“It takes a team.”

Our providers care deeply about their patients. They take the time to listen to and validate their patients' health concerns which allows them to ultimately get to the root cause of their symptoms. Rather than rush through patients, they spend quality time with each patient, listen to their health concerns, and work diligently to truly optimize their health.

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Providers

Dr. Holthouse

Dr. Mark Holthouse, MD, IFMCP

Medical Director

Dr. Brus

Dr. Mario Brus, MD

Functional Pediatrician

FMI David Musnick 2

Dr. David Musnick, MD, IFMCP

Functional Medicine Internal Medicine Doctor, Functional Sports Medicine Physician

Amber Warren

Amber Warren, PA-C, IFMCP

Adult Functional Practitioner

Jennifer Paulson

Jennifer Paulson, DNP, FNP-BC, APHN-BC, IFMCP

Adult Functional Practitioner

Karen Callagy

Karen Callagy, PA-C, IFMCP

Adult Functional Practitioner

Amy Ray

Amy Ray, FNP, IFMCP

Adult Functional Practitioner

FMI _ Jessica Bennett

Jessica Bennett, CNM, APRN

Functional Women’s Health & Midwifery

FMI Michael Sermon

Michael Sermon, PA-C

Adult Functional Practitioner

Jessica Santos

Jessica Santos, FNP-C, IFMCP

Adult Functional Practitioner

Gavin Guard

Gavin Guard, PA-C, CISSN

Adult Functional Practitioner

Kristin Gomes

Kristin Gomes, APRN-CNM

Women’s Health Functional Practitioner

FMI Olivia Mangeac 2

Olivia Mangeac, PA-C

Pediatric Functional Practitioner

FMI Tamra Gyrek 1

Tamra Geryk, FNP-C, IFMCP

Women’s Health Functional Practitioner

Christa Inzer Castillo

Christa Inzer Castillo MSPAS, PA-C, MPH

Adult Functional Practitioner

FMI Janessa Tenney 2

Janessa Tenney, PA-C, IFMCP

Adult Functional Practitioner

FMI Nadia Kravchuk 1

Nadia Kravchuk, DNP, FNP-C

Pediatric Functional Practitioner

FMI Aaron Dykstra

Aaron Dykstra, DNP, FNP-C

Pediatric Functional Practitioner

Elizabeth Hingley, NP-C, IFMCP, CDCES

Family Nurse Practitioner

Registered Nurses

Lauren Numedahl _ FunMedIdaho

Lauren Numedahl, RN

Clinical Educator

Annie Sparks _ FunMedIdaho

Annie Sparks, RN

Registered Nurse

Nutritionists & Health Coaches

Alexis Villaret

Alexis Villaret, MS

Functional Nutritionist

FMI Marianne Green

Marianne Green, IFNCP, RD

Functional Nutritionist

FMI Lexi Moore 2

Lexi Moore, RD

Functional Nutritionist

Lois Payne

Lois Payne, FMCHC, NBC-HWC

Health Coach

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Dr. David Musnick, MD, IFMCP

David Musnick is a board-certified medical doctor who offers in-person and telemedicine care from the Functional Medicine of Idaho Eagle clinic. Dr. Musnick offers Functional Medicine, Sports Medicine, Functional Immunology, and Primary Care for adults and teenagers. He specializes in sports medicine, internal medicine, frequency specific microcurrent (FSM), scars, homeopathy, prolotherapy, and low-level laser treatments.

Dr. Musnick is interested in getting to the root of underlying causes and factors that affect healing, including diet, sleep, exercise, stress, mood, GI health, brain region health, toxins, mold, hormones, infections, and electromagnetic fields (EMF). He is excellent at Orthopedic diagnosis trying to determine which tissues are causing pain, what the issue with the tissue is and what is going on in the pain processing system. He has developed a unique program to heal the brain after Concussion that is based on what actually goes on in the brain after head injury. His program integrates: diet, supplements, sleep, exercise and microcurrent and brain training to heal the brain after concussion. He also applies this to other brain based disorders including cognitive impairment and dementia. He has a special interest in autoimmune disorders and has studied Functional Immunology. He is one of the top 10 clinicians in the world with Frequency Specific Microcurrent and he teaches at Microcurrent meetings. He is also very experienced in Prolotherapy regenerative injections to build more ligament to stabilize a joint or area of the spine.

In medical school, Dr. Musnick spent a year studying nutrition. He has always been interested in the complex interrelationships of different systems of the body. Taking on challenges in the past, he created new treatment programs to heal the brain after concussion, treat chronic pain, arthritis, and tough SIBO and IBS cases. Dr. Musnick wants to help his patients achieve the highest level of health, vitality and function.

After his internal medicine residency in Seattle, Dr. Musnick completed a fellowship in sports medicine where he became interested in helping patients get back to optimal musculoskeletal health and eventually back to their favorite activities. He quickly learned that many areas of the body were interrelated and started learning more about nutrition, supplements, and other facets of functional medicine. Dr. Musnick has more than 24 years of experience in Functional Medicine and achieved a very high level of both experience and expertise with many health conditions. He is also the author of the book, Conditioning for Outdoor Fitness, and helped in writing textbook chapters on arthritis and concussions.

Dr. Musnick received his Doctorate of Medicine from the University of California, San Francisco. He is certified through the Institute for Functional Medicine as an IFMCP. He also studied in the French school of Homeopathy. He is uniquely rare in that he teaches Frequency Specific Microcurrent (FSM) and how to integrate it with functional medicine.

In his spare time, Dr. Musnick enjoys hiking, nature photography, cooking healthy food, mountain biking, and skiing.

IFM Certified Practitioner

Heidi Arens, FNP, IFMCP

Heidi Arens received a Bachelor of Science in Nursing from Point Loma Nazarene University in 2008. For 11 years, she worked at Scripps Health in San Diego, California caring for patients with a myriad of cardiovascular and metabolic diseases. She has also worked extensively as a float nurse for 9 hospitals in a wide variety of specialties, both in San Diego and Denver.

Throughout her career, she has embraced numerous leadership roles working with interdisciplinary teams to improve clinical outcomes, care delivery, and patient satisfaction. Although caring for people during an acute health crisis is incredibly rewarding, Heidi saw a need for a different approach that could help people address the root cause of illness and empower them to take an active role in transforming their own health. This inspired Heidi to become a Family Nurse Practitioner and specialize in functional/integrative medicine. Heidi received a Master of Science in Nursing from Azusa Pacific University in 2017 and is a board certified Family Nurse Practitioner. She has done further training with the Institute for Functional Medicine, as well as specialty training in IV therapy, ozone therapy, and prolozone therapy. This training has equipped her with an entirely new set of tools to help identify the underlying causes of disease or dysfunction and partner with patients to restore and maintain health.

For the past several years, she has been working in the field of integrative and functional medicine helping patients with cardiometabolic dysfunction, gastrointestinal disorders, SIBO, food intolerances, acute and chronic infections, various environmental exposures, thyroid dysfunction, autoimmune diseases, and hormonal imbalances. She has a strong clinical interest in helping patients with mold related illness, chronic fatigue, and mitochondrial dysfunction. Heidi believes that achieving optimal health takes a village and she is honored to be part of a dynamic interdisciplinary team at Functional Medicine of Idaho. She looks forward to partnering with you and helping you on the journey towards vibrant health.

Outside the office, you can find Heidi traveling the world, trekking up mountains, at the yoga studio, attending a conference, listening to podcasts, or cooking something delicious.

IFM Certified Practitioner

Mark Holthouse, MD, ABoIM, IFMCP

Dr. Mark Holthouse MD has been the acting medical director at FMI since 2020. He graduated from Loma Linda University School of Medicine and went on to obtain his Family Practice training at UC Davis Medical Center while in the Air Force Scholarship program at David Grant Medical Center, Travis AFB. “Dr. H” has over 32 years of family practice experience and brings years of practice in the areas of Functional/Integrative Medicine.

As part of the Institute for Functional Medicine teaching faculty, he has educated thousands of practitioners in hormone health across the nation over the past 10 years. As an assistant professor of medicine on the teaching faculty at Loma Linda University School of Medicine, he is an expert on cardiometabolic diseases prevention, reversing type 2 diabetes, heart disease, high cholesterol, obesity and metabolic syndrome. In addition to his clinical and teaching experience, he has 30 years of owning his own private practice as acting medical director implementing strategic models in clinical practice and the business of Functional Medicine.

Dr. Holthouse and his wife Tammie enjoy photography, snowshoeing, skiing, sailing, hiking, kayaking and good food of course!

Areas of Expertise:

• Expertise in both Men's & Women's Hormone Management and Bioidentical Hormone Replacement Therapy: pellets etc.

• Expertise in thyroid and adrenal gland imbalances

• Expertise in reversing pre-diabetes, diabetic medicine, metabolic syndrome

• Optimizing body composition: lean muscle and belly fat removal / Intermittent Fasting

• Expert in managing cholesterol, cardiac, and blood pressure from a holistic perspective

• Expertise in anti-aging and cellular senescence management

• Expertise in environmental medicine: heavy metals, mold diseases, Mast Cell Activation Syndromes

• Expertise in holistic approaches to autoimmune and gut health

• General Functional Medicine

IFM Certified Practitioner

Jennifer Hudson, DO, FACOG

Dr. Jennifer Hudson obtained her medical degree from Virginia College of Osteopathic Medicine (2007) and completed her residency training in OB/Gyn at Wright State University/Wright-Patterson Air Force Base in Dayton, OH (2011). She is a board certified OB/Gyn specialist through the American Congress of Obstetrics & Gynecology (2012). For her functional medicine training, she has completed the Kresser Institute’s ADAPT Framework Level One course and is currently working toward her certification through the Institute of Functional Medicine. She transitioned from conventional OB/Gyn practice in 2019 to pursue professional goals in assisting women of all ages in their quest of optimizing health and promoting healing by identifying the root cause of symptoms.

Her interest in Functional Medicine started with her own journey to get healthier in preparation for pregnancy, and she continues to reap these rewards every day in her own life and that of her family. She provides care for women with an integrative and holistic perspective; her favorite clinical interests include fertility, natural birth, lactation, family planning/contraception, gynecologic procedures, and minimally-invasive gynecologic surgery. Dr. Hudson boasts an extremely low cesarean rate and loves partnering with local birth workers to foster the beautiful process of childbirth in a hospital. She has privileges at St. Luke's facilities.

At this time, Dr. Hudson is narrowing her practice to Functional obstetrics, preconception/fertility, and gynecologic surgery but is continuing to offer Well Woman care and other gynecological needs on a limited basis. For primary care and general functional medicine needs, please seek a consult with one of our adult functional medicine providers.

Dr. Hudson moved to Idaho in 2011 as a newlywed and has called this “honeymoon” home ever since. She describes herself as a former New Yorker, collegiate athlete, Air Force veteran, and now a crunchy mom who wants to share her journey of natural health with fellow women.

When not in the office, Dr. Hudson enjoys hiking the Boise foothills, hot springs, paleo cooking, travel, sleep, and her pets Lucy, Sunny, and June.

Please note: Dr. Hudson is currently only accepting OB patients at this time.

Nadia Kravchuk, DNP, FNP-C

Nadia Kravchuk is a board certified Family Nurse Practitioner with a Doctor of Nursing Practice degree. She offers functional pediatric primary care, including well-child checks and acute visits, in the Pediatric Department of the Functional Medicine of Idaho Meridian Wellness Center.

Nadia and her family immigrated to the United States in 1989 where they first settled in Oregon and then moved to Idaho in 2001. Complementary medicine practices were embedded into her lifestyle at a young age, and she has implemented these principles into her conventional medicine practice throughout her career. She has more than 15 years experience in a variety of medical environments, including emergency room, intensive care unit, pediatrics, obstetrics and gynecology, family practice, and aesthetics.

Nadia joined Functional Medicine of Idaho so that she can combine functional principles with the foundations of conventional medicine to address the underlying causes of disease and promote optimal wellness. As an avid gardener, beekeeper, and sustainable living enthusiast, she understands the importance and role of optimizing nutrition, sleep, physical, spiritual, and emotional well-being. She has a passion for pediatric functional medicine and understands that early recognition and interventions can correct imbalances, prevent chronic illness, and improve overall outcomes for children.

Nadia obtained her Bachelor of Science in Nursing at Northwest Nazarene University. She earned both her Master’s of Science in Nursing and Doctor of Nursing Practice through Frontier Nursing University. In 2017, she was the recipient of the HCA Excellence in Nursing Award. She is currently working towards her certification with The Institute for Functional Medicine.

Outside of work, you will find Nadia working on her urban homestead, hiking, foraging, camping, snowboarding, and spending time with her husband and her dog, Wolfy. She is also fluent in both English and Russian.