Nicotinamide riboside (NR) is a pyridine nucleoside, part of the vitamin B3 family, functioning as a precursor to nicotinamide adenine dinucleotide or NAD+. UltraHealths NAD+ Supplement uses the highest purity Nicotinamide Riboside, NR NRCL, to provide the highest available adsorption into the bodys cells. Only UltraHealths test results are posted in the pictures on the product page. Also, the manufacturing date and expiration date is posted. No other company in all of the dietary supplement category does this