"The main conclusion is that zinc repletion per se caused activation of niacin metabolism, increasing the excretion of niacin metabolites. This emphasizes the role of zinc in the function of these vitamins."
More at link:
Interaction among niacin, vitamin B6 and zinc in rats receiving ethanol. - PubMed - NCBI
More at link:
Interaction among niacin, vitamin B6 and zinc in rats receiving ethanol. - PubMed - NCBI