- Shop
- Call Us
When it comes to thyroid health, few doctors offer the depth of understanding and the level of precision that Dr. Raphael Kellman can. He is known as a pioneer in functional and microbiome medicine, and armed with this experience, he helps patients uncover the real causes behind fatigue, weight gain, mood changes, and countless other symptoms that stem from thyroid dysfunction.
At our New York City clinic, you receive the care you deserve. Each treatment plan is comprehensive, personalized, and based on the latest science. Let’s finally restore your thyroid function.
The thyroid regulates metabolism, energy production, temperature, and even emotional balance. When thyroid function is impaired, the effects ripple outward—disrupting digestion, sleep, cognition, and hormonal balance.
Dr. Kellman has seen countless patients who have spent years searching for answers. They’ve been told their labs are “normal” while they continue to feel exhausted, foggy, and unwell. The problem often lies in the limitations of standard thyroid testing, which can miss subtle dysfunctions that impact how thyroid hormones are produced, converted, and utilized.
Dr. Kellman’s protocols aren’t just supplement sales or a single session of red light therapy. His work involves deep, investigative medicine—unpacking the layers of chronic and complicated illness to reveal what’s truly happening in the body. He listens carefully, tests comprehensively, and treats holistically, using science-backed therapies that restore balance to the thyroid, the gut, and the body as a whole.
Dr. Kellman utilizes a highly advanced and precise thyroid test, the TRH Stimulation Test. This test detects low thyroid function with much greater accuracy than traditional panels. This test, often unknown and underutilized by other doctors, provides insights into the body’s metabolic and hormonal function. It has changed the lives of patients who finally received an accurate diagnosis after years of frustration and misdirection.
With this level of diagnostic precision, Dr. Kellman can tailor treatments that address the true cause of thyroid dysfunction rather than masking symptoms. This is what sets him apart as one of New York City’s top thyroid specialists in functional medicine.
Thyroid dysfunction can affect nearly every system of the body. Patients often describe feeling unlike themselves:
You might also experience digestive issues such as bloating, constipation, or irregularity. Emotionally, thyroid imbalance can manifest as anxiety, irritability, or a low mood that doesn’t respond to lifestyle changes. Over time, these symptoms can erode confidence, energy, and overall quality of life.
At our New York City clinic, thyroid care is never one-dimensional. Dr. Kellman addresses the full spectrum of thyroid disorders using advanced testing and an individualized treatment plan.
When the thyroid doesn’t produce enough hormones, metabolism slows and energy production drops. Dr. Kellman identifies the underlying causes—nutrient deficiencies, autoimmune activity, or poor hormone conversion—and restores balance naturally. This is the most common type of thyroid issue in New York City and nationally.
An overactive thyroid speeds up metabolism and can lead to anxiety, rapid heartbeat, sweating, and unexplained weight loss. Dr. Kellman focuses on regulating immune activity and calming inflammation to bring the thyroid back into balance.
As an autoimmune condition, Hashimoto’s requires a comprehensive approach that goes beyond hormone replacement. Dr. Kellman addresses the immune system, inflammation, and gut health to reduce autoantibody activity and support long-term healing.
Sometimes thyroid function is disrupted even when the gland itself is healthy. Known as NTIS, this condition occurs when stress, chronic illness, or inflammation interfere with hormone conversion and signaling. Through advanced testing, Dr. Kellman pinpoints the metabolic imbalances and supports the body’s ability to self-regulate.
Much of Dr. Kellman’s success at healing his patients is due to his 30 years of medical experience, combined with his innovative and unique treatment options available, such as:
Dr. Kellman utilizes bioidentical hormones, which include both types of thyroid hormone—T4 and T3. Most conventional thyroid medications, such as Synthroid, only contain T4, the inactive form. This approach is often less effective because T4 must be converted into the active form, T3, for the body to use it properly. Many individuals with thyroid dysfunction experience conversion issues, meaning they may continue to struggle with fatigue, brain fog, and slow metabolism even when taking T4-only medications. By using formulations that include both T4 and T3, Dr. Kellman ensures that each patient receives balanced and fully active thyroid hormone support.
Dr. Kellman incorporates natural compounds and nutraceuticals that reduce inflammation—the root cause of many chronic health issues, including thyroid dysfunction. These science-backed supplements help calm the immune system, support thyroid tissue repair, and restore normal cellular communication. By addressing inflammation at its source, patients experience improved energy, focus, and hormonal balance.
The health of the gut microbiome directly impacts thyroid function. Dr. Kellman uses targeted probiotics that contain specific strains of beneficial bacteria shown to support immune balance, hormone regulation, and nutrient absorption. These probiotics are carefully selected based on each patient’s microbiome profile, ensuring a personalized and effective approach to restoring gut health and thyroid function.
Healing the thyroid begins with restoring gut harmony. Dr. Kellman develops an appropriate combination of probiotics, prebiotics, and dietary adjustments to rebalance the gut microbiome. This process strengthens the intestinal lining, improves nutrient assimilation, and reduces the autoimmune triggers that often contribute to thyroid dysfunction. By re-establishing microbial balance, the body becomes better equipped to regulate metabolism and hormone activity naturally.
To further protect thyroid and cellular health, Dr. Kellman prescribes specific antioxidants that target inflammation and oxidative damage. Oxidative stress can impair thyroid hormone production and worsen autoimmune responses. These antioxidants neutralize free radicals, enhance mitochondrial function, and help repair cellular damage caused by chronic stress or environmental toxins.
IV therapy delivers essential nutrients and natural compounds directly into the bloodstream, bypassing the digestive system for maximum absorption and effectiveness. This method ensures that the body receives optimal levels of vitamins, minerals, and antioxidants necessary for thyroid function, energy production, and cognitive clarity. Several of the compounds Dr. Kellman uses can cross the blood-brain barrier, directly reducing inflammation and alleviating brain fog—common symptoms associated with thyroid imbalance.
Dr. Kellman incorporates peptide therapy, using small, naturally occurring proteins that act as signaling molecules within the body. These peptides help reactivate dormant or underperforming cells, restoring optimal communication and function within the thyroid and immune systems. Peptide therapy supports tissue regeneration, hormone balance, and improved cellular metabolism, helping patients achieve deeper healing at the molecular level.
The Magnesphere is a cutting-edge therapeutic device that helps the body enter its parasympathetic state—the mode responsible for rest, repair, and healing. This technology uses low-level electromagnetic fields to promote relaxation, reduce stress, and enhance circulation. By shifting the body away from chronic stress (the “fight or flight” state), Magnesphere therapy enables more efficient thyroid hormone utilization and overall physiological recovery.
At the core of Dr. Kellman’s thyroid and gut healing approach is nutrition and lifestyle support. His signature Microbiome Diet is designed to nourish and balance the gut microbiome, which plays a central role in hormone regulation, metabolism, and immune health. This dietary program focuses on whole, unprocessed foods that reduce inflammation, restore gut diversity, and enhance energy levels. Combined with lifestyle guidance on sleep, stress reduction, and movement, Dr. Kellman helps patients create sustainable habits that lead to long-term thyroid and metabolic balance.
When appropriately combined, these innovative treatments provide powerful synergistic effects. Our goal is to use these therapies to activate and accelerate the body’s own ability to heal itself.
Thyroid dysfunction rarely occurs “out of the blue.” It is often the result of a complex interaction of factors—many of which are missed in conventional medicine. Common contributors include:
Rather than focusing solely on thyroid hormone levels, Dr. Kellman investigates all of these factors through detailed testing and analysis. The goal is not just to improve lab results—but to restore full-body harmony.
One of the key insights from Dr. Kellman’s groundbreaking work in microbiome medicine is the strong relationship between gut health and thyroid function. The gut microbiome influences how the body converts inactive thyroid hormone (T4) into its active form (T3). When the microbiome is imbalanced or inflamed, this conversion process is disrupted—leading to symptoms that mimic thyroid underactivity.
Additionally, a compromised gut lining can contribute to autoimmune thyroid conditions like Hashimoto’s by allowing toxins and undigested particles to trigger immune reactions. By restoring the gut microbiome through targeted probiotics, personalized nutrition, and advanced therapies, Dr. Kellman helps patients experience measurable improvements in thyroid balance, energy, and mood.
Healing the gut isn’t just a digestive issue—it’s a thyroid solution.
Dr. Kellman’s reputation as one of New York City’s top thyroid doctors comes from his ability to help patients who have been dismissed, misdiagnosed, or told “nothing is wrong.” His funcitonal model combines the best of conventional endocrinology with the cutting-edge science of functional and microbiome medicine.
Because no two thyroid cases are ever the same, his goal is to understand the “why” behind each person’s symptoms and to guide them toward sustainable healing.
Schedule a consultation with Dr. Raphael Kellman at his New York City clinic and experience what it means to work with one of New York City’s top thyroid doctors. Discover how functional medicine and microbiome restoration can transform your thyroid health—and your life.
Dr. Raphael Kellman’s vast experience, expertise and intuition provide him with a unique vantage point from which he is able to help people heal and truly change the course of so many lives. He is a pioneer and leader in functional medicine who coined the term “Microbiome Medicine.” He has developed hundreds of treatment protocols based on microbiome health, which is the orchestrator of all of the body’s systems.
