Kendal Stewart, M.D.

A pioneer in clinical nutrigenomics, neurotology, and neuro-immune recovery. Dr. Stewart has dedicated over three decades to unlocking how specific genetic enzyme deficiencies impact energy, mood, digestion, and systemic inflammation.

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Kendal Stewart,
30+
Years Clinical Practice
110+
Podcast Episodes
10,000+
Patients Treated
25+
Doctor Formulations
Research & Publications

Published Studies & Clinical Protocols

Dr. Stewart's published literature spans neurotology, viral neuro-inflammation, otolaryngic allergy, and personalized nutrigenomic protocols.

Nutrigenomic Polymorphisms & Neuro–Immune Syndromes

Clinical Whitepaper

Evaluation of 5,000+ patient genetic profiles correlating MTHFR and Phase II liver SNPs with chronic neuro-sensory fatigue.

Transdermal Delivery of Liposomal Active Co–Factors

Published Research

Clinical pharmacokinetic assessment of transdermal reduced glutathione and methylated B-complex bypassing gut malabsorption.

The 3–Tiered Neuro–Sensory Recovery Protocol

Clinical Protocol

Physician guide on sequencing gut mucosal restoration, mitochondrial recharge, and methylation support.

Milestones

30+ Years of Medical Innovation

1988 - 1994

University of Texas Medical School at Houston

Neurotology / Skull Base Surgery fellowship

1996 - Present

Clinical Practice & Nutrigenomic Research

Established specialized practice in Austin, TX. Pioneered pre-methylated nutrient combinations to bypass MTHFR mutations.

2016 - 2020

GX Sciences & Neurobiologix

Co-founded CLIA-certified genomics lab and launched the weekly podcast educating thousands of physicians worldwide.

2026 – Present

NineTwo by Dr. Stewart

Launched direct-to-consumer at-home genetic panels and clinical formulas, putting personalized cellular health into every patient's hands.

Kendal Stewart, MD
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CLINICAL PHILOSOPHY
“We have treated medicine like a guessing game for decades. If you have an MTHFR or COMT mutation, standard off-the-shelf supplements don't just fail to work—they often overwhelm your biochemical pathways. Understanding your genetics gives us the exact coordinates to restore balance.”

Kendal Stewart, MD

Board-Certified Surgeon, Neurotologist & Founder of NineTwo
30+ Years Medical Surgery & Patient Care
Pioneer in MTHFR & Methylation Science
Host of “Coffee with Dr. Stewart” Podcast
200,000+ Engaged Organic Followers
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Watch: Why Most Multivitamins Fail
12-Min Masterclass by Dr. Stewart

From Skull Base Surgery to Cellular Biochemistry

Dr. Kendal Stewart completed his medical degree at the University of Texas at Houston Medical School, followed by specialty surgical residency in Otolaryngology / Head and Neck Surgery, and a sub-specialty fellowship in Neurotology & Skull Base Surgery.

Early in his surgical career, Dr. Stewart observed that many patients with complex dizziness, neuro-sensory deficits, severe fatigue, and neurological inflammation suffered from underlying biochemical imbalances that standard medicine was failing to address.

This drove him to pioneer the field of Clinical Nutrigenomics: sequencing patient DNA to identify single nucleotide polymorphisms (SNPs) in methylation, detoxification, and gut enzymes, and formulating targeted bioavailable nutrients to bypass these genetic roadblocks.

Medical Credentials & Leadership

M.D. Degree: University of Texas at Houston Medical School
Fellowship: Neurotology & Skull Base Surgery at Baylor
Host: "Coffee With Dr. Stewart" Weekly Podcast
Lead Formulator: NineTwo by Dr. Stewart & NBX Wellness
Founder: GX Sciences (Clinical Genomics Laboratory) & Neurobiologix

Treat the Biochemistry, Not Just the Symptom

Dr. Stewart's treatment paradigm rests on three interconnected pillars of cellular biology.

01

Bypassing Genetic Bottlenecks

If an individual has an MTR, or MTHFR polymorphism, their cells cannot convert synthetic vitamins. Dr. Stewart formulates pre-methylated, co-enzymatic nutrients that feed biochemical pathways directly.

02

Dual–Phase Liver Detoxification

Phase I liver detoxification generates dangerous reactive intermediates. Dr. Stewart balances Phase I with robust Phase II glutathione conjugation to clear heavy metals, mold, and environmental toxins safely.

03

The Gut–Brain–Immune Axis

Intestinal mucosal inflammation, histamine degradation failure (DAO deficiency), and bacterial overgrowth create systemic neuro-inflammation. Restoring gut barrier tight junctions is non-negotiable.

Coffee With Dr. Stewart

Hosted by Dr. Kendal Stewart and his daughter Courtney Stewart. Breaking down cutting-edge medical research on genetics, neuro-immunity, chronic illness recovery, and cellular nutrition.

27 min • May 24, 2021

New Findings To Help Those With Focus, Mood &...

Dr. Stewart discusses new findings in ADD/ADHD and mood issues and how we can naturally help those who suffer...

44 min • Nov 11, 2021

Understanding The Teenage Boy Brain, Key Genes...

Researchers have known for years that puberty not only changes your body, but also your brain...

37 min • July 6, 2022

Increase In Mental Health Issues & What Is Going On Post Pandemic...

Why Mental Issues Are Increasing & What Is Going On Post Pandemic In this episode we discuss with Dr. Stewart the increase in depression...

1 hr 3 min • Nov 08, 2022

The Teenage Girl Brain: Hormones, Challenges w/...

What is actually going on with young girls and teen girls before, during and after puberty...

23 min • Fe 15, 2023

Telomeres: What They Are and Why We Need To Pa...

In this episode we discuss with Dr. Stewart: What are telomeres and why are they important?

37 min • Sep 24, 2026

Dizziness, Vertigo, and Imbalance: What's Really...

People use the word "dizzy" to describe a lot of different things. Dr. Kendal Stewart explains why it matters to tell apart lightheadedness...

38 min • Oct 02, 2025

What Is TPE(Therapeutic Plasma Exchange) and Why It’s a Game Changer for Autoimmune and Brain Health

In this episode of Coffee with Dr. Stewart, we’re talking about therapeutic plasma exchange, or TPE...

59 min • Oct 08, 2025

Brain Fog Explained: Real Causes, Long COVID, Hormones, and How to Fix It

Do you ever feel like your brain just will not turn on? Brain fog is one of the most common complaints people bring to the doctor...

43 min • Feb 16, 2026

Dementia and Alzheimer's: Risk Factors, Prevention, and What's Happening in the Body

In this episode on dementia and Alzheimer's, Dr. Stewart discusses: How to identify risk, then mitigate it with lifestyle and nutritional changes...

59 min • Apr 03, 2026

Peptides in Medicine: Immune Support, Tissue Repair, Hormone Health, and Cognitive Function

In this episode, Dr. Stewart breaks down what peptides are, how they work...

40 min • Aug 19, 2026

PCOS to PMOS: Courtney's Story, Insulin Resistance, Autophagy Genetics, Hormone Conversion, & more.

In this episode, Dr. Stewart sits down with his daughter Courtney to break down PCOS ...

37 min • Sep 24, 2026

Dizziness, Vertigo, and Imbalance: What's Really Going On?

People use the word "dizzy" to describe a lot of different things. Dr. Kendal Stewart explains...

EP. 01 30 min • Sep 25, 2014

Dr. Stewart's Background & Expertise

Neurobiologix Supplements presents a medical support radio show called "Coffee With Dr. Stewart"...

EP. 02 27 min • Sep 25, 2014

Methylation...The Key To A Healthy Life & Why So Many People Are Deficient

Dr. Kendal Stewart and Host Kara Stewart-Mullens discuss Methylation and what it means to you and your family's health...

EP. 03 27 min • Oct 01, 2014

ADD / ADHD Alternative Treatments, Diagnosis & Long Term Side Effects of ADD Medications

Dr. Stewart will discuss in this episode the definition of ADD and ADHD and his thoughts around the growing number of children being diagnosed...

EP. 04 30 min • Oct 06, 2014

Headaches and Migraines: Causes & Treatment

Dr. Stewart discusses in episode 4 the biochemistry behind why someone may suffer from chronic headaches and migraines.

EP. 05 27 min • Oct 14, 2014

Anxiety & Depression Overview, Causes & Nutritional Suggestions

Dr. Stewart discusses anxiety, depression and other specific conditions that affect millions of children and adults today.

EP. 06 28 min • Oct 20, 2014

Sleep Issues & Tips To Support The Sleep-Wake Cycle For Better Rest

Dr. Stewart discusses why so many of us are having sleep troubles today. He goes over the importance of the SLEEP CYCLE...

Start Your Personalized Protocol

Experience Dr. Stewart's Clinical Formulations

Whether you test your genetics first or start with targeted doctor-developed supplements, give your body the exact cellular support it needs.

Frequently Asked Questions

Personalized wellness through genetic testing, education, and targeted supplementation.
Our advanced panel tests key enzymes including MTHFR and COMT to uncover pathway bottlenecks and optimize energy production.
Evaluates hepatic phase I and phase II clearance genes to optimize endogenous glutathione pathways and cellular detox.
A non-invasive cheek swab collected at home is analyzed at our CLIA-certified laboratory with results available in 2–3 weeks.
Comprehensive clinical panels engineered specifically to guide targeted nutrition, co-factor dosing, and bio-individual lifestyle protocols.
Yes, our bioavailable co-factor formulas are crafted specifically to bypass the exact SNP blocks identified in your panel.