Thyroid Support
Your thyroid runs
on a pathway.
From the signal in your brain to the energy in your cells, thyroid hormones move through a chain of steps — and specific nutrients sit at each one. Here's that pathway, ingredient by ingredient, with the science kept honest.
Four steps, signal to cell
Tap each step to see what happens — and which Thyrox ingredients sit alongside it. We flag every statement: ✓ authorised claim or ℹ biology only.
T4 → T3, and why selenium matters
Most of what the thyroid releases is T4 — a storage form. The body converts it into the active form, T3, using selenium-dependent enzymes called deiodinases.
Selenium is a cofactor for the deiodinase enzymes involved in converting T4 to active T3, and it's part of the antioxidant systems that protect thyroid tissue. That's why Thyrox is built around 100 µg of selenium (182% NRV) as well-absorbed L-selenomethionine.
Every ingredient, honestly labelled
Each card shows the dose, the form, and only the health claims that are authorised for that nutrient. Where an ingredient has no authorised claim, we say so and describe its role for context only.
Why Thyrox is iodine-free
IODINE
More isn't always better
Iodine is a raw material the thyroid normally uses to build its hormones. But many people in the UK already get enough from diet, and with iodine, the dose window matters — too much can be as much of a problem as too little.
Thyrox deliberately leaves iodine out and supports the pathway through selenium instead, which is involved in converting and protecting thyroid hormones. If you have a diagnosed thyroid condition or take thyroid medication, talk to your doctor before adding any iodine — or any new supplement.
The bits that don't fit on the front label
Thyroid support, answered
Support the pathway, not the hype.
Thyrox is built around the nutrients with a genuine, authorised role in the thyroid and hormonal pathway — selenium first, no iodine, nothing padding the label.
Disclaimer: This page is for general education and is not medical advice. Health statements reflect authorised GB/EU nutrient claims and apply to the named nutrient, not to any specific outcome. L-Tyrosine and Myo-Inositol carry no authorised health claim and are described for biological context only. Food supplements are not a substitute for a varied, balanced diet and healthy lifestyle. If you have a thyroid condition, are pregnant, or take any medication, consult a qualified healthcare professional before use.