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In additional, certain bacterial taxa in the intestine can also produce enzymes that catalyze the synthesis of neurotransmitters in the brain

"Ligand-dependent interaction of estrogen receptor-alpha with members of the forkhead transcription factor family"

The three B vitamins support those with B deficiency because B vitamins work together as well as having their own unique jobs
Some nootropics can also affect psychiatric problems

Fetissov SO, Averina OV, Danilenko VN (2019) Neuropeptides in the microbiota-brain axis and feeding behavior in autism spectrum disorder
