Get to the root of your symptoms so you can feel your best again

We dig deep to uncover what actually causes disease. Start your journey to health today with our comprehensive Adaptation Program. Aren’t you ready to finally feel better?

What We Do

Dr. Osgood is determined to change healthcare one patient at a time. He has helped thousands of people transform their lives and defeat the most challenging of situations by restoring their body’s natural ability to heal.

Uncover the Root cause

We dig deep to find the root cause of your symptoms with advanced lab testing and an in-depth lifestyle review.

Treat Collaboratively

We partner with you to create a personalized protocol with dietary, lifestyle, and supplement strategies and provide accountability and support every step of the way.

Transform Your Life

Our model is geared toward long-term results. We provide ongoing support and tools you can use for life to optimize your health and recover from setbacks.

Testimonials From Patients


With diligence and support, following the plan we put together with Dr. Osgood, I’m overjoyed to report my Graves’ Disease is now in full remission!


I wouldn’t have made the progress I have without becoming a patient at GrassRoots and am so happy to be on the path to recovery. In addition to regular appointments, I have access to the whole team for updates, questions, medication changes and other resources, tools and guidance. I no longer feel alone on this journey, GrassRoots is with me supporting me every step of the way.


After almost a decade of chronic illness, pain and autoimmune issues that should have been under control given my constant care under specialists and physicians alike, nothing ever resolved nor helped and my quality of life was extremely poor. That all changed after seeing Dr. Osgood. Functional medicine SAVED my life.


I’ve gone from barely being able to get through each day to enjoying things that I am passionate about again!


Dr. Osgood took my entire medical history into account – the body, my mental state and support structures, and emotional well-being. 


After a year or more of increasing misery and worsening symptoms, I finally began to feel better.


After months of struggling with pediatric Long Covid, Dr. Seth Osgood and the full team of specialists at Grassroots Functional Medicine has transformed my son’s health and continues to show our family that chronic illness need not define one’s life. In my son’s words, “We need to dedicate a building or a tree to this guy!”

Want to learn more about how we are transforming the lives of our patients? Let’s connect.

Why Choose GrassRoots Functional Medicine?

Too often, people think of “wellness” in temporary terms. They want to work with doctors and take short-term steps to improve their life and “wellness”… but often fall back into their unhealthy routines once their treatment finishes and end up right back where they started.

After years of seeing this happen with patients, Dr. Osgood wanted to open a clinic that not only helped patients reclaim their health and improve their overall wellness, but also give them the tools to continue their progress long after they have left the clinic for good.

Conditions We Treat

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.

A Team of Experts

A collaborative relationship between our patients and our team of practitioners is an integral part of the GrassRoots Functional Medicine approach. Our providers serve as your guide, helping navigate your journey to wellness.

Kari’s Success Story: From Hopeless to Hopeful

Kari’s Success Story: From Hopeless to Hopeful

Kari was told by her rheumatologist when she refused to continue the drugs he prescribed her, that there was no other way. Thankfully, Kari didn’t accept these grim predictions. Instead, they inspired her to seek out a different approach. An approach that would help her reclaim her health and vitality. 

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4 Dietary Do’s and Don’ts for Boosting Energy

4 Dietary Do’s and Don’ts for Boosting Energy

Food is fuel, and what you eat has a massive impact on how energetic you feel throughout the day. If you fuel your body with less than optimal foods or not enough, it can leave you feeling drained, exhausted, and cravings short-term energy boosts like sugar and caffeine. 

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How Can Hyperbaric Oxygen Help with Mold Toxicity?

How Can Hyperbaric Oxygen Help with Mold Toxicity?

If you’re like most people, you probably think of mold as that slimy stuff that grows on bread that’s been left out for too long. While it is true that mold can be found in many places – both indoors and outdoors – not all mold is created equal. In fact, some types of mold can be extremely harmful to your health, especially if you’re exposed to high levels of it for an extended period of time.

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Common Causes of Bloating and How to Address It

Common Causes of Bloating and How to Address It

Bloating is no fun. That overly full, distended, even painful feeling after eating can make you pretty miserable and interfere with getting through your days with energy and joy. Many people experience occasional bloating, and for those with digestive conditions like IBS, the vast majority suffer from frequent bloating. You shouldn’t ignore this symptom and just try to live with it.

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GrassRoots Functional Medicine Locations

New Hampshire

1 Oak Ridge Road
West Lebanon, NH 03784

Vermont – Hybrid

Visit our New Hampshire office, see us virtually, or do a combination of both!

Virtual – Texas, Oregon & Florida

Get the same transformative results with video appointments via our telemedicine platform!