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

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
Metabolic & Neuroendocrine Stress (HPA Axis & ANS)	Magnesium	Contextual / minor contributor	ADHD, Anxiety & GAD, Depression & MDD, Postnatal Depression (PND / PPD) — Evidence Base	Helps manage stress responses; combined with vitamin D reduced behavioral problems; synergy with zinc and omega-3s reported
Methylation & One-Carbon Metabolism	Vitamin B12 (Cobalamin)	Contextual / minor contributor	ADHD, Anxiety & GAD, Depression & MDD, Postnatal Depression (PND / PPD) — Evidence Base, Alzheimer's Disease	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 & One-Carbon Metabolism	Vitamin B9 (Folate; 5-MTHF)	Supporting contributor	ADHD, Anxiety & GAD, Depression & MDD, Postnatal Depression (PND / PPD) — Evidence Base, Alzheimer's Disease	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 Function & Bioenergetics	Iron	Supporting contributor	ADHD, Anxiety & GAD, Depression & MDD, Postnatal Depression (PND / PPD) — Evidence Base, Alzheimer's Disease, Bipolar Disorder	Critical for oxygen delivery to the brain via hemoglobin; supports mitochondrial function and energy production
Mitochondrial Function & Bioenergetics	Magnesium	Contextual / minor contributor	ADHD, Anxiety & GAD, Depression & MDD, Postnatal Depression (PND / PPD) — Evidence Base, Alzheimer's Disease, Bipolar Disorder	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 Function & Bioenergetics	Vitamin B12 (Cobalamin)	Contextual / minor contributor	ADHD, Anxiety & GAD, Depression & MDD, Postnatal Depression (PND / PPD) — Evidence Base, Alzheimer's Disease, Bipolar Disorder	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
Neurotransmitter Regulation	Iodine	Primary contributor	ADHD, Anxiety & GAD, Depression & MDD, Postnatal Depression (PND / PPD) — Evidence Base, Alzheimer's Disease, Bipolar Disorder	Thyroid hormones regulate synthesis and regulation of key neurotransmitters (dopamine and serotonin), supporting cognitive function and development
Neurotransmitter Regulation	Iron	Supporting contributor	ADHD, Anxiety & GAD, Depression & MDD, Postnatal Depression (PND / PPD) — Evidence Base, Alzheimer's Disease, Bipolar Disorder	Essential cofactor for tyrosine hydroxylase, the rate-limiting enzyme in the conversion of tyrosine to dopamine; critical for catecholamine synthesis
Neurotransmitter Regulation	Magnesium	Contextual / minor contributor	ADHD, Anxiety & GAD, Depression & MDD, Postnatal Depression (PND / PPD) — Evidence Base, Alzheimer's Disease, Bipolar Disorder	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
Neurotransmitter Regulation	Vitamin B12 (Cobalamin)	Contextual / minor contributor	ADHD, Anxiety & GAD, Depression & MDD, Postnatal Depression (PND / PPD) — Evidence Base, Alzheimer's Disease, Bipolar Disorder	Supports neurotransmitter production through methylation; essential for myelin synthesis
Neurotransmitter Regulation	Vitamin B9 (Folate; 5-MTHF)	Supporting contributor	ADHD, Anxiety & GAD, Depression & MDD, Postnatal Depression (PND / PPD) — Evidence Base, Alzheimer's Disease, Bipolar Disorder	Supports neurotransmitter synthesis through methylation; cofactor for dopamine synthesis alongside iron, B6, and omega-3s

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

Overview​

Recipes​

Substances​

Iodine

Iron

Magnesium

Vitamin B12 (Cobalamin)

Vitamin B9 (Folate; 5-MTHF)

Preparation Notes​

Biological Target Matrix​

References​