Top Thyroid Doctor in New York City
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.
Why Your Thyroid Makes All the Difference
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.
Thyroid Restoration Begins with Precision Testing
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.
Why You Feel Bad When the Thyroid Is Out of Balance
Thyroid dysfunction can affect nearly every system of the body. Patients often describe feeling unlike themselves:
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Tired
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Unmotivated
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Brain fog
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Thinning hair
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Dry skin
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Sensitivity to cold
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Weight fluctuations
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.
Thyroid Conditions We Treat
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.
Hypothyroidism
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.
Hyperthyroidism
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.
Hashimoto’s Thyroiditis
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.
Non-Thyroidal Illness Syndrome (NTIS)
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.
How Dr. Kellman Helps
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:
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.
Why Do I Have a Thyroid Issue?
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:
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Chronic stress, which disrupts hormone production and conversion.
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Nutrient deficiencies in selenium, zinc, iron, or iodine that impair thyroid function.
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Environmental toxins such as heavy metals, pesticides, and endocrine disruptors.
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Autoimmune activity, where the body mistakenly attacks thyroid tissue.
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Gut dysbiosis, or imbalance in the gut microbiome, which interferes with hormone regulation and immune health.
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.
The Gut-Thyroid Connection
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.
Choose Dr. Kellman for Thyroid Care in New York City
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.