How can I increase my NAD+ levels?

How can I increase my NAD+ levels?
Fasting or reducing calorie intake, better known as calorie restriction, has been shown to increase NAD+ levels and sirtuin activity. In mice, the increased NAD+ and sirtuin activity from calorie restriction has been shown to slow the aging process. Although NAD+ is present in some foods, the concentrations are too low to affect intracellular concentrations. Taking certain supplements, such as NMN, has been shown to increase NAD+ levels.
CH TRADITIONAL
CH TRADITIONAL