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NADPH is the reduced form of nicotinamide adenine dinucleotide phosphate. It carries Electrons used in synthesis; in the Calvin cycle it becomes the oxidized form NADP+, available for reuse by light-dependent reactions. NADPH and ATP serve different roles even though both connect light capture to carbon fixation.

NADP+ is the oxidized form of nicotinamide adenine dinucleotide phosphate. It can accept Electrons to form NADPH; the light-dependent reactions supply this conversion during oxygenic photosynthesis.

Nicotinamide adenine dinucleotide phosphate is a cofactor used in metabolism. Its oxidized and reduced forms, NADP+ and NADPH, carry Electrons between coupled chemical reactions. In oxygenic photosynthesis, light-dependent reactions produce NADPH for the Calvin cycle, which returns NADP+ for reuse. ^[ref].