Hormone Optimization Strategies You Need for Thyroid Health

Achieve optimal thyroid health with effective hormone optimization strategies. Take control of your well-being now.

Introductory Abstract

As Dr. Alexander Jimenez, DC, APRN, FNP-BC, CFMP, IFMCP, ATN, CCST, I often meet patients who tell me, “My thyroid labs are normal, but I still feel exhausted, cold, inflamed, foggy, constipated, anxious, or unable to lose weight.” This educational post explores why that can happen. I will explain the differences among TSH, free T4, and free T3; why T3 is the biologically active thyroid hormone; how stress and inflammation can reduce the conversion of T4 to T3; and why symptoms may persist even when a standard thyroid screening test appears normal.

I will also explain how our team at Injury Medical Clinic PA, also known as Mission Plaza Injury Medical Clinic, in El Paso, Texas, approaches thyroid-related symptoms through an integrative model. In our clinical setting, I provide chiropractic, functional medicine, rehabilitation, and personal injury care, while Dr. Maria Guadalupe Cardenas, MD, Board Certified in Internal Medicine, NPI #1164426749, Texas Medical License #J2933, serves as Medical Director and Collaborative Physician. With more than 40 years of experience as an internist, Dr. Cardenas provides medical oversight in a multidisciplinary care structure commonly used in integrative and injury care clinics.

Together, our goal is not to replace appropriate medical evaluation but to help patients understand the physiology behind their symptoms, identify contributing factors such as stress, metabolic dysfunction, nutrient depletion, inflammation, musculoskeletal pain, and autonomic nervous system imbalance, and develop coordinated care plans grounded in modern evidence-based research.

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Why I Look Beyond Standard Thyroid Screening When Symptoms Persist

In my clinical experience, one of the most common concerns I hear from patients is that they have persistent symptoms despite being told their thyroid is “normal.” Many patients arrive with fatigue, poor sleep, weight resistance, dry skin, thinning hair, constipation, low mood, anxiety, cold hands, cold feet, and muscle aches. They may have already had a basic thyroid test, usually thyroid-stimulating hormone, or TSH, and were told everything looked fine.

As a clinician trained in chiropractic, family nurse practitioner care, functional medicine, rehabilitation, and integrative health, I have learned that symptoms must be viewed in context. A single screening marker may be useful, but it does not always tell the whole story.

The thyroid system is not simply a gland producing a hormone. It is a complex network involving:

• The hypothalamus
• The pituitary gland
• The thyroid gland
• The liver
• The gut
• The immune system
• The adrenal stress response
• Mitochondrial energy production
• Cellular thyroid receptors
• Inflammatory signaling pathways

When patients have lingering symptoms, I want to understand whether the issue is primary thyroid disease, poor thyroid hormone conversion, inflammation, autoimmune activity, medication effects, stress physiology, nutrient insufficiency, metabolic syndrome, or a combination of these factors.

This is why I believe thyroid education is essential. Patients deserve to understand what their labs mean, what they do not mean, and why their symptoms should not be dismissed simply because a single marker falls within a broad laboratory reference range.

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Understanding TSH: What Thyroid-Stimulating Hormone Really Tells Us

TSH, or thyroid-stimulating hormone, is produced by the pituitary gland in the brain. Its primary job is to signal the thyroid gland to produce thyroid hormones. When circulating thyroid hormone levels are low, the pituitary typically releases more TSH to stimulate the thyroid. When thyroid hormone levels are high, the pituitary usually lowers TSH production.

This creates an inverse relationship:

• Low thyroid hormone output may raise TSH
• High thyroid hormone output may suppress TSH
• Normal circulating T4 may keep TSH in the standard range

TSH is very useful for detecting many cases of primary hypothyroidism, especially when the thyroid gland itself is underproducing hormone. It is also useful in identifying patterns that may suggest hyperthyroidism, in which the thyroid gland is overactive or excessively stimulated.

However, TSH is a screening marker, not a complete evaluation of thyroid physiology. A normal TSH does not always indicate optimal thyroid hormone action at the cellular level. The American Thyroid Association and other endocrine organizations recognize TSH as a major tool in thyroid assessment. Still, clinical interpretation must account for the patient’s symptoms, medications, comorbidities, and additional thyroid markers when appropriate (Jonklaas et al., 2014).

This matters because the patient does not feel the effects of TSH. The patient experiences the downstream effects of thyroid hormone availability, conversion, receptor signaling, mitochondrial energy production, and metabolic regulation.

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Free T4 and Free T3: Why Active Thyroid Hormone Matters

The thyroid gland primarily produces T4, also called thyroxine. T4 is often described as a prohormone because it has relatively limited direct metabolic activity compared with T3 (triiodothyronine).

The body must convert T4 into T3 through enzymes called deiodinases. These enzymes remove iodine atoms from thyroid hormones to activate or deactivate them. The conversion of T4 into T3 is especially important because T3 is the active thyroid hormone that binds to nuclear receptors inside cells and influences gene transcription.

T3 helps regulate:

• Basal metabolic rate
• Mitochondrial energy production
• Body temperature
• Lipid metabolism
• Carbohydrate metabolism
• Gut motility
• Heart rate and vascular tone
• Neurological function
• Mood and cognition
• Hair, skin, and nail health
• Skeletal muscle metabolism

When free T3 is low or suboptimal, patients may experience symptoms consistent with reduced thyroid hormone activity even when TSH and T4 appear to be within acceptable ranges.

This is the clinical gap many patients fall into. They may have enough T4 to keep TSH within range, but they may not be converting T4 to T3 efficiently or may have impaired T3 signaling at the receptor level.

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Why a Normal TSH May Not Explain Persistent Low-Thyroid Symptoms

A patient can have a normal TSH and still experience symptoms that resemble hypothyroidism if the issue is not thyroid gland production but rather thyroid hormone conversion, transport, or cellular response.

For example:

• The thyroid may produce enough T4
• TSH may remain within the laboratory reference range
• But conversion of T4 to free T3 may be reduced
• The patient may experience fatigue, cold intolerance, constipation, depression, hair thinning, and slowed metabolism.

This pattern is sometimes discussed in the medical literature under terms such as low T3 syndrome, non-thyroidal illness syndrome, or altered thyroid hormone metabolism during illness, stress, caloric restriction, inflammation, and systemic disease (Fliers et al., 2015; Warner & Mittag, 2012).

In conventional endocrinology, these patterns are often interpreted cautiously because not every low-T3 pattern requires thyroid medication. I agree with that caution. In my practice, the goal is not to medicate every lab variation. The goal is to understand why the body is downregulating active thyroid hormone and whether that change reflects stress, inflammation, undernutrition, illness, medication effects, or metabolic dysfunction.

That is where integrative functional medicine becomes valuable. We ask a broader question: What is the body adapting to?

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Common Symptoms of Low Free T3 and Reduced Thyroid Hormone Activity

When thyroid hormone action is reduced, symptoms can be broad because thyroid hormones affect nearly every tissue. Many patients describe a gradual slowing of their system.

Common symptoms may include:

• Cold hands and cold feet
• Low body temperature
• Dry skin
• Dry or thinning hair
• Thinning eyebrows
• Brittle nails
• Constipation
• Bloating
• Irritable bowel symptoms
• Fatigue
• Brain fog
• Low motivation
• Depressive symptoms
• Anxiety
• Difficulty losing weight
• Weight regain after dieting
• Muscle stiffness
• Joint discomfort
• Menstrual changes
• Reduced exercise tolerance

These symptoms are not specific to thyroid dysfunction alone. They can overlap with anemia, insulin resistance, menopause, low testosterone, nutrient deficiencies, chronic pain, autoimmune disease, depression, sleep apnea, medication side effects, and chronic stress. This is why a comprehensive clinical evaluation is essential.

As I often explain to patients, symptoms are clues. They are not diagnoses in themselves, but they tell us where to investigate.

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THYROID DYSFUNCTION ***MUST WATCH*** (Assessment and treatment)- Video

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Laboratory Reference Ranges Versus Optimal Clinical Interpretation

One of the most important concepts in functional medicine is understanding the difference between a laboratory reference range and an optimal physiological range.

A laboratory reference range is usually based on statistical patterns in a tested population. It tells us where most tested people fall. It does not necessarily tell us where an individual patient functions best.

For example, if a patient’s free T3 is at the low end of the reference range, the report may not flag it as abnormal. However, if that patient has fatigue, cold intolerance, constipation, hair loss, and metabolic slowdown, I do not ignore the pattern simply because the lab software says it is “normal.”

In clinical practice, I consider:

• The patient’s symptoms
• The full thyroid panel
• Medication history
• Dieting history
• Stress burden
• Inflammation markers
• Metabolic markers
• Autoimmune risk
• Gut health
• Nutrient status
• Personal and family history
• Physical exam findings

The goal is not to chase numbers. The goal is to understand physiology and restore function safely.

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How Stress Reduces T4-to-T3 Conversion

Stress is one of the most powerful regulators of thyroid physiology. When the body is under chronic stress, it prioritizes survival over optimal metabolism.

The stress response involves the hypothalamic-pituitary-adrenal (HPA) axis. During prolonged stress, cortisol patterns may become dysregulated, inflammation may rise, sleep may worsen, and thyroid hormone conversion may shift.

Chronic stress can influence thyroid function by:

• Reducing conversion of T4 to T3
• Increasing production of reverse T3, an inactive thyroid hormone metabolite
• Altering pituitary signaling
• Increasing inflammatory cytokines
• Disrupting gut barrier function
• Increasing insulin resistance
• Reducing mitochondrial efficiency

From a physiological standpoint, this makes sense. If the brain perceives stress, threat, starvation, pain, or illness, it may reduce the availability of active thyroid hormone to conserve energy. This can feel terrible to the patient, but biologically it may represent an adaptive response.

This is why stress management is not a luxury. It is a thyroid-supportive strategy.

Useful interventions may include:

• Breathing retraining
• Box breathing
• Meditation
• Sleep optimization
• Gentle exercise
• Time-restricted digital exposure
• Pain reduction
• Rehabilitation
• Nutrient repletion
• Counseling when appropriate
• Autonomic nervous system regulation

In my clinical observations, patients with chronic pain, whiplash injuries, spinal dysfunction, poor sleep, and high sympathetic tone often present with metabolic symptoms that overlap with thyroid dysfunction. Addressing the nervous system and musculoskeletal system can be a meaningful part of the broader care plan.

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Caloric Restriction, GLP-1 Medications, and Low T3 Patterns

Another important clinical issue is rapid weight loss or prolonged caloric restriction. Many patients now use GLP-1 receptor agonist medications, such as semaglutide or tirzepatide, under medical supervision for obesity, diabetes, and insulin resistance. These medications can be highly effective for appetite regulation and metabolic improvement, but any rapid reduction in food intake can influence thyroid hormone metabolism.

When the body senses low energy availability, it may reduce the conversion of T4 to T3. This lowers active thyroid hormone signaling and slows metabolic rate. From an evolutionary perspective, this helps conserve energy during famine. In modern clinical practice, it may appear as:

• Cold intolerance
• Hair shedding
• Fatigue
• Reduced resting metabolic rate
• Constipation
• Weight-loss plateau
• Difficulty maintaining weight loss after stopping medication

This does not mean GLP-1 medications are “bad.” It means patients using them should be monitored carefully. Adequate protein intake, resistance training, micronutrient sufficiency, hydration, bowel regularity, and medical oversight are essential.

In our integrative model, we pay attention to:

• Lean muscle preservation
• Protein intake
• Electrolytes
• Micronutrients
• Thyroid markers
• Blood glucose
• Insulin resistance
• Liver function
• Gut motility
• Functional capacity
• Strength and balance

Weight loss is not just about pounds lost. It is about improving metabolic resilience while protecting muscle, thyroid function, and long-term health.

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Inflammation, Autoimmunity, and Thyroid Function

Inflammation can interfere with thyroid physiology at multiple levels. Pro-inflammatory cytokines can alter hypothalamic and pituitary signaling, reduce peripheral conversion of T4 to T3, affect receptor sensitivity, and contribute to fatigue and mood symptoms.

Autoimmune thyroid disease is also common. Hashimoto’s thyroiditis is one of the leading causes of hypothyroidism in iodine-sufficient regions. It involves immune-mediated thyroid tissue injury and may be associated with antibodies such as:

• Thyroid peroxidase antibodies
• Thyroglobulin antibodies

When clinically appropriate, antibody testing may help identify autoimmune patterns. If autoimmune thyroid disease is present, treatment planning may include medical management, anti-inflammatory nutrition, gut health support, vitamin D optimization, selenium sufficiency, stress reduction, and monitoring for associated autoimmune conditions.

Research has shown that thyroid autoimmunity and thyroid dysfunction can be associated with systemic immune activity, and management should be individualized rather than reduced to a single lab value (Chaker et al., 2017).

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Why Gut Health Matters for Thyroid Hormone Metabolism

The gut and thyroid communicate through immune, metabolic, and endocrine pathways. Gut dysfunction may contribute to inflammation, nutrient malabsorption, constipation, altered detoxification, and immune activation.

The gut affects thyroid function through:

• Nutrient absorption
• Microbiome metabolism
• Immune regulation
• Bile flow and hormone clearance
• Intestinal barrier integrity
• Inflammatory signaling

Key nutrients for thyroid physiology include:

• Iodine
• Selenium
• Zinc
• Iron
• Magnesium
• Vitamin D
• Vitamin A
• B vitamins
• Protein and amino acids

Selenium, for example, is required for deiodinase enzymes that help convert T4 to T3. Iron is needed for thyroid peroxidase function. Zinc participates in thyroid hormone metabolism and immune regulation.

This is why I often assess digestive symptoms when patients present with thyroid-like complaints. Constipation may be a symptom of low thyroid activity, but gut dysfunction can also worsen thyroid-related physiology. It is a bidirectional relationship.

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Integrative Chiropractic Care and Thyroid-Related Symptoms

Chiropractic care does not replace thyroid medication, endocrinology evaluation, or internal medicine oversight. However, integrative chiropractic care can support patients with thyroid-related symptoms by addressing musculoskeletal, neurological, rehabilitative, and lifestyle factors that influence whole-body function.

In my role as a chiropractor and nurse practitioner, I look at how the spine, nervous system, muscles, fascia, movement patterns, and pain pathways interact with metabolic health.

Chronic pain and spinal dysfunction may contribute to:

• Sympathetic nervous system overactivity
• Poor sleep
• Reduced physical activity
• Inflammation
• Stress hormone dysregulation
• Muscle deconditioning
• Weight gain
• Fatigue
• Mood changes

When a patient is in pain, the body often remains in a protective state. This can increase stress load and reduce the patient’s capacity to exercise, sleep deeply, and maintain healthy metabolic rhythms.

Integrative chiropractic care may include:

• Spinal assessment and targeted adjustments
• Soft tissue therapy
• Corrective exercise
• Postural rehabilitation
• Functional movement evaluation
• Neuromuscular re-education
• Injury rehabilitation
• Ergonomic coaching
• Anti-inflammatory lifestyle planning
• Coordination with medical providers

The purpose is to reduce pain, improve mobility, restore function, and help the nervous system move away from chronic threat signaling. When patients move better and hurt less, they often sleep better, breathe better, train better, and regulate stress more effectively. These improvements can indirectly support metabolic and endocrine resilience.

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The Role of Dr. Maria Guadalupe Cardenas, MD, in Our Multidisciplinary Care Model

At Injury Medical Clinic PA, also known as Mission Plaza Injury Medical Clinic, in El Paso, Texas, our care model includes medical oversight and interdisciplinary coordination.

Dr. Maria Guadalupe Cardenas, MD, Board Certified in Internal Medicine, NPI #1164426749, Texas Medical License #J2933, has more than 40 years of experience as an internist. She serves as the Medical Director and Collaborative Physician for our practice.

This type of multidisciplinary structure is common in integrative, injury, rehabilitation, and functional medicine settings. It allows a clinic to combine the strengths of different professional disciplines while maintaining appropriate medical oversight.

In our setting:

• I provide chiropractic care, functional medicine assessment, rehabilitation planning, personal injury care, and advanced clinical evaluation within my professional scope.
• Dr. Cardenas provides internal medicine oversight, medical direction, and collaborative support.
• The team works together to identify when patients need medical testing, medication review, specialist referral, imaging, laboratory evaluation, or urgent medical attention.
• Patients benefit from an integrated care pathway that considers structure, function, inflammation, metabolism, pain, and recovery.

This approach is especially important for patients with complex symptoms. A patient may present after an auto accident with neck pain, headaches, poor sleep, fatigue, weight gain, anxiety, and digestive dysfunction. If we only look at the spine, we miss the metabolic picture. If we only look at labs, we miss the injury and nervous system picture. Integrative care allows us to connect the dots.

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Functional Medicine Evaluation for Thyroid-Related Concerns

When evaluating thyroid-related symptoms, I often consider a broader laboratory and clinical picture. Depending on the patient’s history and medical necessity, a clinician may consider:

• TSH
• Free T4
• Free T3
• Reverse T3
• Thyroid peroxidase antibodies
• Thyroglobulin antibodies
• Complete blood count
• Comprehensive metabolic panel
• Fasting insulin
• Hemoglobin A1c
• Lipid panel
• Vitamin D
• Ferritin and iron studies
• B12 and folate
• Inflammatory markers
• Sex hormones when appropriate
• Cortisol rhythm assessment when clinically indicated

The purpose is not to order excessive testing but to answer clinical questions. If a patient has thyroid-like symptoms, we need to know whether the problem is thyroid gland output, hormone conversion, inflammation, autoimmunity, anemia, insulin resistance, nutrient deficiency, menopause, chronic stress, pain, medication effects, or sleep disruption.

Functional medicine works best when it is disciplined, evidence-informed, and clinically practical.

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Treatment Reasoning: Why Each Strategy May Be Used

Nutrition and Protein Intake

Adequate nutrition supports thyroid hormone production, conversion, detoxification, immune balance, and mitochondrial function. Protein provides amino acids needed for tissue repair, enzyme function, neurotransmitter production, and muscle maintenance.

When patients diet aggressively, active thyroid signaling may decline. Therefore, I emphasize sustainable nutrition rather than extreme restriction.

Resistance Training and Rehabilitation

Muscle is a metabolic organ. It improves glucose disposal, supports insulin sensitivity, protects joints, and helps maintain resting metabolic rate. For patients recovering from injury or fatigue, rehabilitation must be progressive and individualized.

Stress Regulation

Stress can alter thyroid conversion, sleep, cortisol rhythms, blood sugar, gut function, and inflammation. Breathing strategies, meditation, chiropractic care, sleep routines, and pain reduction all help regulate the nervous system.

Gut Health Support

Because the gut influences immune tone, nutrient absorption, inflammation, and bowel motility, it must be considered in patients with thyroid symptoms. Constipation, bloating, reflux, and IBS-like symptoms can provide important clues.

Medical Oversight and Medication Review

Some patients require thyroid medication. Others do not. Some patients need evaluation for autoimmune thyroid disease, nodules, hyperthyroidism, or medication interactions. This is where medical collaboration with Dr. Cardenas and appropriate referrals become essential.

Chiropractic and Neuromusculoskeletal Care

Pain and restricted movement can perpetuate sympathetic dominance and reduce physical activity. Chiropractic and rehabilitation interventions help improve function, reduce pain burden, and support whole-person recovery.

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Medication Myths: Does Starting Thyroid Medication Always Mean Taking It Forever?

One common fear is that starting thyroid medication automatically means lifelong dependence. The answer depends on why the medication is being used.

If a patient has permanent primary hypothyroidism, thyroid removal, thyroid destruction, or significant autoimmune gland failure, long-term medication may be necessary.

However, if thyroid hormone changes are related to transient stress, caloric restriction, illness, medication effects, or reversible metabolic dysfunction, the situation may be different. Medication decisions should always be individualized, supervised, and based on appropriate diagnosis and monitoring.

It is also important to understand that thyroid physiology operates through feedback loops. The pituitary senses circulating hormone levels and adjusts TSH signaling accordingly. This system is dynamic. Patients should never start, stop, or change thyroid medication without medical guidance.

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Clinical Observations From My Practice in El Paso

In my clinical work, including the integrative care I provide through my professional platforms at ChiroMed and my clinical profile, I frequently observe that complex patients rarely have a single isolated problem. Many have overlapping patterns involving:

• Auto injury trauma
• Neck and back pain
• Headaches
• Poor sleep
• Stress overload
• Inflammatory nutrition patterns
• Insulin resistance
• Gut dysfunction
• Hormonal transitions
• Fatigue
• Reduced exercise capacity

When these factors accumulate, the body may downshift energy production. Patients may interpret this as “my thyroid is broken,” but the deeper truth may be that the body is adapting to pain, stress, inflammation, under-recovery, or metabolic dysfunction.

My job is to help patients understand the pattern, coordinate care, and build a plan that restores function step by step.

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A Patient-Centered Thyroid and Integrative Care Plan

A comprehensive care plan may include:

• Full history and symptom review
• Medication and supplement review
• Thyroid panel when appropriate
• Inflammation and metabolic screening
• Nutrient status evaluation
• Postural and spinal assessment
• Functional movement testing
• Pain and injury evaluation
• Nutrition planning
• Stress and sleep interventions
• Rehabilitation and strengthening
• Medical oversight
• Referral to endocrinology or other specialists when needed

This approach helps ensure that patients are not reduced to a lab value. They are evaluated as whole people with interconnected systems.

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Key Takeaways About Thyroid Labs, Symptoms, and Integrative Care

The most important points I want patients to remember are:

• TSH is useful, but it is not the entire thyroid story
• Free T4 and free T3 may provide additional clinical context
• T3 is the active thyroid hormone that drives many metabolic effects
• Stress, inflammation, aging, illness, and caloric restriction may reduce T4-to-T3 conversion
• Normal labs do not always mean optimal function
• Symptoms must be interpreted in context
• Chiropractic care can support thyroid-related recovery by reducing pain, improving movement, and calming nervous system stress.
• Medical oversight is essential when thyroid disease, medication, or systemic illness is involved.
• Multidisciplinary care allows us to evaluate the patient more completely

At Injury Medical Clinic PA in El Paso, our mission is to integrate the best of chiropractic, functional medicine, internal medicine oversight, rehabilitation, and personal injury care to help patients recover function, understand their physiology, and move toward better health.

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References

• Chaker, L., Bianco, A. C., Jonklaas, J., & Peeters, R. P. (2017). Hypothyroidism. The Lancet, 390(10101), 1550-1562.
• Fliers, E., Bianco, A. C., Langouche, L., & Boelen, A. (2015). Thyroid function in critically ill patients. The Lancet Diabetes & Endocrinology, 3(10), 816-825.
• Jonklaas, J., Bianco, A. C., Bauer, A. J., Burman, K. D., Cappola, A. R., Celi, F. S., Cooper, D. S., Kim, B. W., Peeters, R. P., Rosenthal, M. S., & Sawka, A. M. (2014). Guidelines for the treatment of hypothyroidism: Prepared by the American Thyroid Association Task Force on Thyroid Hormone Replacement. Thyroid, 24(12), 1670-1751.
• McAninch, E. A., & Bianco, A. C. (2016). The history and future of treatment of hypothyroidism. Annals of Internal Medicine, 164(1), 50-56.
• Mullur, R., Liu, Y. Y., & Brent, G. A. (2014). Thyroid hormone regulation of metabolism. Physiological Reviews, 94(2), 355-382.
• Warner, A., & Mittag, J. (2012). Thyroid hormone and the central control of homeostasis. Journal of Endocrinology, 212(3), 307-317.
• Wiersinga, W. M. (2014). Paradigm shifts in thyroid hormone replacement therapies for hypothyroidism. Nature Reviews Endocrinology, 10(3), 164-174.

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