Function

Nicotinamide riboside (NR) is a pyridine-nucleoside form of vitamin B3 that functions as a precursor to nicotinamide adenine dinucleotide or NAD+. NR has been a recent focus of life extension research after David Sinclair published a study in 2013 showing NAD+ levels decrease with age in mice.

Nicotinamide Riboside is a natural ingredient that is found in milk. It is actually related to niacin and other forms of vitamin B3. 
This molecule has become more and more popular today because of various scientific studies that prove its ability to prevent obesity by helping you fight weight gain. Researchers have found that this molecule can serve as a unique supplement that will boost one's metabolism to help burn off more calories and prevent weight gain. 
Apart from preventing weight gain, it also helps boost muscle performance, increase energy expenditure, and minimize the risk factors of diabetes.