--- product_id: 49872293 title: "Dr. Bill’s Feline Immune Support | Boosts Cat Immunity and Health with Colostrum, Beta Glucan, Turkey Tail Mushroom, Zinc & Vitamin C | Powder Supplement for Cats of All Ages" brand: "dr. bill's" price: "€ 39.96" currency: EUR in_stock: true reviews_count: 8 category: "Dr. Bill's" url: https://www.desertcart.hr/products/49872293-dr-bill-s-feline-immune-support-boosts-cat-immunity-health store_origin: HR region: Croatia --- # Nrf2 antioxidants for cellular defense Turkey Tail Mushroom for gut & allergy support Clinically studied immune boosters Dr. Bill’s Feline Immune Support | Boosts Cat Immunity and Health with Colostrum, Beta Glucan, Turkey Tail Mushroom, Zinc & Vitamin C | Powder Supplement for Cats of All Ages **Brand:** dr. bill's **Price:** € 39.96 **Availability:** ✅ In Stock ## Summary > 🐾 Fortify your feline’s future with every scoop! ## Quick Answers - **What is this?** Dr. Bill’s Feline Immune Support | Boosts Cat Immunity and Health with Colostrum, Beta Glucan, Turkey Tail Mushroom, Zinc & Vitamin C | Powder Supplement for Cats of All Ages by dr. bill's - **How much does it cost?** € 39.96 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/49872293-dr-bill-s-feline-immune-support-boosts-cat-immunity-health) ## Best For - dr. bill's enthusiasts ## Why This Product - Trusted dr. bill's brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Rapid Recovery Boost:** Colostrum & Echinacea accelerate healing and reduce inflammation for faster bounce-back from illness. - • **All-Age Immune Shield:** Daily immune support tailored for kittens, adults & seniors to keep your cat thriving year-round. - • **Cellular Defense Formula:** Vitamin C, Zinc & Nrf2 activators neutralize free radicals to protect your cat’s cells from oxidative stress. - • **Science-Backed Natural Power:** Clinically proven Beta Glucan & Turkey Tail Mushroom enhance immune resilience and gut health. - • **Veterinarian-Trusted Quality:** Formulated by Dr. Bill Barnett with 40+ years expertise, made in the USA with premium, safe ingredients. ## Overview Dr. Bill’s Feline Immune Support is a premium powder supplement designed for cats of all ages, combining clinically studied ingredients like Beta Glucan, Turkey Tail Mushroom, Colostrum, Vitamin C, and Zinc. This veterinarian-formulated blend supports immune health, cellular protection, and faster recovery, helping your cat stay resilient against illness and environmental stressors. Made in the USA with trusted quality, it’s the daily boost every cat deserves. ## Description Made in the United States All Dr. Bill’s Supplements are made in the United States under strict quality standards. Veterinarian Developed Dr. Bill is an established pet nutrition expert and has been developing products since 1982. His years of experience ensure that safety, efficacy, and palatability are built into each supplement. Human-Grade Ingredients Our supplements are made with high-quality, natural ingredients that are biologically appropriate for the cat and dog to provide proactive nutritional support for a variety of health concerns. Made in the United States All Dr. Bill’s Supplements are made in the United States under strict quality standards. Veterinarian Developed Dr. Bill is an established pet nutrition expert and has been developing products since 1982. His years of experience ensure that safety, efficacy, and palatability are built into each supplement. Human-Grade Ingredients Our supplements are made with high-quality, natural ingredients that are biologically appropriate for the cat and dog to provide proactive nutritional support for a variety of health concerns. Is there a real Dr. Bill? YES! He is one of America’s most famous animal nutrition researchers. Dr. Bill developed products for many of the top brands of dog food but ultimately grew frustrated by their insistence on profit over quality. Dr. Bill is passionate about maximizing the health and longevity of dogs so he started his own line of dog supplements prioritizing proven research and searching for the best ingredients in the world. Is there a real Dr. Bill? YES! He is one of America’s most famous animal nutrition researchers. Dr. Bill developed products for many of the top brands of dog food but ultimately grew frustrated by their insistence on profit over quality. Dr. Bill is passionate about maximizing the health and longevity of dogs so he started his own line of dog supplements prioritizing proven research and searching for the best ingredients in the world. Dr. Bill's Canine Products Visit the Store Dr. Bill's Canine Products Visit the Store Dr. Bill's Feline Products Visit the Store Dr. Bill's Feline Products Review: Good stuff - We bought a brand spanking new kitty and this was one of the things that was suggested that we give him on the daily. It is supposed to help boost his immune system and keep him alive and healthy. Let’s hope it works. At any rate he really likes it? Review: Great product - Over the years this item has saved the lives of several of my cats. I highly recommend it for your companion animals. ## Features - Supports a Strong, Resilient Immune System: Helps your cat fight off illness, recover faster, and stay healthy year-round with proactive daily immune support. Ideal for kittens, adults, and senior cats. - Backed by Science, Powered by Nature: Features clinically studied ingredients like Beta Glucan and Turkey Tail Mushroom to strengthen immune cells, support gut health, health defense, even environmental and seasonal allergies. - Protects at the Cellular Level: Nrf2 Antioxidant Activators, Vitamin C, and Zinc help neutralize harmful free radicals, reduce oxidative stress, and support healthy cellular function for long-term wellness. - Promotes Faster Recovery & Response: Colostrum, Echinacea, and other immune-boosting compounds aid T-cell activity and reduce inflammation, helping your cat bounce back quicker from everyday immune challenges. - Veterinarian-Formulated & Made in the USA: Developed by Dr. Bill Barnett, one of America’s top animal health experts with 40+ years of experience. Crafted in the USA with premium ingredients for purity, safety, and results you can trust. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B075HCGDXL | | Active Ingredients | Colostrum, Echinacea, Beta 1,3/1,6 Glucan, Turkey Tail Mushrooms, Nrf2 Antioxidant Activators, Vitamin C & Zinc Active Ingredients Colostrum, Echinacea, Beta 1,3/1,6 Glucan, Turkey Tail Mushrooms, Nrf2 Antioxidant Activators, Vitamin C & Zinc See more | | Best Sellers Rank | #30,883 in Pet Supplies ( See Top 100 in Pet Supplies ) #10 in Cat Antioxidant Supplements | | Brand | Dr. Bill's | | Brand Name | Dr. Bill's | | Customer Reviews | 4.2 out of 5 stars 497 Reviews | | Flavor | Bacon | | Included Components | Scoop | | Item Form | Powder | | Item Weight | 60 Grams | | Manufacturer | Dr. Bill's | | Manufacturer Part Number | DB-FIS-60- UPC | | Pet Type | Cat | | Product Benefits | Immune Health | Immune Response | Cellular Protection | A Strong, Healthy Life | | Specific Uses For Product | Health Defense, Improving Cellular Health, Nrf2 Antioxidant Activation, Reducing Oxidative Stress, The Innate Immune System | | Target Species | Cat | | UPC | 859765007027 | | Unit Count | 60.00 Grams | ## Product Details - **Brand:** Dr. Bill's - **Flavor:** Bacon - **Item Form:** Powder - **Item Weight:** 60 Grams ## Images ![Dr. Bill’s Feline Immune Support | Boosts Cat Immunity and Health with Colostrum, Beta Glucan, Turkey Tail Mushroom, Zinc & Vitamin C | Powder Supplement for Cats of All Ages - Image 1](https://m.media-amazon.com/images/I/71nwpIDxAGL.jpg) ![Dr. Bill’s Feline Immune Support | Boosts Cat Immunity and Health with Colostrum, Beta Glucan, Turkey Tail Mushroom, Zinc & Vitamin C | Powder Supplement for Cats of All Ages - Image 2](https://m.media-amazon.com/images/I/81c22GHvKWL.jpg) ![Dr. Bill’s Feline Immune Support | Boosts Cat Immunity and Health with Colostrum, Beta Glucan, Turkey Tail Mushroom, Zinc & Vitamin C | Powder Supplement for Cats of All Ages - Image 3](https://m.media-amazon.com/images/I/81UPmyuX24L.jpg) ![Dr. Bill’s Feline Immune Support | Boosts Cat Immunity and Health with Colostrum, Beta Glucan, Turkey Tail Mushroom, Zinc & Vitamin C | Powder Supplement for Cats of All Ages - Image 4](https://m.media-amazon.com/images/I/8109-jJ8s2L.jpg) ![Dr. Bill’s Feline Immune Support | Boosts Cat Immunity and Health with Colostrum, Beta Glucan, Turkey Tail Mushroom, Zinc & Vitamin C | Powder Supplement for Cats of All Ages - Image 5](https://m.media-amazon.com/images/I/81fR-Kz+yTL.jpg) ## Available Options This product comes in different **Style** options. ## Questions & Answers **Q: Why is there so much arginine in the product? My herpes cat needs support but Im afraid to give it to him as arginine triggers the virus.** A: Hello - Thank you for your question. We include Arginine in Feline Immune Support because Arginine is the most important essential amino acid required by the adult cat. Arginine detoxifies ammonia, which results from the breakdown of proteins. It also has an important function in the urea cycle. If a cat goes without Arginine for very long, even a few hours, it will die. The daily requirement is set at 2,600 mg/day for the average size cat. Arginine is an essential amino acid, which means that it must come from their diet as they cannot produce it internally. Dr. Bill's The Feline Immune Support provides 29.06 mg of arginine/scoop or about 1.12% of the daily needs, as cats will also receive arginine in a healthy diet. The best sources of arginine: 1. Nuts and seeds. Seeds and nuts are high in arginine. Nuts and seeds are significant sources of arginine. 2. Meat products. Meat is a complete source of protein because it includes all of the amino acids the body requires, including arginine. 3. Legumes. Chickpeas are a great source of protein and provide plenty of arginine. Legumes are a family that includes beans, peas, and pulses. 4. Seaweed. Seaweed is a popular health food that provides high levels of arginine. A cup of dried seaweed contains 4.645 g of the amino acid. You can see why wild cats prefer to hunt for animal source protein (red meat) since nuts, legumes and seaweed were not likely available sources. Pet foods today may provide some red meat, but the most likely outcome is that most cats eating dry food or wet foods using seafood entrees or chicken need supplemental arginine in order to thrive. Research shows that while it is true that Arginine has been shown to be required in the formation of herpesvirus capsid protein, most studies recommend NOT reducing arginine in the cat because it is so essential for health. Any correlation between maintaining normal arginine levels and the triggering of herpesvirus has not been shown. Let us know if you have any further questions! Dr. Bill Barnett **Q: I have always ordered health defense and ordered immune by mistake. cab it be returned if opened but not used?** A: I would ask Amazon; being it was opened... **Q: How many mg of lactoferrin is in this? And is it bovine lactoferrin?** A: There are 3.63 mg lactoferrin in every 630 mg level scoop. Yes, it is bovine lactoferrin. **Q: Can this help cats heal from Stomatitis?** A: Feline Immune Support is designed to boost the innate immune system, which may help the body fight off the primary causes of stomatitis such as viruses, bacteria or periodontal disease. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good stuff *by J***N on January 2, 2026* We bought a brand spanking new kitty and this was one of the things that was suggested that we give him on the daily. It is supposed to help boost his immune system and keep him alive and healthy. Let’s hope it works. At any rate he really likes it? ### ⭐⭐⭐⭐⭐ Great product *by K***N on December 2, 2025* Over the years this item has saved the lives of several of my cats. I highly recommend it for your companion animals. ### ⭐⭐⭐⭐⭐ Helping my cat. *by J***Y on October 19, 2025* My cat loves the flavour and it's really helped him. He's stopped over grooming, his hair is growing back and he's much happier and more content. Clearly doing some good. ## Frequently Bought Together - Dr. Bill’s Feline Immune Support | Boosts Cat Immunity and Health with Colostrum, Beta Glucan, Turkey Tail Mushroom, Zinc & Vitamin C | Powder Supplement for Cats of All Ages - Life Extension Cat Mix, cat Food Supplements, Heart Health, probiotics, L-arginine, Taurine, B12, folic Acid, Vitamin C, Vitamin E, Rosemary, Nutrient Absorption, Gluten-Free, Non-GMO, 85 Servings - Zesty Paws Wild Alaskan Omega-3 Blend Pollock + Salmon Oil for Dogs and Cats- Skin and Coat Support, Omega 3 Supplement for Pets, 8.5oz --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/49872293-dr-bill-s-feline-immune-support-boosts-cat-immunity-health](https://www.desertcart.hr/products/49872293-dr-bill-s-feline-immune-support-boosts-cat-immunity-health) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-05-19*