Heal and Reset Your Gut
Reclaim Your Health
Transform Your Life

All diseases begin in the gut ~ Hippocrates

Optimize Your Whole Body

Achieving balance in your body, mind, and spirit is essential for overall well-being. When one aspect of your being is out of balance, it can affect the other 2, leading to physical, mental, and emotional stress.

By achieving harmony in all three areas, you can enhance your physical health, increase mental clarity and focus, and cultivate a sense of inner peace and calm. This can lead to improved relationships, better decision-making, and a more fulfilling life.

Are You Struggling With Any Of These Symptoms?

Chronic gut issues can manifest in various symptoms:

Bloating, Constipation
& Diarrhea.

Leaky Gut, IBS, SIBO

Food Sensitivities
& Allergies

Inability To Lose Weight

Chronic Fatigue Inflammation

Brain Fog

Candida, Mold &
Stealth Infections

Anxiety, Depression
& Sleep disorder

Covid Long-Haul Recovery


Work With The Real Gut Doctor

The Real Gut Doctor, under the leadership of Dr. Jeffrey C.G. Mark, MD, who has received five board certifications, uses cutting-edge technology to help patients regain their health and enhance their quality of life.

The Real Gut Doctor, under the leadership of Dr. Jeffrey C.G. Mark, MD, who has received five board certifications, uses cutting-edge technology to help patients regain their health and enhance their quality of life.

The Real Gut Doctor is a pioneering medical clinic that offers individualized care in regenerative medicine, functional medicine, metabolic medicine, healthy aging, and functional gastroenterology. The cutting-edge clinic provides comprehensive, individualized care to patients in San Ramon, Menlo Park, Turlock, California, Chicago, and Illinois. Patients can access our Telehealth services from anywhere in the world.

Patients are always given various options, including non-drug and minimally invasive procedures and all the information they need to make educated decisions.

Platelet-rich plasma for anti-aging, bio-identical hormone replacement therapy for hormonal imbalances, drug-free options for chronic pain and sleep management, and stress reduction are just a few examples of how we aim to treat the underlying causes of your health problems rather than just the symptoms.

The Real Gut Doctor has the answer if you have a medical question.

Dr. Mark creates tailor-made treatment plans for his patients that consider their unique requirements and preferences while maximizing their chances of a positive clinical outcome.

Pharmaceuticals, nutraceuticals, natural drug-free therapies, peptides, bio-identical hormone replacement therapies, platelet-rich plasma and bio-cellular treatments, energy medicine, and minimally invasive procedures are common components of his patient-centered, science-based approach.

Assessing GI Health Imbalances

Dr. Mark is equipped with various diagnostic and therapeutic methods to address gastrointestinal (GI) dysfunction.

Using the tried-and-true 5R method (Remove, Replace, Reinoculate, Repair, and Rebalance).

In this phase, harmful organisms are eliminated, and toxic, inflammatory, and allergenic foods are avoided.

The conventional method involves adding a prescribed medication to the body. Still, in many cases, the most effective treatment for our gastrointestinal tract involves getting rid of the offending substance and giving the system some time to rest.

Dr. Mark can help you with the subsequent steps of Replace (with digestive aids), Reinoculate (with probiotics), and Repair (with peptides) after the crucial Remove step.

Solve the Root problem

We examine you to identify the underlying causes of your ongoing health issues.

Feel Like Yourself Again

Most people spontaneously restore their energy, attention, and intestinal health within a relatively short period

Experience True Health

Incorporating an integrative strategy into treatment can lead to profound and long-lasting recovery.

All Roads Lead To The Gut

Heal your gut, and heal your body with our comprehensive GUT HEALING PROGRAMME.

Let us show you how to naturally improve your energy, attention, and gut health to help eliminate your digestive troubles.

Step 1:

Schedule an appointment for initial intake and assessment.

Step 2:

Book monthly or quarterly lab testing.

Step 3:

Get Monthly Assessment & Nutrition, Supplements 7 Peptides Plan

Step 4:

Execute 5R Program Monitor Monthly Progress

Step 5:

Follow up with monthly health roadmap

Step 6:

Rebalance the gut, microbiome, cellular health, hormones, nervous system

About Dr. Mark

Dr. Mark has over 2 decades of proven track record of helping patients regain their health, mental clarity, physical well-being, and overall vitality by repairing their gut. He achieves this using a highly personalized approach that includes diet, supplements, lifestyle changes, and peptides. 

Many patients who have seen multiple doctors without results have benefited from Dr. Mark’s expertise. Don’t wait any longer to look and feel your best.

 Contact Dr. Mark today to schedule a consultation and start your journey towards optimal health and well-being.

What our clients are saying

When you work with The Real Gut Doctor, you'll have access to a whole staff focused on your recovery.

Visit us at any one of
our three locations


11 Deerwood Road #168
San Ramon,
CA 94583


Monday to Friday – 9am to 5pm

Menlo Park, CA

21 Willow Road
Menlo Park
CA 94025


Monday to Friday – 9am to 5pm

Turlock, CA

2101 Geer Road #118
Turlock, CA 95382



Monday to Friday – 9am to 5pm

& Health Blog

Are you ready to embark on a transformative journey towards optimal health and well-being? This is your ultimate destination for the latest insights, expert advice, and practical tips on nutrition and holistic health.

Our blogs are dedicated to empowering you with the knowledge you need to make informed choices about your diet, lifestyle, and overall health.

Start Your Health Journey Today

Do you have questions about resuming a healthy lifestyle? To help you decide if our method is right for you, our online patient coordinator is available now to answer any questions you may have.