About
Dr. Mishal Reja serves as Gastroenterologist and Longevity Physician at Extension Health. He earned his BA at Columbia University, his MD at Thomas Jefferson Medical College, completed his residency at Robert Wood Johnson University Hospital, and finished a gastroenterology fellowship at SUNY Downstate. He holds dual board certifications in internal medicine and gastroenterology.
Dr. Reja has authored and presented more than 60 studies at journals and conferences worldwide, covering gastrointestinal health, metabolic health, and functional medicine. He leads the Gut Health Optimization Program at Extension Health. He is passionate about metabolic health and individualized care designed to support long-term outcomes. Outside the clinic, he enjoys the gym, soccer, cooking, and travel.
Education & Training
Undergraduate
BA, Columbia University
Medical School
MD, Thomas Jefferson Medical College
Residency
Internal Medicine, Robert Wood Johnson University Hospital
Fellowship
Gastroenterology, SUNY Downstate
Certifications
Languages
English
Conditions Treated
Who is Dr. Reja right for?
Dr. Reja is a strong fit for patients dealing with gastrointestinal conditions or metabolic health concerns. Adults seeking a functional medicine perspective on gut health will find his approach particularly valuable. He works well with patients who want individualized, evidence-based protocols for long-term wellness. Those interested in longevity medicine alongside GI care benefit from his dual board-certified background.
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Frequently Asked Questions
Dr. Reja treats a broad range of gastrointestinal and metabolic conditions. His clinical focus includes gut health optimization, metabolic dysfunction, and preventive medicine. He applies functional medicine principles to identify root causes and build individualized care plans.
Yes. Dr. Reja holds dual board certifications in internal medicine and gastroenterology. He completed his gastroenterology fellowship at SUNY Downstate after his residency at Robert Wood Johnson University Hospital.
Dr. Reja leads the Gut Health Optimization Program at Extension Health. The program takes a functional and precision medicine approach to digestive and metabolic health. He tailors protocols to each patient's individual biology and long-term goals.
Dr. Reja earned his MD at Thomas Jefferson Medical College and his BA at Columbia University. He completed his residency at Robert Wood Johnson University Hospital and his gastroenterology fellowship at SUNY Downstate.
Yes. Dr. Reja has authored and presented more than 60 studies at journals and conferences worldwide. His research covers gastrointestinal health, metabolic health, and functional medicine.
Dr. Reja focuses on individualized care designed to support long-term outcomes. He integrates functional medicine with gastroenterology and internal medicine to address root causes. He is particularly passionate about metabolic health and its connection to overall longevity.
Yes. Dr. Reja practices as both a gastroenterologist and a longevity physician at Extension Health. He combines his GI expertise with a broader preventive and metabolic focus to serve patients seeking long-term health optimization.
Doctor profile last updated March 21, 2026