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Para Aminobenzoic acid (also known as para-aminobenzoic acid or PABA because the number 4 carbon in the benzene ring is also known as the para position) is an organic compound with the formula H2NC6H4CO2H. PABA is a white solid, although commercial samples can appear gray. It is slightly soluble in water. It consists of a benzene ring substituted with amino and carboxyl groups. The compound occurs extensively in the natural world.
White or Off- White Crystal or Crystalline Powder
Effective for Sunburn: PABA is approved by the U.S. Food and Drug Administration (FDA) for use as a sunscreen. PABA seems to work even when a person is sweating, but not when the skin is under water, such as when swimming.
Possibly Effective for Peyronie disease: PABA is FDA-approved for use in this condition.
Possibly Ineffective for Hardening of skin and connective tissue (scleroderma): Although PABA is FDA-approved for scleroderma, there is only limited evidence that it is effective. Not all research has shown benefit.
PABA is also used to treat infertility in women, arthritis, "tired blood" (anemia), rheumatic fever, constipation, systemic lupus erythematosus (SLE), and headaches. It is also used to darken gray hair, prevent hair loss, make skin look younger, and prevent sunburn.