Lactic Acid:

Lactic acid CH3CH(OH)CO2H is a white, water-soluble solid or clear liquid that is produced both naturally and synthetically. Lactic acid is choral, consisting of two optical isomers. One is known as L-(+)-lactic acid or (S)-lactic acid and the other, its mirror image, is D-(−)-lactic acid or (R)-lactic acid. A mixture of the two in equal amounts is called DL-lactic acid.

Lactic Acid USP Grade
Propanoic acid, 2-hydroxy-. Lactic acid [50-21-5].
Lactic Acid is a mixture of lactic acid (C3H6O3) and lactic acid lactate (C6H10O5) equivalent to a total of not less than 88.0 percent and not more than 92.0 percent, by weight, of C3H6O3. It is obtained by the lactic fermentation of sugars or is prepared synthetically. Lactic Acid obtained by fermentation of sugars is levorotatory, while that prepared synthetically is racemic. [NOTE—Lactic Acid prepared by fermentation becomes dextrorotatory on dilution, which hydrolyzes L-( )-lactic acid lactate to L-(+)-lactic acid.]

Labeling: Label it to indicate whether it is levorotatory or racemic.