In enzymology, a lactaldehyde reductase (EC1.1.1.77) is an enzyme that catalyzes the chemical reaction

The 3 substrates of this enzyme are (R)-propane-1,2-diol, (S)-propane-1,2-diol, and NAD, whereas its 4 products are (R)-lactaldehyde, (S)-lactaldehyde, NADH, and H.