Organic Dulse
Also known as: Dulse, Atlantic dulse, Red dulse, Palmaria palmata
Overview
Organic dulse (*Palmaria palmata*) is a red seaweed harvested primarily from the North Atlantic coasts, prized for its rich nutrient profile. It is consumed as both a food and dietary supplement. Dulse is characterized by its high mineral content, including iodine, potassium, and calcium, as well as antioxidants, omega-3 and omega-6 fatty acids, and bioactive compounds with potential anti-inflammatory properties. It is often used to support mineral replenishment, antioxidant defense, and thyroid health due to its iodine content. While seaweed supplementation, in general, has been studied, specific high-quality randomized controlled trials (RCTs) focusing solely on dulse are somewhat limited. Therefore, evidence often extrapolates from broader seaweed research to infer dulse's potential benefits. Dulse is available in various forms, including whole leaf, flakes, powder, and capsules.
Benefits
Seaweed supplementation, including species related to dulse, has demonstrated improvements in liver function markers (ALT, AST), metabolic parameters (body weight, BMI, lipid profiles), and inflammation markers in clinical trials involving patients with non-alcoholic fatty liver disease (NAFLD). Dulse is a significant source of iodine, which is essential for thyroid hormone synthesis, potentially mitigating the risk of iodine deficiency. Its antioxidant activity may protect cells from oxidative stress, bolstering immune resilience. The anti-inflammatory properties may alleviate swelling and inflammation, potentially benefiting skin health and allergy symptoms. The mineral content supports bone health and metabolic functions, while omega-3 and omega-6 fatty acids contribute to cardiovascular and nervous system health. Individuals with iodine deficiency or thyroid dysfunction may particularly benefit from dulse supplementation, although caution is advised due to iodine's potent effects. Patients with metabolic syndrome or NAFLD may also experience improved liver and metabolic markers from seaweed supplementation.
How it works
Dulse's mechanism of action involves several biological pathways. Its antioxidant compounds scavenge free radicals, reducing oxidative stress. Iodine supports thyroid hormone synthesis, regulating metabolism and growth. Anti-inflammatory bioactives modulate inflammatory pathways, potentially reducing cytokine production. The minerals and fatty acids contribute to enzymatic functions and cellular signaling. Dulse interacts with the endocrine system (thyroid gland) via its iodine content, the hepatic system through modulation of liver enzymes and lipid metabolism, and the immune system via antioxidant and anti-inflammatory effects. While the exact molecular targets are not fully elucidated, they likely involve thyroid peroxidase (iodine metabolism), NF-κB and cytokine pathways (inflammation), and antioxidant enzyme systems.
Side effects
Dulse is generally considered safe when consumed in typical dietary amounts. However, caution is advised with high intake due to its iodine content. Common side effects are not well-documented in clinical trials, though some individuals may experience mild gastrointestinal discomfort. Uncommon side effects include the potential for thyroid hormone imbalance if consumed in excess, particularly in those with pre-existing thyroid disorders. Rare side effects may include allergic reactions. Dulse's potassium content may increase the effects and side effects of digoxin. Its iodine content can interact with thyroid hormone replacement therapy, antithyroid drugs, and iodine-containing medications like amiodarone, potentially altering thyroid function. Patients with hyperthyroidism or iodine sensitivity should avoid high intake. Those on thyroid medications should consult healthcare providers before use. Pregnant and breastfeeding women should exercise caution due to iodine levels, and children and individuals with thyroid disease require medical supervision.
Dosage
A minimum effective dose for dulse specifically is not well established; general seaweed supplementation studies use doses ranging from 1 to 3 grams daily. Typical culinary use provides small amounts, while supplements may provide 500 mg to 3 g daily. Due to limited data, excessive iodine intake (>1100 mcg/day) should be avoided to prevent thyroid dysfunction. Dulse can be consumed with meals to aid absorption and reduce gastrointestinal discomfort. It is available in powder, flakes, and capsules, with bioavailability potentially varying among forms. The presence of dietary fiber may affect mineral absorption, and cooking can reduce iodine content. No specific cofactors are required, but a balanced diet supports nutrient utilization.
FAQs
Is dulse safe for thyroid health?
Dulse contains iodine, which supports thyroid function but can cause imbalance if consumed excessively or combined with thyroid medications. Consult a healthcare provider if you have thyroid issues.
How long until benefits appear?
Benefits on metabolic and liver markers may appear after weeks to months of consistent intake, as observed in seaweed supplementation studies. Individual results may vary.
Can dulse help with inflammation?
Dulse contains anti-inflammatory compounds, but clinical evidence specific to dulse is limited, and more research is needed to confirm its efficacy in reducing inflammation.
Does dulse detox heavy metals?
Some claims suggest dulse can bind heavy metals in the gut, aiding excretion, but robust clinical evidence supporting this claim is currently lacking. More research is needed.
Research Sources
- https://pmc.ncbi.nlm.nih.gov/articles/PMC9850310/ – This RCT on seaweed supplementation in NAFLD patients (sample size >30 per group) showed significant reductions in liver enzymes (ALT, AST), triglycerides, HbA1c, and insulin resistance markers compared to the control group (p < 0.005). The study's limitations include the use of mixed seaweed extracts rather than dulse alone. The research is of moderate to high quality.
- https://pmc.ncbi.nlm.nih.gov/articles/PMC6551690/ – This narrative review summarizes the nutritional composition and health effects of edible seaweeds, including dulse. It highlights antioxidant, anti-inflammatory, and mineral benefits but notes limited RCT data on individual species, calling for more rigorous clinical trials to investigate specific effects. The review is of moderate quality.
- https://www.webmd.com/vitamins/ai/ingredientmono-1628/dulse – WebMD provides safety and drug interaction information relevant to dulse's iodine and potassium content. It emphasizes caution in individuals with thyroid disease and those taking certain medications. The information is based on clinical pharmacology data and case reports, and is considered to be of moderate quality.
- https://letsliveitup.com/blogs/supergreens/what-is-dulse – This article provides a general overview of dulse, highlighting its potential antioxidant and anti-inflammatory properties. It also mentions the mineral content that supports bone health and metabolic functions. The article is of lower quality compared to peer-reviewed research.
- https://centralsun.com/product/organic-atlantic-dulse-powder/ – This is a product page for organic Atlantic dulse powder. It highlights the nutritional benefits of dulse, such as being a source of iodine, potassium, and other minerals. The information is primarily marketing-oriented and not a reliable research source.
Supplements Containing Organic Dulse

Green SuperFood Raw Reserve
Amazing Grass

CapraGreens
Mt. Capra

Easy Being Green
Ora

Ladies' One
Bluebonnet

Ladies' One
Bluebonnet

Ladies' One
Bluebonnet

Men's One
Bluebonnet

Men's One
Bluebonnet

Men's One
Bluebonnet

Daily Build
Genesis Pure

Daily Build
Genesis Pure

Smart Greens + Energy Mixed Berry
GNC Earth Genius
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