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Dr. Mark Holthouse, MD is the Chief Medical Officer of FMI CENTER FOR OPTIMAL HEALTH and a fearless leader who specializes in:

Hormone Optimization,
Age Reversal &
Metabolic Health

Dr. Holthouse is available to see patients in
Idaho, Oregon, Nevada & California!

Dr. Mark Holthouse MD is the Chief Medical Officer for FMI CENTER FOR OPTIMAL HEALTH & Functional Medicine of Idaho. 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

Why Dr. Holthouse Created The Precision Age Reversal (PAR-1) 12-Month Program:

Precision Age Reversal (PAR-1) is not simply about living longer but living better, avoiding the suffering from avoidable diseases as we age. If you want to put off or avoid what happens by default to most people after they hit their 70s with chronic diseases taking over, creating a poor quality of life, then PAR-1 is for you! New discoveries and advances in genetics, testing and molecular biology have made it possible to look at how we age at a cellular level. Imagine having the power to not only slow down but frequently reverse the aging process at the cellular level—this means a direct impact on curbing the top 10 causes of death by slowing tissue and organ diseases. It's a game-changer for your health and longevity!

  • Aging is now seen as a disease in itself

  • Aging is now the #1 risk factor for the chronic diseases we all get in time: heart disease, strokes, cancers, arthritis, bone loss, dementia, hormone losses, diabetes and obesity to name a few


What PAR-1 Offers:

  • 1:1 time with Dr. Holthouse to customize your treatment plan

  • Genetic assessment

  • Personalized diet and exercise based on your genetics

  • Vascular plaque burden and plaque vulnerability for rupture assessment

  • Vascular and systemic inflammation markers tested beyond what has traditionally been done

  • Advanced hormone and lipid assessments

  • Advanced body imaging testing

  • Cellular aging through specialty lab panels

  • Stool testing

  • Food allergy and sensitivity testing

  • DUTCH hormone testing

  • Body composition assessment for % body fat and lean muscle

  • Biological age assessment

  • Cancer screening beyond the standards of care

  • Supplement and pharmaceutical suggestions for your personal anti-aging protocol

  • Dietitian and coaching support

  • Personalized exercise 1:1 coaching program

Learn More About PAR-1 Here



Experience precision care with Dr. Mark Holthouse, MD. Call or Text to learn more: (208) 609-9130

Features & Podcasts

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Functional Medicine


Ep. 18: Prolong Your Life with Dr. Mark Holthouse, MD

Click here

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Functional Medicine Foundations

Ep. 2: How To Be A Radiant Woman with Dr. Mark Holthouse, MD

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Functional Medicine


Ep. 3: Becoming An Optimal Man with Dr. Mark Holthouse, MD

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Hormones, Mitochondria & More with Dr. Mark Holthouse, MD

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