Contact Us By mail: Dr. Muscle 300-4200, St-Laurent Montreal (PQ) H2W 2R2 Canada By phone: +1 (514) 608-1057. Our lines are open Monday to Friday, 1:00 to 5:00 pm (Eastern Time). By email: support@drmuscleapp.com christelle@drmuscleapp.com mack@drmuscleapp.com carl@drmuscleapp.com We usually reply in one business day.