About
Dr. Jan Mensink built a medical career across three disciplines before founding The Practice Bakersfield. He trained in family medicine at Florida Hospital in Orlando, Florida, and spent approximately 30,000 hours practicing emergency medicine across Los Angeles. He also completed nearly five years of neurosurgery training and worked in neurosurgery in Bakersfield beginning in 2000.
Dr. Mensink held board certification with the American Board of Family Medicine and served as a longtime member of the American Academy of Anti-Aging Medicine. In July 2015, Western University of Health Sciences appointed him Clinical Assistant Professor of Family Medicine. His clinical passions centered on anti-aging and longevity, bioidentical hormone therapy, testosterone replacement, vitamin D3 optimization, magnesium replacement, gut health, and treating depression without antidepressants. He believed the foundation of good medicine was promoting health rather than only managing symptoms.
Education & Training
Medical School
Medical school in Edmonton, Alberta, Canada
Residency
Family Practice Residency, Florida Hospital, Orlando, Florida; Neurosurgery Residency (approximately 5 years)
Additional Training
Clinical Assistant Professor of Family Medicine, Western University of Health Sciences – College of Osteopathic Medicine of the Pacific (appointed July 2015); Member, American Academy of Anti-Aging Medicine (A4M)
Certifications
Conditions Treated
Who is Dr. Mensink right for?
Dr. Mensink was well suited for adults seeking a preventive and functional approach to primary care. Patients dealing with hormone imbalance, thyroid dysfunction, low testosterone, or weight management responded well to his evidence-based protocols. He worked effectively with people managing chronic conditions such as hypertension, diabetes, or depression who wanted root-cause treatment rather than symptom suppression. Adults over 40 focused on longevity and healthy aging were a particularly strong fit for his clinical approach.
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Family MedicineFrequently Asked Questions
Dr. Mensink specialized in a wide range of conditions including hypertension, diabetes, obesity, depression, adrenal fatigue, hormone imbalance, low testosterone, thyroid disorders, irritable bowel syndrome, and deficiencies in vitamin D and magnesium. He also treated erectile dysfunction and focused heavily on anti-aging medicine. His approach addressed root causes through lifestyle optimization and targeted interventions.
Dr. Mensink believed the key to anti-aging medicine was promoting health and wellness rather than only treating symptoms. He focused on preventing illness and optimizing lifestyle so patients could live longer, healthier lives. His clinical work centered on hormone optimization, micronutrient correction, and gut health as foundational tools.
Yes. Dr. Mensink held board certification with the American Board of Family Medicine. He also maintained long-standing membership in the American Academy of Anti-Aging Medicine and regularly attended their conferences and seminars.
Dr. Mensink attended medical school in Edmonton, Alberta, Canada. He completed his Family Practice Residency at Florida Hospital in Orlando, Florida. He also completed nearly five years of neurosurgery training and spent approximately 30,000 hours practicing emergency medicine in Los Angeles.
Yes. Western University of Health Sciences appointed Dr. Mensink as Clinical Assistant Professor of Family Medicine at their College of Osteopathic Medicine of the Pacific in July 2015. He also presented The Practice Clinics of America model to the Harvard Business School.
Dr. Mensink was passionate about treating depression without relying on antidepressants. He explored connections between gut health, hormonal balance, vitamin deficiencies, and mood. This functional approach looked at underlying biological contributors rather than defaulting to pharmaceutical symptom management.
Yes. Bioidentical hormone replacement therapy and testosterone replacement were central to Dr. Mensink's clinical practice. He viewed hormone optimization as a core component of anti-aging medicine and worked to correct imbalances that affected energy, weight, mood, and overall function.
Doctor profile last updated June 9, 2026