Naturopathic Doctor (ND)

Dr. John Dempster, ND is a board certified Naturopathic Doctor and the Founder and of The Dempster Clinic –Center for Functional Medicine.

Dr. Dempster, ND focuses on a Functional Medicine model when treating patients who suffer from various conditions such as mental illness, autoimmune disease, digestive disorders, and more.
In addition, Dr. Dempster, ND has a strong passion for helping patients embrace an optimal aging philosophy, where he supports them in achieving a longer, healthier, and more fulfilling life. By referring to functional medicine testing, his approach emphasizes the importance of optimizing biochemical, metabolic, and hormonal functions within the body.

As a strong believer in integrative and evidence based medicine, Dr. Dempster, ND has also completed an advanced fellowship in Functional, Regenerative, and Anti-Aging Medicine.

Dr. Dempster, ND frequently conducts research on relevant health issues and speaks to corporations about various health and wellness topics.  Dr. Dempster, ND is a sought after speaker and his work is frequently featured on national television and media sites worldwide.

In addition to working with patients at his Toronto-based clinic, Dr. Dempster, ND is also the co-founder of The Mental Wellness Summit, and The Mental Wellness Tribe, one of the world’s largest web-based forums that provides natural solutions and root cause resolution for mental illness.

Dr. Dempster, ND believes in the importance of living a well-balanced life.  He is extremely passionate about the outdoors and is an avid downhill skier, fly fisherman, and white water canoeist.  Dr. Dempster, ND has paddled some of Canada’s most famous Arctic Rivers such as Mountain River, Burnside River, and the Coppermine River.  When not working, Dr. Dempster, ND enjoys spending time with family.

Dr. John Dempster, ND holding his baby on the beach


  • Licensed to practice Naturopathic Medicine in Ontario (CONO)
  • Licensed to practice Parenteral (IV) Therapy in Ontario (CONO)
  • Ontario Association of Naturopathic Doctors, member
  • Canadian Association of Naturopathic Doctors, member
  • Board Certified Fellow in Anti-Aging, Regenerative, and Functional Medicine (FAARFM)
  • Board certified member of The American Board of Anti-Aging Health Practitioners (ABAAHP)
  • Bachelor of Science with Honours, Biological Science, University of Guelph, Ontario, Canada
  • Graduate of Functional Medicine University (FMU)
  • Board Certified Fellow In Anti-Aging, Regenerative, And Functional Medicine (FAARFM)
  • Gluten Free Society Certified Practitioner

Dr. Tamara Kung, ND

Naturopathic Doctor

Dr. Tamara Kung, ND

Dr. Tamara Kung, ND is a licensed naturopathic doctor in the province of Ontario.  Dr. Kung, ND’s goal is to complement and enhance the quality of healthcare for her patients – to bring in the vital, often missing pieces of education and holistic support so her patients can sustain quality longevity.

With a strong focus on nutrition, Dr. Kung, ND helps patients break down barriers and find ease in learning about, finding, and making healthy, delicious meals. This lays down a strong foundation for specific treatments that follow, which include acupuncture, cupping therapy, botanical medicine, and nutraceuticals.

In practice, Dr. Kung, ND focuses on women’s health, hormone balance, and skin conditions.

Dr. Kung, ND has additional training in cosmetic acupuncture which works with traditional Chinese medicine’s philosophy of restoring balance in the body while simultaneously addressing the skin’s complexion, tone, and fine lines.

Living long and well is an ability we are all capable of as proven by the world’s Blue Zones.

When she is not working with patients, Dr. Kung, ND loves cooking with and for friends and family.   She also spends time outdoors whenever possible whether it is snowboarding, hiking in the mountains, kitesurfing, or playing tennis and cello.  Dr. Kung, ND believes that the key to health is community, and is grateful for her growing community as she joins the Dempster clinic.

Amy DeCourcy

Director of Human Resources

Amy DeCourcy is the Director of Human Resources at The Dempster Clinic- Centre for Functional Medicine

Amy DeCourcy is the Director of Human Resources at The Dempster Clinic- Center for Functional Medicine. Amy completed her undergraduate degree in Global Development Studies and French at Queen’s University and l’Université Savoie Mont Blanc, France.

After working for a legal recruiting firm downtown Toronto, Amy returned to Queen’s to obtain a degree in education. While teaching at an inner-city school, Amy completed her Masters degree in Urban Education and the Principal Qualification Program at OISE, University of Toronto.

Upon completing her maternity leave, Amy decided to further extend her leave with the school board and pursue a new role at our clinic. Amy coordinates the administrative functions, oversees the recruiting and hiring process and addresses the strategic needs of the clinic.

Email:  adecourcy@thedempsterclinic.com

Recommended Affiliate Practitioners

Personal Trainers

Igor Klibanov
Fitness Solutions Plus

Active Isolated Stretching – AIS
Fascial Stretch Therapy – FST

Phone: +1 (647) 271-8672


Lactation Consultant

Taya Griffin- I.B.C.L.C
Phone: +1 (416) 996- 0321