* Lactic acid is the main acid found in sour milk and other fermented dairy products. It is also found in some fruits and vegetables, such as sauerkraut and yogurt.
* Lactic acid is used as a food preservative and flavoring agent. It is also used in the production of cosmetics, pharmaceuticals, and plastics.
* Lactic acid is an important intermediate in the metabolism of carbohydrates. It is produced by the breakdown of glucose in the absence of oxygen.
* Lactic acid is responsible for the burning sensation that is felt during intense exercise. It is produced by the muscles when they are working hard and do not have enough oxygen.
* Lactic acid can be used as a fuel by the body. It can be converted back into glucose or used to produce energy.
* Lactic acid is also involved in the regulation of the immune system. It can help to protect the body from infection.
