NAD+ (Nicotinamide adenine dinucleotide) is a vital coenzyme found in all living cells that plays a crucial role in various metabolic processes, including energy production, DNA repair, and cellular signaling. It acts as a helper molecule for enzymes involved in these processes, particularly those related to cellular respiration. NAD+ levels decline with age, and this decline is linked to age-related diseases and a general decrease in cellular function. 2 caps 1-2 times daily.