The thyroid governs your metabolism, energy, body temperature, mood, hair, skin, and cognitive function. When it's underperforming — even subtly — the effects are felt in every cell of your body. We go far beyond TSH to find out why.
Book a Discovery CallCommon symptoms we address
"My TSH is normal, but I'm exhausted, gaining weight, and losing my hair."
Understanding thyroid function
The thyroid gland produces hormones that regulate the metabolic rate of virtually every cell in the body. Thyroid hormones control how quickly you burn energy, how your heart beats, how your gut moves, how your brain processes, and how your skin and hair grow.
But the thyroid doesn't operate in isolation. It's part of a cascade beginning in the brain and involving the liver, gut, adrenal glands, and peripheral tissues. A problem can occur anywhere along this chain — and TSH alone only measures one point in it.
Functional thyroid medicine investigates the entire cascade: whether you're making enough T4, converting it adequately to active T3, whether Reverse T3 is blocking receptor sites, whether your immune system is attacking the gland itself, and whether nutritional cofactors are supporting optimal function.
The thyroid hormone cascade
Hypothalamus → TRH
Thyrotropin-releasing hormone signals the pituitary to produce TSH based on perceived metabolic need.
TSH
Thyroid-stimulating hormone instructs the thyroid gland to produce T4. This is the only marker most conventional panels measure.
T4 (Thyroxine)
Mostly inactive storage form — must be converted to active T3 by the liver and peripheral tissues to have metabolic effect.
T4 → Free T3 or Reverse T3
Conversion quality — not just quantity — determines how much active hormone is available. Stress, gut dysfunction, and inflammation shift conversion toward inactive Reverse T3.
Free T3 at receptor sites
Active T3 binds to nuclear receptors in every cell — driving metabolism, energy, cognition, and tissue repair. Receptor resistance can persist even with adequate T3 levels.
The testing gap
TSH is a pituitary hormone, not a thyroid hormone. It tells us what the brain is signaling — not what the thyroid is producing, how well T4 is converting to active T3, whether antibodies are attacking the gland, or whether cells are actually responding to the hormone present.
Many patients with clear thyroid symptoms have TSH values within the conventional reference range (0.5–4.5 mIU/L) — a range derived from population data that includes people with subclinical thyroid disease. Functional medicine uses an optimal range of approximately 1–2 mIU/L and pairs TSH with a comprehensive panel that maps the full picture.
Conditions we commonly address
Underactive thyroid — whether overt or subclinical — investigated for root causes including iodine deficiency, selenium depletion, gut dysfunction, and autoimmune activity, not just treated with replacement hormone.
The most common cause of hypothyroidism — an autoimmune condition in which the immune system attacks thyroid tissue. We investigate and address the immune triggers driving antibody production, not just the resulting hormone deficiency.
TSH mildly elevated (or at the high end of "normal") with symptoms present but no formal hypothyroidism diagnosis. This is one of the most commonly missed and undertreated thyroid presentations.
Adequate T4 production but impaired conversion to active Free T3 — driven by chronic stress, cortisol elevation, gut dysbiosis, selenium deficiency, or liver dysfunction. TSH and T4 may appear normal while Free T3 is low.
Conversion of T4 toward inactive Reverse T3 rather than active Free T3 — blocking receptor sites and mimicking hypothyroidism despite normal TSH and T4 values. Often seen in chronic stress, caloric restriction, and illness.
Cortisol dysregulation directly suppresses thyroid function, reduces T4-to-T3 conversion, and can cause receptor resistance. We investigate the HPA axis alongside thyroid function — because they cannot be optimized independently.
How we work
A thorough investigation across the full thyroid cascade — from the brain signal to the cellular response.
We document your complete thyroid history — symptom timeline, prior lab results, medications, family history, stress patterns, gut health, and prior interventions that may inform current presentation.
TSH, Free T3, Free T4, Reverse T3, TPO antibodies, and thyroglobulin antibodies — paired with adrenal, nutritional, and inflammatory markers that influence thyroid function and conversion.
Targeted intervention addressing your specific mechanism — whether nutritional support, gut healing, adrenal rebalancing, immune modulation for Hashimoto's, or optimizing thyroid hormone therapy where indicated.
Thyroid function shifts with stress, season, pregnancy, and age. We retest strategically, refine protocols as your physiology changes, and track symptom resolution alongside lab values — not just one or the other.
What we test
A single TSH value cannot tell us whether you're making enough thyroid hormone, converting it properly, or whether your immune system is attacking the gland. We test the full picture — and interpret it against optimal, not just normal, ranges.
Discuss Your TestingTSH (Thyroid Stimulating Hormone)
Interpreted against an optimal range of ~1–2 mIU/L, correlated with symptoms — not simply evaluated against the broad 0.5–4.5 population reference range
Free T4 & Free T3
Measuring the unbound, bioavailable forms of both hormones — Free T4 (production) and Free T3 (active form at receptor sites)
Reverse T3 (RT3)
Identifying disproportionate conversion of T4 to the inactive blocking form — a critical marker missed by standard panels
TPO & Thyroglobulin Antibodies
Screening for Hashimoto's thyroiditis — detectable years before TSH becomes abnormal, enabling early intervention
Nutritional Cofactors
Selenium, iodine, zinc, iron/ferritin, and vitamin D — essential nutrients for thyroid hormone production, conversion, and receptor sensitivity
Adrenal & Cortisol Assessment
Four-point salivary cortisol or DUTCH panel — evaluating HPA axis function, which directly modulates thyroid hormone conversion and receptor responsiveness
A closer look
Hashimoto's thyroiditis is the most common autoimmune condition in the world — and one of the most mismanaged. Most patients are diagnosed, prescribed levothyroxine, and told their numbers look fine. The autoimmune process driving antibody production is rarely addressed.
Hashimoto's is not just a thyroid problem. It's an immune system problem that happens to target the thyroid. The trigger — whether a gut infection, molecular mimicry from gluten, an environmental toxin, or chronic stress — needs to be identified and removed. The immune dysregulation needs to be modulated. Simply replacing the hormone the gland can no longer produce doesn't stop the autoimmune destruction.
Our Hashimoto's protocol investigates and addresses immune triggers systematically, with the goal of lowering antibody levels and slowing — or in some cases halting — the autoimmune process.
Pillars of our Hashimoto's protocol
Identifying immune triggers including gluten sensitivity, intestinal permeability, infections (EBV, H. pylori), and environmental toxin burden
Restoring intestinal barrier integrity to reduce antigen exposure and systemic immune activation driving antibody production
Targeted nutraceuticals including selenium, vitamin D, omega-3s, and adaptogenic botanicals with evidence for antibody reduction
Autoimmune-informed nutrition — eliminating dietary triggers and supporting anti-inflammatory pathways that calm immune reactivity
Addressing cortisol dysregulation and HPA axis burden — chronic stress is both a trigger and perpetuator of autoimmune flares
Where thyroid replacement is needed, optimizing type (T4 alone vs. T4/T3 combination), dose, and timing based on labs and symptoms together
Common questions
Several things could be happening. Your TSH may be within the broad conventional range but not within an optimal functional range. Your T4 may be converting poorly to active Free T3. Your Reverse T3 may be blocking receptor sites. You may have early Hashimoto's with antibodies elevated before TSH becomes abnormal. Or your cells may have developed receptor resistance even with adequate hormone present. A TSH alone cannot distinguish between these scenarios — a full panel can.
This is extremely common. Levothyroxine (T4) requires adequate conversion to Free T3 to be clinically effective — and many patients on T4 monotherapy have low Free T3 despite normal TSH. Some patients do significantly better on a T4/T3 combination (such as Armour thyroid or liothyronine alongside levothyroxine). We can assess your conversion efficiency, check whether your current dose is optimized, and investigate whether underlying factors like gut dysfunction, selenium deficiency, or adrenal burden are impairing your response to medication.
Yes — in many patients, significantly. There is good clinical evidence that strict gluten elimination, selenium supplementation (200mcg/day), vitamin D optimization, and gut healing protocols can reduce TPO antibody levels meaningfully over 6–12 months. We also screen for and address specific triggers like EBV reactivation, H. pylori infection, and intestinal permeability that are known to perpetuate Hashimoto's. Antibody reduction doesn't just improve how you feel — it slows the progressive destruction of thyroid tissue.
For a meaningful subset of Hashimoto's patients — particularly those with elevated anti-gliadin antibodies, intestinal permeability, or confirmed celiac disease — yes, significantly. The mechanism is molecular mimicry: gliadin proteins in gluten structurally resemble thyroid tissue, potentially sustaining immune reactivity. We test for gluten sensitivity specifically (not just celiac disease) and evaluate intestinal permeability before recommending dietary changes. It's not universal, but for those with immune reactivity to gluten, elimination is often one of the highest-impact interventions available.
It depends entirely on the mechanism and how much thyroid tissue has been damaged. For patients with early Hashimoto's and preserved thyroid function, addressing the autoimmune drivers may allow dose reduction over time. For those with significant glandular damage or long-standing hypothyroidism, some level of thyroid support is likely permanent — but the goal is always to optimize how you feel on that support, not just normalize a number. Either way, medication alone is rarely the complete answer when root causes haven't been addressed.
Start with a free discovery call. We'll review your thyroid history, discuss what testing you've had, and map out what a functional thyroid investigation would look like for you.
Book a Free Discovery Call