Dr. Brian Greenberg - Immunologist and Allergist | 1MD Nutrition™

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Dr. Brian Greenberg

Allergy & Immunology

Dr. Brian Greenberg is an immunologist, allergist, and pediatrician who received his medical degree from the University of Florida, and completed his residency and fellowship at UCLA. He has practiced medicine in Southern California for almost 25 years.

Hi, I am Dr. Brian Greenberg. I have spent almost 30 years helping patients of all ages support their respiratory and immune health, as an immunologist and allergist. After completing medical school, I first trained in Pediatrics and then Allergy and Clinical Immunology at UCLA.  I now work out of Los Angeles in a private practice and for several years in a row, I have been named a Los Angeles Magazine “Top Doctor”.

It was during my time at medical school with long hours that I noticed how many people experienced common sores in their mouths. It was a recurring problem for myself, too. Common, over-the-counter remedies just didn’t work for me. My frustration with these prescription medications sent me on a path to find a simple and effective solution.

Spending days in the medical library extensively reading medical journals, I discovered mentions of the efficacy of probiotics, and then began experimenting with different probiotic strains, combined with other naturally-sourced ingredients. After numerous attempts and countless hours of research, I found the perfect combination of probiotic strains and other specific naturally-derived ingredients that helped support immune system function. 

Years later, patients of mine that presented with the same persistent typical sores reminded me of the probiotics I had discovered. I decided to create a proprietary formula from the highest-quality ingredients whose efficacy would never diminish. I searched for years for a manufacturer that would be able to develop a quality formula and this search brought me to 1MD Nutrition™.

Working closely with 1MD Nutrition™ researchers and their reputable team of physician formulators, we sought to deliver effective solutions for immune health. This led to development of ImmunityMD® probiotic-based formula and BreatheMD™ formula, two proprietary solutions unlike any we had encountered, which are manufactured at 1MD Nutrition’s FDA-approved facility, here in the United States.

ImmunityMD® is the only immune system-supporting formula for lip, skin, and oral health that contains a proprietary blend of health supporting probiotics. The blend of prebiotics and probiotics supports immune function by facilitating better absorption of nutrients in the gut. Nutraflora® Prebiotic, specifically, supports the growth of beneficial bacteria at the core of your immune system. 

With respiratory health being a major concern in the United States, we developed a formula specifically to address this growing issue. BreatheMD™ is a unique respiratory and immunity formula containing comprehensive dosages of vitamins C, D, and E, elderberry, zinc, chromium, L-cysteine, and marshmallow root. These naturally-sourced ingredients are added to Pelargonium sidoides, a revolutionary herb that has been known to help support a healthy immune system and proper lung function, so you get whole body health.


In my quest to stay cutting-edge and to provide the best possible care for my patients, I helped introduce groundbreaking therapies. Using my clinical experience, nutrition science research and superfoods from around the world, I have championed the use of naturally-derived methods to support the body’s own immune system to promote health and wellness. The safe and effective solutions we formulated are truly revolutionary immune and respiratory system supplements, free from unnecessary chemicals, additives, and common side effects. 

My partnership with 1MD Nutrition™ led to the formulation of effective and lasting solutions for immune and respiratory health. Our supplements combine highly bioavailable, naturally-sourced ingredients to aid the fight against environmental threats, help you support protective antioxidant activity, and maintain respiratory and immune system functions. We go beyond other supplements and address more than what meets the eye. We want to help you achieve optimal health and live a healthier and happier life.

Warmly, 

Dr. Brian Greenberg

Immunologist & 1MD Nutrition™ Physician Formulator

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As our leading expert Immunologist, Dr. Greenberg is the formulator of our groundbreaking immune-supporting supplements: ImmunityMD® and ImmunityMD® Plus.