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.