Lactic Acid

Lactic acid has similar actions to acetic acid. It has emollient, keratolytic and antiseptic properties. It is used topically in the treatment of skin, otic and vaginal disorders. Used together with salicylic acid in the treatment of corns and warts. Use in intravenous infusions and in haemodialysis and peritoneal dialysis. In combination with citric acid and potassium bitartrate it is used as a vaginal contraceptive. It is also used as a food preservative and cosmetic ingredient.

Lactic acid is a natural product of the anaerobic branch of glucose metabolism. It is naturally present in blood and breast milk and may increase during intense exercise ^{(Quinn 1999, Wallace 1991)}. It is produced and consumed naturally by infants.

Although some studies have suggested that infants reject milk containing high amounts of lactic acid ^{(Wallace 1992)}, it has been shown that such an increase is neither harmful nor does it affect infant feeding habits. ^{(Wright 2002)}

The small dose and low plasma absorption of most topical dermatological or vaginal preparations make passage of significant amounts into breast milk unlikely. When applied topically, lactic acid is minimally absorbed. ^{(Okuda 2011)}

Do not apply to the nipple or areola.

Expert authors consider it safe to use this medication during breastfeeding. ^{(Hale, LactMed)}