The forms of the electron carriers nad+/nadh and fadh/fadh2 have high potential energy.

The reduced forms of the electron carriers NAD⁺/NADH and FADH/FADH₂ have high potential energy.
NAD is coenzyme called nicotinamide adenine dinucleotide.
FADH is redox cofactor called flavin adenine dinucleotide.
Reduced forms of NAD and FAD are reducing agents and they donate electrons in living cells.

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