Clinical Trial Readiness to Solve Barriers to Drug Development in FSHD

Inclusion Criteria: * Patients with genetically confirmed FSHD1 or clinical diagnosis of FSHD with characteristic findings on exam and an affected parent or offspring * Patients with symptomatic limb weakness * Patients must be able to walk 30 feet without the support of another person or assistance (canes, walking sticks, and braces allowed; no walker). * If taking over the counter supplements, willing to remain consistent with supplement regimen throughout the course of the study Exclusion Criteria: * Patients with cardiac or respiratory dysfunction (deemed clinically unstable, or would interfere with safe testing, in the opinion of the Investigator) * Patients with orthopedic conditions that preclude safe testing of muscle function * Patients that regularly use available muscle anabolic/catabolic agents such as corticosteroids, oral testosterone or derivatives, or oral beta agonists * Patients that have used an experimental drug in an FSHD clinical trial within the past 30 days * Patients that are pregnant