Nicotinamide adenine dinucleotide (NAD⁺) is found in every living cell, serving as an essential cofactor — the compounds necessary for the activity of molecular machines (enzymes) — involved in fundamental biological processes. Initially discovered in 1906, NAD⁺ has seen a resurgence in research continually showing that NAD⁺ is critical for maintaining the health of our cells, tissues, and bodies. The problem is that as we age, we see a gradual decline in cellular NAD⁺ levels. This decline in NAD⁺ is linked to numerous age-associated diseases, including cognitive decline, cancer, metabolic disease, sarcopenia (age-related loss of muscle mass and strength), and frailty. Many of these diseases can be slowed down or even reversed by restoring NAD⁺ levels. So, what exactly is NAD⁺, how is it made, and how is it used by our cells? Answering these questions will help us understand the roles of NAD⁺ in maintaining healthy aging and whether and how NAD⁺ deficiencies can be treated. Where is NAD⁺ Found in the Cell? NAD⁺ is compartmentalized into different structures within each cell. It’s found in the gelatinous liquid that fills the cell (cytoplasm), the cell’s battery packs (mitochondria), and where the cell houses genetic information (nucleus). These subcellular pools of NAD⁺ are regulated independently of each other, and consistent with this, the enzymes involved in the biosynthesis or degradation of NAD⁺ are highly compartmentalized as well. How do Cells Make NAD⁺? NAD⁺ mediates multiple major biological processes and is always in high demand. NAD⁺ is constantly synthesized, metabolized, and recycled in the cell to maintain stable intracellular NAD⁺ levels. Some cells, mostly in the liver, can synthesize NAD⁺ from scratch (de novo) using multiple dietary sources. NAD⁺ can be made de novo from L-tryptophan or vitamin precursors, such as nicotinic acid (NA). Outside the liver, most cells do not express the full array of enzymes necessary to convert tryptophan to NAD⁺. But it can also be recycled or salvaged from nicotinamide (NAM), a by-product of when enzymes use NAD⁺ as a cofactor. Most tryptophan is metabolized to NAM in the liver, where it is released into the serum, taken up by peripheral cells, and eventually converted to NAD⁺. In this pathway, NAM is converted to nicotinamide mononucleotide (NMN) by an enzyme called NAMPT, which can be converted to NAD⁺. NMN also forms from nicotinamide riboside (NR).
Ultima-NAD+ 500Mg USA by Ultima Pharmaceuticals USA domestic.
