From Creatures Wikia
Lactate is a chemical in C2 and C3/DS. It is created from pyruvate, a byproduct of glucose digestion, when there is not enough oxygen in the norn's bloodstream. In C2, when a norn stops drowning, the lactate is then converted back into pyruvate. In C3, however, despite being labelled 'Neutral' in the C3 chemical list, it has no way of being removed from the body, and it damages the Muscle Tissue.
- Lactate Cure? - more information on how to gengineer a lactate oxidation gene.