PABA occurs naturally in such items as mushrooms, bran, wheat germ, eggs, liver, molasses, brewer’s yeast, and yogurt. Yet, the substance is also marketed as a health supplement despite the fact that most scientists do not believe it is an essential part of the human diet. Many health food stores and other distributors of PABA claim that it is an effective treatment for vitiligo, which is a condition that is associated with the discoloration of the skin, and also link the chemical with hair growth and a reversal of the graying of hair. Others claim that PABA can improve the protein used in the body and may be helpful in connective tissue disorders. Nevertheless, little, if any, scientific evidence supports such assertions.