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.

The Formulas

MYOS Canine Formula

MYOS Canine Muscle Formula with Fortetropin from egg yolk protein, clinically proven to enhance muscle growth and limit age-related muscle loss (sarcopenia).

VET ONLY

Canine Muscle Formula - Vet Strength Formula

MYOS Canine Vet Strength (with BCAAs)

A cutting-edge, all-natural, steroid-free formula built to support optimal muscle health and strength in dogs of all sizes. Clinically proven to help build muscle and prevent muscle loss, it aids recovery and overall well-being.

Ideal for aging dogs at risk of muscle atrophy, post-surgical and post-injury recovery, and dogs needing improved endurance and mobility. Beyond muscle, the active ingredients also support cognitive, vision, bone and skin health.

Formulated from 100% fertilised chicken egg yolk — free from chicken components, making it suitable for dogs with allergies to other poultry products.

VET ONLY

MYOS Feline Muscle & Joint Formula (with GLM)

A clinical-grade nutritional powder incorporating Green Lipped Mussel, designed to help combat age-related muscle loss (sarcopenia) and support joint health in cats.

Muscle loss matters in cats too: studies link declining muscle mass with age, and lower body weight at CKD diagnosis is associated with markedly higher mortality risk. A University of Florida study (ACVIM Forum, 2021) found Fortetropin safe and well tolerated in cats, with no greater frequency of mild adverse events than placebo.

VET ONLY

MYOS Muscle Formula PLUS

Our 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.

Why Stock MYOS in Your Clinic

Evidence-Based: Real, published clinical trials — not just marketing claims. Randomised, double-blind, placebo-controlled studies across multiple species.
Fills a Genuine Gap: A dedicated tool for muscle loss, post-op recovery and geriatric mobility — addressing an area most clinics have nothing else to offer.
One Tub, Two Problems: MYOS PLUS combines muscle and joint support in a single formula — a compelling, convenient solution for the patients who need it most.
Safe & Clean: Steroid-free, all-natural, GMP-manufactured, and NASC member. Confidence to recommend without reservation.
Profitable Dispensing Line: Healthy in-clinic margin at RRP on every formula — a dispensing line your clinic can recommend and benefit from.