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462 Thus, integrating regular moderate exercise into lifestyle practices is a scientifically supported strategy for optimizing immune health

The biologically active form of vitamin B6, pyridoxal 5-phosphate (P5P), is used as a cofactor in hundreds of different cellular reactions.[ref] Let me hit the highlights here: Nervous system and neurotransmitters : P5P is essential in the process of synthesizing serotonin from the amino acid tryptophan

Yes, actually - they're made to work as a set