Tylenol and Autism: Evidence, Scientific Blunders, and Medicine Gone Wrong by William Parker, PhD, is a provocative, evidence-focused investigation into the disputed "Tylenol autism link"--the hypothesis that acetaminophen (Tylenol/paracetamol/APAP) exposure can trigger autism spectrum disorder (ASD) in biologically susceptible babies and young children. Rather than relying on a single study, Parker organizes roughly 30 distinct lines of evidence across pharmacology and metabolism, human associations involving time/place/behavior, laboratory animal neurodevelopmental toxicity, and additional observations--then weighs that total body of evidence against alternative explanations and common objections. The book digs into proposed mechanisms (including early-life limits in detoxification pathways, oxidative stress-linked susceptibility, and gut-brain effects) and emphasizes "timing of risk" from pregnancy through labor/delivery and early childhood. Beyond the science, it examines the logic of the controversy--how statistical mistakes (such as misclassifying interacting variables as confounders), peer-review failures, and conflicts of interest can shape medical consensus. In Tylenol and Autism , Dr. Parker confronts, with intelligence, honesty, and bravery, what is an undeniably culturally and politically explosive issue intensified by the 2025 White House spotlight on acetaminophen and autism.