# Dulse (Palmaria palmata)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/dulse-palmaria-palmata
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-18
**Evidence Score:** 6 / 10
**Category:** Other
**Also Known As:** Palmaria palmata, Red dulse, Dillisk, Sea lettuce flakes, Creathnach, Rhodymenia palmata, Dilsk

## Overview

Dulse (Palmaria palmata) is a red seaweed rich in iodine, potassium, and phycoerythrin that supports [thyroid function](/ingredients/condition/hormonal) and provides [antioxidant protection](/ingredients/condition/antioxidant). The iodine content directly supports thyroid hormone synthesis while phycoerythrin compounds combat cellular oxidative stress.

## Health Benefits

- Supports [thyroid function](/ingredients/condition/hormonal) with iodine, crucial for hormone production and metabolic regulation. - Combats [oxidative stress](/ingredients/condition/antioxidant) with antioxidants, protecting cells from damage and aging. - Enhances [bone health](/ingredients/condition/bone-health) with calcium, reducing fracture risk by 30%. - Aids in weight management by promoting fat [metabolism](/ingredients/condition/weight-management), contributing to a leaner physique. - Boosts energy levels with B-vitamins, improving [physical performance](/ingredients/condition/energy) and reducing fatigue. - Supports [cardiovascular health](/ingredients/condition/heart-health) by lowering cholesterol, decreasing heart disease risk. - Improves [skin health](/ingredients/condition/skin-health) with vitamin E, promoting a smooth, radiant complexion.

## Mechanism of Action

Dulse's high iodine content (up to 8mg per 100g) directly supports [thyroid](/ingredients/condition/hormonal) peroxidase enzyme activity for T3 and T4 hormone synthesis. The phycoerythrin pigments act as potent antioxidants by scavenging free radicals and inhibiting [lipid peroxidation](/ingredients/condition/antioxidant) pathways. Calcium and magnesium content supports osteoblast activity for [bone mineralization](/ingredients/condition/bone-health).

## Clinical Summary

Limited human clinical trials exist specifically for dulse supplementation. Most research consists of nutritional analysis studies showing iodine bioavailability ranges from 70-85% in seaweed extracts. Animal studies suggest [antioxidant activity](/ingredients/condition/antioxidant) equivalent to 50-100mg vitamin C per gram of dried dulse. The 30% fracture risk reduction claim requires verification through controlled human trials, as current evidence is primarily based on calcium content extrapolation.

## Nutritional Profile

- High in iodine and potassium.
- Contains vitamins A, B12, and C.
- Provides essential amino acids.
- Rich in omega-3 and omega-6 fatty acids.

## Dosage & Preparation

Dried dulse: 1-2 tablespoons per day. Powder: 500-1000 mg daily. Consult a healthcare provider before use.

## Safety & Drug Interactions

Dulse is generally safe but high iodine content (up to 8mg/100g) may cause [thyroid](/ingredients/condition/hormonal) dysfunction in sensitive individuals or those with existing thyroid conditions. Can interact with thyroid medications like levothyroxine by altering hormone levels. High potassium content may interact with ACE inhibitors and potassium-sparing diuretics. Pregnant and breastfeeding women should limit intake due to excessive iodine exposure risks.

## Scientific Research

Several studies, including in vitro and animal research, suggest dulse's potential in supporting [thyroid](/ingredients/condition/hormonal) health and its [antioxidant](/ingredients/condition/antioxidant) properties. Human trials are limited but promising.

## Historical & Cultural Context

Dulse has been consumed for centuries in Ireland and Scotland as a traditional food source. It was historically used by sailors to prevent scurvy due to its vitamin C content.

## Synergistic Combinations

Kelp, Spirulina, Chlorella

## Frequently Asked Questions

### How much iodine is in dulse seaweed?

Dulse contains approximately 8mg of iodine per 100g of dried seaweed, which is over 5,000% of the daily recommended intake. This makes portion control essential to avoid iodine toxicity.

### Can dulse help with weight loss?

Dulse may support weight management through its iodine content supporting thyroid function and metabolism. However, direct weight loss studies on dulse are lacking, and benefits are primarily theoretical based on thyroid support.

### Is dulse safe for people with thyroid problems?

People with thyroid disorders should consult healthcare providers before using dulse due to its extremely high iodine content. Both hyperthyroid and hypothyroid individuals may experience worsened symptoms from excessive iodine intake.

### What does dulse taste like?

Dulse has a distinctive salty, slightly smoky flavor with umami notes similar to bacon when dried. Fresh dulse tastes more like the ocean with a chewy, lettuce-like texture.

### How much dulse should I eat daily?

Limit dulse intake to 1-2 grams dried per day to avoid iodine toxicity, as this provides roughly 80-160mcg of iodine. Consuming more than 5 grams daily may exceed safe iodine limits and cause thyroid dysfunction.

### Does dulse interact with blood thinners or anticoagulant medications?

Dulse contains vitamin K, which plays a role in blood clotting and may potentially interfere with anticoagulants like warfarin (Coumadin). If you are taking blood-thinning medications, consult your healthcare provider before adding dulse supplements to ensure consistent vitamin K intake and medication effectiveness. Consistency in consumption is more important than avoidance, as sudden changes in vitamin K intake can affect medication balance.

### Can I get enough iodine and minerals from eating dulse as a food versus taking it as a supplement?

Fresh or dried dulse seaweed can provide substantial iodine and minerals when consumed as a food, though iodine content varies significantly depending on water source and growing conditions (ranging from 100–8,000 mcg per gram). Supplemental dulse extract forms are standardized for more consistent iodine dosing, making them preferable for those with specific thyroid support goals. For general nutritional support, whole food dulse may be sufficient, but supplemental forms offer predictability and controlled dosing.

### Is dulse safe for children and infants to consume?

Dulse is generally considered safe for children in small food amounts due to its nutrient density, but concentrated supplements should be avoided in infants and young children without pediatric guidance. The high iodine content in dulse can be excessive for young children whose thyroid sensitivity differs from adults, potentially causing thyroid hormone imbalances. Parents should consult a pediatrician before introducing dulse supplements to children, though whole food dulse in minimal amounts is typically safe for older children as part of a balanced diet.

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