding disorders due to its role in enhancing collagen synthesis, which is essential for blood vessel integrity.

Additionally, a 2007 study in the American Journal of Veterinary Research suggested a potential role for Vitamin C in managing dogs with inflammation and oxidative stress-related conditions, citing its antioxidative properties.

However, it’s important to note that while studies have shown potential benefits, more extensive research is needed to definitively establish the role of Vitamin C supplements in dogs’ health. Furthermore, excessive supplementation can lead to side effects, including diarrhea and gastrointestinal discomfort, which is why it is essential to consult a veterinarian before introducing any new supplement to your dog’s diet.

Related: Best Urinary, Kidney, & Bladder Supplements for Dogs

Supporting Your Dog’s Health with Vitamin C

Providing your dog with the right nutrients is key to maintaining their overall health, and Vitamin C can play an important role in immune function, joint health, and recovery from stress or illness. While some dogs may naturally produce enough Vitamin C, others may benefit from supplementation to help them stay strong and healthy.

Before introducing any new supplement, consult your veterinarian to ensure the proper dosage and suitability for your dog’s specific needs. With the right approach, you can help your furry friend enjoy a healthier, more active life while ensuring they get the essential nutrients they need.

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