The Iodine Codex

How iodine shapes the thyroid and metabolism — an illuminated guide

A compact work that explains why a single trace element has a say in the activity of every cell in the body — and what happens when intake falls short.

An inconspicuous element, often overlooked

Iodine is present in the body only in tiny amounts — and yet it is indispensable for the formation of the thyroid hormones T3 and T4. These hormones, in turn, govern the basal metabolic rate of nearly every cell in the body.

Modern eating habits, depleted soils and the decline of iodized foods make adequate iodine intake a quiet challenge. This guide shows what science actually knows about it.

150 µg
Recommended daily intake for adults according to EFSA reference values
3
EFSA-authorized health claims on iodine in this guide
38
Pages of biochemically grounded explanation, illustrated in manuscript style

Three authorized claims about iodine

Each of the following statements has been reviewed and authorized by the European Food Safety Authority (EFSA) under Regulation (EU) No 432/2012.

I

Thyroid Function

EFSA-authorized claim: Iodine contributes to the normal production of thyroid hormones and normal thyroid function.

The thyroid needs iodine as the basic building block for the hormones T3 and T4. These govern basal metabolism, body temperature and protein synthesis in nearly all tissues.

Energy Metabolism

EFSA-authorized claim: Iodine contributes to normal energy-yielding metabolism.

Through the thyroid hormones, iodine influences how efficiently nutrients are converted into usable energy. Adequate intake is therefore part of the metabolic foundation of everyday life.

Nervous System

EFSA-authorized claim: Iodine contributes to the normal functioning of the nervous system.

Thyroid hormones are involved in the maturation and maintenance of neural structures. Adequate iodine intake is therefore one of the basic prerequisites for normal nervous system function.

What the guide covers

Chapter I
The Biochemistry of the Thyroid
How iodine is converted into hormones and the part the pituitary gland plays in it.
Chapter II
Everyday Sources of Iodine
Which foods naturally contain iodine — and where intake often falls short.
Chapter III
Reading Reference Values Correctly
What the reference values set by EFSA mean and how to put them in context.
Chapter IV
Metabolism & Energy
The connection between thyroid hormones and daily energy expenditure.
Chapter V
Understanding Interactions
Which other nutrients can influence how the body uses iodine.
Chapter VI
Bibliography
Every statement is backed by scientific sources and the underlying EFSA regulation.
The Iodine Codex I Illuminated Guide 38 pages · PDF

The Iodine Codex

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