Figure 9.11 Fermentation Glycolysis produces pyruvate, ATP, and NADH from glucose. (A) Lactic acid fermentation uses NADH as a reducing agent to reduce pyruvate to lactate, thus regenerating NAD+ to keep glycolysis operating. (B) In alcoholic fermentation, pyruvate from glycolysis is converted into acetaldehyde, and CO2 is released. NADH from glycolysis is used to reduce acetaldehyde to ethanol, thus regenerating NAD+ to keep glycolysis operating.