Nori
Overview
Nori is a red seaweed (Porphyra species) commonly used in sushi and Japanese cuisine. It is a primary dietary source of iodine, an essential trace mineral critical for thyroid function and brain development. Nori also provides supporting amounts of folate (B9) and non-heme iron, along with contextual contributions of magnesium, vitamin K, and carotenoids. While nori may contain variable amounts of vitamin B12 depending on species and processing, it should not be relied upon as a sole B12 source. The seaweed polysaccharides and soluble fibre in nori contribute to gut barrier and microbiome modulation through cumulative, supportive effects.
Recipes
Substances
5 substances in this food
Iodine
Thyroid hormone synthesis; neurodevelopment; neurotransmitter regulation
Iron
Oxygen transport; dopamine synthesis (tyrosine hydroxylase cofactor)
Magnesium
Enzymatic cofactor (>300 reactions); neurotransmitters; mitochondria; redox balance
Vitamin B12 (Cobalamin)
Methylation; myelin; mitochondrial odd-chain FA metabolism
Vitamin B9 (Folate; 5-MTHF)
One-carbon metabolism; methylation; homocysteine recycling
Preparation Notes
- Commonly used in sushi rolls and as a garnish
- Part of diverse plant food intake strategy
- Important for iodine intake, especially in plant-based diets
- Folate and iron contributions are context-dependent and work best as part of a varied diet
- Seaweed polysaccharides provide cumulative gut health benefits when consumed regularly
Biological Target Matrix
| Biological Target | Substance | Contribution Level | Therapeutic Areas | Mechanism of Action |
|---|---|---|---|---|
| Hormonal Response | Iodine | Primary contributor | Essential for synthesis of thyroid hormones (T3 and T4), which are crucial for brain development, maturation, and metabolic regulation | |
| Hormonal Response | Magnesium | Contextual / minor contributor | Supports calcium modulation along with vitamin D, taurine, phospholipids, and flavonoids; supports insulin sensitivity, sympathetic arousal, and mitochondrial excitability | |
| Insulin Response | Magnesium | Contextual / minor contributor | Supports insulin sensitivity and glucose metabolism; magnesium deficiency is associated with insulin resistance; supports enzymes involved in glucose metabolism | |
| Methylation | Vitamin B12 (Cobalamin) | Contextual / minor contributor | Essential cofactor in remethylation of homocysteine to methionine, which is converted to S-adenosylmethionine (SAMe); works with B6, B2, and folate; contributes meaningfully to homocysteine reduction, especially in combination with omega-3 fatty acids | |
| Methylation | Vitamin B9 (Folate; 5-MTHF) | Supporting contributor | Essential cofactor in remethylation of homocysteine to methionine, which is converted to S-adenosylmethionine (SAMe); SAMe fuels synthesis of dopamine, norepinephrine, and serotonin and drives phospholipid methylation in neuronal membranes | |
| Mitochondrial Support | Iron | Supporting contributor | Critical for oxygen delivery to the brain via hemoglobin; supports mitochondrial function and energy production | |
| Mitochondrial Support | Magnesium | Contextual / minor contributor | Supports enzymes involved in glycolysis and the Krebs cycle (processes that generate ATP from glucose); binds to ATP and all triphosphates in cells to activate them | |
| Mitochondrial Support | Vitamin B12 (Cobalamin) | Contextual / minor contributor | Crucial role in conversion of methylmalonyl-CoA to succinyl-CoA, a key step in mitochondrial energy production; deficiency leads to buildup of methylmalonic acid and odd-chain fatty acids, which are neurotoxic | |
| Neurochemical Balance | Iodine | Primary contributor | Thyroid hormones regulate synthesis and regulation of key neurotransmitters (dopamine and serotonin), supporting cognitive function and development | |
| Neurochemical Balance | Iron | Supporting contributor | Essential cofactor for tyrosine hydroxylase, the rate-limiting enzyme in the conversion of tyrosine to dopamine; critical for catecholamine synthesis | |
| Neurochemical Balance | Magnesium | Contextual / minor contributor | Broad cofactor for neurotransmitter synthesis and receptor modulation (e.g., NMDA, GABA); functions as an NMDA receptor antagonist and GABA receptor modulator; assists enzymes involved in synthesis of dopamine and serotonin | |
| Neurochemical Balance | Vitamin B12 (Cobalamin) | Contextual / minor contributor | Supports neurotransmitter production through methylation; essential for myelin synthesis | |
| Neurochemical Balance | Vitamin B9 (Folate; 5-MTHF) | Supporting contributor | Supports neurotransmitter synthesis through methylation; cofactor for dopamine synthesis alongside iron, B6, and omega-3s | |
| Stress Response | Magnesium | Contextual / minor contributor | Helps manage stress responses; combined with vitamin D reduced behavioral problems; synergy with zinc and omega-3s reported |
References
- Iodine: Primary dietary source; essential for thyroid function and brain development
- Folate (B9): Supporting contributor for one-carbon metabolism and homocysteine regulation
- Iron (non-heme): Supporting contributor for oxygen delivery; absorption is context-dependent
- Seaweed polysaccharides: Supporting contributor for gut barrier and microbiome modulation (cumulative effects)
- Vitamin B12: Variable and context-dependent; should not be relied upon as sole source
- Magnesium, Vitamin K, Carotenoids: Contextual contributors; modest amounts at typical servings
- Creatine and creatine-pathway amino acids: Presence only (trace); not functionally meaningful at typical intake