para-Aminobenzoic acid (PABA) is a chemical used in sunscreen that is an essential nutrient for some bacteria. It is sometimes called Vitamin B-x, although PABA is not essential for humans and it varies in its activity from other B vitamins. The chemical formula is (COOH)-Ph-NH2 / (C7H7NO2) also known as 4-Amino-benzoic acid and has the chemical structure: PABA is a white crystalline substance that is only slightly soluble in water.

GoldBamboo

... PARA-AMINOBENZOIC ACID (PABA) is a sunscreen that prevents sunburn and protects your skin from the harmful effects of the sun. Para-aminobenzoic acid is a chemical sunscreen which absorbs ultraviolet (UV) and visible sun light. Limiting exposure to the sun and using sunscreen agents can help prevent early wrinkling and skin cancer. Para-aminobenzoic acid is only available in combination with other sunscreen agents. Generic sunscreen lotions containing PABA are available. ...
Drug Digest - more...

4-Aminobenzoic acid General Systematic name 4-aminobenzoic acid O ...
Wikipedia - [full article]

Resources