About
Dr. Tina Harrison serves as Medical Director of Defy of Indiana. She holds board certification in internal medicine and brings more than 20 years of clinical experience treating both acute and chronic illness. Before joining Defy, she served as medical director and liaison for a hospital network and individual medical practices. That background gives her a strong foundation for weaving functional medicine principles into evidence-based primary care. Dr. Harrison focuses on identifying root causes rather than managing symptoms in isolation. Her clinical range spans hormone optimization, thyroid care, metabolic health, gut function, and nutrient evaluation. Patients at Defy benefit from her ability to interpret complex lab work through a functional lens while drawing on her deep internal medicine training.
Certifications
Conditions Treated
Who is Dr. Harrison right for?
Dr. Harrison is a strong fit for adults seeking root-cause answers to chronic or complex health concerns. Patients dealing with hormone imbalances, thyroid dysfunction, or metabolic issues benefit from her integrated approach. She works well with those who want thorough lab interpretation paired with evidence-based treatment. Men and women pursuing hormone optimization, weight loss, or gut health support will find her clinical range well-matched to their goals.
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Frequently Asked Questions
Dr. Harrison treats a broad range of conditions including hormone imbalances, thyroid dysfunction, metabolic disorders, and gut health issues. She also supports patients with nutrient deficiencies and weight management. Her internal medicine background extends her clinical reach to both acute and chronic illness.
Yes, Dr. Harrison holds board certification in internal medicine. She also practices functional medicine, which she integrates with evidence-based primary care principles.
Dr. Harrison focuses on identifying root causes rather than addressing symptoms in isolation. She interprets complex lab work through a functional lens while drawing on more than 20 years of internal medicine experience. Her goal is to build a complete clinical picture for each patient.
Yes, Dr. Harrison provides hormone optimization services for both men and women through Defy of Indiana's dedicated DEFY for Men and DEFY for Women programs. Services include bioidentical hormone replacement therapy and BioTE pellet therapy.
Yes, thyroid optimization is a core part of Dr. Harrison's clinical focus. She evaluates thyroid function through comprehensive lab testing and develops individualized treatment plans based on her findings.
Before joining Defy of Indiana, Dr. Harrison served as medical director and liaison for a hospital network and individual medical practices. That leadership experience gave her a strong clinical and administrative foundation for her current role.
Yes, Dr. Harrison sees patients via telehealth in addition to in-office visits at the Carmel location. Patients can schedule the option that works best for their needs.
Dr. Harrison evaluates lab results through a functional medicine lens, looking beyond standard reference ranges to identify underlying imbalances. She conducts hormone testing, nutrient and lab evaluations, GI-MAP stool testing, and InBody body composition assessments as part of her diagnostic process.
Doctor profile last updated March 21, 2026