Nori

Studies in people

• Benefit

  Vitamin B12 levels in vegetarians⁴

  Eating 5 g of nori daily for 4 weeks improved vitamin B12 levels in vegetarians, with no extra benefit from 8 g.

• Benefit

  Blood pressure in children⁵

  In boys aged 4 to 5, eating nori daily for 10 weeks lowered diastolic blood pressure.

Study type not stated

• Benefit

  Vitamin B12 and blood health⁶

  Nori is a source of vitamin B12, which the body needs to make red blood cells and keep nerves working.

• Benefit

  Vitamin B12 and iron in vegetarian diets⁷

  Dried nori contains vitamin B12 and iron, which vegetarian diets often lack.

Found in some samples or products

These come from where it was grown, how it was processed or cooked, or what it was made into. They are not about the ingredient itself, so the signal does not count them.

• Food poisoning from dried seaweed³

  In Japan, nori was tied to seven outbreaks that sickened 2,094 people.

The signal at the top counts the findings in people and in animal and lab studies. A concern in studies of people outranks animal and lab studies, and “No concerns” needs at least one finding in people. When most findings in people point one way, the page leans that way (“Mostly”), and every finding is still shown. Findings whose study type is not stated are shown but not counted. This page is a reference, not medical advice. It describes what regulators and published research say. Talk to a doctor or dietitian about your own diet.