nicotinamide riboside nr molecule. precursor of nicotinamide adenine dinucleotide nad. 3d rendering. atoms are represented as

nicotinamide riboside nr molecule precursor adenine dinucleotide nad 3d rendering atoms are represented as mononucleotide vitamin b3 niacin pellagra ageing antiaging mitochondria energy nicotinamid life extension cow milk dyslipidemia cholesterol sirtuin atomic model molecular compound composition chemical chemistry science scientific spheres conventional color coding hydrogen white carbon grey oxygen red nitrogen blue