What is the difference between NR, NMN and NADH?Updated 3 months ago

All three molecules are essential for cellular health and are closely related to NAD+.

• NR (Nicotinamide Riboside) and NMN (Nicotinamide Mononucleotide) are both precursors (forerunners). This means that they are ingested to be converted into NAD+ in the cell, with the aim of restoring declining NAD+ levels (often due to ageing). 
• NADH (Nicotinamide Adenine Dinucleotide + Hydrogen) is the active, energy-carrying form of NAD+. After NAD+ has captured electrons and a hydrogen atom in the mitochondria, it becomes NADH. NADH then donates these electrons to fuel the production of ATP (cellular energy).

In short: NR and NMN are building blocks for increasing the supply of essential NAD+. NADH is the energy-rich form that is created in the cell and plays a direct role in the cell's energy factory.