We independently evaluate all of our recommendations. If you click on links we provide, we may receive compensation. The 8 Best Cat Supplements, According to Real Cats By Theresa Holland Theresa Holland Theresa Holland is a product reviewer for The Spruce Pets who specializes in writing about pets, personal finance, home improvement, wellness, and travel. She is also the creator of the blog The Taboo Textbook, where she shares her favorite life hacks. Learn more about The Spruce Pets' Editorial Process Updated on 01/03/25 In This Article View All In This Article Top Picks Reviews How We Found the Best Supplements for Cats What to Look For in Cat Supplements FAQ Why Trust The Spruce Pets Credit: The Spruce Pets / Amelia Manley At some point in their lives, most cats will struggle with itchy skin, bouts of diarrhea, upper respiratory issues, joint pain, or other ailments. A nutritional supplement for a cat can enhance their overall well-being while helping to address issues, alleviate symptoms, and minimize their discomfort. Nevertheless, we recommend checking with a vet before introducing anything new to your cat's diet, especially since some dietary supplements for pets make exaggerated claims about their efficacy. To find the best cat supplements, we began with detailed feedback from over a dozen households with cats, asking them to evaluate their cat's supplements—ease of use and desired effect on their cat's health—which provided a strong basis for further research. We looked in particular for supplement brands that work with industry-leading third-party organizations, like the National Animal Supplements Council (NASC), to ensure their products are safe for pet consumption. While we found a lot of great options to meet a variety of feline needs and preferences, our favorite cat supplement is The Missing Link's Superfood Powders Feline Wellbeing Supplement, which blends healthy fats, phytonutrients, and dietary fiber in an easily delivered powder form. Top Picks Best Overall: The Missing Link Feline Wellbeing Supplement at Amazon $19 Jump to Review Best Probiotics: Purina Pro Plan FortiFlora for Cats at Amazon $31 Jump to Review Best for Skin and Coat: Zesty Paws Wild Alaskan Salmon Oil at Amazon $16 Jump to Review Best for Joints: Nutramax Cosequin Joint Health Supplement for Cats at Amazon $22 Jump to Review Best for Seniors: VetriScience Laboratories Senior MultiVitamin at Amazon $10 Jump to Review Best for Immune Support: Tomlyn L-Lysine Immune Support at Amazon $21 Jump to Review Best Meal Topper: Fera Pets Multivitamin Topper for Cats and Dogs at Amazon $30 Jump to Review Best Lickable: Zesty Paws Digestion Cat Mousse Squeeze Supplement at Amazon $20 Jump to Review Best Overall The Missing Link Feline Wellbeing Supplement Credit: The Missing Link $19 at Amazon $19 at Chewy View on Missinglinkproducts.com What We Like Supports skin, coat, digestion, and immunity Adds savory flavor to food NASC-certified Packaged in resealable bag What We Don't Like More challenging to mix in with dry food Rich in omega-3 and omega-6 fatty acids, dietary fiber, and phytonutrients to support skin and coat health, proper digestion, and immunity, this supplement is easy to add to a cat's normal food, and has been independently tested and NASC-certified. It's made with flaxseed, beef liver, dried kelp, barley grass, and alfalfa meal for a well-rounded dose of protein, fat, fibrous carbs, vitamins, and minerals—manufactured in the United States in a facility registered with the Food and Drug Administration (FDA) to produce products for animal consumption. Depending on your cat's weight, you'll give them up to 1 teaspoon of Superfood Powders Feline Wellbeing Supplement per day. The flavor is described as savory or meaty, but there are some cats that do not like the added flavor to their food. It's more likely to be consumed if the powder is cohesively mixed in, so if your cat eats kibble you should try to lightly moisten the powder with a spray bottle to make it a little sticky. NASC Quality Seal: Yes | Type: Powder | Benefits: Skin, coat, digestion, immunity Best Probiotics Purina Pro Plan FortiFlora for Cats Credit: Amazon $31 at Amazon $31 at Chewy View on PetSmart What We Like Helps restore gut balance after diarrhea Provides probiotics and antioxidants Pre-measured packets are easy to use What We Don't Like Adds liver flavor to food that not all cats enjoy For cats struggling with diarrhea, Purina Pro Plan Veterinary Formula FortiFlora for Felines is our top recommendation to help alleviate symptoms and restore balance to their digestive system. From our survey, the majority of the cat parents found this product to be reliable, effective, and easy to administer with each daily dose individually packaged in a sachet to preserve the potency. There is no need to measure; simply tear open a packet and sprinkle it on top of a cat's regular food. Your cat will ingest live probiotics—a healthy strain of bacteria known as Enterococcus faecium—to promote intestinal health. Other ingredients include brewer's yeast, vitamin C, zinc, manganese, calcium, and taurine. This Purina supplement was developed by scientists, veterinarians, and nutritionists in the United States specifically for cats. NASC Quality Seal: Yes | Type: Powder | Benefits: Digestion, immunity Best for Skin and Coat Zesty Paws Wild Alaskan Salmon Oil Credit: Amazon $16 at Amazon View on Chewy $15 at Target What We Like Helps skin retain moisture to alleviate dryness Free of GMOs Fish oil from wild-caught Alaskan salmon No artificial flavors, artificial preservatives, or synthetic colors Suitable for dogs and cats What We Don't Like Has a fishy odor that tends to linger if spilled The Wild Alaskan Salmon Oil from Zesty Paws is rich in omega-3 fatty acids, including EPA and DHA, which are naturally found in fish. For cats, adding 1 or 2 teaspoons of the oil to their food can help their skin retain moisture, alleviating dryness and bringing about a healthier coat. Zesty Paws derives its fish oil from wild salmon caught in the Alaskan Bering Sea, and it is free of GMOs, artificial flavors, artificial preservatives, and synthetic colors. Suitable for dogs and cats, the recommended serving is based on the animal's weight. Most cats enjoy the flavor, but the oil retains the fishy smell of salmon which will linger if spilled, so use caution when pouring (we learned from experience). NASC Quality Seal: Yes | Type: Oil | Benefits: Skin, coat Best for Joints Nutramax Cosequin Joint Health Supplement for Cats Credit: Courtesy by Amazon $22 at Amazon $20 at Chewy What We Like Provides glucosamine and chondroitin for joint and muscle health Capsule or soft chew format Also beneficial for some bladder issues What We Don't Like Omega-3 fatty acids only added to soft chew version If your feline has arthritis or other joint issues, we recommend Nutramax's Cosequin Supplement for Cats, which contains a blend of glucosamine, manganese, and chondroitin sulfate to help produce cartilage and protect bones. Cosequin for Cats can also improve bladder health by protecting the lining of the bladder wall. Depending on your cat's weight, a daily dose will be one or two capsules that are easy to open and sprinkle onto your cat's food. Nutramax also offers a soft chew version of the Cosequin Supplement for Cats with the added benefits of omega-3 fatty acids for coat and skin health, but not all cats view the chew as a treat, so it might be more difficult to get them to eat the supplement in that form. All of Nutramax's supplements for pets are made in the United States where the company implements strict guidelines and rigorous testing, but the company does not partner with the NASC. NASC Quality Seal: No | Type: Capsule or soft chew | Benefits: Joints, muscles, bladder Best for Seniors VetriScience Laboratories Senior MultiVitamin Credit: Courtesy by Amazon $10 $9 at Amazon View on Chewy What We Like Fish flavored Provides antioxidants, amino acids, fish oil omegas, and B vitamins Formulated to maintain immune, heart, liver, eye, and brain health What We Don't Like Only available as a soft chew When your feline friend reaches their senior stage (around 11 years of age), you might start noticing issues related to vision, mobility, and respiratory health. VertriScience Nu Cat Senior Multivitamin is formulated to support whole-body health (immune, heart, liver, eye, and brain) in senior house cats. Each bite-sized chew is fish-flavored and made with nutrient-rich ingredients including salmon oil, safflower oil, taurine, lysine, oat flour, and rye flour to provide healthy fats, whole-grain fiber, and amino acids. This daily supplement also contains calcium, vitamin D, magnesium, zinc, vitamin B12, vitamin A, folic acid, and biotin. NASC Quality Seal: Yes | Type: Soft chews | Benefits: Skin, coat, ocular, joint, muscles, Best for Immune Support Tomlyn L-Lysine Immune Support Credit: Tomlyn Immune Support $21 at Amazon $21 at Chewy $30 $25 at Petco What We Like Chicken and fish flavored Supports eye, respiratory, and immune system health Sprinkle on top of regular food What We Don't Like Some humans don't like the smell Each serving of Tomyln L-Lysine Immune Support for Cats provides 500 milligrams of Lysine, an essential amino acid, to help your cat's immune system stay strong and benefit eye and respiratory health. Following a bout of recurring pink eye infections (conjunctivitis), one survey participant's cat's eyes remained infection-free for over three years after consuming a scoop of this supplement for two meals per day. While not all cats will have a similar experience, this supplement might help alleviate some discomfort your cat is experiencing. For cats six months or older, the recommended daily dose is one scoop two times per day added to dry or wet food—starting with half a scoop or less to slowly introduce the supplement. Although most cats find the chicken and fish-flavored powder enjoyable, Tomyln also offers this supplement as a daily fish-flavored soft chew—all made in the United States and have the NASC quality seal. NASC Quality Seal: Yes | Type: Powder or soft chew | Benefits: Immunity, ocular, respiratory Best Meal Topper Fera Pets Multivitamin Topper for Cats and Dogs Credit: Fera Pets $30 at Amazon View on Chewy View on Petco What We Like Resealable and recyclable pouches Provides vitamins, minerals, and probiotics Adds cheesy flavor and scent to food Suitable for dogs and cats What We Don't Like Not suitable for cats with a goat milk allergy Fera Pets Multivitamin Goat Milk Topper is easy to add to your cat's favorite food. The powdery supplement's main ingredient is nutrient-rich goat milk, which adds a cheesy smell and flavor along with vitamins, minerals, and probiotics. A daily serving for cats up to 25 pounds is 1 teaspoon, and the topper is packaged in a resealable bag. The Multivitamin Goat Milk Topper is beneficial for most cats (and dogs), but Fera Pets also offers a Hip & Joint Goat Milk Meal Topper with glucosamine and MSM, a Skin & Coat Goat Milk Topper with collagen, biotin, and vitamin C, an Immune Goat Milk Meal Topper colostrum and temperature-stable probiotics, and a Calm Goat Milk Meal Topper with ashwagandha and L-theanine. The goat's milk is sourced from the Netherlands from grass-fed goats raised without GMOs, antibiotics, or growth hormones. NASC Quality Seal: Yes | Type: Powder | Benefits: Immunity, digestion Best Lickable Zesty Paws Digestion Cat Mousse Squeeze Supplement Credit: Chewy $20 at Amazon $20 at Chewy What We Like Limited ingredients Dietary fiber, omega-3 and omega-6 fatty acids, and antioxidants from seaweed No artificial colors, flavors, or preservatives Flaxseed oil for healthy skin and coat What We Don't Like Nine calories per treat This lickable treat from Zesty Paws provides an easy, tasty way to add some essential nutrients to support their digestion, skin and coat health, and cellular function. The limited ingredients include dried seaweed—a key source of dietary fiber, omega-3 and omega-6 fatty acids, and antioxidants to aid digestion and immunity—and flaxseed oil for healthy skin and coat. We also like that chicken broth and chicken (or fish broth and tuna) are the first ingredients, plus there are no artificial colors, flavors, or preservatives. The creamy "mousse-like" texture makes it appealing to cats either as a reward treat or a meal topper, and convenient for pet parents to dispense. While it's fairly high in calories, at nine per tube, it offers a great option for picky cats who are not good eaters, or who are recovering from an illness or have stomach issues. Some cat parents even use it to mask the bitter taste of pills or mix it with water to boost hydration. NASC Quality Seal: Yes | Type: Mousse | Benefits: Digestion, immunity, skin, coat Final Verdict If you're looking for a high-quality supplement that supports whole-body health, your best bet is The Missing Link The Original Superfood Supplement for Cats. The powdered formula is full of healthy fats, phytonutrients, and dietary fiber. That said, if you have a senior cat at home, you might want to select something formulated specifically for older felines, like VetriScience Laboratories Nu Cat Senior MultiVitamin, which has essential amino acids and omega-3s, plus a blend of vitamins and minerals. How We Found the Best Supplements for Cats Veterinary products can be difficult to independently test, so we instead rely on our wide pool of testers and product experts for feedback about their experience with medications, supplements, and other veterinary products. Most recently, our research team created a comprehensive survey to gather consistent data across multiple households about preferred supplements for cats. This survey of more than 15 cats (their owners did the answering) provided us insights into each cat's age, weight, and other factors that helped us select the best supplements for any variety of cats. We asked about which supplements were used in each household and how often, gathering data on benefits, consistency, and preferred brands. Finally, we also asked each cat owner to provide numerical ratings and detailed feedback for their chosen supplements, scoring for ease of use, effectiveness, and value. We also consulted with multiple expert sources, both while developing our survey and for additional insights into how to best use supplements for cats. What to Look For in Cat Supplements NASC Certification There are a number of organizations dedicated to vetting products created for animals and we recommend checking the product you select for your can for the National Animal Supplement Council (NASC) seal of approval. To place the NASC seal on product packaging, companies must have strict quality controls and a system in place to monitor products in production. These supplement manufacturers are required to submit to random testing and meet strict labeling guidelines. Ingredients Look for products that clearly list out all ingredients and if you aren't familiar with an ingredient, do some research before you give the supplement to your cat. In general, products for pets that are manufactured in the United States are required to disclose the ingredients that are included, but that doesn't always apply to products from international manufacturers. We recommend steering clear of supplements that contain fillers, artificial flavors, colors, or preservatives, and looking for information on where ingredients were sourced. For example, Zesty Paws supplements clearly state that their products contain no artificial flavors, preservatives, or synthetic colors. The products are made in the United States with locally and globally sourced ingredients. Flavor & Appeal After your vet has recommended a supplement for your cat, finding one that your kitty will ingest regularly is paramount to reaping the benefits. Many supplements can be added to food, and some are flavored to make them more appealing to a cat. If adding to a treat or food, make sure to check their bowl or feeding area to confirm your cat actually consumed the supplement and didn't simply eat around it. FAQ Do all cats need supplements? No. Always check with your veterinarian before introducing a supplement to your cat. With your vet's guidance, you can pinpoint which supplement is the most beneficial for your cat's current needs. Do cat supplements help with arthritis? Potentially, but check with your veterinarian first before giving your cat a supplement for arthritis. Studies have shown that cats with arthritis may benefit from taking a supplement with glucosamine, chondroitin, and methylsulfonylmethane (MSM) to reduce joint pain and inflammation. Can cats take supplements made for humans? No, do not give your cat supplements made for humans as they may contain ingredients that are harmful to cats. Consult with your veterinarian to find the supplements best suited for your cat. Why Trust The Spruce Pets This article was written by Theresa Holland, a professional writer, animal lover, and former pet owner with extensive experience covering cat and dog products. You can read more of her work on The Spruce, MyDomaine, and Byrdie. The 11 Best Wet Cat Foods of 2026 Explore more: What to Buy Cat Products Cat Food