PABA, while less commonly used today, still poses significant risks to coral reefs when it enters marine environments. It disrupts coral cellular processes and can interfere with the photosynthetic activity of zooxanthellae, leading to bleaching. PABA and its derivatives have been shown to cause oxidative stress in coral tissues, damaging cellular structures and DNA. The chemical accumulates in marine sediments and organisms, where it can persist for extended periods. Studies indicate PABA affects the settlement and metamorphosis of coral larvae, reducing successful reef recruitment. It also demonstrates endocrine-disrupting properties in fish, affecting reproductive hormones and developmental processes.