Uses: This combination product is used to help restore and maintain the natural acid balance (pH) of the vagina, thereby treating vaginal infections (e.g., yeast, fungi) or making them less likely to occur. Acetic acid is commonly known as vinegar. Oxyquinoline and ricinoleic acid are substances added to help acetic acid work better. This product is thought to work by destroying or slowing the growth of organisms that cause vaginal infections.