Dulse
Also known as: Palmaria palmata, red dulse, sea lettuce flakes, dillisk
Effective Dosage
No established dose from provided studies
What the Science Says
Dulse is an edible red seaweed (Palmaria palmata) harvested from cold Atlantic and Pacific waters. 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 cell-based studies also found dulse extracts slowed the growth of cancer cells in a dish, though this has never been tested in humans.
What It Doesn't Do
No human clinical trials exist for any health claim. Not proven to reduce inflammation in people. Not proven to fight cancer in humans — cell dish results don't translate to real-world outcomes. No evidence it detoxifies the body, boosts immunity, or improves any measurable health marker in living people.
Evidence-Based Benefits
Dulse is an edible red seaweed (Palmaria palmata) harvested from cold Atlantic and Pacific waters. 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 cell-based studies also found dulse extracts slowed the growth of cancer cells in a dish, though this has never been tested in humans.
Weak EvidenceEffective at: No established dose from provided studies
Source: auto-research
Absorption & Bioavailability
Unknown — no human absorption or bioavailability studies were provided. Active compounds identified in lab extracts may behave very differently when consumed as food or supplement.
Red Flags to Watch For
- Extremely high potassium content — a documented case report shows 200g of dulse caused life-threatening hyperkalemia (potassium level of 8.6 mmol/L) in a patient with kidney disease, leading to cardiac arrest episodes
- Anyone with chronic kidney disease, diabetes-related kidney damage, or taking medications that affect potassium levels should avoid dulse or consult a doctor first
- Zero human clinical trials support any of the health benefits commonly marketed for this ingredient
- Seaweed can accumulate heavy metals and radioactive iodine from ocean water — product quality and sourcing matter significantly
- 503 registered supplement products on NIH DSLD suggests heavy commercial use far outpacing the actual evidence base
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: 2026-04-09