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Peak Health Institute - Functional Medicine
Medical Center in Warrenville, ILOpens 9:00 AM
4.9 · 117 ReviewsConsultation & booking
What this place offers
Meet the team
Katie Mcmanigal
Founder & Medical Director
Katie McManigal is a board-certified family nurse practitioner who specializes in functional and regenerative medicine. She began her career as a Neonatal Intensive Care Unit RN at Lurie Children’s hospital. During this time, she developed and honed the critical thinking skills necessary to uncover and support complex health issues and conditions.
Jessica Montalvo
Functional Medicine, Medical Doctor
Jessica received her bachelor’s degree in English and American literature from Harvard University. She attended the University of Rochester School of Medicine. She completed a residency in internal medicine at Northwestern in Chicago and subsequent training in hospice and palliative medicine.
Kelsie Lazzell
Naturopathic Doctor
Dr. Kelsie Lazzell is a dual‑trained naturopathic doctor and doctor of chiropractor at Peak Health Institute, dedicated to empowering your body’s innate healing capacity. Grounded in the naturopathic principle of working with the body rather than against it, she blends foundational lifestyle interventions—targeted nutrition, movement, stress management, and gentle detoxification—with advanced therapies like botanical and nutraceutical support, IV nutrient infusions, and peptide protocols.
Jordan Neumann
Board-Certified Family Nurse Practitioner
Jordan Neumann is a Board-Certified Family Nurse Practitioner who brings a wealth of experience and a passion for functional medicine to Peak Health Institute. She graduated with her Doctorate of Nursing Practice from Rush University, where she also completed rigorous training in various medical disciplines.
Racheal Feliz
Nurse Practitioner | Functional & Regenerative Medicine
Racheal Feliz is a Board-Certified Nurse Practitioner with 19 years of experience in the medical field. She received her Bachelor of Science in Nursing from Indiana Wesleyan University and her Master of Science as a Family Nurse Practitioner from Chamberlain University.
Services
NAD+ Therapy
Peptide Therapy
Hormone Replacement Therapy
Ozone Therapy
Functional Medicine
Regenerative Medicine
Lab Testing
Nutritional Counseling
Acupuncture
Modalities
Functional Medicine
Natural Healing
Regenerative Medicine
IV Therapy
Peptide Therapy
Chiropractic Adjustment
Acupuncture
Frequency Specific Microcurrent
Hormone Therapy
Lifestyle Medicine
Platelet-Rich Plasma Therapy
Ozone Therapy
Joint Injections
Conditions treated
What to expect on your first visit
During your first appointment, your care provider will take a comprehensive health history to understand the complete picture of your health. We will then run comprehensive lab tests to determine the health of a variety of systems. With the information gathered, your care provider will develop a unique therapy plan to optimize your health, heal any systems in distress, and make recommendations to improve your overall quality of life.
From our patients
“Highly recommend to anyone looking for top-notch health services!”
“Katie and team are incredible. Whenever I have issues, I go to her first. I can’t recommend her and the team enough!”
“I highly recommend it to anyone striving to become a better version of themselves, it’s a true destination for all things health and wellness.”
“The front desk staff are consistently helpful, and the providers truly care about addressing my health concerns. I always feel genuinely heard, a rarity in my healthcare experience.”
“Dr.Montalvo and her staff are amazing! Her nurse Vanessa is so compassionate in providing patient care. They really address your health needs I absolutely recommend Peak Health Institute for all your health and wellness needs.”
About this place
Achieve peak health with functional medicine in Chicagoland. Our doctors take an integrative and functional approach to optimizing your health.
Practice Philosophy
Healthcare shouldn’t be reserved for when you’re ill. Integrative medicine offers a preventative model of care that will give you the tools and empowerment to reach peak performance and stay there.
Business hours
Contact
4.9 · 117 Reviews
Lemurian Donna Carol
3 months ago
I am happy that I have found Peak Health Institute. Their work is comprehensive and clear. After blood and stool testing, I know exactly what I am deficient in, especially regarding hormones. I am now receiving treatment and have full trust in my healthcare professional there, as she is an expert in functional medicine. It is not cheap but if you want real results healing your fatigue, etc., this is the place!
Inga Tice
9 months ago
I’ve been on a long and challenging journey dealing with Lyme disease, mold toxicity, and heavy metal detox. After visiting numerous offices and trying countless protocols over the years, nothing truly clicked—until I found Peak Institute. The team at Peak is truly exceptional. Their attention to detail is unmatched, and what sets them apart is their ability to look at the full picture rather than just isolated symptoms. They approach healing with a wide-ranging perspective, integrating multiple disciplines and innovative treatments in a way that feels both grounded and deeply personalized. Every appointment is punctual, and the environment is warm, professional, and genuinely caring. From the moment you walk in, you feel seen, heard, and supported—not just as a patient, but as a whole person. They work with compounding pharmacies and my prescription is sent immediately. All their staff members are very caring and I have seen them for a long time. I’m also very glad that I can draw the blood at their clinic. So convenient! Thanks to Peak Institute, I’m finally experiencing real, sustainable progress in my healing journey. I’m incredibly grateful for their expertise, compassion, and the hope they’ve restored in my life. If you’re looking for a team that truly understands complex, chronic conditions and how to treat them at the root—this is the place.
Nina Norasith
a year ago
We are so thankful to Peak Health for all the amazing experiences we've had with our girls! Without the care and support of their practice, we wouldn't have been able to get the IV therapy our girls needed. The team is always professional, friendly, and truly dedicated to helping their patients. Highly recommend to anyone looking for top-notch health services!🩷
Concept Roses
a year ago
Dr.Montalvo and her staff are amazing! Her nurse Vanessa is so compassionate in providing patient care. They really address your health needs I absolutely recommend Peak Health Institute for all your health and wellness needs.
Lisa Keller
10 months ago
I have been to Peak Health a total of 5 visits beginning in April of 2024 for HRT and saw 3 different providers, all due to staff departures. I just learned that the last one has recently left, which would put me at #4 if I continued. Clearly, they have high practitioner turnover. In additional to this, I offer the following as a few main reasons that I do not recommend them: They have no relationships with any local compounding pharmacies. This matters if you do not want your prescriptions shipped. I was referred by one practitioner to a local compounding pharmacy that did not even provide the service pertaining to the script. This is something they clearly should know. They are a hard sell on pellets, even though I told them repeatedly I was a hard “no” and absolutely NOT interested in them. Still, this came up in EVERY visit and MY reasoning was challenged quite forcefully. I received mixed messages about available therapies from the same practitioner on multiple occasions. Usually accompanied by a strong redirect to their ‘preferred’ formulas (compounded vs. FDA approved). Labs drawn at their facility (contracted with HealthLab) take 2-3 weeks for results to come back. For self-pay on labs, they will not provide up front pricing. For a recent hormone only panel, the total charges were $2,296.00, of which the self-pay portion owed was $803.60. This was substantially different from the prior time I had this same panel and paid only $110.80 out of $2,216.00. Obviously, these prices are grossly inflated. In attempt at resolving this discrepancy, I was told that Peak Health has absolutely nothing to do with the lab services billing and that there are no negotiated rates or discounts with the lab, and they deny making any profit from the tests they order. There are better alternatives that will provide up front pricing and have much faster turnaround. Peak Health will however work on steering you - two of the practitioners mentioned that other labs could render inaccurate/skewed results; leading you to believe others are not to be trusted and using “their lab service” is the only way to go. My impression of Peak Health is they appear to be more concerned about upselling you and using their ‘preferred’ products/services, in order to maximize profits than they are about actual patient results, at least mine. They have fumbled my care repeatedly, including prescriptions getting called in/refilled, inaccurate clinical history, lack of preparation for appointments, poor bedside manner, conflicting messages, and overall lack of accountability when challenged on issues. There is far better care available elsewhere.