As a long-time patient since 2015, I can attest to the outstanding skills of Dr. Jeffery Mark. I have observed first hand Dr. Jeffrey Mark possesses a heartfelt dedication to healing his patients to the best of their capabilities. It takes a doctor and patient to work together for healing to take place. This is a doctor you can trust. I put my life in his hands, and 4 yrs later I'm here to thank Dr. Jeffery Mark. As well as Dr. Fran Mark for taking care of protecting and strengthening my skin with well-researched products.

Barbra B.
Danville, CA
A patient since 2015-currently

Dr. Jeffrey Mark is absolutely the best doctor I have ever been to. He is incredibly knowledgeable in gastroenterology. His bedside manner is also exceptional. For months I have been suffering from debilitating stomach pains, unexplained sensitivity to any food that I ate, and other symptoms. I have been under Dr. Jeffrey Mark's care for a few months now and I am glad to say I have made an incredible recovery. Not only have my gastrointestinal symptoms subsided but I am now overall a healthier person. Dr. Jeffrey Mark's unique approach to patient care is unlike anything I have ever seen before, using a combination of his own natural medication and prescription medication in order to resolve my gastrointestinal issues. I would 100% recommend Dr. Jeffrey Mark to anyone looking for a genuinely great doctor that specializes in gut health.

Bryan Z.
Stockton, CA
2020

The supplements they offer are really AMAZING. I'm currently taking the M5 shake. I love to take it for breakfast and/or for lunch. It has a great Vanilla taste, and I also like to mix it with my fruit smoothies which add a delightful taste. Even better it is a VEGETABLE-BASED PROTEIN! Can't go wrong with any of the products they offer. Would really recommend everyone to give them a try, especially the M5. Thank you for the wonderful products and I can't wait to get more.

Angela R.
Modesto, CA
A patient since 2020-currently

My experience with Dr. Mark was outstanding. I was referred to Dr. Mark by my ENT and I knew immediately that I was in good hands. He really took the time to listen to my concerns and he answered all of my questions. I was very impressed by the amount of time and the personal attention that I received. I did not feel rushed nor did he make me feel bad for asking so many questions. He was so kind and patient with me and I really appreciate the follow-up that I received from him and his office.

Jeanne Q.
Danville, CA
A patient since 2014-currently

Dr. Mark has really helped me to have a happy gut at last! I highly recommend his services. This has also been the best practice I've been to where you are always greeted with a smile from all members of the staff. At the front desk is Mimi. She is very pleasant and helpful. Dr. Mark has such a positive spirit about him. I appreciate all the knowledge he's shared with me on how to make smarter food choices for my body's benefit. Many thanks, Dr. Mark!

Crissi E.
San Ramon, CA
2020

I am truly impressed with Dr. Mark's professionalism and knowledge. He is so well-versed in functional medicine and was able to explain things to me in very simple and understandable terms. He takes the time to get to know your issue and get to the root cause of your problems. Dr. Mark also has a fantastic bedside manner. He and his wife Dr. Frances make an excellent team. I highly recommend them.

Ray G.
Los Angeles, CA
2020

I highly recommend Dr. Mark. He helped me, not only reduce 20 pounds of weight I had been struggling to lose.
I now have a better gut, more energy, and an overall sense of well-being.

Jani B.
Turlock, CA
A patient since 2021-currently

Dr. Mark cares so much about getting his patients well, not covering up symptoms with prescriptions. I would highly recommend Dr. Mark and his caring staff. I have referred many friends and they are all equally happy and feeling better. I know Dr. Mark saved my Mom-in-law's life. I would give Dr. Mark and his staff all five stars.

Cheryl O.
Modesto, CA
A patient since 2020-currently

Dr. Mark is helpful with my stomach pain and inflammation. Great that he made tele sessions available during COVID isolation.

David W.
Danville, CA
2020

We have been going to Dr. Mark for over 15 years, and his care and dedication have always been exceptional. He is incredibly caring, takes the time to listen attentively, and ensures we fully understand our health and treatment options. Dr. Mark provides detailed feedback on tests and any necessary follow-ups, which gives us great confidence in his expertise.

I have recommended Dr. Mark to family and friends because of the trust and respect he has earned through his consistent, compassionate care. He is truly and outstanding physician.

Mike Lederer
2024