Fermentation Alcohol fermentation.Produces ethyl alcohol CO2 Lactic acid fermentation.Produces lactic acid. Homolactic fermentation.Produces lactic acid only. Heterolactic fermentation.Produces lactic acid and other compounds.• Alcohol fermentation. Produces ethyl alcohol + CO2 • Lactic acid fermentation. Produces lactic acid. • Homolactic fermentation. Produces lactic acid only. • Heterolactic fermentation. Produces lactic acid and other compounds. Fermentation