# Palmaria palmata (Dulse)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/palmaria-palmata
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-29
**Evidence Score:** 2 / 10
**Category:** Marine-Derived
**Also Known As:** Dulse, Red dulse, Dillisk, Dilsk, Sea lettuce flakes, Palmaria palmata, Atlantic dulse, Pacific dulse, Red seaweed dulse

## Overview

Dulse (Palmaria palmata) is a red seaweed containing phenolic compounds that demonstrate [anti-inflammatory](/ingredients/condition/inflammation) effects by reducing cytokine production in immune cells. The algae's EPA-rich lipids and protein content provide additional nutritional value, though human clinical evidence remains limited.

## Health Benefits

• [Anti-inflammatory](/ingredients/condition/inflammation) potential shown in preclinical studies: phenolic extracts reduced inflammatory markers (TNF-α, IL-1β, IL-6) by 25-75% in isolated immune cells (preliminary evidence)
• EPA-rich lipid content provides theoretical [antioxidant](/ingredients/condition/antioxidant) support (no human trials)
• Protein-dense nutrition suitable for food/feed applications (compositional data only)
• Phycobiliprotein content may reduce nitric oxide production in immune cells (animal models only)
• WARNING: One human trial found 5g/day increased inflammation markers and triglycerides (negative evidence)

## Mechanism of Action

Dulse's phenolic compounds, including flavonoids and phlorotannins, suppress [pro-inflammatory cytokine](/ingredients/condition/inflammation) production by inhibiting NF-κB and MAPK signaling pathways in immune cells. The seaweed's EPA content theoretically supports antioxidant pathways by scavenging [reactive oxygen species](/ingredients/condition/antioxidant). These bioactive compounds work synergistically to modulate inflammatory cascades at the cellular level.

## Clinical Summary

Current evidence for dulse is limited to preclinical in vitro studies using isolated immune cell cultures. Phenolic extracts demonstrated 25-75% reduction in inflammatory markers TNF-α, IL-1β, and IL-6 in laboratory conditions. No human clinical trials have been conducted to validate these [anti-inflammatory](/ingredients/condition/inflammation) effects or establish effective dosing protocols. The evidence strength remains preliminary and requires human studies for clinical validation.

## Nutritional Profile

{"macronutrients": {"protein": "Up to 21% of dry weight", "lipids": "Approximately 1-3% of dry weight, rich in EPA (eicosapentaenoic acid)", "carbohydrates": "Approximately 50% of dry weight, including dietary fiber"}, "micronutrients": {"vitamins": {"vitamin A": "0.5 mg per 100g", "vitamin C": "3 mg per 100g", "vitamin B12": "0.5 \u00b5g per 100g"}, "minerals": {"iodine": "Up to 6 mg per 100g", "iron": "2 mg per 100g", "calcium": "70 mg per 100g", "magnesium": "220 mg per 100g", "potassium": "800 mg per 100g"}}, "bioactive_compounds": {"phenolic compounds": "Approximately 1-2% of dry weight", "phycobiliproteins": "Up to 15% of dry weight"}, "bioavailability_notes": "The bioavailability of iodine and other minerals may be affected by the presence of dietary fiber and other compounds. Cooking methods can influence the retention and absorption of vitamins and minerals."}

## Dosage & Preparation

Human trial: 5g/day whole dried powder (adverse effects noted). Preclinical extracts: 25-100 µg/mL phenolic extract (DULEXT), 50-500 µg/mL sequential fractions. No standardization criteria established. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Dulse is generally recognized as safe when consumed as food, but supplement safety data is limited. High iodine content may interfere with [thyroid](/ingredients/condition/hormonal) medications and cause hyperthyroidism in sensitive individuals. Potential interactions with anticoagulant drugs due to vitamin K content require medical supervision. Pregnancy and breastfeeding safety has not been established through clinical studies.

## Scientific Research

Limited human evidence exists, with one controlled trial finding that 5g/day dulse in bread actually increased inflammation (elevated CRP and cytokines), raised triglycerides, and disrupted [thyroid function](/ingredients/condition/hormonal) with elevated TSH. Preclinical studies in mouse macrophages (RAW 264.7) and human neutrophils showed [anti-inflammatory](/ingredients/condition/inflammation) effects at 25-500 µg/mL extract concentrations (PMC6891576, PMC10221991, PMID: 28873715).

## Historical & Cultural Context

Traditional use information not documented in available research. Modern applications focus on edible seaweed for food/feed, nutraceuticals, and potential [anti-inflammatory](/ingredients/condition/inflammation) products. No specific traditional medicine systems or historical duration of use identified.

## Synergistic Combinations

Other seaweeds, omega-3 fatty acids, [anti-inflammatory](/ingredients/condition/inflammation) herbs, iodine-containing supplements, marine-sourced [antioxidant](/ingredients/condition/antioxidant)s

## Frequently Asked Questions

### How much dulse should I take daily?

No standardized dosage exists due to lack of human studies. Traditional food consumption ranges 1-5 grams daily, but supplement dosing requires medical guidance given iodine content variability.

### Can dulse help with arthritis inflammation?

Laboratory studies show 25-75% reduction in inflammatory markers, but no human arthritis trials exist. The anti-inflammatory mechanism suggests potential, but clinical evidence is needed.

### Is dulse safe with blood thinners?

Dulse contains vitamin K which may interfere with warfarin and other anticoagulants. Consult healthcare providers before combining dulse supplements with blood-thinning medications.

### What makes dulse different from other seaweeds?

Dulse has uniquely high protein content (up to 35%) and specific phenolic compound profile compared to kelp or nori. Its EPA-rich lipids also distinguish it from most other edible seaweeds.

### Does dulse contain heavy metals?

Like all seaweeds, dulse can bioaccumulate heavy metals from ocean water. Quality varies by harvesting location and processing methods, making third-party testing important for supplements.

### What is the evidence quality for dulse's anti-inflammatory effects?

Most anti-inflammatory research on dulse comes from preclinical studies using isolated immune cells, where phenolic extracts showed 25-75% reductions in inflammatory markers like TNF-α and IL-1β. However, these findings have not been confirmed in human clinical trials, making them preliminary evidence at best. Current evidence is insufficient to make definitive claims about dulse's anti-inflammatory benefits in people without further research.

### Is dulse safe for pregnant or breastfeeding women?

While dulse is a whole food with a long history of culinary use, specific safety data for pregnancy and breastfeeding is limited. The high iodine content in seaweeds like dulse warrants caution, as excessive iodine during pregnancy may affect fetal thyroid development. Pregnant or breastfeeding women should consult a healthcare provider before supplementing with dulse to determine appropriate intake levels.

### How does dulse's bioavailability compare between whole food and extract forms?

Dulse bioavailability varies significantly between forms—whole dulse provides nutrients in their naturally bound state with food matrix effects, while concentrated extracts isolate specific compounds like phenolics and phycobiliproteins for potentially faster absorption. However, no direct comparative human studies exist measuring absorption rates of whole dulse versus extract preparations. The optimal form likely depends on individual digestive capacity and the specific health outcome being targeted.

---

*Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com*
*License: CC BY-NC-SA 4.0 — Attribution required. Commercial use: admin@hermeticasuperfoods.com*