This apple cider vinegar & Rosemary shampoo bar contains various vitamins and minerals, such as vitamin B-3, to promote healthy hair and scalp. The acidity of the apple cider vinegar helps to balance the skin’s pH as it cleanses. Its anti-fungal and anti-bacterial properties help combating scalp infections, dryness, itchiness and dandruff. 3. This shampoo bar can do wonders to your hair, retaining the pH level of your scalp and leaving you with soft, shiny and smooth hair.