Temperature method by Broda Barnes
This simple measurement shows whether your body truly has enough active thyroid hormones—unlike what blood values might suggest.
In just 5 minutes, you’ll have an initial indication.
So simple, yet so telling
“If your average temperature is below 36.8 degrees Celsius, then you know your thyroid is struggling—completely independent of your blood values.” – Rolf Jansen-Rosseck.
The temperature method was developed by Broda Barnes, who, after studying over 70,000 patients, discovered that body temperature is the most reliable indicator of thyroid function—far more telling than lab values. He proved that patients with “normal” lab results could still suffer from hypothyroidism.
It’s that simple
Measure your temperature
3–4 times a day under your tongue (note: measure for 5 minutes, not just until the beep!)
Enter the values
Use our free temperature chart to record your values for at least 7 days
Identify the pattern
Is your average below 36.8°C? That could be the proof you need!