Coenzyme Q10 for Dogs: What Pet Parents Should Know

CoQ10 is a critical component of a dog’s normal energy metabolism. It plays a role in cellular reactions in the mitochondria that help cells make ATP, which is the basic source of energy for cellular function.  

Because of its ability to provide energy to cells, CoQ10 is sometimes recommended to support heart and brain health. Both of these organs use a lot of energy, so providing additional cellular energy should logically have some benefit. 

CoQ10 also has antioxidant activity, meaning it can neutralize the free radicals that cause oxidative damage, which has been linked to many diseases including heart disease.   

Most research involving CoQ10 is focused on heart health and reproduction. Since CoQ10 is involved in energy production, the theory is that it may help increase the amount of energy available to the heart muscle, allowing it to pump more effectively.  

The research results, however, have been mixed. In one study of plasma CoQ10 and related blood markers in dogs with cardiovascular disease, CoQ10 supplementation did not provide reliable benefits. Another study of dogs with the most common forms of canine heart disease, myxomatous mitral value disease and congestive heart failure, found that dogs provided CoQ10 for three months as part of their overall treatment plan had some improvement in blood markers of inflammation. 

CoQ10 has also been studied for its effect on fertility. In three case studies of dogs with poor semen quality, CoQ10 was associated with better sperm motility and fewer abnormal sperm, while other semen measures did not change.  

Studies in dogs also suggest that absorption may be a challenge. One study of Beagles given CoQ10 found poor and slow absorption. This means that the product form may matter more than pet parents expect. 

While there is ample human evidence that CoQ10 can provide some benefits, there is very little direct evidence of benefits in dogs. Because of this, CoQ10 is best given to your dog if your vet recommends it. Most often, vets suggest CoQ10 as a supportive therapy for dogs with heart disease or some other existing disease. 

Published safety data in dogs are reassuring overall. In the Beagle toxicity study, researchers reported normal behavior, blood work, and tissue findings, with no deaths even at high research doses.  

Still, side effects and product-specific issues are possible, especially since supplement formulas can differ. These may include stomach upset or allergic reactions. Tell your veterinarian about all prescription medications, over-the-counter products, and supplements your dog takes before starting CoQ10.  

If your veterinarian recommends CoQ10, be sure to use a dog-appropriate product and follow their instructions regarding dosing and frequency. Don’t assume a supplement meant for humans is a good fit, because formulations can vary and some human supplements may contain extra ingredients that aren’t dog-safe. Also, as the absorption study showed, various products may be absorbed differently in dogs.  

If your dog may have eaten a large amount of CoQ10 or got into a human supplement bottle, call your veterinarian, an emergency hospital, or the Pet Poison Helpline (855-764-7661) right away. Have the package handy so you can relay information about the product and its ingredient list. When in doubt, it’s better to get help quickly than to wait for your dog to develop a problem. 

Is CoQ10 safe for dogs?  

Dog studies suggest CoQ10 is generally well tolerated. A repeated-dose study showed normal behavior, blood chemistry, and histopathology in dogs taking CoQ10. Even so, this doesn’t automatically mean a supplement is the right choice for every dog.   

Does CoQ10 help dogs with heart disease? 

There is some dog research in this area, but results are not strong enough to show a clear, dependable effect. One cardiovascular study looked at CoQ10 and related blood markers in dogs with cardiovascular disease, but it didn’t prove that supplementation provides reliable benefits.  

Can CoQ10 help male fertility in dogs? 

Possibly. Three case studies reported better sperm motility and fewer abnormal sperm in dogs given reduced CoQ10, yet other semen measures did not change. Overall, we can’t yet consider it a proven fertility boost.  

Why do some dog supplements use ubiquinol instead of CoQ10? 

Ubiquinol is the reduced form of CoQ10. It is often marketed as the “active” or more bioavailable form of CoQ10, as it may be absorbed better. 

Should I ask my vet before giving CoQ10? 

Yes. Your vet is the right place to start any time you are considering adding a supplement to your dog’s routine.