Key points from article :
Nicotinamide riboside (NR) is a form of Vitamin B3.
University of Iowa researchers have shown that the compound is safe for humans.
It increases levels of NAD+ that is critical for cellular energy production and protection against stress and DNA damage.
Levels of NAD+ diminish with age.
Previous mice studies have also shown it increases lifespan.
The study was published in the Nature Communications journal.