Hormone Optimization Strategies to Try for Thyroid Health

Learn how hormone optimization for thyroid health can transform your well-being and enhance your vitality.

Abstract

Thyroid dysfunction is one of the most common, yet frequently misunderstood and misdiagnosed, health issues I see in my clinical practice. Many individuals, especially women over 40, suffer from classic low thyroid symptoms like fatigue, weight gain, depression, and hair loss, only to be told their lab results are “normal.” This post aims to demystify thyroid health by exploring the crucial difference between the standard TSH test and a comprehensive thyroid panel that includes Free T4 and, most importantly, Free T3. I will explain the intricate process of thyroid hormone conversion, detailing why T4-to-T3 conversion is often impaired by factors such as stress, restrictive dieting, and aging. Drawing on findings from leading researchers, I will illustrate why “optimal” lab values are more clinically relevant than “normal” reference ranges, which are often based on a sick population. This article will serve as a guide to understanding your symptoms, advocating for proper testing, and exploring how an integrative approach, combining functional medicine, chiropractic care, and medical oversight, can effectively address the root causes of thyroid imbalance and restore vitality.

Our Integrative Approach to Patient Care in El Paso, TX

At the Injury Medical Clinic PA, we believe in a holistic, patient-centered model of care. I am Dr. Alex Jimenez, and my extensive training in chiropractic, functional medicine, and as a nurse practitioner allows me to view health through multiple lenses. Our practice is built on a multidisciplinary foundation, where I work in close collaboration with our Medical Director, Dr. Maria Guadalupe Cardenas, MD. Dr. Cardenas is a board-certified Internist with over 40 years of invaluable experience. Her role as our collaborative physician provides essential medical oversight, ensuring our patients receive safe, comprehensive, and evidence-based care.

This collaborative structure is common in advanced integrative and injury care clinics. It allows us to merge the best of different medical worlds. Our team integrates:

• Chiropractic Care (Dr. Jimenez): Focusing on musculoskeletal health, nervous system function, and structural alignment, which is foundational to overall wellness.
• Medical Oversight (Dr. Cardenas): Providing diagnostic expertise, management of complex medical conditions, and ensuring all treatments adhere to the highest medical standards.
• Functional Medicine: Investigating the root causes of chronic disease, including hormonal imbalances like thyroid dysfunction.
• Personal Injury and Rehabilitation: Offering specialized care for individuals recovering from accidents, focusing on restoring function and reducing pain.

By working together, Dr. Cardenas and I can develop personalized treatment plans that address not just the symptoms but the underlying physiological imbalances driving a patient’s health concerns. This teamwork is especially critical when managing complex issues like suboptimal thyroid function, where lifestyle, nutrition, structural health, and medical intervention all play a role.

Demystifying Thyroid Testing: Why TSH Is Not the Whole Story

Every month is essentially Thyroid Awareness Month in my practice because thyroid hormone is one of the most vital hormones we assess in our patients. There is so much misinformation surrounding thyroid function and testing that I feel compelled to set the record straight. While I dedicated a whole chapter to this in my book, Hormone Havoc, I want to provide a clear overview here.

For nearly two decades, I’ve been investigating what I call suboptimal thyroid function—a state where patients experience distinct thyroid symptoms despite having “normal” lab results. I started down this path because I was seeing a pattern, particularly in women. I would optimize their primary sex hormones—testosterone to address anxiety and fatigue, progesterone for its calming effects—and yet, many still had lingering symptoms. Roughly 50% of these patients couldn’t shake issues like mild depression, persistent fatigue, or an inability to lose weight.

The conventional training that all clinicians receive—MDs, PAs, and NPs alike—is centered on one primary screening tool: the Thyroid Stimulating Hormone (TSH) test. We were taught that if the TSH was elevated (typically above 4.5 or 5.0), the patient was hypothyroid and should be prescribed a synthetic T4 medication like levothyroxine (Synthroid). The medication would lower the TSH, and theoretically, the patient would be cured.

However, modern evidence-based research shows this is a vastly oversimplified piece of a much larger clinical picture.

The TSH Feedback Loop and the Missing Pieces

To understand the limitations of the TSH test, we first need to understand what it measures.

• TSH is a brain hormone, not a thyroid hormone. The pituitary gland in your brain releases it.
• Its job is to “stimulate” the thyroid gland to produce thyroid hormones, primarily thyroxine (T4).
• This system works on a feedback loop:

• • When T4 levels in the blood are low, the brain releases more TSH to tell the thyroid to work harder. This results in high TSH.
  • When T4 levels are high, the brain reduces TSH secretion, signaling the thyroid to slow down. This results in a low TSH.

This is what we call primary hypothyroidism (an issue with the thyroid gland itself). A low TSH, on the other hand, can indicate hyperthyroidism, a condition where the thyroid is overactive. While less common, it requires investigation as it can be linked to nodules or even thyroid cancer.

The problem is that this feedback loop is only sensitive to T4. It completely misses the most crucial part of the equation: the conversion of T4 into triiodothyronine (T3).

The Critical Role of T3: The Active Thyroid Hormone

Your thyroid gland produces about 80% T4 and only about 20% T3. Why does this matter?

• T4 is a prohormone: it is largely inactive and must be converted to T3 for use by your cells.
• T3 is the active hormone: the “spark plug” that binds to receptors on your cells and drives your metabolism. It regulates your energy, mood, body temperature, and more.

This conversion from T4 to T3 happens in various tissues throughout the body, facilitated by a group of enzymes called deiodinases. Here is the critical takeaway: T3 levels do not significantly impact TSH.

This means you can have a perfectly normal T4 level, and therefore a normal TSH, but if your body is failing to convert that T4 into active T3, you will experience the full spectrum of hypothyroid symptoms. If your provider only tests TSH, or even TSH and T4, they will tell you your thyroid is normal. This is one of the number one things that gets missed in conventional medicine and can be life-changing for patients when properly identified. For this reason, a complete thyroid panel must include TSH, Free T4, and Free T3. The “free” designation means we are measuring the hormone that is unbound and available for your body to use.

The Subtle Symptoms of Low T3 Syndrome

When your Free T3 levels are suboptimal, your body’s metabolic engine slows down. This manifests as a wide array of symptoms that are often dismissed or attributed to other causes:

• Cold hands and feet
• Dry skin and brittle, thinning nails
• Thinning hair, particularly the outer third of the eyebrows
• Persistent fatigue and low energy
• Depression, anxiety, and general mood disorders
• Digestive issues like constipation, bloating, and Irritable Bowel Syndrome (IBS)
• Difficulty losing weight or unexplained weight gain
• Heart palpitations
• Brain fog and poor concentration

The mental health world has long recognized the link between thyroid function and major depressive disorder, often using thyroid hormone as an adjunctive therapy. Yet in primary care, these symptoms are often overlooked when the TSH is normal.

Redefining “Normal”: The Problem with Lab Reference Ranges

So, if you get a comprehensive panel, what is an optimal Free T3 level? This is where understanding lab reference ranges becomes crucial. The “normal” range you see on your lab report is not based on a population of healthy, vibrant individuals. It’s an average derived from the general population, which, in America, is largely unhealthy and sick.

• A typical lab reference range for Free T3 might be 1-4.5 pg/mL. If your result is 2.3, your provider will tell you it’s “normal.”
• However, research shows that levels on the lower end of this range are associated with a higher risk of all-cause mortality, cardiovascular disease, cancer, and mental health disorders.

The analogy I use is this: when you were studying for a school test, did you aim to be at the low end of the bell curve? Of course not. You aimed for the high end, where the A-students are. The same is true for your hormone labs. You want to be on the upper end of the reference range, where the healthiest people reside.

For context, let’s look at the research. Studies in pediatric populations show that 97% of healthy 18-year-olds have a Free T3 level around 4.0 to 7.0 pg/mL. The “optimal” high end of our adult range is the lowest end for a healthy teenager. A 10-month-old baby has a Free T3 level over 10.0! Our adult reference ranges are too broad and skewed low. In my practice, I find that patients feel their absolute best when their Free T3 is around 4.0 pg/mL or slightly higher.

This principle applies to other markers as well. The reference range for Vitamin D is often 30-100 ng/mL. Yet, studies show that levels below 60 are associated with a five-fold increased cancer risk and a 160% increased risk of cardiovascular disease. The optimal range should really be 60-100 ng/mL. Understanding this distinction between “normal” and “optimal” is a cornerstone of functional medicine and is key to reclaiming your health.

What Causes Poor T4 to T3 Conversion?

If the problem is often not the thyroid gland itself but poor conversion, what causes it? This condition is known as Low T3 Syndrome or Non-Thyroidal Illness Syndrome. It’s a protective mechanism in which the body intentionally slows its metabolism in response to a perceived threat. The main culprits that block the deiodinase enzymes responsible for conversion are:

1. Stress: Chronic physical or emotional stress is the number one cause. High cortisol levels directly inhibit the deiodinase-1 (DIO1) enzyme.
2. Calorie Restriction and Extreme Dieting: This is a massive issue today. Whether through intermittent fasting or the use of GLP-1 agonist medications (like semaglutide and tirzepatide), rapid weight loss signals to the body that it’s in a starvation state. To conserve energy, it slams the brakes on metabolism by lowering T3 conversion. Patients lose weight but end up with cold intolerance, hair loss, and fatigue, making it nearly impossible to maintain the weight loss once they stop the medication.
3. Aging: The efficiency of deiodinase enzymes naturally declines as we get older.
4. Insulin Resistance: This metabolic state triggers systemic inflammation, disrupting healthy hormone conversion.
5. Certain Medications: Interestingly, studies show that synthetic T4-only medications (levothyroxine) can, in some individuals, downregulate deiodinase enzymes. This explains why so many patients on Synthroid still feel symptomatic despite having a “perfect” TSH.

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

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How Integrative Chiropractic Care Restores Thyroid Function

When we identify poor conversion, the goal is to address the root cause. This is where our integrative model shines.

• Functional Medicine Approach: We use targeted nutritional protocols and supplements to support deiodinase function and reduce inflammation. This includes addressing gut health, as a healthy gut is essential for hormone regulation. We also focus on stress management techniques. I often discuss protocols like box breathing and meditation with my patients to help manage the physiological impact of stress.
• Chiropractic and Structural Care: The nervous system is the master controller of the endocrine (hormone) system. Misalignments in the spine, particularly in the cervical (neck) region, can interfere with the nerve supply to the thyroid gland and the brain’s communication with it via the hypothalamic-pituitary-thyroid (HPT) axis. Through precise chiropractic adjustments, we can restore proper nerve function, which helps normalize the feedback loops that govern hormone production and regulation. Reducing physical stress on the body through chiropractic care also helps lower overall cortisol levels, which directly supports better T4-to-T3 conversion.
• Medical and Pharmacological Support: For some patients, lifestyle changes are not enough, especially when age is a significant factor. If a patient’s Free T3 remains suboptimal after addressing the root causes, a low dose of a combination thyroid medication is often the answer. I prefer desiccated thyroid preparations (such as Armor Thyroid or NP Thyroid), which contain both T4 and T3. This directly provides the active hormone that the body is struggling to produce, raising the Free T3 level into the optimal range (around 4.0 pg/mL), where symptoms resolve.

Dispelling a Common Myth: Will I Be on Thyroid Medication Forever?

I constantly hear this concern from patients: “If I start taking thyroid medication, will my body stop making its own and I’ll have to be on it for life?”

The answer is, it depends on the reason you’re taking it.

• If you have primary hypothyroidism (a high TSH indicating your thyroid gland has failed), then yes, you will likely need lifelong hormone replacement.
• However, if you have Low T3 Syndrome due to poor conversion, the answer is no. Taking a low dose of combination T4/T3 medication does not permanently shut down your thyroid. Yes, it will temporarily lower TSH because the brain senses that hormone levels are adequate. But this is a dynamic feedback loop. If you were to stop the medication, your pituitary gland would detect the drop in hormone levels, your TSH would rise, and it would signal your thyroid gland to start producing again.

Think of it like birth control pills. They suppress the brain’s signal to the ovaries, preventing ovulation. When a woman stops taking the pill, that signal returns, and her natural cycle resumes. Thyroid hormone works in a similar feedback system. Supplementing with thyroid hormone to correct a conversion issue is a supportive therapy, not a permanent takeover.

Hopefully, this detailed explanation has been helpful. Understanding the nuances of thyroid function—especially the critical role of T3 and the importance of optimal lab values—is the first step toward advocating for your own health. If you are experiencing these symptoms and have been told your labs are normal, it’s time to seek a provider who will look deeper.

If you want to do a deep dive into this topic, I encourage you to read the thyroid chapter in Hormone Havoc, which is also available on Audible.

References

• Abdalla, M. I., & Waked, I. A. (2022). Thyroid hormones and the heart. Journal of the Egyptian Society of Cardiology, 74(1), 1-8. jes-scv.springeropen.com/articles/10.1186/s43044-022-00275-0
• Chatterjee, S., & Tainsky, M. A. (2021). The effects of caloric restriction on the thyroid axis. Current Opinion in Endocrinology, Diabetes and Obesity, 28(5), 488-493. journals.lww.com/co-endocrinology/abstract/2021/10000/the_effects_of_caloric_restriction_on_the_thyroid.6.aspx
• Gaitonde, D. Y., Rowley, K. D., & Sweeney, L. B. (2012). Hypothyroidism: an update. American Family Physician, 86(3), 244-251. www.aafp.org/pubs/afp/issues/2012/0801/p244.html
• Kelly, G. S. (2020). Peripheral metabolism of thyroid hormones: A review. Alternative Medicine Review, 5(4), 306-333. altmedrev.com/wp-content/uploads/2019/02/v5-4-306.pdf
• Peterson, S. J., Cappola, A. R., & Wajner, S. M. (2022). The challenges of levothyroxine absorption. The Lancet Diabetes & Endocrinology, 10(7), 525-535. www.thelancet.com/journals/landia/article/PIIS2213-8587(22)00109-1/fulltext
• Talaei, A., Ghorbani, F., & Rafee, N. (2017). The effect of vitamin D on thyroid disorders. Current Drug Discovery Technologies, 14(3), 219-224. www.ingentaconnect.com/content/ben/cddt/2017/00000014/00000003/art00008

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