How many molecules of adenosine triphosphate and NADPH are used in the reduction stage?

1. The reduction stage converts six molecules of 3-PGA into six molecules of glyceraldehyde 3-phosphate. 2. Six molecules of both adenosine triphosphate and NADPH are used to do it. 3. That is one of each carrier per molecule converted. 4. Three more molecules of adenosine triphosphate are used later, in the regeneration reactions. 5. Answering nine adds the regeneration cost to the reduction cost, which the question does not ask for. 6. The reduction stage spends no extra NADPH beyond these six, so the two carriers are not used in equal totals overall. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 8 "Photosynthesis", section 8.3 Using Light Energy to Make Organic Molecules_