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T3 (liothyronine) and T4 (levothyroxine) bind to nuclear thyroid receptors, regulating metabolism, energy production, heart rate, body temperature, brain function, and virtually every organ system.
Standard commercial thyroid medications (Synthroid, Armour) come in fixed strengths. Compounding allows precise T3/T4 ratios, sustained-release T3 formulations to avoid peaks and crashes, allergen-free capsules, and ultra-low doses for sensitive patients.
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The thyroid gland produces T4 (thyroxine) and T3 (triiodothyronine) — hormones that regulate nearly every metabolic process in the body. When the thyroid underperforms (hypothyroidism), replacement therapy is needed.
Many patients do not convert T4 to active T3 efficiently due to genetic variants (DIO2 gene), chronic illness, or nutritional deficiencies. These patients often feel best on combined T3/T4 therapy or natural desiccated thyroid (NDT).
Compounding pharmacies create custom thyroid formulations for patients who don't respond well to standard commercial products, need specific T3/T4 ratios, or require slow-release T3 to avoid the short half-life peaks of immediate-release Cytomel.
Nuclear Receptor Binding
T3 and T4 bind to thyroid hormone nuclear receptors (TR-alpha and TR-beta), regulating gene expression across virtually all body systems.
T4-to-T3 Conversion
T4 is a prohormone converted to active T3 by deiodinase enzymes. Impaired conversion is common and often goes undetected on standard TSH-only testing.
Slow-Release T3
Compounded sustained-release T3 extends the 8-hour half-life of T3, providing steady levels throughout the day and avoiding the stimulatory peaks of immediate-release liothyronine.
Primary Hypothyroidism: Hashimoto's thyroiditis, post-thyroidectomy, radioactive iodine treatment
Poor T4 Converters: Patients who remain symptomatic on levothyroxine alone
Sensitivity/Allergy: Patients with fillers/dyes in commercial products
Pediatric dosing: Ultra-precise doses not available commercially
T4 (Levothyroxine): 25–200mcg daily, titrated by TSH, free T4, and symptoms
T3 (Liothyronine): 5–25mcg daily (immediate release) or slow-release equivalents
Combined T3/T4: Provider-determined ratios based on labs and symptom response
Thyroid dosing requires careful titration and regular lab monitoring (TSH, free T3, free T4).
Signs of over-replacement:
Signs of under-replacement:
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