S-(hydroxymethyl)glutathione dehydrogenase (NAD+) activity
s-(hydroxymethyl)glutathione dehydrogenase (nad+) activity
S-(hydroxymethyl)glutathione + NAD(+) = S-formylglutathione + NADH + H(+)
s-(hydroxymethyl)glutathione + nad(+) = s-formylglutathione + nadh + h(+)