Maintenance of vaginal acidity

The **maintenance of vaginal acidity** refers to the biological process by which the vaginal environment is kept at a relatively acidic pH (typically 3.8–4.5) during a woman's reproductive years. This acidic environment is primarily generated through the metabolic activity of Lactobacillus species, which ferment glycogen (deposited in the vaginal epithelium in response to estrogen) into lactic acid[1][2][3][6][7]. Both D- and L-lactic acid forms are produced, with D-lactic acid (from *L. crispatus*, *L. jensenii*, *L. gasseri*) being particularly beneficial to vaginal health[5]. The lactic acid, alongside other metabolites like hydrogen peroxide and bacteriocins, inhibits the growth of pathogenic bacteria, yeasts, and sexually transmitted pathogens. Vaginal epithelial cells may also contribute to lactic acid production, though their contribution is less than that from bacteria[4][5][6]. The maintenance of a low pH is thus not the function of a single molecule or druggable target, but rather the result of a host-microbe interaction central to vaginal health and resistance to infection[2][3][6]. **Key points:** - "Maintenance of vaginal acidity" is a physiological state, not a molecular target. - The main effectors are Lactobacillus species and their metabolic products (mainly lactic acid)[2][3][6]. - No abbreviation, canonical gene, or protein name exists for this entry. - If looking for a molecular target in this context, "Lactobacillus acidophilus," "Lactobacillus crispatus," or "Lactic acid" (and their associated metabolic enzymes) are more specific entries.