C8 exposure linked to ADHD in children Children exposed to higher levels of C8 are at an increased risk of developing attention deficit hyperactivity disorder, according to a scientific paper published this week. The study, by researchers at Boston University and the Harvard School of Public Health, also found higher risks for children exposed to other similar perfluorinated chemicals. Attention deficit hyperactivity disorder, or ADHD, is one of the most common neuro-developmental disorders in children. Kids diagnosed with it are often inattentive, impulsive and hyperactive. C8 is another name for perfluorooctanoic acid, or PFOA. C8 and other PFCs have been widely used in nonstick coatings, stain-resistant fabrics and food package coatings.