
Cellular Rest Support for Kidney & Heart Wellness
Kidney and heart cells work all day long and they too need rest.
A simple daily routine to support cellular health in cats facing daily kidney and heart challenges.
📌NOTICE: Customs duties for U.S. customers are covered by Greycoat Research.
Why Cellular Rest Matters
Kidney and heart cells work tirelessly around the clock.
For long-term wellness, these cells also need support for rest.
Cellular rest is linked with three essential areas:
- Energy Balance – sustaining daily vitality
- Waste Processing – helping the body manage natural byproducts
- Stress Regulation – helping the body return to calm
Research has highlighted three pathways—AMPK, Autophagy, and Cortisol balance—as important for maintaining stability in kidney and heart cells.
How It Works
- AMPK
Sometimes called the “energy sensor” of the cell, AMPK is studied for its role in maintaining cellular energy balance. - Autophagy
The body’s natural recycling process, involved in managing and renewing cellular components. - Cortisol
The primary stress hormone. Adequate rest is associated with healthier cortisol balance, supporting calm and stability.
👉 Together, these mechanisms may support energy balance, byproduct management, and stress regulation, which are factors that contribute to overall kidney and heart wellness.
Who It’s For
Greycoat Calm is recommended for cats who:
- Are 7 years or older with reduced activity
- Need ongoing kidney or heart care support
- Experience stress from daily subcutaneous fluids
Inside the Formula
13 active ingredients studied for cellular rest
Key Actives
- Barberry Fruit Extract (contains Berberine)
Contains berberine, a compound studied for its connection to AMPK pathways and cellular energy support.Ref: Ai Y, et al. Berberine: A Review of its Pharmacokinetics Properties. Front Pharmacol. 2021 - Blueberry Extract (contains Pterostilbene)
Contains pterostilbene, researched for antioxidant activity and potential AMPK support.Ref: Liu L, et al. Pterostilbene in the Treatment of Inflammatory and Chronic Diseases. Front Pharmacol. 2023 - Tomato Extract (contains Melatonin)
Contains melatonin, investigated for its potential role in autophagy regulation and cellular recovery.Ref: Luo Z, et al. Melatonin and Autophagy in Aging-Related Diseases. Int J Mol Sci. 2020
Full Formula
Barberry fruit extract, Blueberry extract, Tomato extract, Chamomile extract, Taurine, GABA, Theanine, Strawberry extract, Milk Thistle, Vitamin C, Vitamin B6, Quercetin, Resveratrol
Cat Stories & Reviews
How to Use
When to Give
- 1 capsule daily, in the evening, before bed
How to Give
- Capsule form is recommended, as some actives may taste bitter.
- A pill gun can reduce stress for both guardian and cat.
Tips
- Place a small amount of liquid treat on the pill gun tip.
- Follow immediately with a treat to help the capsule go down smoothly.
About Greycoat Research
Greycoat Research develops supplements focused on kidney and heart wellness in cats.
- Backed by 3,000+ 1:1 consultations and 10,000+ cats supported
- Formulas use only internationally recognized safe ingredients
- Strict dosage verification and data-driven quality control
Advisory Note
All formulas are reviewed by veterinarians, pharmacists, and researchers:
- Collaborating Experts: Dr. Motoo Kobayashi, Alex Shin (Pharm.D)
- Special Advisory in Kidney & Heart Care: Dr. Jae-Young Kim (DVM)
A Note to Guardians
Caring for a cat with kidney or heart concerns takes daily effort.
Over time, both guardians and cats may feel worn down.
A simple routine, just one capsule a day, can become part of a supportive care plan for greater comfort and stability.
Safety Promise
- No preservatives, artificial colors, or flavors
- Reviewed by veterinarians, pharmacists, and researchers
- Formulated only with globally recognized safe ingredients
FAQ
Q. Can I give this with other supplements?
A. In most cases, yes. If your cat is already on high-dose antioxidants or specialty compounds, we recommend a consultation.
Q. How many capsules per day?
A. The standard recommendation is 1 capsule daily. Please consult if adjustments seem necessary.
Q. What if my cat resists capsules?
A. Use a pill gun with a small amount of liquid treat, followed by a reward treat. This often makes swallowing smoother.
Q. When can I expect results?
A. Experiences vary. Some guardians have observed supportive changes in their cat’s comfort or routine within 2–4 weeks.
Start the Routine
Begin your cat’s cellular rest routine today.
One capsule a day can become part of a supportive care plan for greater comfort and stability.
Give your cat the daily support their kidneys and heart need.
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Produktdetails
- Product Name: Greycoat Calm
- Contents: 60 capsules
- Ingredients: Taurine, GABA, Microcrystalline Cellulose, Milk Thistle, L-Theanine, Berberine Extract, Blueberry Extract, Vitamin C, Bromelain, Strawberry Extract, Tomato Extract, Chamomile Extract, Quercetin, Resveratrol, Vitamin
- Form: Capsule
- Feeding Duration:
→ 1 capsule per day regardless of weight: 1 bottle lasts approx. 2 months - Country of Manufacture: South Korea
- Storage: Store in a cool, dry place away from direct sunlight
Our mission is to advance feline kidney health.
— Greycoat Research
Greycoat Calm

FAQ
Can I give this with other supplements?
The standard recommendation is 1 capsule daily. Please consult if adjustments seem necessary.
How many capsules per day?
No. It contains milk thistle to support liver health and can be given safely without burdening the kidneys.
What if my cat resists capsules?
Use a pill gun with a small amount of liquid treat, followed by a reward treat. This often makes swallowing smoother.
When can I expect results?
Experiences vary. Some guardians have observed supportive changes in their cat’s comfort or routine within 2–4 weeks.