Restore Your Health

Root Cause Resolution for Complex Conditions

At GrassRoots our goal is to uncover the root cause of your health challenges and implement solutions that restore your health for good.

We look beyond symptoms and diagnoses to see the whole picture.

We take a deep dive into your history, environmental factors such as nutrition, toxin exposures, gut health, and stress, and use comprehensive testing.

From there, we develop a personalized treatment protocol to address your specific root causes using dietary and lifestyle changes.

We implement targeted nutritional supplements and medications only where needed, based on what your testing reveals.

True health transformation depends on having the right mindset, ongoing support, and a clear path back to wellness.

That’s why we focus on providing clarity and guidance every step of the way.

We’ve helped hundreds of patients struggling with autoimmune disease, thyroid dysfunction, chronic fatigue, IBS, Lyme, and other chronic conditions.

Learn more about the GrassRoots Adaptation Program!

Seth Osgood - Functional Medicine

Meet Dr. Seth Osgood

Dr. Osgood discovered Functional Medicine was his true passion after it transformed his own health and the health of his family.

He has completed extensive post-graduate studies, is an Institute for Functional Medicine Certified Practitioner (IFM-CP), and trained under Functional Medicine expert, Dr. Amy Myers at her clinic.

Dr. Osgood went on to found GrassRoots Functional Medicine, expand to multiple clinics in New England, and has helped hundreds of patients reclaim their health for good!

Root Cause Resolution for Complex Conditions

At GrassRoots, we uncover the root cause of your health challenges and implement solutions that restore your health for good.

We look beyond symptoms and diagnoses to see the whole picture. 

We take a deep dive into your history, environmental factors such as nutrition, toxins, and stress, and use comprehensive testing.

From there, we develop a personalized treatment protocol to address your specific root causes using dietary and lifestyle changes.

True health transformation depends on having the right mindset, ongoing support, and a clear path back to wellness. That’s why we provide clarity and guidance every step of the way.

We’ve helped hundreds of patients struggling with autoimmune disease, thyroid dysfunction, chronic fatigue, IBS, Lyme, and other chronic conditions.

Book your free discovery call to learn more!

Seth Osgood - Functional Medicine

Meet Dr. Seth Osgood

Dr. Osgood discovered Functional Medicine was his true passion after it transformed his own health and the health of his family.

He has completed extensive post-graduate studies, is an Institute for Functional Medicine Certified Practitioner (IFM-CP), and trained under Functional Medicine expert, Dr. Amy Myers at her clinic.

Dr. Osgood went on to found GrassRoots Functional Medicine, expand to multiple clinics in New England, and helped hundreds of patients reclaim their health for good!

Who can benefit from Functional Medicine?

Thyroid & Hormone Balance

Hypothyroid, Hyperthyroid, Hashimoto Thyroiditis, Menopause, Hormone Replacement, PMS, Adrenal Fatigue, Low Libido, Erectile Dysfunction, etc.

Digestive Health & Nutrition

IBS, Food Sensitivites & Allergies, Constipation, Diarrhea, Candida or Yeast Overgrowth, Small Intestine Bacterial Overgrowth (SIBO), Bloating, Indigestion, GERD, Parasites, etc.

Autoimmune & Inflammation

Lyme Disease, Hashimoto Thyroiditis, Graves Disease, Lupus, Rheumatoid Arthritis, Sjogrens, Multiple Sclerosis, Crohns, Ulcerative Colitis, Type 1 Diabetes, Psoriasis, Environmental Illness (Mold/Mycotoxins), etc.

Lyme Disease & Tick Borne Illness

Holistic & Conventional treatments of Lyme Disease & Tick Associated Co-infections.

Cardiovascular & Metabolic Health

High Blood Pressure, High Cholesterol, Heart Disease, Diabetes, Stroke, TIA, Low Blood Pressure, POTs, etc.

Energy & Brain Health

Depression, Anxiety, Chronic Fatigue Syndrome (CFS), Weight Gain, Fibromyalgia, Chronic Pain, Dementia, Insomnia, etc.

Penny Sirjane
Penny Sirjane
22:14 15 Oct 19
Superb staff, a complete holistic approach to a deeper level of healthcare other than writing scipts . Amazing!
Mary Hanson
Mary Hanson
14:53 18 Sep 19
Having an a chronic illness can affect every single aspect of your life and leave you feeling extremely isolated. If you are ready to make a change and take control, Dr. Seth Osgood and his team of health professionals will be there to provide diagnosis, care and support during good and bad times. They are very responsive and proactive with "whole" patient care. You won't slip through the cracks at GrassRoots. You will see progress in the best way possible. Very greatfull to this group for giving me my life back.read more
Deb Reynolds
Deb Reynolds
17:08 17 Sep 19
Wow! After years with a chronic disease leaving me with no energy and constantly fatigued, its a relief to finally find GrassRoots Functional Medicine. I feel amazing! Thank You Dr Osgood and staff.read more
Xaviera Hookway
Xaviera Hookway
13:23 11 Apr 19
Dr. Seth continues to give me hope on my health journey. He is thorough and creative, considering all areas of my life, not just my symptoms. During my last visit, he asked me if my latest pharmaceutical seemed to be making a difference. When I replied that I couldn’t tell, he said, “alright let’s take you off it then. I mean, the goal is not to be on anything.” It surprised me, since in my experience with medical doctors, the response would have been, “well let’s try a little longer, and see what happens.” Clearly, Seth is not in it for the pharmaceutical kickbacks he can get, he is concerned for MY welfare. His background and experience give me confidence and I’m so grateful to have a care provider like him who is not giving up on my health.read more
jamie carey
jamie carey
03:47 20 Dec 18
Dr. Osgood has been integral in my healing journey. I have recovered from severe eczema on my hands and face largely due to his fantastic care and support. I highly recommend his care to anyone who is looking to heal from the inside out. Dr. Osgood does discover root causes of illness and provides a solid plan towards recovery.read more
Danielle Glenn
Danielle Glenn
17:39 26 Mar 18
Dr. Osgood is amazing-he develops your treatment plan with you, listening to your concerns and questions. He and his staff are so responsive and helpful. I'm so grateful for all the work they do!read more
Anne I. Ryan
Anne I. Ryan
15:05 25 Mar 18
Seth has many qualities of an ideal healthcare practitioner: knowledgeable, dedicated, thorough, compassionate, well-researched, positive, and a great listener, to name several. He has helped me work through some challenging health issues and reach a level of wellness I know I never would have achieved in the conventional system. He is also very willing to help with quick questions between appointments, offering a high level of support which is critical to long-term success. I highly recommend GrassRoots Functional Medicine to get to the root of your health issues!read more
Mariana Gariazzo
Mariana Gariazzo
15:15 23 Mar 18
Dr. Osgood is a caring, sensitive, an authentic human being whose mission is clearly to empower people to be the best version of themselves. I feel immense gratitude for having found such knowledgeable functional doctor in my life! He has helped me resolve and overcome a very difficult health challenge. He possess expertise that actually finds the root cause of health problems to truly heal! I recommend GrassRoots with all my heart!read more
Kathryn Kirkham
Kathryn Kirkham
03:46 23 Mar 18
I have been battling ME/CFS and autoimmune disease for 5 years. I lost all of my energy and enthusiasm. Most days I was consumed with “brain fog” and chronic systemic inflammation that prevented me from having enough energy or focus to work. I sought help from countless doctors without resolution. I was so relieved to find Dr. Osgood! He has multiple certifications within the field of functional medicine. He took my entire medical history into account and considers the body, mind and spirit as a whole. His unique approach to treatment is exemplified by the utmost thoroughness, compassion, and enthusiasm! Dr. Osgood solved the mystery of my complex illness by uncovering the root causes behind my diseases. His treatment plan has me well on the path toward healing. This will be the first year in several that I can resume my passion - hiking in the mountains! I am so grateful for his care!read more
Next Reviews
Penny Sirjane
Penny Sirjane
22:14 15 Oct 19
Superb staff, a complete holistic approach to a deeper level of healthcare other than writing scipts . Amazing!
Mary Hanson
Mary Hanson
14:53 18 Sep 19
Having an a chronic illness can affect every single aspect of your life and leave you feeling extremely isolated. If you are ready to make a change and take control, Dr. Seth Osgood and his team of health professionals will be there to provide diagnosis, care and support during good and bad times. They are very responsive and proactive with "whole" patient care. You won't slip through the cracks at GrassRoots. You will see progress in the best way possible. Very greatfull to this group for giving me my life back.read more
Deb Reynolds
Deb Reynolds
17:08 17 Sep 19
Wow! After years with a chronic disease leaving me with no energy and constantly fatigued, its a relief to finally find GrassRoots Functional Medicine. I feel amazing! Thank You Dr Osgood and staff.
Xaviera Hookway
Xaviera Hookway
13:23 11 Apr 19
Dr. Seth continues to give me hope on my health journey. He is thorough and creative, considering all areas of my life, not just my symptoms. During my last visit, he asked me if my latest pharmaceutical seemed to be making a difference. When I replied that I couldn’t tell, he said, “alright let’s take you off it then. I mean, the goal is not to be on anything.” It surprised me, since in my experience with medical doctors, the response would have been, “well let’s try a little longer, and see what happens.” Clearly, Seth is not in it for the pharmaceutical kickbacks he can get, he is concerned for MY welfare. His background and experience give me confidence and I’m so grateful to have a care provider like him who is not giving up on my health.read more
jamie carey
jamie carey
03:47 20 Dec 18
Dr. Osgood has been integral in my healing journey. I have recovered from severe eczema on my hands and face largely due to his fantastic care and support. I highly recommend his care to anyone who is looking to heal from the inside out. Dr. Osgood does discover root causes of illness and provides a solid plan towards recovery.read more
Danielle Glenn
Danielle Glenn
17:39 26 Mar 18
Dr. Osgood is amazing-he develops your treatment plan with you, listening to your concerns and questions. He and his staff are so responsive and helpful. I'm so grateful for all the work they do!
Anne I. Ryan
Anne I. Ryan
15:05 25 Mar 18
Seth has many qualities of an ideal healthcare practitioner: knowledgeable, dedicated, thorough, compassionate, well-researched, positive, and a great listener, to name several. He has helped me work through some challenging health issues and reach a level of wellness I know I never would have achieved in the conventional system. He is also very willing to help with quick questions between appointments, offering a high level of support which is critical to long-term success. I highly recommend GrassRoots Functional Medicine to get to the root of your health issues!read more
Mariana Gariazzo
Mariana Gariazzo
15:15 23 Mar 18
Dr. Osgood is a caring, sensitive, an authentic human being whose mission is clearly to empower people to be the best version of themselves. I feel immense gratitude for having found such knowledgeable functional doctor in my life! He has helped me resolve and overcome a very difficult health challenge. He possess expertise that actually finds the root cause of health problems to truly heal! I recommend GrassRoots with all my heart!read more
Kathryn Kirkham
Kathryn Kirkham
03:46 23 Mar 18
I have been battling ME/CFS and autoimmune disease for 5 years. I lost all of my energy and enthusiasm. Most days I was consumed with “brain fog” and chronic systemic inflammation that prevented me from having enough energy or focus to work. I sought help from countless doctors without resolution. I was so relieved to find Dr. Osgood! He has multiple certifications within the field of functional medicine. He took my entire medical history into account and considers the body, mind and spirit as a whole. His unique approach to treatment is exemplified by the utmost thoroughness, compassion, and enthusiasm! Dr. Osgood solved the mystery of my complex illness by uncovering the root causes behind my diseases. His treatment plan has me well on the path toward healing. This will be the first year in several that I can resume my passion - hiking in the mountains! I am so grateful for his care!read more
See All Reviews

Book Your Free Discovery Call to Get Started

Schedule your 10-minute consult with Dr. Seth Osgood to review your history, discuss your goals, and determine if you’re a good fit for our Adaptation Program!