Some organisms, such as some bacteria, will undergo lactate fermentation. Two pyruvates are converted to two lactic acid molecules, which ionize to form lactate. In this process two NADH + H+ are converted to two NAD+. Our muscle cells can undergo this process when they are in oxygen debt.
Beside this, can humans do fermentation?
In such situations, your muscle cells use another process, called fermentation, that makes ATP without using oxygen. Cellular respiration still continues, but it is not the main source of ATP while fermentation is occurring.
What are the products of fermentation in humans?
Sugars are the most common substrate of fermentation, and typical examples of fermentation products are ethanol, lactic acid, carbon dioxide, and hydrogen gas (H2). However, more exotic compounds can be produced by fermentation, such as butyric acid and acetone.