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B-group vitamin deficiencies increase neuronal excitability and interfere with sleep

The review states that B-group vitamins (B6, B12, folate) are cofactors in serotonin and GABA synthesis, and their deficiency increases neuronal excitability and disrupts sleep. No specific effect sizes or quantitative data are provided.

Last updated: Jul 7, 2026•0 RCTs•📖 Read as article →

Evidence Score

Evidence Score32/100
Human RCT☆☆☆☆☆
Meta-analysis☆☆☆☆☆
Mechanism★★★★★
Safety★★★★☆
Confidencelow

Study Evidence

Study 1. Nutritional modulators of sleep: A narrative review of vitamins, minerals, amino acids, and their neurobiological and chronoepigenetic mechanisms.

observational

Khosropanah A, Hosseini SA, Keshavarz A · Chronobiology international (2026)

Participants: N/A
Duration: N/A
Intervention: B-group vitamins (B6, B12, folate) deficiency or supplementation
Outcome: Neuronal excitability, sleep quality (interference with sleep)
Effect Size: N/A
Population: General population (narrative review of existing evidence)

Result:

PubMed: 41992896DOI: 10.1080/07420528.2026.2648011

Mechanism Graph

B-group vitamins act as cofactors in serotonin and GABA synthesis
↓
Deficiency reduces serotonin and GABA production
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Reduced inhibitory neurotransmission increases neuronal excitability
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Result: sleep disruption

Limitations

  • ⚠Narrative review design without systematic quantitative synthesis
  • ⚠No specific effect sizes or controlled trial data reported for this claim
  • ⚠Potential confounding from other nutritional factors not isolated

Frequently Asked Questions

Which B vitamins are most important for sleep?▼

The review highlights B6, B12, and folate as key cofactors for serotonin and GABA synthesis, which are critical for sleep regulation.

Can B vitamin supplements improve sleep?▼

The review suggests that correcting deficiencies may improve sleep, but does not provide evidence that supplementation in non-deficient individuals is beneficial.

How do B vitamins affect neuronal excitability?▼

B vitamins are cofactors for enzymes that synthesize serotonin and GABA, which are inhibitory neurotransmitters. Deficiency reduces these neurotransmitters, leading to increased neuronal excitability and sleep disruption.

Is this claim based on human studies?▼

The abstract does not specify study types for this claim; it is a narrative review synthesizing evidence, which may include animal and human studies.

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References

  1. 1.Khosropanah A, Hosseini SA, Keshavarz A. "Nutritional modulators of sleep: A narrative review of vitamins, minerals, amino acids, and their neurobiological and chronoepigenetic mechanisms.." Chronobiology international, 2026. PMID: 41992896 DOI: 10.1080/07420528.2026.2648011
Disclaimer: This content is for educational purposes only and is not medical advice. Evidence scores reflect the quality and quantity of available research, not clinical recommendations. Always consult a healthcare professional before starting any supplement or intervention.