Nori
Pyropia / Porphyra spp.
Sea Moss & Algae. Modern nutrition.
Also called Laver, Zi cai, Sushi seaweed
Pinyin: Zǐ Cài
Spanish: Alga nori
A thin, dried seaweed sheet used to wrap sushi, rich in minerals and low in calories.
Did you know? Some people in Japan carry gut bacteria that can digest porphyran, a sugar found in nori that many people elsewhere cannot break down.
What it may help, and how strong the proof is
- Thyroid. Contains iodine, which the thyroid needs. The amount is moderate and varies by brand, so it is not a proven treatment for thyroid disease.Traditional proof
- Anemia & blood building. Sold as a vitamin B12 source. Most of the B12 in nori is the inactive kind, so it is not a reliable source.Not supported
Parts of the body
Traditional use
Nori has been eaten in Japan and China for centuries and is now a common sushi wrap. Its medicinal uses are mostly folk and food-based.
How it is classified
- Herbal actions
- Nutritive, Antioxidant. Energy: neutral.
How people take it
Eaten as a sushi wrap, a crisp snack sheet, or flakes sprinkled on food.
Food.
Where to get it
Farmed in coastal waters in Japan, Korea and China, often grown on nets. Sold as dried sheets, flakes and snack packs.
Be careful
Safe as food for most people. Iodine is moderate, but people with thyroid disease should still watch their intake. Some seaweeds carry heavy metals, so choose tested brands.
Avoid if: thyroid disease.
Mixing with other things
- Worth knowingThyroid medicine (levothyroxine (Synthroid))
Iodine in nori can matter for people on thyroid medicine.
Adds up with others that carry iodine: , , , , , .
The honest take
Nori is a healthy, low-calorie food, but it is not a reliable vitamin B12 source. Its iodine level is moderate and varies by brand. Claims that nori treats thyroid disease or detoxes the body are not supported.