What’s the Difference in Immune Supplements? — Comparing Beta-Glucan, Colostrum, and Probiotics

ImmunityComparisonsMeongsiljang Veterinary Advisory Board

We compare the five key ingredients in immune-supporting supplements for dogs and cats based on their efficacy, safety, and recommended dosage. We’ve also summarized the criteria for choosing the right supplement for your pet at a glance.

What Are Immune Supplements? Roles Vary by Ingredient

A comparison of immune-supporting supplements for dogs and cats by type

Pet immune supplements are designed to support gut health and immune function. What truly matters is the specific ingredients they contain, as different formulations can have varying effects. Probiotics, for instance, consist of live microorganisms that help regulate intestinal immunity and maintain the homeostasis of gut mucosal cells. While other ingredients like beta-glucans or colostrum are often marketed for stimulating innate immunity or providing antibodies, their efficacy can vary depending on the product and individual pet, so it’s best to view them as supportive rather than definitive solutions. Choosing ingredients suited to your pet’s specific needs and consulting with your veterinarian before starting supplementation will help ensure you get the best possible results.

When Immune Supplements Are Needed

Immune-supporting supplements aren’t essential for every pet. However, you may consider adding them as a dietary supplement in the following situations: - Seasonal dips in well-being: When coughing, runny nose, or eye discharge become more frequent - Entering senior years: Dogs aged 7 and older, cats aged 10 and older - Recurrent digestive issues: When soft stools or diarrhea occur repeatedly - After surgery or antibiotic treatment: When restoring gut health is needed - Allergies or skin problems: When balancing immune function is necessary Please note: If your pet is currently being treated for an acute illness, always consult your veterinarian before giving any supplements.

Five Key Ingredients in Immune Supplements

Safe

베타글루칸(Beta-Glucan)

대식세포·NK세포 활성화로 선천면역 강화

Dosage: 체중 1kg당 2~10mg/일

수의면역학 교과서 수록

Safe

콜로스트럼(Colostrum)

IgG 항체·락토페린으로 점막 면역 지원

Dosage: 체중 5kg 기준 500~1000mg/일

유제품 알레르기 시 주의

Safe

프로바이오틱스(Probiotics)

장내 유익균 증식으로 장 면역 70% 담당 영역 강화

Dosage: 1억~50억 CFU/일

면역저하 시 균주 선택 주의

Caution

비타민E(Vitamin E)

항산화·T세포 기능 유지

Dosage: 체중 1kg당 1~2 IU/일

과량 시 혈액응고 저해 가능

Safe

오메가3(Omega-3 EPA/DHA)

염증 조절·면역 균형 유지

Dosage: 체중 1kg당 EPA+DHA 30~50mg/일

고용량 시 지혈 영향

At-a-Glance Comparison by Ingredient

Item	Beta-Glucan	Colostrum	Probiotics	Vitamin E	Omega-3
Main Action	Stimulates innate immunity	Supplies antibodies	Gut immunity	Antioxidant	Regulates inflammation
Suitable for Dogs	True	True	True	True	True
Suitable for Cats	True	True	True	True	True
Recommended for Senior Age	True	False	True	True	True
For Gut Trouble	False	True	True	False	False
Allergy Support	True	False	True	False	True
Safety	Generally on the safe side	Caution if sensitive to dairy	Generally on the safe side	Caution with overdose	Caution with high doses

※ Among the actions of each ingredient in the table, aside from the gut immune-regulating role of probiotics, efficacy and safety may vary by individual and product. Always consult a veterinarian before actual administration, and check for ingredient overlap in combination products.

What to Check Before Choosing an Immune Supplement

The goal of immune-support supplements is to maintain immune balance, not simply to “boost” immunity. In pets being treated for autoimmune diseases such as lupus or pemphigus, giving ingredients that stimulate the immune system (e.g., beta-glucan or colostrum) can actually worsen the condition. If your pet is taking steroids or other immunosuppressive medications, or has been diagnosed with an immune-related disease such as lymphoma, always consult your veterinarian before starting any supplement.

Recommended Ingredient Combinations by Situation

The right combination depends on your pet’s individual needs.

Seasonal immune support: Beta-glucan + Vitamin E

Sensitive digestive system: Probiotics + Colostrum

Comprehensive senior care: Beta-glucan + Omega-3 + Vitamin E

Allergies and itching: Omega-3 + Probiotics

Post-surgical recovery: Colostrum + Probiotics

When choosing a multi-ingredient product, it’s better to select one that contains two to three targeted ingredients at appropriate dosages rather than a formula packed with five or more components.

Immune supplement ingredient combinations for dogs and cats by situation

How to Read the Label — Checking Content and CFU

When purchasing an immune-support supplement, be sure to check three key items on the label.

Active ingredient content: The label should specify the amount in milligrams (mg), not just state "contains beta-glucan." If no specific number is provided, the actual content is likely minimal.

Probiotic CFU count: This refers to the "Colony Forming Unit" value. Also check whether the guaranteed viable count is specified at the time of manufacture or at the expiration date.

Other ingredients and sweeteners: Xylitol is absolutely toxic to dogs and must be avoided. Also steer clear of products containing high levels of artificial flavors and colors.

How to check the ingredient label of an immune supplement

Note on Ingredient Differences Between Dogs and Cats

You should not give products intended for dogs to cats without modification. Cats require taurine as an essential nutrient and are particularly sensitive to certain herbs and essential oils due to their unique liver metabolism. Conversely, dogs must strictly avoid xylitol and grape extracts. Avoid products labeled only as "for pets" without specifying the target species, and always choose products clearly marked as "for dogs only," "for cats only," or "for both dogs and cats."

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

When is the best time to start giving an immune-supporting supplement?

For healthy adult dogs and cats, it’s not strictly necessary. However, you may consider supplementing their diet during seasonal changes, stressful situations (such as moving or after hospitalization), or when they enter their senior years at age 7 and beyond. Always consult your veterinarian before making any decisions if your pet is undergoing treatment for an acute illness.

Is it safe to give multiple ingredients at once?

Most immune-supporting supplements can be given together without significant issues. However, if multiple ingredients are administered simultaneously at high doses, care should be taken to ensure that the safe dosage for each individual ingredient is not exceeded. Especially during sensitive periods, such as before and after surgery, inform your veterinarian about all the supplements you are currently giving and confirm whether they should continue. If you are already using a combination product, also check for any overlapping ingredients to avoid duplicate intake.

How long does it take for the effects to appear?

Immune supplements are not medications but supportive aids, so they don’t produce immediate effects. Ingredients that directly influence the gut microbiome, such as probiotics, may show relatively quick responses compared to other components. However, the time it takes for each ingredient to take effect varies depending on individual differences, health status, and dosage. Therefore, it’s best to consistently administer the supplement for several weeks to months while monitoring for changes.

Is it safe to give additional immune-support supplements if the pet food already contains immune-boosting ingredients?

The nutrient levels in pet food are designed to meet basic dietary needs, so they may not be sufficient for therapeutic or management purposes. To avoid excessive intake from overlapping sources, review both the supplement ingredients and the pet food label, and adjust the dosage in consultation with your veterinarian.

Can I give my pet immune-supporting supplements if they have an autoimmune disease?

Immune-stimulating ingredients, such as beta-glucan and colostrum, are contraindicated because they can exacerbate autoimmune diseases. On the other hand, immune-modulating and balancing ingredients like omega-3 fatty acids and probiotics may be beneficial depending on the situation, but you should always follow the guidance of your attending veterinarian.

Primary vs. Secondary Veterinary Hospitals: A Comparison

Comparing Dog Vaccine Types (3-way, 5-way, 7-way): Differences and How to Choose

Pet Insurance Enrollment Timing Comparison: When Is the Most Advantageous Time to Enroll?

Comparison of Dental Supplements and Chews

Liver Supplements: SAMe vs. Silymarin vs. UDCA — Which Is Right for Your Pet?

Small-Breed vs. Large-Breed Dog Food Costs — How Much Does the Monthly Cost Differ by Body Size?

Pet Hotel Rating Comparison Guide — From Premium to Basic

At-Home Grooming vs. Professional Salon: Comparing Costs and Care Burdens to Choose the Best Option for Your Dog

Perfect Comparison of Nutritional Differences Between Dogs and Cats

Persian vs. Himalayan — Personality, Health, and Care: Which Cat Is Right for Your Home?

References

[1] Tizard, I.R., Veterinary Immunology, 11th Edition, Elsevier, 2023

[2] Fascetti, A.J. & Delaney, S.J., Applied Veterinary Clinical Nutrition, 2nd Edition, Wiley-Blackwell, 2023

[3] Mora, J.R., Iwata, M., von Andrian, U.H., Vitamin effects on the immune system: vitamins A and D take centre stage, Nat. Rev. Immunol. 8, 685–698, 2008

[4] Chattha, K.S. et al., Vitamin A deficiency impairs adaptive B and T cell responses, PLoS One 8, e82966, 2013

What’s the Difference in Immune Supplements? — Comparing Beta-Glucan, Colostrum, and Probiotics

What Are Immune Supplements? Roles Vary by Ingredient

When Immune Supplements Are Needed

Five Key Ingredients in Immune Supplements

베타글루칸(Beta-Glucan)

콜로스트럼(Colostrum)

프로바이오틱스(Probiotics)

비타민E(Vitamin E)

오메가3(Omega-3 EPA/DHA)

At-a-Glance Comparison by Ingredient

Recommended Ingredient Combinations by Situation

How to Read the Label — Checking Content and CFU

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Frequently Asked Questions

Related Guides

References