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WHAT DO YOU MEAN BY NADH?
Nicotinamide adenine dinucleotide (NAD+) and nicotinamide adenine dinucleotide phosphate (NADP+) are organic compounds that play important roles in metabolic biochemistry. The reduced forms of these molecules are NADH and NADPH.

NADH and NADPH act as electron carriers. When NAD+ and NADP+ accept a hydride ion (H-), they are accepting two electrons and a proton. They can later donate the hydride ion to other molecules, releasing energy in the process. NADH and NADPH are reduced forms of NAD+ and NADP+, meaning that they have been "reduced" by gaining electrons. NADH participates in catabolic reactions, reactions that break down molecules to release energy, NADH is best known for its role in cellular respiration.


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