News|HealthFact-checking RFK Jr’s false claim linking autism to circumcisionThe US health secretary’s claims are false, as research finds no clear connection between circumcision and autism.
## Overview of Circumcision and Autism Research
Overview of Circumcision and Autism Research
On Mon, Oct 9, 2025, claims were made by United States Health and Human Services Secretary regarding a potential link between autism and circumcision. However, experts indicate that these claims lack support from rigorous research.
Two studies, conducted in 2013 and 2015, were referenced concerning circumcision and autism rates. Both studies suggested some association but had significant limitations such as small sample sizes. The studies did not establish a causal link between circumcision and autism. Neither study provided data on the administration of acetaminophen, the active ingredient in Tylenol, to the subjects.
Further research has been recommended by the authors to confirm any potential relationship.
Acetaminophen is generally deemed safe for infants and children when used as directed by a healthcare professional. It is not universally recommended for circumcision pain management, as local anesthetics are typically used during the procedure.
The 2025 paper cited by Secretary Kennedy has not undergone peer review and is considered a preprint. It was authored by researchers from WPLab, a company advocating for a connection between acetaminophen and autism. The paper asserts evidence for acetaminophen's role in triggering autism, which is not aligned with the scientific consensus.
On Mon, Oct 9, 2025, claims were made by United States Health and Human Services Secretary regarding a potential link between autism and circumcision.
The 2013 study, conducted by UMass-Lowell epidemiologists, aimed to explore any potential association between acetaminophen use in infants and autism development. Notably, it was described as a "hypothesis generating exploratory analysis" without conclusive findings regarding causation.
The study examined circumcision as a proxy for acetaminophen administration but did not verify actual drug use in cited cases. Data was collected from nine countries, using circumcision rates and autism prevalence to calculate correlations, which were noted to have significant limitations.
The 2015 study in Denmark investigated whether circumcision increased the likelihood of an autism diagnosis before age 10. While it suggested a 46 to 62 percent increased risk, the study had several limitations:
Circumcision is rare in Denmark, primarily occurring in Jewish and Muslim families. The study only included hospital and doctor-reported circumcisions, excluding home religious ceremonies. Sample sizes for circumcised and autistic children were small, impacting the reliability of the findings.
The study did not examine acetaminophen use, yet it was cited in support of a link between the drug and autism, a stance not supported by scientific consensus.
Experts emphasize the necessity of considering various cultural, demographic, and other potential confounding variables when researching associations between risk factors and autism.
Based on reporting by Al Jazeera.