The most comprehensive formula — muscle and joint support in one tub. Built for aging pets, active breeds, and patients recovering from surgery or injury.

Three complementary ingredients:

• Fortetropin — enhances protein synthesis and maintains healthy muscle mass, reducing muscle loss from aging, injury or inactivity.
• Green Lipped Mussel — a natural source of Omega-3 fatty acids to help reduce inflammation and stiffness, with Glycosaminoglycans (GAGs) that support joint flexibility and comfort. Especially valuable for arthritic patients.
• Eggshell Membrane — delivers collagen, glucosamine and hyaluronic acid to support joint elasticity, connective tissue and skin health.

Free from fillers and artificial additives, PLUS offers a genuinely holistic approach to canine wellness — helping dogs of all ages stay strong, mobile and comfortable.

Muscle Loss Is Behind More Cases Than You Think

Sarcopenia (age-related muscle loss), post-surgical atrophy, and reduced mobility in arthritic patients all share a common thread: loss of lean muscle. Muscle isn't just about strength — it underpins mobility, recovery, metabolic health and longevity. Yet it's one of the few areas most clinics have no dedicated product to address.

MYOS closes that gap with Fortetropin — a clinically-studied, all-natural ingredient with a clear mechanism of action and real trial data behind it.

How Fortetropin Works
Fortetropin is a bioactive protein made from fertilised chicken egg yolk using a patented, high-pressure pasteurised process. It works by reducing circulating myostatin — the body's signal to break muscle down — while supporting the pathways that build muscle up (upregulating mTOR activity and downregulating the ubiquitin-proteasome breakdown pathway).

The result: muscle is preserved and rebuilt more efficiently, supporting recovery, mobility and vitality.

The Clinical Evidence

• Post-Operative Muscle Protection - In a randomised, double-blind, placebo-controlled study of 100 dogs recovering from TPLO surgery, daily Fortetropin significantly reduced muscle atrophy compared with a macronutrient-matched placebo.
• Improved Mobility in Geriatric Dogs - In a randomised, double-blind, placebo-controlled study of 45 geriatric dogs, daily Fortetropin produced statistically significant improvements in mobility and quality of life, measured by reductions in Liverpool Osteoarthritis in Dogs (LOAD) scores.
• Increased Muscle Protein Synthesis - In a randomised, double-blind, placebo-controlled human study of older adults (60–75 years), daily Fortetropin increased the rate of muscle protein synthesis by roughly 18% versus placebo.
• Safe & All Natural - Steroid-free, free from fillers and artificial additives, and sourced from fertilised chicken egg yolk.
• Good Manufacturing Practice - MYOS adheres to Good Manufacturing Practice (GMP) standards for consistent quality and safety across all their products.
• NASC Member - MYOS is a member of the NASC (National Animal Supplement Council), committed to providing health supplements of the highest quality for companion animals.