MYOS Canine Muscle Formula is an all-natural product, derived from fertilized egg yolk, that is clinically proven to improve canine muscle health, mobility, and recovery from injuries. Fortetropin® is a revolutionary ingredient made through a patented process that maintains the powerful and vital nutrients of Fertilized Egg Yolk. These unique egg yolks are all-natural and have complex molecules that have been clinically proven to increase muscle size and mass. Our Vet Strength Formula is available exclusively to veterinarians. This advanced supplement is powered by Fortetropin® and contains additional branched-chain amino acids (BCCA's) for added muscle support.