Out of Stock Only Natural Pet Immune Strengthener Capsules Dog & Cat Supplement, slide 1 of 1

Only Natural Pet Immune Strengthener Capsules Dog & Cat Supplement, 90 count

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Help keep your pal in tip-top shape with the Only Natural Pet Immune Strengthener Capsules Dog & Cat Supplement. Veterinarian-formulated to help support a healthy immune system in cats and dogs, these capsules are packed with medicinal mushrooms, vitamins, herbs and antioxidants to help maintain immunity and fight free radicals—the main cause of wear and tear to cells. That’s why they’re great for all pets as an everyday supplement to support overall wellness, but also for those recovering from illness or injury, and even for very active pets that could use the extra support. To easily give to your pal, simply insert the pill in a pill wrap or open it and mix in the natural turkey-flavored powder with his food.

Key Benefits
  • Veterinarian-formulated synergistic blend of medicinal mushrooms and other nutrients to help support immune health.
  • Works for cats and dogs alike, and is easy to use by inserting in a pill wrap or breaking up the capsule and mixing with food.
  • Contains mushrooms like Reishi and Shiitake, plus herbs like cat’s claw and astralagus—known as adaptogens—plus vitamin A, E, selenium and more.
  • Natural turkey flavor means your pal will actually like the taste and is great for all pets, especially those recovering from injury, disease or surgery.
  • Made in the USA in an FDA-approved facility with carefully selected human-grade ingredients.

For animal use only. Keep out of reach of children and animals. In case of accidental overdose contact a health professional immediately. Safe use in pregnant animals or animals intended for breeding has not been proven. Use with caution on animals with renal disorders. If animal's condition worsens or does not improve, stop product administration and consult your veterinarian. An examination from a veterinarian is recommended prior to using this product.

See all items by Only Natural Pet

  • Item Number
  • Lifestage
    Adult, Senior, Puppy
  • Breed Size
    Small Breeds, Medium Breeds, Large Breeds, All Breeds
  • Food Form
  • Product Form
Nutritional Info

Active Ingredients: Vitamin C (as Ascorbic Acid) 50 mg, Reishi (fruit) Extract 4:1 31.25 mg, Shiitake (fruit) Extract 4:1 31.25 mg, Cat's Claw (bark) Extract 4:1 25 mg, Maitake (fruit) Extract 4:1 25 mg, Astagalus (root) Extract 4:1 12.5 mg, Decaf Green Tea (leaf) Extract 12.5 mg, N-Acetyl-L-Cysteine 5 mg, Coenzyme Q10 2 mg, Selenium (from Selenomethionine) 0.02 mg, Vitamin A (from Vitamin A Acetate) 1000 IU, Vitamin E (from d-alpha Tocopheryl Acid Succinate) 35 IU.

Inactive Ingredients: Gelatin (capsule), Magnesium Stearate, Microcrystalline Cellulose, Natural Turkey Flavor.

Feeding Instructions
Weight of PetDaily Feeding
Under 25 lbs1/2 capsule twice daily
26 - 50 lbs1 capsule twice daily
51 - 100 lbs2 capsules twice daily
Over 100 lbs3 capsules twice daily

Wrap capsule in a treat or break open and mix with moist food or liquid.


Why should I include vitamins & supplements in my pet’s diet?

Most commercial pet foods include baseline vitamins and nutrients, but some may not have the adequate amount to suit your pet’s exact health needs. Like in humans, vitamins and supplements can help support your pet’s long-term health, regulating everything from digestion to muscle growth. Consult your veterinarian to determine the best vitamins and supplements for your furry friend.

How often should I give this supplement to my pet?

It is recommended to give the suggested dosage based off your pet’s weight. Please refer to the Feeding Instructions tab and consult with your veterinarian for more information.

Is this supplement safe to use with the medication my pet is currently taking?

If your pet has a medical condition and is taking other medication, we recommend consulting with your veterinarian to ensure that this supplement is safe to use.

My pet is allergic to certain ingredients, will this product be safe to use?

For a complete list of ingredients, click on the 'Nutritional Info' tab, next to the 'Description' tab, just under the product photos. If you are unsure about the safety of this product for your pet, we recommend consulting with your veterinarian.

Does this product come in other product forms?

For a complete assortment of products by the manufacturer of this supplement, click on the link next to the item name at the top of the page. You can also find an assortment of supplements across all product forms on our page.

Rating: 5.0 of 5 stars 6 Reviews 6 Reviews 5 out of 5 Stars

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  • 5 out of 5 stars

    Amazing Product

    By Goldenn on Jun 26, 2020

    My 1 year old Golden Retriever, got the oral Papilloma Virus inside her gum line. Unfortunately there is no antibiotics prescription to cure this by vet. I ordered this and gave my dog two pills a day, morning and night. Slow process but they started to shrink in size and finally went away!! Highly recommend!!!

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  • 5 out of 5 stars

    Patience as it works after 45 days

    By Mother on Apr 18, 2020

    My 13 year old cardigan corgi has immune problems (NSAID bled out, facial myosis from steroid, arthritis). I was looking for a supplement with vitamin A. He is 45lb and takes one a day on top of his breakfast. He had a 2 inch bare spot on his tail from a spider bite more than a year ago. After 45 days on this product the bare spot is gone. Amazing as nothing else has affected it. No other changes to his diet or supplements.

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  • 5 out of 5 stars

    Great Product!

    By BrodyLab on Jul 8, 2019

    I don’t usually leave reviews, but I wanted to share my experience with these. Long story short, I was told by my vet that my one year old lab has the Papilloma Virus, he has oral warts. They were on his tongue, and a couple on his lip. There are no antibiotics for this virus, I was told that I have to wait for his immune system to get stronger to fight it off. I researched anything else that I can do to speed up the process, and after only a week of giving him these, two a day, I noticed a huge difference. It’s been a slow process, but definitely not taking as long to clear up! And I do believe these vitamins have greatly helped. This morning I can barely see them.

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  • 5 out of 5 stars

    Good ingredients

    By RDBMH on May 15, 2019

    I like these because they have the best ingredients of all other immune supplements. The things I was looking for was vitamin A that's not in beta-carotene form because thats not good for cats. Also, the vitamin E is natural, not synthetic which is the bad form. It doesn't have a bunch of preservatives. I only wish it had L-lysine in the formula.

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  • 5 out of 5 stars

    Kennel cough gone!

    By ChiefsMom on Jan 21, 2019

    My 8 month old pup picked up kennel cough for the first time. I wanted to try & treat him naturally before going the vet/antibiotics route. Gave him 2 pills a day (one in am, one in evening) along with 1 tsp of honey 3 times a day & within 5 days his cough was completely gone!!! I read it can take up to 3 weeks sometimes but he’s completely cough free & was back to his normal self within a few days. I truly feel this product assisted in his swift recovery due to its high antioxidant ingredients! I opened the capsule & mixed with his food along with 1 tbsp warm water & an egg. I will always keep a bottle of this on hand to keep his immune system strong!

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  • 5 out of 5 stars


    By CANS on Aug 29, 2018

    I bought this because my rescue dog has mange. Her hair started growing back while on the product, we thought she was on her way to recovery, all her hair grew back in after 1 bottle/6 weeks. But two weeks without this, she started losing hair in patches again! Ordered more, I really believe this works great!!!

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