Adenosine 5′-diphosphoribose sodium (ADP ribose sodium) is a nicotinamide adenine nucleotide (NAD + ) metabolite. Adenosine 5′-diphosphoribose sodium is the most potent and primary intracellular Ca 2+ -permeable cation TRPM2 channel activator. Adenosine 5′-diphosphoribose sodium also can enhance autophagy .