Last verified: today
Dulse
Also known as: Palmaria palmata, red dulse, sea lettuce flakes, Palmaria sp.
Evidence under review. — Not yet rated
Edible red seaweed with lab-shown antioxidant activity, but no human clinical trials to back health claims.
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What it does
Dulse is an edible red seaweed (Palmaria palmata) traditionally eaten in coastal regions. Lab studies show that compounds in dulse — including pigments called phycoerythrins and certain polar...
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Evidence quality
Evidence base hasn't been formally rated yet. See research below.
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Clinical dose
No established dose
What the Science Says
Dulse is an edible red seaweed (Palmaria palmata) traditionally eaten in coastal regions. Lab studies show that compounds in dulse — including pigments called phycoerythrins and certain polar lipids — can neutralize free radicals and reduce inflammatory signals in cell cultures. Some extracts have also slowed cancer cell growth in test tubes, though none of this has been tested in humans.
What It Doesn't Do
No proven anti-inflammatory benefit in humans. No clinical evidence it fights cancer, boosts immunity, or detoxifies the body. 'Superfood' marketing is way ahead of the actual science. No human trials exist to confirm any health benefit.
Evidence-Based Benefits
Dulse pigments and extracts show strong free radical scavenging activity in lab tests.
Weak EvidenceEffective at: No established dose
Supporting studies (click to view on PubMed):
Polar lipids from dulse reduce inflammatory nitric oxide production in immune cells in the lab.
Weak EvidenceEffective at: No established dose
Supporting studies (click to view on PubMed):
Absorption & Bioavailability
Unknown — no human absorption or bioavailability studies were provided
Red Flags to Watch For
- Extremely high potassium content — a case report documented life-threatening hyperkalemia (potassium of 8.6 mmol/L) in a kidney disease patient who ate ~200g of dulse in one day
- People with chronic kidney disease, diabetes, or on potassium-sparing medications should avoid dulse or consult a doctor first
- All antioxidant and anti-inflammatory findings are from cell or lab studies only — no human clinical trials exist in the provided data
- As a seaweed, dulse may accumulate environmental contaminants including heavy metals and radionuclides depending on harvest location
Products Containing Dulse
See how Dulse is used in these analyzed products:
Research Sources
- PubMed
- NIH DSLD
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-05-25