label: methylenetetrahydrofolate reductase (NADH) activity
label_lc: methylenetetrahydrofolate reductase (nadh) activity
description: "Catalysis of the reaction: (6S)-5-methyl-5,6,7,8-tetrahydrofolate + NAD+ = (6R)-5,10-methylene-5,6,7,8-tetrahydrofolate + NADH + H+."