Hello, I’m Alex Shin, a pharmacist at Greycoat Research.

Greycoat Research has conducted approximately 5,000 consultations involving cats with CKD. During these consultations, we sometimes see cats receiving beta-glucan for kidney or immune support.

The reasons are usually similar:

• “Beta-glucan supports the immune system.”
• “Beta-glucan provides antioxidant support.”

These claims make beta-glucan sound like an obvious choice. But a stronger immune response is not always better.

Extra caution is needed when a cat has stomatitis, takes steroids, or has another immune-sensitive condition. Greycoat Research does not recommend long-term, high-dose beta-glucan for these cats.

A Case from Our Consultations

This case involved a cat in Korea with Stage 2 CKD and chronic stomatitis. The cat was taking steroids to control the stomatitis while also receiving a high dose of beta-glucan for immune support. One part of the routine was intended to reduce excessive immune activity.

The other was intended to stimulate the immune system. We did not believe these two approaches were aligned. We recommended removing beta-glucan and focusing instead on quercetin, curcumin, and inflammation management.

After the change, the cat’s stomatitis gradually stabilized. As the condition stabilized, the veterinarian was able to reduce the steroid dose. The cat has since remained stable and maintained a better quality of life.

This does not mean every cat will respond in the same way. But the lesson is clear. The entire care plan should move in one consistent direction.

Ingredients should not be selected by name alone. The cat’s condition, medications, and treatment plan must all be considered.

Not All Beta-Glucans Are the Same

This email focuses on yeast- and mushroom-derived beta-glucans used for immune support. Beta-glucan from oats and other grains is mainly used as soluble fiber.

The name may be the same, but the structure and purpose are different. Certain yeast- and mushroom-derived beta-glucans can activate immune cells. Their effects vary depending on the source, structure, solubility, and dose. Beta-glucan is not just an antioxidant. It can actively influence the immune system. This may be useful in some situations.

But it may be the wrong direction when immune activity is already excessive or poorly controlled. Cats with Stomatitis Do Not Simply Need “Stronger Immunity” Chronic stomatitis is not simply a disease of weak immunity.

It is often linked to excessive or poorly controlled immune activity. This is one reason steroids and other immune-modulating medications may be used.

These medications help reduce excessive immune and inflammatory responses. The key issue is not a proven direct interaction between beta-glucan and steroids. The key issue is whether the entire care plan is moving in the same direction.

Using steroids to lower immune activity while giving high-dose beta-glucan to stimulate it is not a consistent strategy.

Greycoat Research does not recommend high-dose beta-glucan for cats with severe stomatitis or cats currently taking steroids.

Do not reduce or stop prescribed steroids without your veterinarian’s guidance.

Inflammation Also Matters in Cats with CKD

CKD is not only about elevated kidney values. Inflammation and fibrosis are common in the kidneys of cats with CKD. These changes are closely connected to the gradual loss of kidney function.

The main concern is not that beta-glucan is directly toxic to the kidneys.
The more important question is:

“Is an ingredient that affects the immune system right for my cat’s current condition?”

Cats with CKD often have several health problems at the same time.

These may include inflammation, poor appetite, digestive problems, stomatitis, and other conditions. They may also take several medications and supplements together.

High-dose beta-glucan should not be added simply because a label says it supports the kidneys or strengthens immunity.

There is not enough evidence to support the long-term use of high-dose beta-glucan to slow CKD progression or extend survival in cats.

Greycoat Research does not support the long-term, high-dose use of beta-glucan when the purpose is unclear and the evidence is limited.

Review Beta-Glucan Use in These Situations

Review your cat’s beta-glucan use now if any of the following apply:

• Your cat has stomatitis or another immune-related condition.
• Your cat is taking steroids or other medications that suppress the immune system.
• Your cat has been taking high-dose beta-glucan for a long time.
• You do not know the exact source or daily dose.
• More than one supplement contains beta-glucan.
• Your cat’s condition worsened after starting beta-glucan or increasing the dose.

First, check the source and exact daily amount. Then ask why your cat is taking it.
When necessary, discuss reducing or stopping it with your veterinarian.

For some cats, focusing on inflammation management may be more appropriate than trying to strengthen the immune system.

Why Greycoat Removed Beta-Glucan

An earlier version of Greycoat Intensive contained beta-glucan, but only at a very low dose. Our goal was to retain its possible benefits while minimizing unnecessary immune stimulation. We did not observe any clear pattern of problems during real-world use. But we continued to evaluate the formula.

For about two years, we reviewed real-world feeding information and customer consultation records. We concluded that focusing on inflammation management with curcumin and quercetin was a better fit for the purpose of Greycoat Intensive.

The renewed Greycoat Intensive no longer contains beta-glucan. The formula now places greater emphasis on curcumin, quercetin, and inflammation-focused support.

Adding more ingredients is not always progress. A longer ingredient list does not make a better product. We remove ingredients that do not clearly support the purpose of the formula. We place greater emphasis on ingredients that better fit that purpose. We consider removing beta-glucan an improvement, not a step backward.

Greycoat Research continues to improve its products using real-world feeding information and consultation data.

Beta-Glucan Is Not a Miracle Ingredient

This content is provided for general educational and informational purposes only.
It is not intended as a substitute for professional veterinary advice, diagnosis, or treatment, nor is it intended to diagnose, treat, cure, or prevent any disease.
Please consult your veterinarian regarding your cat’s health and before making any changes to your cat’s diet, supplements, or care routine.

Beta-glucan is not harmful to every cat. But it is not right for every cat.

For cats with immune-sensitive conditions, the words “immune support” may be a reason for caution, not a benefit. Ingredients should be selected based on the cat’s current condition, not their popularity.

Sometimes removing the wrong ingredient matters more than adding another one.
Beta-glucan is no exception.

If your cat is currently taking beta-glucan, check three things today:

• The exact source.
• The daily dose.
• Whether your cat is taking steroids.

If you are unsure whether beta-glucan is appropriate for your cat, discuss it with your veterinarian in the context of your cat’s overall treatment plan.

Thank you,
Alex Shin
Pharmacist
Greycoat Research

[Educational Disclaimer]

This content is provided for general educational and informational purposes only.
It is not intended as a substitute for professional veterinary advice, diagnosis, or treatment, nor is it intended to diagnose, treat, cure, or prevent any disease.
Please consult your veterinarian regarding your cat’s health and before making any changes to your cat’s diet, supplements, or care routine.