Herbal Supplements for Cats: How To Choose Safe Options

Herbal supplements are derived from plants with medicinal or healing properties. They are usually formulated into tinctures, capsules, pills, powders, or topicals that are given to your cat.   

Similar to traditional vitamins and supplements such as vitamin E or glucosamine, herbal supplements are not regulated by the U.S. Food and Drug Administration (FDA). This means it’s even more important to know what you’re giving your cat to ensure it’s safe and high-quality.  

When buying supplements, look for the Quality Seal from the National Animal Supplement Council (NASC). This not-for-profit organization was created to help regulate dietary supplements for animals. The seal guarantees that the manufacturer has high standards when creating the product and that the label is accurate.    

In general, there’s very little research on herbal supplements in cats. Most of what we know comes from research on other species or from anecdotal evidence from pet parents who use herbal products.  

Your vet is a critical partner when it comes to giving your cat any kind of herbal supplement. They can help you understand any possible drug interactions, risks, and dosing.  

Herbal supplements are not without risk, even if they are marketed as “all natural” or “organic.” Cats have unique liver enzymes and may react differently to plant compounds than humans, dogs, or other animals.  

Additionally, because herbs are less regulated than prescription drugs, there’s a risk of product contamination, misleading or incorrect label information for non-NASC products, and interactions with other supplements or drugs (for example, St. John’s wort can alter drug metabolism). 

Just like with people, herbal supplements may be formulated to address common health concerns in cats, or to provide relaxation.  

Herbs are often used to help calm agitated cats or provide enjoyment. However, not every cat responds the same way to herbal products.  

If your vet agrees that herbal supplements are a good option for your cat, it’s a good idea to start with small amounts and watch your cat closely. Keep in mind that some cats will actually become overstimulated on these herbs. 

The two most common enrichment and calming herbs are catnip and silvervine. Catnip is available as a consumable, and it’s also sometimes added to toys and other non-consumable products.  

Allergies and other skin issues are very common among cats, often causing hair loss and itching. The most common herbal supplement used to help reduce itchiness and provide relief for skin conditions is licorice root, which provides support to overactive immune systems.  

However, never use licorice root on your cat without supervision from your vet, especially if your feline has high blood pressure or kidney disease, takes diuretics, or is on corticosteroids. Licorice root contains glycyrrhizin, a compound that can interact with medications and have a profound effect on your cat’s body. 

Herbs may also be recommended to provide support for liver health or help address gastrointestinal (GI) upset. The most common options include:   

• Slippery elm, which contains mucilage, a substance that coats the digestive tract and can help provide soothing relief.  
• Milk thistle (silymarin/silybin), which is used to support liver health. There isn’t a lot of data available on milk thistle, so always talk to your vet before offering this to your cat. 

If you’re considering giving your cat an herbal supplement, talk to your vet to make sure it’s safe and recommended.  

Once you’ve started therapy, monitor closely for side effects. If you see any sudden change in behavior or if your cat starts experiencing symptoms like vomiting, diarrhea, agitation, jaundice (yellowing of the skin), or severe skin reactions or seems extra sleepy, call your vet immediately or seek out emergency veterinary care.  

If you suspect your cat was exposed to a toxin, contact Pet Poison Helpline right away. 

When you’re shopping for herbal supplements for your cat, follow these tips to ensure you’re picking the best products and keeping your cat safe from unwanted side effects: 

• Pick reputable brands. Look for the NASC Quality Seal. 
• Use products that were created for cats. Do not give your cat human or dog supplements (they may be much too strong for the smaller felines).  
• Introduce one change at a time and keep a simple log of dose, timing, and behavior. 
• Never replace prescribed care with herbs without your vet’s guidance. 

Finally, always read and follow label instructions on our vet-approved herbal supplement. 

Some of the most common supplements on the market are technically herbal supplements—but beware! Many of these products are actually toxic for cats and should be completely avoided.  

Herbal supplements to avoid include: 

• Garlic, onions, chives, and leeks (all derived from the Allium genus of plants): These can cause internal damage and result in anemia (low blood cell count).  
• Tea tree and other essential oils: These oils can cause liver damage or neurological harm. 
• Pennyroyal: This herb has been linked to liver damage in cats.  
• St. John’s wort: This popular herb should only be used with veterinary oversight because it interacts with other commonly used medications.  
• Comfrey: This herb may cause liver damage.  

Are herbal supplements safe for cats? 

Some can be, but you should always consult with your vet before giving your cat any herbal supplement. Cats metabolize compounds differently and many herbal products lack rigorous testing. Look for quality markers like the NASC Quality Seal. 

Can I use human herbal products for my cat? 

Products formulated for humans, dogs or other animals should not be given to cats. Human products may contain xylitol, caffeine, or other additives unsafe for cats, and suggested dosages are different because cats are so much smaller. 

How do I know a supplement is high-quality? 

Check for the NASC Quality Seal on the packaging and a certificate of analysis (COA). Buy from reputable brands and retailers and stick to products your vet recommends.  

Can herbs replace prescription meds? 

No. Herbs are never substitutes for prescribed care unless your vet tells you to change their treatment. Stopping medications without veterinary input is risky. 

What should I do if my cat reacts to a supplement? 

Stop the product immediately and call your veterinarian. If you suspect poisoning, contact Pet Poison Helpline.