p-Aminobenzoic acid is widely used as an intermediate in the synthesis of dyes, pharmaceuticals, and other organic compounds. It is also used as an ultraviolet (UV) absorbent in sunscreens, cosmetics and other personal care products to protect skin from harmful UV rays.In biological systems, p-aminobenzoic acid is a precursor to folic acid and plays a role in the metabolism of tyrosine, an amino acid. It is also involved in the biosynthesis of other important compounds like porphyrins, histamine, and melatonin.