A substance which absorbs UV light, acting as a sunblock.
Para-aminobenzoic acid, a B-complex vitamin that is an essential metobolite. If an organism is deprived of PABA it will fail to reproduce, then die.
Para-Amino Benzoic Acid, can be natural or synthetic. Found in Vitamin B complex. Found in most sunscreens. It can cause allergic eczema and a sensitivity to light in susceptible people whose skin may react to sunlight by erupting with a rash, sloughing and or swelling. There are concerns that it could actually increase risk of cancer.