Algae & Seaweed · Other

Sea Lettuce

Provisional Moderate ScoreCompound

Hermetica Superfood Encyclopedia

Published March 15, 2026Last updated March 15, 2026Methodology · Editorial policy · Report an error

Evidence review status: unreviewed

Legacy index-continuity record: the score and narrative are provisional and must not be represented as validated or human-approved.

Review flags: AWAITING_SEMANTIC_VALIDATION

Provisional Summary

Sea lettuce (Ulva lactuca) contains electrophilic compounds with α,β-unsaturated carbonyl moieties that activate the Nrf2 antioxidant pathway by disrupting Keap1-Nrf2 complexes. These Michael acceptors promote nuclear translocation of Nrf2, inducing phase II detoxification enzymes and reducing inflammatory markers in macrophage studies.

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Screened PMID Records

Reported Benefits

Pending

Synergy Review

At a Glance

CategoryAlgae & Seaweed

GroupOther

Public Score StatusProvisional Moderate

Primary Keywordwhat is Sea Lettuce

Sea Lettuce — botanical close-up

Reported Benefits (Provisional)

Supports thyroid health,

bone strength, and energy production due to its rich content of iodine, calcium, magnesium, and iron.

Neutralizes free radicals

and promotes cellular health through its antioxidant profile, including vitamin C, beta-carotene, and polyphenols.

Provides high-quality, plant-based

protein, making it a valuable nutrient source for various diets.

Aids digestion and

supports gut microbiome balance with its high soluble fiber content.

Reduces inflammation and

supports overall wellness via bioactive compounds like sulfated polysaccharides.

Origin & History

Natural habitat

Ulva lactuca, commonly known as Sea Lettuce, is a bright green, leafy alga found in shallow, nutrient-rich coastal waters worldwide. Valued for its delicate texture, unique umami flavor, and exceptional nutritional profile, it has been a popular choice in coastal cuisines for centuries. This versatile sea vegetable offers significant functional health benefits.

“Sea Lettuce has been a staple in traditional diets and remedies for centuries across coastal communities worldwide, including Japan and Ireland. It was historically valued for its umami flavor and its ability to provide essential nutrients, particularly in times of scarcity, and was used for its digestive and overall health benefits.”Traditional Medicine

Research Narrative (Provisional)

Scientific research on Sea Lettuce (Ulva lactuca) highlights its rich nutritional profile, including protein, minerals, and bioactive polysaccharides. Studies, including in vitro and animal models, investigate its antioxidant, anti-inflammatory, and prebiotic properties, supporting its traditional uses for digestive and overall health. Further human clinical trials are emerging to validate specific functional claims.

Preparation & Dosage

Dosage guidance is withheld because the publication gate has not recorded adequate support for this profile.

Nutritional Profile

- Macronutrients: Protein, Soluble fiber. - Minerals: Iodine, Iron, Calcium, Magnesium. - Vitamins: C, Beta-carotene (precursor to Vitamin A). - Bioactives: Omega-3 fatty acids, Sulfated polysaccharides, Polyphenols.

Reported Mechanism (Provisional)

Mechanism of Action

Sea lettuce's electrophilic compounds act as Michael acceptors, alkylating Keap1 protein to disrupt Keap1-Nrf2 complexes and promote Nrf2 nuclear translocation. This activation triggers transcription of antioxidant response element (ARE)-driven genes including Nqo1 and hPAP, while reducing iNOS/Cox2 expression. The mechanism is supported by polysaccharides, phenolics, and vitamins C and E that provide additional anti-peroxidation effects.

Clinical Narrative (Provisional)

Human clinical trials for sea lettuce are lacking, with evidence limited to preclinical studies. Mouse studies (n=3) demonstrated that oral gavage at 140 mg/kg increased hPAP activity 3.2-fold in liver and 3.9-fold in lung tissue within 12 hours, confirming bioavailability and ARE activation. In vitro studies using RAW264.7 macrophages showed attenuated LPS-induced nitric oxide and PGE2 production, though effects were abrogated in Nrf2-knockout cells. The evidence base requires human trials to validate therapeutic efficacy and establish clinical dosing parameters.

Also Known As

Ulva lactucaGreen LaverUlva speciesMarine lettuce

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These statements have not been evaluated by the Food and Drug Administration. This content is for informational purposes only and is not intended to diagnose, treat, cure, or prevent any disease.

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