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Modern Nutrition in Health and Disease (978-1-60547-461-8)I had something to say but forgot what it was((
"The interconversion and metabolism of vitamin B6 depend on riboflavin, niacin, and zinc (see Fig. 24.2). Both PN [pyridoxine] (PM [pyridoxamine]) phosphate oxidase and aldehyde oxidase require riboflavin in the forms of FMN and FAD, respectively. Niacin, as NAD, serves as coenzyme for aldehyde dehydrogenase. The phosphorylation of vitamin B6 is catalyzed by PL [pyridoxal] kinase, which requires zinc as cofactor. Insufficient dietary intake of these nutrients may adversely affect the metabolic utilization of vitamin B6."