Vitamin B6: Clinical Evidence & Substantiation Summary

Clinical Trials
56
Strongest Evidence
Mood & Neurotransmitter Support
Typical Dosage
10–100 mg/day
Common Forms
Pyridoxine HCl

What Is Vitamin B6?

Vitamin B6 (pyridoxine) is a water-soluble vitamin involved in over 100 enzymatic reactions, primarily in amino acid metabolism, neurotransmitter synthesis, and immune function. Pyridoxal 5'-phosphate (P5P) is the active coenzyme form.

Mechanism of action: P5P serves as a cofactor for aminotransferases, decarboxylases, and other enzymes in amino acid metabolism. It is essential for synthesis of serotonin, dopamine, GABA, and norepinephrine. B6 also modulates steroid hormone receptor expression and is required for hemoglobin synthesis.

Clinical Evidence Summary

Below are 5 key clinical studies on Vitamin B6. Nutra Comp analyses 56+ studies in its full clinical evidence report.

Meta-analysis2021PMID: 33865176

Vitamin B6 and depression: meta-analysis

Population: 14 studies

Key finding: Higher B6 intake was inversely associated with depression risk. Supplementation as adjunct therapy showed modest benefits (p=0.04).

Systematic review2018PMID: 29473879

B6 supplementation and PMS symptoms

Population: 9 RCTs

Key finding: B6 (50–100 mg/day) significantly reduced PMS symptoms including mood changes, irritability, and bloating (p<0.01).

Meta-analysis2018PMID: 30466985

Vitamin B6 and homocysteine

Population: 12 RCTs

Key finding: B6 supplementation reduced homocysteine levels, with greater effect when combined with folate and B12.

Systematic review2019PMID: 31691193

B6 and immune cell function

Population: 8 studies

Key finding: B6 deficiency impaired lymphocyte proliferation and IL-2 production. Supplementation restored immune parameters in deficient populations.

RCT crossover2020PMID: 32432219

P5P vs pyridoxine: bioavailability comparison

Population: 36 healthy adults

Key finding: P5P and pyridoxine HCl showed similar overall bioavailability, but P5P provided higher plasma P5P levels in individuals with liver dysfunction.

Evidence-Based Structure–Function Claims

Sample FDA-compliant structure–function claims generated by Nutra Comp, each linked to clinical evidence and scored for confidence.

8
Supports healthy neurotransmitter synthesis and mood
Category: Mood · Confidence: 8/10
7
Supports healthy immune system function
Category: Immune · Confidence: 7/10
8
Supports healthy homocysteine metabolism
Category: Cardiovascular · Confidence: 8/10

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Related Ingredients

Magnesium
89 studies · Sleep & Relaxation
Vitamin B12
89 studies · Nervous System Support
Folate (Vitamin B9)
94 studies · Prenatal Health

Key Terms

BioavailabilityDaily Value (DV)Clinically Effective Dose

Frequently Asked Questions

Is vitamin B6 FDA approved?

B6 is an essential vitamin sold as a dietary supplement. The Daily Value is 1.7 mg. It does not require FDA drug approval.

What are the most studied benefits?

Neurotransmitter support, PMS symptom relief, immune function, and homocysteine metabolism. Benefits are strongest in deficient populations.

What dosage is used?

10–100 mg/day depending on the indication. Long-term intake above 100 mg/day of pyridoxine carries risk of peripheral neuropathy. P5P may be preferred for those with liver concerns.

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