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A meta-analysis"
P5P also acts a coenzyme in the synthesis of dopamine, norepinephrine, and GABA.14 Having adequate levels of vitamin B6 supports serotonin synthesis and melatonin production, as it is a precursor.* Gammaaminobutyric acid (as PharmaGABA) is a naturally occurring amino acid in the brain and a major inhibitory neurotransmitter in the central nervous system
No human pharmacokinetic study has settled this
*Daily Value (DV) not established
PMID: 84 ZhangL
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