The full form of NADPH is:

The correct full form of NADPH is Nicotinamide Adenine Dinucleotide Phosphate (Hydrogen).

NADPH is a crucial coenzyme that plays a key role in various biochemical processes, particularly in photosynthesis and cellular metabolism. It is a reduced form of NADP⁺ (Nicotinamide Adenine Dinucleotide Phosphate), carrying an additional hydrogen ion (H⁺). This hydrogen ion enables NADPH to act as an electron donor in numerous anabolic reactions, such as fatty acid synthesis and the Calvin cycle in plants.

In photosynthesis, NADPH is produced in the light-dependent reactions and serves as an energy carrier that helps convert carbon dioxide into glucose during the light-independent reactions. Its ability to transfer electrons and provide reducing power is vital for maintaining the balance of energy and molecules in living organisms.