Lactic acid-d4 (DL-Lactic acid-d4) sodium (60% in water) is the deuterium labeled Lactic acid sodium (60% in water) (HY-B2227B) . Lactic acid (DL-Lactic acid) sodium (60% w/w in water) is a hydroxycarboxylic acid receptor 1 (HCAR1) activator and an epigenetic modulator inducing lysine residues lactylation. Lactic acid sodium (60% w/w in water) is a glycolysis end-product, bridging the gap between glycolysis and oxidative phosphorylation. Lactic acid sodium (60% w/w in water) is an oncometabolite and has immune protective role of lactate in anti-tumor immunity[1][2]. Lactic acid sodium (60% w/w in water) also has antimicrobial activity, which can be used as a food preservative[3].