Lactic Acid

Lactate.

Intermediate product in metabolism during degradation of sugar without oxygen (lactic fermentation).

It is a glycolytic hydrogenation product of pyruvic acid in the metabolism (blood values: 5-20 mg/dl; increased during muscle work).

https://de.wikipedia.org/wiki/Milchs%C3%A4ure _{(Wikipedia CC-by-sa-3.0)}