Peak Health Institute operates as a functional medicine clinic in Warrenville, Illinois, under the medical direction of Katie McManigal, a board-certified family medicine physician with advanced training from the Institute for Functional Medicine and the American Academy of Anti-Aging Medicine. The practice addresses chronic illness management, hormone optimization, and preventative care through comprehensive diagnostic testing and individualized treatment protocols. Patients travel to the Warrenville office for in-person consultations, where Dr. McManigal and her clinical team conduct detailed health histories and functional assessments to identify root causes of persistent health concerns including Lyme disease, hormonal imbalances, and multi-system chronic conditions that have not responded to conventional approaches.
The clinic incorporates NAD+ therapy as part of its regenerative medicine offerings, utilizing this coenzyme to support cellular energy production, mitochondrial function, and metabolic optimization. Treatment plans frequently combine NAD+ protocols with targeted nutritional supplementation, compounded hormone preparations, and lifestyle interventions tailored to each patient's laboratory findings and symptom patterns. Dr. McManigal's training through A4M informs the clinic's approach to age-related decline and optimization strategies, while her functional medicine certification guides the systems-based evaluation of complex chronic presentations. The practice works with specialized compounding pharmacies to formulate customized hormone preparations and nutrient combinations when standard pharmaceutical options do not address individual patient requirements.
Patients at Peak Health Institute in Warrenville typically begin with extended initial consultations that review medical history, current symptoms, previous treatments, and comprehensive laboratory panels including hormone levels, nutrient status, inflammatory markers, and metabolic function tests. Dr. McManigal interprets these results within a functional medicine framework, identifying patterns of dysfunction across endocrine, immune, digestive, and detoxification systems. Follow-up visits track symptom resolution, adjust supplement protocols, and modify treatment plans based on repeat testing and clinical response. The practice maintains a focus on patient education, explaining the rationale behind each intervention and how specific therapies address identified imbalances or deficiencies.
The clinic's approach to chronic illness management extends beyond symptom suppression to address underlying physiological dysfunction, particularly in cases where patients have consulted multiple specialists without achieving sustained improvement. Dr. McManigal's board certification in family medicine provides a foundation in conventional diagnosis and treatment, while her functional medicine training allows for investigation of factors often overlooked in standard medical practice, including environmental exposures, gut microbiome disruption, chronic infections, and mitochondrial dysfunction. Patients with Lyme disease and associated co-infections receive protocols that address both active infection and the immune dysregulation and systemic inflammation that persist after standard antibiotic treatment.
Peak Health Institute serves patients throughout the western Chicago suburbs from its Warrenville location, requiring in-person visits for initial evaluations and periodic follow-ups while offering flexibility in monitoring protocols between appointments. The practice's 4.9-star rating across 108 Google reviews reflects patient experiences with the clinical team's responsiveness to questions, thoroughness in addressing complex symptom presentations, and willingness to investigate chronic conditions that have proven difficult to diagnose or treat elsewhere. Dr. McManigal's multi-credential background allows the clinic to bridge conventional and functional approaches, offering patients access to both standard medical interventions and advanced regenerative therapies like NAD+ within a single practice focused on long-term health optimization rather than acute symptom management.
Katie McManigal· Medical Director
Katie McManigal, Board-Certified Family Nurse Practitioner
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 treat complex health issues and conditions.
Jessica Montalvo, MD, MD
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.
Dr. Kelsie Lazzell, ND, DC, ND, DC
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.
Dr. Caley Scott, Naturopathic Doctor
Naturopathic Doctor
Dr. Caley Scott is a licensed naturopathic doctor with a passion for helping patients achieve optimal health through a holistic, root-cause approach.
Jordan Neumann, DNP, DNP
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.
Racheal Feliz, FNP-BC, FNP-BC
board-certified Family Nurse Practitioner
Racheal Feliz, FNP-BC, is a board-certified Family Nurse Practitioner with 19 years of experience in healthcare.
Topics Mentioned in Reviews
Vitamin IV Therapy
IV therapy that delivers vitamins directly into the bloodstream for optimal absorption.
NAD+ IV Therapy
IV therapy that provides NAD+ to enhance cellular function and energy.
Microneedling PRP Treatment
A treatment that uses microneedling combined with PRP to rejuvenate the skin.
Ozone IV Therapy
IV therapy that uses ozone to promote healing and reduce inflammation.
Peptide Therapy
Therapy that utilizes peptides to enhance various bodily functions.
Joint Injection Therapy
Injections to relieve joint pain and improve mobility.
Fertility & Postpartum Support
Support services for fertility and postpartum recovery.
Hormone Replacement Therapy
Therapy to balance hormones and alleviate symptoms of hormone imbalance.
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