Functional Medicine Through the Lens of the Microbiome

Find the root cause of the root causes.

Dr. Raphael Kellman pioneered Microbiome Medicine, an approach that looks beyond individual symptoms to understand how the gut microbiome interacts with the immune system, thyroid, brain, metabolism and other systems throughout the body.

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Raphael Kellman, MD  |  New York City  |  In-Person & Telehealth Consultations
Dr. Raphael Kellman
1
Pioneer of Microbiome Medicine
10+
Books Authored
25+
Years of Clinical Experience
60,000+
Patients Treated
Raphael Kellman, MD →
Physician. Author. Pioneer of Microbiome Medicine.
Beyond Functional Medicine

Why Microbiome Medicine?

Most medical care begins with a diagnosis.

Functional medicine goes further by asking: "What is causing the condition?"

Microbiome Medicine goes another level deeper: "What is causing the root cause?"

Dr. Kellman's approach examines the microbiome as part of an interconnected biological ecosystem that influences systems throughout the body, including the gut, immune system, thyroid, brain, and metabolism. Symptoms that seem unrelated may sometimes be connected.

Discover Microbiome Medicine →

Your body isn't a collection of separate systems.

It's an interconnected ecosystem.

MICROBIOME BRAIN Brain Fog · Memory · Mood THYROID Energy · Metabolism · Hormonal Signaling METABOLISM Weight · Glucose · Energy IMMUNE Inflammation · Autoimmunity CELLULAR HEALTH Energy · Recovery · Healthy Aging GUT Bloating · Gas · SIBO · Constipation

One ecosystem. Many systems. Seemingly unrelated symptoms.

See How Microbiome Medicine Works →

Start with what you're feeling.

You don't need to know the diagnosis to start looking for answers.

Explore common symptoms and learn how the microbiome and other interconnected systems may play a role.

Bloating & Digestive Discomfort
Excessive Burping & Gas
Brain Fog
Persistent Fatigue
Unexplained Weight Changes
Thyroid-Like Symptoms
Constipation
Explore All Symptoms →

Conditions we approach differently

Chronic conditions rarely exist in isolation. Dr. Kellman's approach looks at relationships between the microbiome, immune system, thyroid, brain, metabolism, and other biological systems to better understand what may be contributing to illness.

SIBO & Digestive Disorders

Thyroid Disease & Hashimoto's

Autoimmune Conditions

Chronic Fatigue

Brain Fog & Cognitive Health

Metabolic Health & Weight

View All Conditions →
Dr. Kellman Explains

Understand your health differently.

Short explanations from Dr. Raphael Kellman about the microbiome, chronic symptoms, and the connections conventional testing can sometimes miss.

Gut Health

Why Am I Bloated After Almost Every Meal?

Understanding the microbiome and digestive drivers behind chronic bloating.

Thyroid

Can Your Thyroid Tests Be Normal and You Still Have Symptoms?

Why standard thyroid panels can miss what more precise testing finds.

Brain Health

What Does Your Gut Have to Do With Brain Fog?

Exploring the gut-brain connection and what conventional testing can miss.

Watch All Dr. Kellman Videos →

The Microbiome Medicine Library

Explore. Understand. Go Deeper.

Explore Dr. Kellman's articles, videos, guides, and insights into the microbiome and its relationship with systems throughout the body.

Gut & Microbiome
Thyroid & Hormones
Brain & Cognition
Immunity & Inflammation
Metabolism & Weight
Energy & Longevity
Explore the Library →

A different way to look for answers

01

Listen

Understand symptoms, history, previous testing, and what hasn’t worked.

02

Investigate

Use appropriate diagnostics to look deeper into relevant biological systems.

03

Connect

Interpret findings as part of an interconnected system rather than isolated numbers.

04

Personalize

Develop an individualized treatment strategy based on what is discovered.

Start With a Consultation

What might your symptoms be telling you?

Take Dr. Kellman's short educational gut-health assessment to explore patterns in your symptoms and learn more about areas worth investigating.

This assessment is educational and does not diagnose any medical condition.

Take the Assessment
Patient Experiences

When you finally begin connecting the dots.

Dr. Kellman was the only doctor that listened to me and did not dismiss the medical issues I was facing at the time. While under his care, I conceived twice and gave birth to my two sons.
Patient since 2015
I came in complaining of bloating and digestive pain. Dr. Kellman immediately provided me a test that no other doctor had done, and has slowly gotten rid of almost all of my issues.
Patient, digestive health
Each visit leaves me more educated in health and wellness. Dr. Kellman and his staff are professional, caring, and advanced in treatments that most doctors do not have.
Long-term patient
Dr. Kellman treats the core of complex health issues rather than just medicating the symptoms.
Patient, fibromyalgia
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You've been treating the symptoms.

It's time to look deeper.

Discover how Dr. Kellman's Microbiome Medicine approach can help investigate the interconnected factors that may be contributing to your health concerns.

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New York City  •  In-Person & Telehealth