DL-Mevalonolactone-d3 is the deuterium labeled DL-Mevalonolactone[1]. DL-Mevalonolactone ((±) -Mevalonolactone; Mevalolactone) is the δ-lactone form of mevalonic acid, a precursor in the mevalonate pathway. DL-Mevalonolactone (Mevalonolactone) decreases mitochondrial membrane potential (Ψm), NAD (P) H content and the capacity to retain Ca2+ in the brain, besides inducing mitochondrial swelling[2][3].