Reaction catalyzed by NAD(P)H dehydrogenase (quinone) (1.6.5.2)

		+		NAD(P)H	=			+		NAD(P)+
	2-methyl-1,4-naphthoquinone	+		NAD(P)H	=		2-methyl-1,4-dihydronaphthoquinone	+		NAD(P)+