Here’s the behind-the-scenes truth 👇
When you’re on thyroid medication, your labs won’t look the same as when you’re off.
Why? Because you now have a “second thyroid.”
What changes on meds:
- TSH → usually lower (optimal range: 0.5-2.5mU/L).
- Free T4 → may sit ~10–13 (instead of 16–18 pmol/L)
- Free T3 → may look “low” (around 3 pmol/L), but pushing it up to 4.5 pmol/L with meds can actually make you feel worse.
👉 Doctors sometimes chase “perfect labs” instead of function.
The deeper layer 🧠
Free T3 isn’t active until it gets into the cell, binds, and activates DNA.
That requires:
- healthy cell membranes (fat-soluble vitamins),
- proper methylation (think B Vitamins),
- and mitochondrial function (mitochondrial function and thyroid hormones have a bidirectional relationship).
If there’s resistance at the cellular level, you can have “normal” labs, but still feel hypo.
Why symptoms matter most
Lab ranges shift with food, circadian rhythm, and even your cycle.
And TSH? Not always reliable in the presence of inflammation, oxidative stress, or mitochondrial dysfunction.
So the real gold standard isn’t just the ranges on your lab report — it’s how you feel.
What to monitor: Energy, mood, metabolism, and digestion.
Final Thoughts
Don’t let numbers alone dictate your care.
On thyroid meds, “normal” looks different.
And if your labs say you’re fine but you don’t feel fine? That’s a sign to dig deeper.
👉 This is where naturopathic medicine shines: we treat function and symptoms, not just the numbers on the page.
