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Root Cause Functional Medicine- Peter Kozlowski MD & Brian Grimaud DO
Doctor in Elk Grove Village, IL
4.9 · 142 ReviewsWhat this place offers
Meet the team

Peter Kozlowski
Functional Medicine Physician
Dr. Peter Kozlowski is a functional medicine physician practicing root-cause medicine since 2011, known for helping patients make sense of complex chronic symptoms with a thoughtful, evidence-informed, whole-person approach.

Brian Grimaud
Board-Certified Anesthesiologist
Dr. Grimaud brings more than 15 years of critical care experience and a deep commitment to root-cause medicine. His approach combines strong clinical judgment with a whole-person focus on lifestyle, nutrition, environment, and the deeper drivers of chronic illness.
Services
Gut Health
Endoscopy
Lab Testing
Hormone Replacement Therapy
Detoxification
Cardiovascular Care
Fertility Support
Modalities
Functional Medicine
Natural Healing
Nutritional Counseling
Conditions treated
About this place
Root-cause, relationship-centered functional medicine in Chicago, helping you open what’s been blocked and cross back toward health and connection.
Practice Philosophy
Patients deserve to be heard, understood, and guided with both wisdom and clarity. The approach combines careful listening, root-cause investigation, advanced clinical insight, and practical strategies that help patients take meaningful steps toward lasting health.
Contact
4.9 · 142 Reviews
Esther Feder
2 months ago
Dr. Kozlowski is just who we were looking for. We had seen a few other functional medicine practitioners and they did not work out. Dr. Koz listens to you, he is very thorough, always follows through and is willing to partner with you to address your concerns and health issues. He is very open about his own past experiences which helps him to be more relatable. If you are looking for an excellent thorough functional medicine doctor, you should look no further and work with Dr. Koz.
Bess abc
a year ago
My husband saw Dr. Kozlowski for a variety of health problems including hypertension, diabetes and kidney disease. My husband's a1c dropped from a concerning level of 11.1 to a healthy 6.8 level in about 4 months time which is remarkable. Dr. Kozlowski's advice and healing methods have advanced my husband's health to the surprise of his regular doctors. I would highly recommend Dr. Kozlowski if you are on a path of healing. We are grateful for all he has done to improve my husband's health.
Maria Torres
3 years ago
After suffering with digestive issues for many years, decided to try a different approach to treating it. I gave functional medicine a try and I am so happy I did, because many doctors I consulted in the past, just prescribed acid blockers without ever doing any testing. Those doctors just matched a prescription to my symptoms. Dr. Kozlowski was so attentive and professional from the start. From how easy it was to connect with Mackenzie to schedule an appointment to the actual visit. Dr. Kozlowski did not just give me something to treat my symptoms, he recommended some tests to find the cause. He gave me all the optional treatments so I could choose the most appropriate in my case. I started to feel so good within 3-4 days of starting my treatment. Its been 2 weeks since I finished the treatment and I feel like I had not felt in many years. I am learning what foods I need to avoid and which ones I can enjoy sparingly. Don't waste years like I did, just contact Mackenzie and schedule your appointment with Dr. Kozlowski today!
Amber Ciotti
a year ago
I visited Dr. Koz in search of answers I wasn’t getting from other doctors. I was diagnosed with Hashimoto’s 10 years ago and have never felt myself since. I’ve been on a functional medicine journey for years trying to address the symptoms but never found much improvement. Dr. Koz is the first doctor to not only acknowledge everything I had shared, but to tell me WHY it was happening. I learned more in 2 hours with him than I have from any other doctor in 10 years. He validated my symptoms and we got to work. Within WEEKS, I started feeling better than I had in years. I highly recommend Dr. Koz!
Patrick
a year ago
I am a 28 year old fit male that had been struggling with chronic GERD for over 4 months when I went to see Dr. Kozlowski. I had been to my PCP, and a gastroenterologist and all they did was put me on high doses of a PPI. This ultimately did not treat the underlying cause, so I sought out Dr. Kozlowski to go the functional medicine route. After meeting with him for almost 2 hours where he took the time to truly get to know me and educate me on what the root cause could be, he had me take multiple tests and gave me the tools to heal. Within a few weeks I was off my PPI and feeling MUCH better. This isn’t an exaggeration…I feel like Dr. Kozlowski helped me get my life back. If you are struggling with chronic health problems, I could not recommend Dr. Kozlowski enough. He gives you the tools, but you have to put in the work. Incredibly grateful for his guidance!