During the Citric Acid Cycle, NADH and are formed as high-energy electron carriers that help in the production of ATP through the electron transport chain. In one specific step of the Citric Acid Cycle, GTP (or ATP, depending on the organism) is directly synthesized during the conversion of succinyl-CoA to succinate.Thus, GTP (E) is directly involved in the formation of ATP. Citric acid , although it initiates the cycle, and , a byproduct of decarboxylation reactions within the cycle, do not directly contribute to the formation of ATP or act as energy carriers themselves.