What Is the Difference Between NADP and NADPH?

NADPH is the reduced form of NADP+, meaning that the latter features an extra hydrogen ion in its chemical structure. In order for NADP+ to transform into NADPH, the former requires two electrons and two hydrogen ions. One of the hydrogen ions is included in the structure of NADPH, while the other is released as a product of reaction. This reaction is part of the photosynthesis process.