The Functional MDs is a physician-led functional and integrative medicine clinic located in Carmel, Indiana, recognized as one of the top holistic medicine practices in the region. Founded by Dr. Simranjit Singh, MD, FACP, DABOM, FMACP, IFM-CP, and staffed by a team of double board-certified physicians and certified health coaches, The Functional MDs was built on a single conviction: that most chronic health conditions have a root cause that can be identified and treated when the right physician takes the time to look. The practice delivers in-person care in Carmel and extends its physician-led functional medicine platform via secure telehealth to patients across Indiana, Texas, Washington, Illinois, Pennsylvania, Ohio, Michigan, and Kentucky. Unlike volume-driven conventional practices, The Functional MDs invests in comprehensive diagnostics, extended consultations, and ongoing care relationships — delivering the depth of attention that complex, chronic health problems genuinely require. The clinic has been independently recognized as a Top 3 Holistic Medicine Practitioner in Carmel, a distinction earned through consistent patient outcomes rather than marketing.

About the Physicians

Dr. Simranjit Singh, MD, FACP, DABOM, FMACP, IFM-CP, is the Founder & CEO of The Functional MDs. Board-certified in Internal Medicine and Obesity Medicine with advanced Functional Medicine training from the Institute for Functional Medicine, Dr. Singh completed his Internal Medicine residency at the University of Illinois and served as both a hospitalist and faculty physician at Indiana University Health Methodist Hospital. He has authored more than 30 peer-reviewed scientific publications, multiple book chapters, and internationally recognized clinical guidelines — a research pedigree that grounds The Functional MDs' protocols firmly in evidence. Dr. Sanna Singh, MD, DABOM, FMACP, is double board-certified in Internal Medicine and Obesity Medicine with 13+ years of clinical experience and advanced training in functional and integrative medicine. She specializes in hormone health, metabolic conditions, and functional fertility, managing the full spectrum of perimenopause, menopause, low testosterone, adrenal dysfunction, and reproductive challenges with a structured, lab-informed approach to diagnosis and personalized treatment planning.

Services Offered

• Hormone Optimization Therapy — Bioidentical hormone replacement addressing thyroid, adrenal, and sex hormone imbalances — including perimenopause, menopause, and low testosterone — using a comprehensive lab-informed approach to restore full-spectrum hormonal balance.
• Autoimmune Conditions & Chronic Inflammation — Root-cause evaluation and integrative management of autoimmune disease and systemic chronic inflammation, targeting immune dysregulation rather than suppressing symptoms alone.
• Gut Health & Food Sensitivities — Advanced gastrointestinal assessment and personalized gut restoration protocols to heal intestinal permeability, resolve food sensitivities, and restore the microbiome balance that underlies systemic health.
• Peptide Therapy & Cellular Regeneration — Physician-supervised peptide protocols supporting cellular repair, metabolic recovery, immune resilience, and anti-aging regeneration — administered with full medical oversight and ongoing monitoring.
• Functional Fertility & Reproductive Health — Root-cause fertility care for both men and women, addressing hormonal, metabolic, and inflammatory barriers to conception through personalized integrative treatment plans.
• Cardiometabolic Health — Advanced assessment and management of cardiovascular risk factors, blood sugar dysregulation, insulin resistance, and cholesterol imbalance using functional medicine and lifestyle-based strategies.
• Mood & Cognitive Health — Functional evaluation and treatment of anxiety, depression, brain fog, memory concerns, and mood imbalance, targeting underlying neurological, hormonal, and inflammatory drivers.
• Longevity & Healthy Aging — Comprehensive longevity medicine programs focused on slowing biological aging, optimizing cellular vitality, and building a personalized strategy for lifelong health performance.
• Thyroid Health, Chronic Fatigue & Lyme Disease — Specialized root-cause care for hypothyroidism (including Hashimoto's), fibromyalgia, chronic fatigue syndrome, and Lyme disease — conditions frequently dismissed or undertreated in conventional settings.
• Toxin Exposure, CIRS & Post-Viral Recovery — Structured evaluation and treatment for mold toxicity, heavy metal exposure, CIRS/MARCoNS, and post-viral syndromes including Long COVID, with phased protocols rebuilding immune and neurological function.
• Direct Primary Care — A membership-based primary care model providing direct physician access, longer visits, and proactive health management — without the constraints of insurance-driven, volume-focused conventional care.

What to Expect

The Functional MDs is located at 75 Executive Dr, Suite D, Carmel, IN 46032. Phone: +1 (855) 659-7311. Email: hello@thefunctionalmds.com. Website: thefunctionalmds.com. In-person care is available in Carmel; telehealth consultations are available to patients in Indiana, Texas, Washington, Illinois, Pennsylvania, Ohio, Michigan, and Kentucky. Free discovery calls are available to prospective patients — book at thefunctionalmds.com/book-now.