# Iodine

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/iodine
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-15
**Evidence Score:** 4 / 10
**Category:** Mineral
**Also Known As:** Iodine, Elemental Iodine, Iodide

## Overview

Iodine is an essential micronutrient crucial for the synthesis of [thyroid](/ingredients/condition/hormonal) hormones, thyroxine (T4) and triiodothyronine (T3). These hormones, formed from iodide by thyroid peroxidase, orchestrate [metabolic rate](/ingredients/condition/weight-management), growth, and neurological development.

## Health Benefits

- Supports Thyroid Health: Crucial for the production of thyroxine (T4) and triiodothyronine (T3), regulating metabolism, [thermogenesis](/ingredients/condition/weight-management), and systemic growth.
- Modulates Metabolic Regulation: Influences energy expenditure, lipid metabolism, and temperature control through its impact on thyroid hormone output.
- Aids [Cognitive](/ingredients/condition/cognitive) Development: Supports brain formation and neural connectivity, especially during fetal and infant stages, preventing developmental delays.
- Enhances [Immune Function](/ingredients/condition/immune-support): Contributes to innate immunity and the body's antimicrobial defense, particularly in mucosal tissues.
- Facilitates Hormonal Harmony: Stabilizes [thyroid function](/ingredients/condition/hormonal), influencing reproductive and adrenal systems to promote overall endocrine balance.
- Prevents Deficiency Symptoms: Adequate intake prevents goiter, hypothyroidism, cognitive impairment, and fatigue, especially critical during pregnancy for fetal brain development.

## Mechanism of Action

Iodide is actively transported into [thyroid](/ingredients/condition/hormonal) cells via the sodium/iodide cotransporter, then oxidized by thyroid peroxidase (TPO). This oxidized iodine is incorporated into tyrosine residues within thyroglobulin, leading to the synthesis of thyroid hormones, thyroxine (T4) and triiodothyronine (T3).

## Clinical Summary

Extensive research, including epidemiological studies and clinical trials, firmly establishes iodine's critical role in human health. These studies consistently demonstrate that adequate iodine intake is essential for [thyroid](/ingredients/condition/hormonal) hormone synthesis, impacting [metabolic rate](/ingredients/condition/weight-management), growth, and neurological development. Clinical findings highlight that both iodine deficiency and excess can lead to thyroid dysfunction, underscoring the importance of optimal intake for maintaining euthyroid status.

## Nutritional Profile

- Key Bioactive: Iodide (I-), the form absorbed and utilized by the [thyroid](/ingredients/condition/hormonal) gland.
- Food Sources: Seaweed (kelp, nori, wakame), iodized salt, cod, dairy, eggs, and fortified grains.
- Absorption Factors: Enhanced by selenium and tyrosine; potentially reduced by goitrogens in excessive raw cruciferous vegetable intake.

## Dosage & Preparation

- Common Forms: Available as potassium iodide supplements, often found in multivitamin/mineral complexes, and in iodized salt.
- Dosage: Recommended daily allowance (RDA) is 150 mcg for adults; 220 mcg for pregnant women, and 270 mcg for lactating women.
- Timing: Can be taken with or without food.
- Important Note: Excessive intake can also lead to [thyroid](/ingredients/condition/hormonal) dysfunction; consult a healthcare professional for appropriate dosage.

## Safety & Drug Interactions

Excessive iodine intake can lead to adverse effects such as goiter, hypothyroidism, or hyperthyroidism, particularly in individuals with pre-existing thyroid conditions or autoimmune thyroid disease. Iodine interacts with certain medications like antithyroid drugs, amiodarone, and lithium, potentially altering [thyroid function](/ingredients/condition/hormonal). During pregnancy and lactation, iodine is crucial for fetal development, but both deficiency and excess can be harmful, necessitating careful medical guidance for supplementation.

## Scientific Research

Extensive scientific research, including epidemiological studies and clinical trials, firmly establishes iodine's essential role in [thyroid](/ingredients/condition/hormonal) hormone synthesis and its profound impact on [metabolic rate](/ingredients/condition/weight-management), growth, and neurological development. Studies consistently demonstrate that adequate iodine intake is crucial for preventing goiter and hypothyroidism, particularly highlighting its critical importance for fetal brain development during pregnancy. The evidence base is robust, supporting its status as a vital trace mineral.

## Historical & Cultural Context

The critical role of iodine in human health was recognized in the early 19th century with its discovery and subsequent use in treating goiter. Large-scale public health initiatives, such as the iodization of salt, began in the early 20th century to combat widespread iodine deficiency, particularly in landlocked regions. This modern intervention has significantly reduced the incidence of iodine deficiency disorders globally, making it a cornerstone of preventative nutrition.

## Synergistic Combinations

Role: Mineral cofactor
Intention: Energy & [Metabolism](/ingredients/condition/weight-management) | Cognition & Focus
Primary Pairings: - Selenium (L-selenomethionine)
- Zinc (Zinc picolinate)
- Tyrosine (L-Tyrosine)
- Vitamin B12 (Cobalamin)

## Known Interactions

| Substance | Severity | Summary | URL |
|---|---|---|---|
| Boron | SAFE | 🟢 SAFE — Iodine and Boron can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/boron |
| Copper | SAFE | 🟢 SAFE — Iodine and Copper can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/copper |
| Chamomile | SAFE | 🟢 SAFE — Iodine and Chamomile can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/chamomile |
| Peppermint | SAFE | 🟢 SAFE — Iodine and Peppermint can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/peppermint |
| Hibiscus | SAFE | 🟢 SAFE — Iodine and Hibiscus can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/hibiscus |
| Passionflower | SAFE | 🟢 SAFE — Iodine and Passionflower can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/passionflower |
| Lemon Balm | SAFE | 🟢 SAFE — Iodine and Lemon Balm can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/lemon-balm |
| Skullcap | SAFE | 🟢 SAFE — Iodine and Skullcap can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/skullcap |
| Dong Quai | SAFE | 🟢 SAFE — Iodine and Dong Quai can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/dong-quai |
| Black Cohosh | SAFE | 🟢 SAFE — Iodine and Black Cohosh can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/black-cohosh |
| Evening Primrose Oil | SAFE | 🟢 SAFE — Iodine and Evening Primrose Oil can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/evening-primrose-oil |
| Vitex | SAFE | 🟢 SAFE — Iodine and Vitex can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/vitex |
| Shatavari | SAFE | 🟢 SAFE — Iodine and Shatavari can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/shatavari |
| Triphala | SAFE | 🟢 SAFE — Iodine and Triphala can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/triphala |
| Neem | SAFE | 🟢 SAFE — Iodine and Neem can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/neem |
| Gotu Kola | SAFE | 🟢 SAFE — Iodine and Gotu Kola can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/gotu-kola |
| Tribulus Terrestris | SAFE | 🟢 SAFE — Iodine and Tribulus Terrestris can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/tribulus-terrestris |
| Hawthorn Berry | SAFE | 🟢 SAFE — Iodine and Hawthorn Berry can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/hawthorn-berry |
| Olive Leaf Extract | SAFE | 🟢 SAFE — Iodine and Olive Leaf Extract can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/olive-leaf-extract |
| Oregano Oil | SAFE | 🟢 SAFE — Iodine and Oregano Oil can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/oregano-oil |

## Frequently Asked Questions

### Why is iodine essential for my body?

Iodine is critical because it's a fundamental component of thyroid hormones, thyroxine (T4) and triiodothyronine (T3). These hormones are vital for regulating metabolism, energy production, body temperature, and the proper growth and development of the body, especially the brain.

### How does iodine support thyroid health?

Iodine supports thyroid health by being the primary building block for thyroid hormones. Specifically, iodide is transported into thyroid cells and, with the help of thyroid peroxidase (TPO), is incorporated into thyroglobulin to synthesize T4 and T3, which are then released to regulate various bodily functions.

### What happens if I don't get enough iodine?

Insufficient iodine intake can lead to iodine deficiency disorders. The most common manifestations include goiter (enlargement of the thyroid gland) and hypothyroidism, characterized by symptoms like fatigue, weight gain, and cold intolerance. Severe deficiency during pregnancy can impair fetal neurological development.

### Can I have too much iodine?

Yes, excessive iodine intake can also be detrimental. High doses can paradoxically inhibit thyroid hormone synthesis, leading to hypothyroidism, or trigger hyperthyroidism in susceptible individuals. It can also exacerbate autoimmune thyroid conditions and cause symptoms like an iodine-induced goiter.

### What are common dietary sources of iodine?

Common dietary sources include seafood (fish, shellfish), seaweed (kelp, nori), dairy products, and eggs. Iodized salt is a major contributor to iodine intake in many populations, as iodine is added to help prevent deficiency.

### What is the difference between iodine from kelp supplements and potassium iodide supplements?

Kelp and other seaweed sources provide iodine in organic form bound to amino acids, but iodine content varies widely and unpredictably between batches. Potassium iodide is a standardized inorganic form that provides consistent, measurable dosing and is the most commonly used in clinical and public health applications. Potassium iodide also has superior bioavailability and stability compared to seaweed-based sources.

### Is iodine supplementation safe during pregnancy and breastfeeding?

Iodine is essential during pregnancy and lactation for fetal brain development and preventing maternal goiter, making adequate intake critical during these periods. The recommended dietary allowance increases to 220 mcg daily during pregnancy and 290 mcg during breastfeeding. Supplementation within recommended ranges is considered safe and beneficial, though excessive intake should be avoided.

### Who is most at risk for iodine deficiency and should consider supplementation?

People in regions with iodine-poor soil, those avoiding iodized salt, vegans/vegetarians with limited seafood intake, and individuals with certain thyroid conditions are at higher risk for deficiency. Pregnant women, nursing mothers, and people with malabsorption disorders also face increased vulnerability. A healthcare provider can test iodine status through urinary iodine levels to determine if supplementation is necessary.

## References

Sources: pubmed.ncbi.nlm.nih.gov

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*Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com*
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