Para-aminobenzoic acid, or PABA, is a naturally occurring, water-soluble non-protein amino acid, which is found in many foods (grains, eggs, milk, and meat) as a co-factor of the vitamin B complex (associated with folate). It has been used by some people to re-pigment the hair and was used in sunscreens for years because of its ability to absorb ultraviolet (UVB) light.238 As an antioxidant, PABA also provides protection against ozone, smoking, and other air pollutants which damage cell structures and membranes through oxidative stress.
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