Lactic acid exists in two forms: D(-)lactic acid and L(+)lactic acid. Only the D form is protective against infection by Chlamydia trachomatis. Both forms are produced by bacteria found in the vagina. Interactive versions of these molecules can be viewed at PubChem: D-lactic acid, L-lactic acid
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N. R. Gough, Antibiotic Treatment Reshapes the Vaginal Microbiome. BioSerendipity (19 August 2019). https://www.bioserendipity.com/antibiotic-treatment-reshapes-the-vaginal-microbiome/