NAD (Nicotinamide Adenine Dinucleotide) is an essential part of every living cell and is involved in many fundamental biological processes. Since NAD levels fall as we age, supplementing with NAD can help support numerous bodily processes including immune health, cognitive function, and overall energy levels.Double Wood Supplements’ NAD+ supplement contains > 95% pure NAD, making it an excellent way to increase NAD+ levels as one ages and natural production declines.