04/02/2026
The one hormone most doctors never test for weight gain.
You've had your thyroid checked. TSH is 'normal.' But you still have all the symptoms.
Here’s what you may be missing.
Meet Reverse T3 (rT3). Think of it as the emergency brake for your metabolism. When your body is under stress (physical or emotional), it converts your active thyroid hormone (T3) into this inactive form, rT3. This slows everything down to conserve energy.
High rT3 can be a major hidden cause of weight loss resistance, fatigue, and brain fog, even when your other thyroid labs look fine. Most standard panels don't include it, leaving you without a crucial piece of the puzzle.
Getting the full picture means looking beyond the basics. A comprehensive panel that includes Free T3, Free T4, and Reverse T3 is essential to understanding how your thyroid is truly functioning.
Disclaimer: This is not medical advice. Consult with a qualified healthcare professional for diagnosis and treatment.
Stop guessing. Start testing what truly matters. See our comprehensive hormone panels and discover our cutting-edge approach via the link in our bio.