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The connection & love we share with our cats is boundless. But as our cats age it can become heartbreaking to see and care for them as they struggle with muscle loss. This is the reason we created MYOS Feline Muscle Formula. 


  • Simple. Natural. Proven. MYOS uses a single, all-natural ingredient called Fortetropin®. No additives or artificial ingredients. Fortetropin® has been shown in multiple clinical studies to accelerate gains in muscle mass, improve mobility and enhance recovery from injury.
  • 100% Safe. Not only is MYOS safe for your cat, but it’s safe for you too. We wouldn’t feed our cats something that we wouldn’t be willing to eat ourselves.
  • Worth Every Penny (Or Your Money Back). All MYOS Feline products come with a 100% satisfaction guarantee. Just contact us if for any reason you’re not happy with your purchase and we'll be sure to make it right.


MYOS Feline Muscle Formula

  • Fortetropin® is a unique formula derived from fertilized chicken egg yolks. Our patented process preserves the biological integrity and bio-activity of nutrients in egg yolks. Fortetropin is considered a natural myostatin-reducing agent.

    Our scientists have developed a patented process to harness the immense power of fertilized egg yolk – one of nature’s most nutrient-dense substances!

    The resulting ingredient is Fortetropin®.

  • Completed Research


    Kansas State University: Fortetropin resulted in decreased Liverpool Osteoarthritis in Dogs’ (LOAD) scores in geriatric dogs. 


    Kansas State University:  Fortetropin® prevented atrophy of disuse and improved recovery from TPLO surgery.


    University of Tampa:  Fortetropin acts by upregulating mTOR pathway (promoting muscle growth), downregulating Ubiquitin pathway (slowing muscle degradation), and lowering myostatin levels (promoting muscle growth). 


    University of Florida: Safety and tolerability in healthy cats. 


    Animal Medical Center, NYC:  Impact of Fortetropin on serum myostatin concentration in dogs. 


    University of California, Berkeley: Fortetropin increased rate of muscle protein synthesis by 18% in older adults. 


    McMaster University: In a study involving the unilateral leg immobilization model in young men, Fortetropin supplementation prevented a rise in serum myostatin levels. 





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