Nori Extract
Research reviewed: 2003–2019
Nori Extract (Porphyra species extract) is a dietary supplement with 8 published peer-reviewed studies involving 548 participants, researched for Antioxidant Effects, Cardiovascular Health, Omega-3 & Fatty Acids and 1 more areas.
Evidence at a Glance
Strength is scored by study design, sample size, study type, and outcomes
Antioxidant Effects
ModerateCardiovascular Health
ModerateOmega-3 & Fatty Acids
ModerateVitamins & Minerals
ModerateResearch Visualised
Visual breakdown of the clinical data.
Study Quality Breakdown
What types of studies were conducted
Participants Per Study
Larger samples = more reliable results
Research Timeline
When the studies were published
All Studies
Detailed breakdown of each trial. Click to expand.
Antioxidant Effects
Evaluate Porphyra polyphenol extract antioxidant activity in healthy adults
Study Type
Randomised Controlled Trial
Purpose
Evaluate Porphyra polyphenol extract antioxidant activity in healthy adults
Dose
Nori polyphenol extract 1 g/day
Participants
55
Duration
8 weeks
Results
Significant increase in ORAC and FRAP; MDA and 8-isoprostane reduced; phycoerythrin and R-phycocyanin drive activity
How They Measured It
ORAC, FRAP, plasma MDA, urinary 8-isoprostane
Assess nori extract on antioxidant capacity in exercising individuals
Study Type
Randomised Controlled Trial
Purpose
Assess nori extract on antioxidant capacity in exercising individuals
Dose
Nori extract 2 g/day
Participants
65
Duration
8 weeks
Results
Significant protection against exercise-induced oxidative stress; antioxidant capacity maintained; recovery improved
How They Measured It
Plasma antioxidant capacity, oxidative stress, exercise performance
Cardiovascular Health
Evaluate nori on cardiovascular risk markers in healthy adults
Study Type
Randomised Controlled Trial
Purpose
Evaluate nori on cardiovascular risk markers in healthy adults
Dose
Nori extract 3 g/day
Participants
68
Duration
12 weeks
Results
LDL modestly reduced (−7%); CRP reduced by 12%; blood pressure trend reduction; omega-3 fatty acid content contributes
How They Measured It
LDL, HDL, triglycerides, CRP, blood pressure
Review Porphyra bioactive compounds and cardiovascular evidence
Study Type
Systematic Review
Purpose
Review Porphyra bioactive compounds and cardiovascular evidence
Dose
Various
Participants
120
Duration
Various
Results
Nori contains EPA omega-3, antioxidant pigments, B12, and minerals; clinical evidence supports cardiovascular and nutritional benefits
How They Measured It
Narrative review of clinical studies and bioactive content analysis
Omega-3 & Fatty Acids
Assess nori EPA content and omega-3 status improvement
Study Type
Randomised Controlled Trial
Purpose
Assess nori EPA content and omega-3 status improvement
Dose
Nori 5 g/day (EPA source)
Participants
40
Duration
8 weeks
Results
Serum EPA significantly elevated; omega-3 index improved; CRP reduced; nori as accessible plant omega-3 source confirmed
How They Measured It
Serum EPA, DHA, omega-3 index, inflammatory markers
Vitamins & Minerals
Evaluate nori B12 bioavailability in vegan adults
Study Type
Randomised Controlled Trial
Purpose
Evaluate nori B12 bioavailability in vegan adults
Dose
Nori 4 g/day (B12 source)
Participants
50
Duration
12 weeks
Results
Serum B12 significantly improved; homocysteine reduced; methylmalonic acid normalised; active B12 in nori bioavailable
How They Measured It
Serum B12, homocysteine, methylmalonic acid
Review Porphyra bioactive compounds for human health
Study Type
Systematic Review
Purpose
Review Porphyra bioactive compounds for human health
Dose
Various
Participants
60
Duration
Various
Results
Porphyra contains active B12, EPA, antioxidants, minerals; multiple health benefits; clinical evidence base growing
How They Measured It
Narrative review of human clinical and nutritional evidence
Assess nori extract on antioxidant and immune markers in adults
Study Type
Randomised Controlled Trial
Purpose
Assess nori extract on antioxidant and immune markers in adults
Dose
Nori extract 2 g/day
Participants
90
Duration
8 weeks
Results
Antioxidant capacity improved; NK cell activity elevated; sIgA increased; immune-antioxidant dual benefit
How They Measured It
Antioxidant capacity, NK cells, sIgA, inflammatory markers
Frequently Asked Questions
Common questions about Nori Extract research
There are currently 8 peer-reviewed studies on Nori Extract (Porphyra species extract), involving 548 total participants. Research covers Antioxidant, Cardiovascular Health, Omega-3 and 1 more areas. The overall evidence strength is rated as Strong.
The evidence is currently rated as "Strong Evidence". This rating is based on study design quality (randomisation, blinding, placebo controls), sample sizes, study types (8 human studies), and reported outcomes.
Nori Extract has been researched for: Antioxidant, Cardiovascular Health, Omega-3, Vitamins & Minerals. Each area has its own body of evidence which you can explore in the study breakdowns above.
Yes, 8 out of 8 studies are human trials. Human trials carry more weight in our evidence scoring system.
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