methylenetetrahydrofolate reductase (NADPH) activity
methylenetetrahydrofolate reductase (nadph) activity
Catalysis of the reaction: (6S)-5-methyl-5,6,7,8-tetrahydrofolate + NADP+ = (6R)-5,10-methylene-5,6,7,8-tetrahydrofolate + NADPH + H+.