Feline Kidney Care, Made Clear

Launched in 2024, the Greycoat Kidney Program has provided
over 2,000 one-on-one consultations with cat guardians.
From Stage 1 to Stage 3, we've helped guardians care for their CKD cats
with a clear, structured plan.
“Am I really doing the right thing?”
If that question feels familiar, now may be the time to begin.

Start Your Routine with AIM →

Powered by AIM-Based Science

AIM is a natural protein that plays a key role in clearing waste from the body. When it doesn’t function properly, the kidneys may begin to struggle.
Greycoat’s Dr. Toru Protocol is built on this insight— developed from the research of Dr. Toru Miyazaki, who discovered AIM.
Today, that same science can support your cat’s daily care.

Learn More About AIM →

Before & After on the Greycoat Program

These are real cases where the Greycoat Program was applied—especially in Stage 2 and 3 cats, when guardians were searching for a better way forward.
Take a look and see what parts of their journey might help shape your own routine.

See More Greycoat Case Stories →
  • [Stage 2] Ellie – CREA 2.01 → 1.37

    [Stage 2] Ellie – CREA 2.01 → 1.37

    All of Ellie's kidney levels improved considerably. Her creatinine fell from 2.01 to 1.37, her BUN from 35.7 to 30, and her SDMA from 26.9 to 13, indicating that she...

    [Stage 2] Ellie – CREA 2.01 → 1.37

    All of Ellie's kidney levels improved considerably. Her creatinine fell from 2.01 to 1.37, her BUN from 35.7 to 30, and her SDMA from 26.9 to 13, indicating that she...

  • [Stage 3] Napoleon - BUN 43 → 35

    [Stage 3] Napoleon - BUN 43 → 35

    Napoleon, a 14-year-old cat with Stage 3 CKD, showed significant improvement in creatinine and BUN levels after 5 months on the Greycoat Full Spectrum Care Set.His weight remained stable, appetite...

    [Stage 3] Napoleon - BUN 43 → 35

    Napoleon, a 14-year-old cat with Stage 3 CKD, showed significant improvement in creatinine and BUN levels after 5 months on the Greycoat Full Spectrum Care Set.His weight remained stable, appetite...

  • [Stage 2] Naro - CREA 2.3 → 1.9

    [Stage 2] Naro - CREA 2.3 → 1.9

    Despite his age and multiple chronic conditions, Naro’s health has noticeably stabilized since starting the Dr. Toru Protocol.His kidney values have remained steady for over a year—which, for us, is...

    [Stage 2] Naro - CREA 2.3 → 1.9

    Despite his age and multiple chronic conditions, Naro’s health has noticeably stabilized since starting the Dr. Toru Protocol.His kidney values have remained steady for over a year—which, for us, is...

  • [Stage 2] Rocky - BUN 30 → 23

    [Stage 2] Rocky - BUN 30 → 23

    NAME: Rocky Roo HOME: Idaho, USA DATE of Birth: April.1.2016 (9 years old) Condition: Stage 2  Today, we received some heartwarming news from peaceful Idaho, USA. Most cats with stage 2...

    [Stage 2] Rocky - BUN 30 → 23

    NAME: Rocky Roo HOME: Idaho, USA DATE of Birth: April.1.2016 (9 years old) Condition: Stage 2  Today, we received some heartwarming news from peaceful Idaho, USA. Most cats with stage 2...

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Stage 1 CKD Program

At least 66% of kidney function remains.
Stage 1 CKD is not normal. Kidney damage has already begun.
The earlier you start care, the more kidney cells you can preserve.

  • AIM-based supplements
  • Senior diet
  • Daily hydration support
Explore the CKD Stage 1 Guide →

Stage 2 CKD Program

Approximately 33–66% of kidney function remains.
Now is the turning point for your cat’s renal care.
You need to begin renal management to prevent further decline.

  • Stage 2 Tailored Supplements
  • Renal diet
  • Active hydration support
Explore the CKD Stage 2 Guide →

Stage 3 CKD Program

Approximately 15–33% of kidney function remains.
Do not consider euthanasia. There is still hope.
But you must respond quickly and precisely.

  • Stage 3 Tailored Supplements
  • Renal diet and assisted feeding
  • Subcutaneous fluids
  • Electrolyte management
  • Complication management
  • Emergency checks
Explore the CKD Stage 3 Guide →

Led by Pioneers in Kidney Science

The Greycoat Program is grounded in AIM-based science—led by global experts who shaped this field:

  • Dr. Toru Miyazaki

    Dr. Toru Miyazaki

    Founder of the Institute for AIM Medicine and discoverer of the immune protein AIM—his research laid the foundation for the Dr. Toru Protocol.

    Dr. Toru Miyazaki

    Founder of the Institute for AIM Medicine and discoverer of the immune protein AIM—his research laid the foundation for the Dr. Toru Protocol.

  • Dr. Kobayashi Motoo

    Dr. Kobayashi Motoo

    Director of Seijo Kobayashi Animal Hospital (Tokyo) with over 30 years of clinical experience—the first veterinarian to apply AIM science to feline kidney care.

    Dr. Kobayashi Motoo

    Director of Seijo Kobayashi Animal Hospital (Tokyo) with over 30 years of clinical experience—the first veterinarian to apply AIM science to feline kidney care.

  • Dr. Kim Jae-young

    Dr. Kim Jae-young

    Korean longevity expert and veterinarian with 30+ years of experience—guardian of Mingki, a cat who lived to age 28.

    Dr. Kim Jae-young

    Korean longevity expert and veterinarian with 30+ years of experience—guardian of Mingki, a cat who lived to age 28.

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Need help creating a plan?

Start with a free 1:1 consultation—we’ll guide you every step of the way.

Start Free Consultation →

Tackling Complex CKD Cases with Greycoat

Greycoat supports both guardians and veterinarians in complex situations.
From lab interpretation to supplement planning and hydration scheduling, we help you find the next best step—together.

For Veterinarians – When Clinical Decisions Get Complex

We share case-tested strategies with clinical teams:

  • Medication combinations
  • Supplement timing
  • Sub-Q hydration routines
  • Nutritional support options
Learn About Our Vet Consultations →

For Guardians – When Routines Stop Working

When lab values worsen or complications appear, your cat may need a different plan.
Greycoat offers personalized 1:1 consultations.
We help you reset, adapt, and move forward with confidence.

Get Personalized Consultation →

Complete Your Kidney Care Routine

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Our mission is to stop feline kidney disease

— Greycoat Research

Subscribe to the Exclusive Greycoat Program

Get expert-backed kidney care insights—delivered weekly to your inbox.

  • Weekly Updates – trusted tips on lab trends, hydration routines, and dietary care
  • Exclusive Guides – insights into kidney disease, anemia, HCM, and pancreatitis
  • CKD ChatGPT – early access to our personalized AI care tool, launching soon
  • Case-Based Advice – real-world learnings from over 2,000 1:1 consultations

Start caring with confidence and stay one step ahead in your cat’s kidney journey.

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