Free T3: The Active Thyroid Hormone
Introduction Understanding the most powerful thyroid hormone and why it matters for energy, metabolism, and mood Most thyroid screening focuses on TSH (thyroid-stimulating hormone) or T4 (thyroxine), yet the complete thyroid picture requires understanding Free T3—the most biologically active thyroid hormone. While T4 is the storage form of thyroid hormone, Free T3 is the version […]