Hormone Optimization for Optimal Thyroid Health & Wellness

Discover effective methods for thyroid health with hormone optimization and support your body’s hormonal balance.

Abstract

In this educational post, I share how I evaluate thyroid function beyond the standard TSH test, focusing on the often overlooked role of low free T3. Drawing on modern, evidence-based research and two decades of clinical observations, I explain the physiology of T4-to-T3 conversion, why patients can be fully symptomatic despite “normal” labs, and how stress, aging, restrictive dieting, and medications impair the deiodinase enzymes that generate active T3. I also outline practical strategies—integrative chiropractic care, functional medicine tools, medical oversight, and targeted therapies—to address these gaps. I highlight our multidisciplinary approach at Injury Medical Clinic PA (Mission Plaza Injury Medical Clinic) in El Paso, Texas, where I, Dr. Alexander Jimenez, DC, APRN, FNP-BC, CFMP, IFMCP, ATN, CCST, collaborate with our Medical Director, Dr. Maria Guadalupe Cardenas, MD (Board Certified in Internal Medicine) (NPI #1164426749, Texas MD License #J2933). Together, we integrate internal medicine, chiropractic, rehabilitative care, functional medicine, and personal injury services to restore metabolic balance and whole-person health.

Understanding Thyroid Testing: Why Symptoms Persist Despite “Normal” Labs

As a clinician focused on hormone and metabolic health, I began scrutinizing patterns of “suboptimal thyroid” about 15–16 years ago. Even after optimizing sex hormones—especially in women over 45 or 50—some symptoms lingered: mild depression, anxiety, low energy, cold hands and feet, dry skin, hair thinning, constipation, and bloating. These overlap with low testosterone and low progesterone in women, yet they often persisted after hormone optimization. That is when deeper thyroid analysis became crucial.

What I learned from leading researchers and modern endocrine literature is simple yet powerful: relying solely on the thyroid-stimulating hormone (TSH) misses a critical part of the picture. Here’s why:

• TSH is a screening hormone that reflects the brain’s response to circulating T4 (thyroxine). It goes up when T4 is low and goes down when T4 is high. This inverse feedback loop screens for primary hypothyroidism and hyperthyroidism.
• The thyroid secretes mostly T4 (~80%) and less T3 (~20%). T3 is the biologically active hormone at the cellular receptor. It drives metabolic rate, mitochondrial function, temperature regulation, and neuropsychiatric balance.
• Critically, T3 does not directly influence TSH. You can have a normal T4 and normal TSH, yet a low free T3 and be fully symptomatic. If no one orders free T3, you may be told your thyroid is “normal” while you continue to struggle.

In our practice, we routinely order a TSH, free T4, and free T3. “Free” indicates the unbound fraction available for tissues. This simple addition to standard labs often explains lingering symptoms and guides a more precise plan.

References: Jonklass et al., 2014; Bianco et al., 2019

The Physiology Of T4-To-T3 Conversion: Deiodinase Enzymes And Clinical Implications

T4 is best thought of as a prohormone. The body converts T4 into the active form, T3, using deiodinase enzymes (primarily DIO1 and DIO2). These selenoproteins remove an iodine atom to generate T3, enabling cellular metabolic action.

• DIO1: Found in liver, kidney, and thyroid; contributes significantly to circulating T3.
• DIO2: Present in brain, brown adipose tissue, skeletal muscle; generates local T3 for tissue-specific needs.
• DIO3: Inactivates T3 and T4, producing reverse T3 (rT3), especially in illness or stress states.

When DIO1/DIO2 activity drops, T3 availability declines, even if T4 and TSH look “fine.” Clinically, this shows up as: cold intolerance, dry skin, hair thinning, brittle nails, constipation/IBS, mood symptoms, heart palpitations, and impaired exercise recovery—patterns I frequently observe in complex spine and pain patients where metabolic resilience is vital for rehabilitation success.

Why do deiodinase enzymes falter?

• Chronic stress increases cortisol and inflammatory signaling, which suppress deiodinase activity, thereby lowering T3 production (Gereben et al., 2008).
• Restrictive calorie intake—including aggressive intermittent fasting or rapid weight loss on GLP-1 agonists (e.g., semaglutide, tirzepatide)—signals energy scarcity. The body conserves energy by reducing T3 to slow metabolism (Rosenbaum & Leibel, 2010).
• Aging reduces DIO activity and thyroid receptor responsiveness, which explains why older adults with “normal” TSH may present with low-T3 symptoms.
• Insulin resistance and chronic low-grade inflammation blunt conversion.
• Certain medications and even T4-only therapies can be associated with lower DIO1 activity in some individuals, leaving them symptomatic despite a “perfect” TSH.

References: Bianco & da Conceição, 2018; Gereben et al., 2008; Rosenbaum & Leibel, 2010

Why Reference Ranges Can Mislead: Aim For The Healthier End Of The Curve

Lab slips provide wide reference ranges derived from population averages that include many chronically ill individuals. A free T3 of 2.3–2.5 pg/mL may be “normal,” yet literature associates lower-normal free T3 with increased cardiovascular risk, inflammation, and all-cause mortality in specific cohorts. In practice, patients with persistent symptoms often feel better in the upper half of the free T3 range (commonly around 4.0–5.0 pg/mL), which aligns more closely with youthful physiology.

Similarly, vitamin D ranges (30–100 ng/mL) are broad; data show that risks increase below ~60 ng/mL, affecting metabolic and immune health—both critical for thyroid function.

Reasoning:

• Higher free T3 levels within the normal range support mitochondrial output, thermoregulation, neuromodulation, and GI motility.
• Optimizing vitamin D reduces inflammatory tone, improves insulin sensitivity, and supports thyroid autoimmunity balance.

References: Peeters, 2009; Holick et al., 2011

Integrative Chiropractic Care And Thyroid Health: Connecting Structure And Metabolism

In our clinic, we see the interplay between thyroid function and musculoskeletal health daily. As a chiropractor and functional medicine clinician, I view thyroid physiology as integral to tissue recovery, nerve health, and pain modulation:

• Metabolic support for healing: Adequate T3 enhances mitochondrial ATP production, which powers disc and ligament repair and muscle recovery—foundational in sciatica and spine rehabilitation. My observations in patients documented at sciatica.clinic show those with optimized metabolic markers—thyroid, vitamin D, iron—progress faster through rehab programs and tolerate graded loading better.
• Autonomic balance: Chronic hypothyroid patterns shift sympathetic tone, raising pain sensitivity. Restoring T3 helps normalize autonomic balance, improving heart rate variability and pain thresholds.
• GI motility and inflammation: T3 supports peristalsis and reduces intestinal stasis. When constipation and bloating improve, the systemic inflammatory load decreases, positively affecting joint pain and neuropathic symptoms.

From a chiropractic perspective, addressing biomechanics—through spinal adjustments, soft-tissue therapies, and corrective exercises—reduces the nociceptive drive. Combining this with metabolic optimization (thyroid, insulin, micronutrients) reduces central sensitization, allowing adjustments to “hold” better and rehabilitation gains to consolidate. This is the integrative rationale behind our protocols.

Clinical notes and observations: Sciatica Clinic; Dr. Alex Jimenez on LinkedIn

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

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Our Multidisciplinary Team: Internal Medicine Oversight With Functional And Injury Care

I am honored to work with Dr. Maria Guadalupe Cardenas, MD, Board Certified in Internal Medicine (NPI #1164426749, Texas MD License #J2933), who serves as the Medical Director and Collaborative Physician at Injury Medical Clinic PA (Mission Plaza Injury Medical Clinic) in El Paso, Texas. With over 40 years of experience as an internist, Dr. Cardenas provides medical direction typical of multidisciplinary injury and integrative clinics, ensuring diagnostic accuracy, safety, and quality of care.

How we integrate care:

• Medical oversight (Dr. Cardenas): Comprehensive medical evaluations, medication management, identification of endocrine or autoimmune contributors (Hashimoto’s, Graves’), and coordination of labs and imaging.
• Chiropractic and rehabilitation (Dr. Jimenez): Spinal and extremity adjustments, soft tissue work, neuromuscular re-education, corrective exercise, and graded exposure.
• Functional medicine: Deep lab panels (TSH, free T4, free T3, rT3 when indicated), nutrient assessment (iodine, selenium, iron status, vitamin D), gut health, sleep, stress physiology.
• Personal injury care: Integrated management of whiplash, spine pain, and neuropathic complaints where metabolic support accelerates repair.

Why this matters: A patient with post-injury pain and fatigue may have suboptimal T3 blunting recovery. When Dr. Cardenas confirms medical stability, and we optimize T3 conversion—with nutrition, stress reduction, and selective therapies—the patient’s tolerance for progressive rehab improves, reducing the likelihood of chronic pain.

Practical Testing And Targets: What We Order And Why

We customize testing but generally include:

• TSH, free T4, free T3: Identifies low T3 syndrome with normal TSH/T4, guiding conversion-focused strategies.
• Reverse T3 (rT3): Considered when stress/illness is high; elevated rT3 suggests a conservation state that competes with T3 at the receptor.
• Thyroid antibodies (TPOAb, TgAb): Screens for autoimmunity (Hashimoto’s), which requires tailored anti-inflammatory and immune-modulatory approaches.
• Micronutrients: Selenium (supports deiodinase), iodine (substrate for thyroid hormones, used judiciously), iron/ferritin (required for thyroid peroxidase), vitamin D, zinc, magnesium.
• Metabolic markers: Fasting glucose, insulin, HbA1c, lipid profile, hs-CRP—insulin resistance and inflammation directly hinder T3 conversion.

Targets and reasoning:

• Free T3: Aim for upper half of normal (commonly ~4.0–5.0 pg/mL) if symptomatic and medically appropriate—supports energy, mood, motility, and tissue repair.
• Vitamin D: Often 60–100 ng/mL is functionally optimal for immune-metabolic balance under medical supervision.
• Ferritin: Typically 70–100 ng/mL for thyroid enzyme efficiency, particularly in menstruating women.

References: Wartofsky & Dickey, 2005; Mensink et al., 2017

Why Patients On T4-Only Therapy May Still Feel Hypothyroid

Standard practice often prescribes levothyroxine (T4) to lower TSH. Many patients normalize TSH, yet remain symptomatic: cold intolerance, metabolic slowing, constipation, mood symptoms. Potential reasons include:

• Inadequate conversion due to low DIO1/DIO2 activity from stress, aging, calorie restriction, insulin resistance, or inflammation.
• Tissue-level hypothyroidism: Even with adequate serum T3, local tissue conversion and receptor sensitivity can be impaired.
• rT3 dominance: Elevated reverse T3 competes with T3 at the receptor, reducing effect.

When appropriate and under medical oversight, we consider combination therapy (T4/T3) or low-dose desiccated thyroid to raise free T3 toward the optimal range. This is individualized, closely monitored, and paired with lifestyle and nutritional strategies.

References: Escobar-Morreale et al., 2005; Hoermann et al., 2019

Lifestyle And Clinical Strategies To Improve T3 Conversion

I focus on fundamentals first. Here’s how and why:

• Stress regulation: Box breathing, paced respiration, meditation, and sleep hygiene lower cortisol and inflammatory signaling, restoring deiodinase function and T3 generation. Reasoning: Reduced HPA axis activation normalizes metabolic signaling and autonomic balance.
• Adequate protein and micronutrients: Sufficient amounts of amino acids, selenium, zinc, magnesium, iron, and iodine (when indicated) support thyroid hormone synthesis and conversion. Reasoning: Deiodinase enzymes are selenoproteins; iron supports thyroid peroxidase; zinc and magnesium aid receptor function.
• Balanced caloric intake: Avoid chronic severe calorie restriction. Reasoning: Prolonged energy deficit triggers conservation, lowering T3 to suppress metabolism.
• Anti-inflammatory nutrition: Emphasize omega-3s, polyphenol-rich plants, and gut-supportive fibers. Reasoning: Lower inflammation improves receptor sensitivity and conversion.
• Glycemic control: Address insulin resistance with movement, resistant starches, and time-aware eating. Reasoning: Insulin sensitization supports deiodinase activity and reduces rT3 generation.

When lifestyle correction isn’t enough, medically supervised options include:

• Low-dose T3-inclusive therapy: Combination T4/T3 or desiccated thyroid (e.g., Armor, NP, or newer porcine formulations). Reasoning: Directly raises free T3 into the functional range for symptomatic relief while monitoring TSH, free T4, and cardiac status.
• Addressing autoimmunity: In Hashimoto’s, reduce triggers (e.g., gluten in select cases, dysbiosis), and enhance vitamin D, selenium, and myo-inositol as appropriate. Reasoning: Lower antibody activity stabilizes thyroid output and conversion.

References: Gartlehner et al., 2021; Benvenga et al., 2017

Clarifying A Common Myth: Will Thyroid Medication Suppress My Own Thyroid Forever?

A frequent concern is “If I start thyroid medication, will I be on it for life?” The answer depends on the cause:

• Primary hypothyroidism (elevated TSH due to underproduction) typically requires lifelong therapy.
• Low T3 conversion related to stress, dieting, or age may be reversible. Low-dose T3-inclusive support can be used temporarily while we correct the root causes. If medication is discontinued, the pituitary-thyroid feedback loop resumes; TSH rises appropriately, signaling the thyroid to produce hormone again. This is not permanent suppression.

Clinical reasoning: We use medication when physiology needs a bridge, while simultaneously restoring the conditions for healthy conversion and receptor function.

References: Jonklaas et al., 2014

Integrative Protocol Flow: From Assessment To Rehabilitation

Our stepwise approach blends medical, chiropractic, and functional medicine:

1. Comprehensive intake: Symptoms, injury history, sleep, diet, stress, and medication review.
2. Medical labs and imaging (Dr. Cardenas): TSH, free T4, free T3, rT3 if indicated, TPO/Tg antibodies, ferritin/iron, vitamin D, insulin resistance markers; spine imaging when appropriate.
3. Chiropractic evaluation (Dr. Jimenez): Posture, gait, joint motion, myofascial trigger points, nerve tension tests; sciatica and spine-specific assessments.
4. Initial corrective plan:

• • Chiropractic adjustments and soft tissue release to reduce nociceptive load.
  • Anti-inflammatory nutrition, protein optimization, micronutrient repletion.
  • Stress modulation and sleep scheduling.

• Targeted thyroid support:

• • If low T3 persists, consider low-dose T3-inclusive therapy under medical oversight.
  • Recheck labs, monitor heart rate, blood pressure, and symptoms.

• Rehabilitation progression:

• • Graded loading, core stabilization, neuromuscular re-education.
  • Track functional metrics: pain scale, range of motion, HRV, energy levels.

• Reassessment and tapering:

• • If conversion improves, taper the medication as appropriate and maintain lifestyle support.
  • Long-term maintenance with periodic labs and structured exercise.

Clinical observations: Patients with sciatica and chronic low back pain who improve free T3 and vitamin D often experience faster progress and fewer setbacks in phased rehabilitation programs. See cases and insights at sciatica.clinic and my professional updates on LinkedIn.

Conclusion: Precision Thyroid Care Within An Integrative Framework

Thyroid health is more than TSH. When free T3 is overlooked, patients endure preventable symptoms that slow recovery, sap energy, and complicate pain management. By integrating internal medicine oversight from Dr. Maria Guadalupe Cardenas, MD, with chiropractic care, functional medicine, and rehabilitation, our team identifies and corrects conversion barriers, optimizes physiology, and accelerates healing.

If you have persistent symptoms with “normal” labs, ask for a TSH, free T4, and free T3. Address stress, nutrition, and metabolic health. And when needed, consider carefully supervised T3-inclusive therapy. In our clinic, this integrative, multidisciplinary approach helps patients reclaim function, resilience, and quality of life.

References

• Bianco, A. C., & da Conceição, R. R. (2018). The deiodinase trio and thyroid hormone signaling. Annual Review of Physiology, 80, 347–367.
• Bianco, A. C., et al. (2019). Paradigms of thyroid hormone action: Understanding the roles of T3 and T4. Nature Reviews Endocrinology, 15(6), 323–334.
• Escobar-Morreale, H. F., et al. (2005). Thyroid hormone replacement therapy in hypothyroidism: A randomized trial of added liothyronine. The Journal of Clinical Endocrinology & Metabolism, 90(8), 4946–4954.
• Gereben, B., et al. (2008). Deiodinases and the control of thyroid hormone signaling. Nature Reviews Endocrinology, 4(4), 240–248.
• Holick, M. F., et al. (2011). Evaluation, treatment, and prevention of vitamin D deficiency: An Endocrine Society clinical practice guideline. Current Opinion in Endocrinology, Diabetes and Obesity, 18(6), 335–339.
• Hoermann, R., et al. (2019). Homeostasis of thyroid hormones in body compartments: TSH-free T4 relationship. Frontiers in Endocrinology, 10, 59.
• Jonklaas, J., et al. (2014). Guidelines for the treatment of hypothyroidism. The Journal of Clinical Endocrinology & Metabolism, 99(7), 2543–2565.
• Mensink, R. P., et al. (2017). Micronutrients and thyroid function: A review. The American Journal of Clinical Nutrition, 105(6), 1489–1496.
• Peeters, R. P. (2009). Thyroid hormones and aging. Journal of the Endocrine Society, 1(2), 65–77.
• Rosenbaum, M., & Leibel, R. L. (2010). Adaptive thermogenesis in humans. International Journal of Obesity, 34(S1), S47–S55.
• Wartofsky, L., & Dickey, R. A. (2005). The evidence for a narrower thyrotropin reference range is compelling. The Journal of Clinical Endocrinology & Metabolism, 90(9), 4955–4963.

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